Schneider Electric SoHVAC User Guide

SoHVAC
EIO0000000663 05/2014
SoHVAC
HVAC&R Function Library
User Guide
EIO0000000663.02
05/2014
www.schneider-electric.com
The information provided in this documentation contains general descriptions and/or technical
characteristics of the performance of the products contained herein. This documentation is not
intended as a substitute for and is not to be used for determining suitability or reliability of these
products for specific user applications. It is the duty of any such user or integrator to perform the
appropriate and complete risk analysis, evaluation and testing of the products with respect to the
relevant specific application or use thereof. Neither Schneider Electric nor any of its affiliates or
subsidiaries shall be responsible or liable for misuse of the information contained herein. If you
have any suggestions for improvements or amendments or have found errors in this publication,
please notify us.
No part of this document may be reproduced in any form or by any means, electronic or
mechanical, including photocopying, without express written permission of Schneider Electric.
All pertinent state, regional, and local safety regulations must be observed when installing and
using this product. For reasons of safety and to help ensure compliance with documented system
data, only the manufacturer should perform repairs to components.
When devices are used for applications with technical safety requirements, the relevant
instructions must be followed.
Failure to use Schneider Electric software or approved software with our hardware products may
result in injury, harm, or improper operating results.
Failure to observe this information can result in injury or equipment damage.
© 2014 Schneider Electric. All rights reserved.
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Table of Contents
Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About the Book. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part I HVAC&R System Requirements . . . . . . . . . . . . . .
Chapter 1 System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . .
System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Part II HVAC&R Function Blocks . . . . . . . . . . . . . . . . . . .
Chapter 2 AHU Temperature Control Strategy:
AHUTempCntrlStrategy . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Function Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AHUTempCntrlStrategy Function Block . . . . . . . . . . . . . . . . . . . . .
2.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3 AHU Plant Mode Strategy: AHUPlantModeStrategy . .
3.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Function Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AHUPlantModeStrategy Function Block . . . . . . . . . . . . . . . . . . . . .
3.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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3.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4 ATV Modbus Communication:
ATV••ModbusCom / ATV••• ModbusCom . . . . . . . . . . .
4.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Function Block Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ATV••/•••ModbusCom Function Block . . . . . . . . . . . . . . . . . . . . . . .
4.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 5 Compressor Management: CompMgmt . . . . . . . . . . . .
5.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Function Block Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompMgmt Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 6 Fan Management: FanMgmt . . . . . . . . . . . . . . . . . . . . .
6.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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6.3 Function Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FanMgmt Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 7 Floating High Pressure Control:
FloatingHighPresCntrl . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.3 Function Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FloatingHighPresCntrl Function Block. . . . . . . . . . . . . . . . . . . .
7.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 8 Floating Setpoint: FloatingSetpoint . . . . . . . . . . . . . . .
8.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.3 Function Block Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FloatingSetpoint Function Block . . . . . . . . . . . . . . . . . . . . . . . . .
8.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 9 Water Temperature Deadband Control:
WtrTempDbCntrl . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.1 Functional and Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Machine Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.2 Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hardware Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Software Architecture. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3 Function Block Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WtrTempDbCntrl Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . .
Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.4 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.5 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 10 Thermal Power Calculation:
ThermalPowerCalculation . . . . . . . . . . . . . . . . . . . . . . .
10.1 Function Block Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ThermalPowerCalculation Function Block Description . . . . . . . .
10.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 11 Coefficient of Performance Calculation:
COPCalculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COPCalculation Function Block Description . . . . . . . . . . . . . . . . . .
11.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 12 Totalizer for Digital Input Pulses: Pulse2Counter. . . .
12.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pulse2Counter Function Block Description . . . . . . . . . . . . . . . . . . .
12.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 13 Transform Counted Values to Energy:
Counter2Energy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Counter2Energy Function Block Description . . . . . . . . . . . . . . . . . .
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13.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 14 Energy Meter Data Trend: EnergyTrend. . . . . . . . . . . .
14.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EnergyTrend Function Block Description . . . . . . . . . . . . . . . . . . . . .
14.2 Pin Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 15 Energy Meter Modbus Communication Module:
EnergyMeterModbusCom . . . . . . . . . . . . . . . . . . . . . . .
15.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EnergyMeterModbusCom Function Block Description . . . . . . . . . . .
15.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 16 Float to Long Converter: Float2Long . . . . . . . . . . . . . .
16.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Float2Long Function Block Description . . . . . . . . . . . . . . . . . . . . . .
16.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 17 PID Control Function Block: PIDAdvanced . . . . . . . . .
17.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIDAdvanced Function Block Description . . . . . . . . . . . . . . . . . . . . .
17.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 18 Compressor Control for Screw Compressor with
Slider Capacity: CompCntrl_Slider. . . . . . . . . . . . . . . .
18.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompCntrl_Slider Function Block Description. . . . . . . . . . . . . . . .
18.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 19 Compressor Control for Generic On/Off
Compressors: CompCntrl_OnOff . . . . . . . . . . . . . . . . .
19.1 Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompCntrl_OnOff Function Block Description. . . . . . . . . . . . . . . . .
19.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Chapter 20 Compressor Control for Variable Speed
Compressors: CompCntrl_VS . . . . . . . . . . . . . . . . . . .
20.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompCntrl_VS Function Block Description . . . . . . . . . . . . . . . . . . . .
20.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 21 Compressor Alarm Management: CompAlarmMgmt .
21.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CompAlarmMgmt Function Block Description . . . . . . . . . . . . . . . . . . .
21.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 22 PID Autotuning: PIDAutoTuning. . . . . . . . . . . . . . . . . .
22.1 Functional Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PIDAutoTuning Function Block Description . . . . . . . . . . . . . . . . . . .
22.2 Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
269
270
270
272
273
281
282
282
283
284
299
300
300
303
303
313
317
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Safety Information
Important Information
NOTICE
Read these instructions carefully, and look at the equipment to become familiar with the device
before trying to install, operate, or maintain it. The following special messages may appear
throughout this documentation or on the equipment to warn of potential hazards or to call attention
to information that clarifies or simplifies a procedure.
EIO0000000663 05/2014
9
PLEASE NOTE
Electrical equipment should be installed, operated, serviced, and maintained only by qualified
personnel. No responsibility is assumed by Schneider Electric for any consequences arising out of
the use of this material.
A qualified person is one who has skills and knowledge related to the construction and operation
of electrical equipment and its installation, and has received safety training to recognize and avoid
the hazards involved.
BEFORE YOU BEGIN
Do not use this product on machinery lacking effective point-of-operation guarding. Lack of
effective point-of-operation guarding on a machine can result in serious injury to the operator of
that machine.
WARNING
UNGUARDED EQUIPMENT


Do not use this software and related automation equipment on equipment which does not have
point-of-operation protection.
Do not reach into machinery during operation.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
This automation equipment and related software is used to control a variety of industrial processes.
The type or model of automation equipment suitable for each application will vary depending on
factors such as the control function required, degree of protection required, production methods,
unusual conditions, government regulations, etc. In some applications, more than one processor
may be required, as when backup redundancy is needed.
Only you, the user, machine builder or system integrator can be aware of all the conditions and
factors present during setup, operation, and maintenance of the machine and, therefore, can
determine the automation equipment and the related safeties and interlocks which can be properly
used. When selecting automation and control equipment and related software for a particular
application, you should refer to the applicable local and national standards and regulations. The
National Safety Council’s Accident Prevention Manual (nationally recognized in the United States
of America) also provides much useful information.
In some applications, such as packaging machinery, additional operator protection such as pointof-operation guarding must be provided. This is necessary if the operator’s hands and other parts
of the body are free to enter the pinch points or other hazardous areas and serious injury can occur.
Software products alone cannot protect an operator from injury. For this reason the software
cannot be substituted for or take the place of point-of-operation protection.
10
EIO0000000663 05/2014
Ensure that appropriate safeties and mechanical/electrical interlocks related to point-of-operation
protection have been installed and are operational before placing the equipment into service. All
interlocks and safeties related to point-of-operation protection must be coordinated with the related
automation equipment and software programming.
NOTE: Coordination of safeties and mechanical/electrical interlocks for point-of-operation
protection is outside the scope of the Function Block Library, System User Guide, or other
implementation referenced in this documentation.
START-UP AND TEST
Before using electrical control and automation equipment for regular operation after installation,
the system should be given a start-up test by qualified personnel to verify correct operation of the
equipment. It is important that arrangements for such a check be made and that enough time is
allowed to perform complete and satisfactory testing.
CAUTION
EQUIPMENT OPERATION HAZARD



Verify that all installation and set up procedures have been completed.
Before operational tests are performed, remove all blocks or other temporary holding means
used for shipment from all component devices.
Remove tools, meters, and debris from equipment.
Failure to follow these instructions can result in injury or equipment damage.
Follow all start-up tests recommended in the equipment documentation. Store all equipment
documentation for future references.
Software testing must be done in both simulated and real environments.
Verify that the completed system is free from all short circuits and temporary grounds that are not
installed according to local regulations (according to the National Electrical Code in the U.S.A, for
instance). If high-potential voltage testing is necessary, follow recommendations in equipment
documentation to prevent accidental equipment damage.
Before energizing equipment:
Remove tools, meters, and debris from equipment.
 Close the equipment enclosure door.
 Remove all temporary grounds from incoming power lines.
 Perform all start-up tests recommended by the manufacturer.

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11
OPERATION AND ADJUSTMENTS
The following precautions are from the NEMA Standards Publication ICS 7.1-1995 (English
version prevails):
 Regardless of the care exercised in the design and manufacture of equipment or in the selection
and ratings of components, there are hazards that can be encountered if such equipment is
improperly operated.
 It is sometimes possible to misadjust the equipment and thus produce unsatisfactory or unsafe
operation. Always use the manufacturer’s instructions as a guide for functional adjustments.
Personnel who have access to these adjustments should be familiar with the equipment
manufacturer’s instructions and the machinery used with the electrical equipment.
 Only those operational adjustments actually required by the operator should be accessible to
the operator. Access to other controls should be restricted to prevent unauthorized changes in
operating characteristics.
12
EIO0000000663 05/2014
About the Book
At a Glance
Document Scope
This document describes the functions of the HVAC&R Function Library.
Validity Note
This document is valid for SoHVAC 3.0.
Related Documents
Title of Documentation
Reference Number
Modicon M168 Controller Hardware Guide
EIO0000000533 (Eng)
SoHVAC Software User Guide
EIO0000000537 (Eng)
SoHVAC Standard Library User Guide
EIO0000000538 (Eng)
You can download these technical publications and other technical information from our website
at www.schneider-electric.com.
Product Related Information
WARNING
LOSS OF CONTROL





The designer of any control scheme must consider the potential failure modes of control paths
and, for certain critical control functions, provide a means to achieve a safe state during and
after a path failure. Examples of critical control functions are emergency stop and overtravel
stop, power outage and restart.
Separate or redundant control paths must be provided for critical control functions.
System control paths may include communication links. Consideration must be given to the
implications of unanticipated transmission delays or failures of the link.
Observe all accident prevention regulations and local safety guidelines.1
Each implementation of this equipment must be individually and thoroughly tested for proper
operation before being placed into service.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
EIO0000000663 05/2014
13
1
For additional information, refer to NEMA ICS 1.1 (latest edition), "Safety Guidelines for the
Application, Installation, and Maintenance of Solid State Control" and to NEMA ICS 7.1 (latest
edition), "Safety Standards for Construction and Guide for Selection, Installation and Operation of
Adjustable-Speed Drive Systems" or their equivalent governing your particular location.
WARNING
UNINTENDED EQUIPMENT OPERATION


Only use software approved by Schneider Electric for use with this equipment.
Update your application program every time you change the physical hardware configuration.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
14
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SoHVAC
System Requirements
EIO0000000663 05/2014
Part I
HVAC&R System Requirements
HVAC&R System Requirements
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15
System Requirements
16
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SoHVAC
System Requirements
EIO0000000663 05/2014
Chapter 1
System Requirements
System Requirements
System Requirements
Hardware Requirements
The function blocks described in this document are compatible with the M168 S-type logic
controller.
Communication Interface
Port
Protocol
Communicates between...
Serial port 1
Modbus slave
Modbus master devices like Magelis HMI
display and M168 logic controller
Serial port 2
Modbus master or
slave
Altivar VSD, TeSysU and M168 logic
controller
Expansion bus
Proprietary protocol
based on CAN
M168 controller, I/O expansion boards,
HMI display and various auxiliary boards
User Interface
The parameters can be supplied and modified using the built-in display or using remote display
TM168GDB or TM168GDTS.
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17
System Requirements
18
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SoHVAC
HVAC&R Function Blocks
EIO0000000663 05/2014
Part II
HVAC&R Function Blocks
HVAC&R Function Blocks
What Is in This Part?
This part contains the following chapters:
Chapter
Chapter Name
Page
2
AHU Temperature Control Strategy: AHUTempCntrlStrategy
21
3
AHU Plant Mode Strategy: AHUPlantModeStrategy
51
4
ATV Modbus Communication: ATV••ModbusCom / ATV••• ModbusCom
73
5
Compressor Management: CompMgmt
89
6
Fan Management: FanMgmt
113
7
Floating High Pressure Control: FloatingHighPresCntrl
141
8
Floating Setpoint: FloatingSetpoint
163
9
Water Temperature Deadband Control: WtrTempDbCntrl
179
10
Thermal Power Calculation: ThermalPowerCalculation
201
11
Coefficient of Performance Calculation: COPCalculation
207
12
Totalizer for Digital Input Pulses: Pulse2Counter
211
13
Transform Counted Values to Energy: Counter2Energy
217
14
Energy Meter Data Trend: EnergyTrend
221
15
Energy Meter Modbus Communication Module: EnergyMeterModbusCom
227
16
Float to Long Converter: Float2Long
233
17
PID Control Function Block: PIDAdvanced
239
18
Compressor Control for Screw Compressor with Slider Capacity:
CompCntrl_Slider
251
19
Compressor Control for Generic On/Off Compressors: CompCntrl_OnOff
263
20
Compressor Control for Variable Speed Compressors: CompCntrl_VS
269
21
Compressor Alarm Management: CompAlarmMgmt
281
22
PID Autotuning: PIDAutoTuning
299
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19
HVAC&R Function Blocks
20
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SoHVAC
AHUTempCntrlStrategy
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Chapter 2
AHU Temperature Control Strategy: AHUTempCntrlStrategy
AHU Temperature Control Strategy:
AHUTempCntrlStrategy
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
2.1
Functional and Machine Overview
22
2.2
Architecture
26
2.3
Function Block Description
29
2.4
Pin Description
36
2.5
Troubleshooting
49
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21
AHUTempCntrlStrategy
Section 2.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
22
Page
Functional Overview
23
Machine Overview
25
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AHUTempCntrlStrategy
Functional Overview
Functional Description
The AHUTempCntrlStrategy function block (Air Handling Unit Temperature Control Strategy) is
a control strategy function block.
This function block controls the discharge air temperature of an air handling unit by modulating:
heating coils
 cooling coils
 dampers
 fans

The function block AHUTempCntrlStrategy is used together with the function block
AHUPlantModeStrategy.
Why Use the AHUTempCntrlStrategy Function Block?
The AHUTempCntrlStrategy function block is used for the following purposes:
Purpose
Reduce energy consumption
Description
Reduce energy consumption by means of:
variable air flow
economizer control
summer compensation
winter compensation




Optimize operation
 increase control accuracy
 increase comfort levels
Features of the AHUTempCntrlStrategy Function Block
The AHUTempCntrlStrategy function block provides the following features:
Constant DAT (Discharge Air Temperature) control
 Return Air Compensated DAT control
 Fan Mode: variable and constant volume
 Cooling Mode: Modulating cooling coil/DX-cooling control
 Damper Mode: damper position controls air flow
 Sequential control of output signals: more than one actuator in series is controlled (damper,
heating coil, cooling coil, discharge air fan, return air fan)
 Winter compensation: increases discharge air temperature at low temperature
 Summer compensation: increases RAT (Return Air Temperature) setpoint at high outside
temperature
 Economizer function
 Freeze avoidance and freeze recovery

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AHUTempCntrlStrategy
Protective Features
The AHUTempCntrlStrategy function block provides the following protective features to help
you avoid the potentials of certain sources of machine malfunction:
24
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of
range data from being accepted directly.
Alarm/alert notification
If an invalid value is entered, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with
reduced performance
Controlled parameter
The configuration of these parameters can be changed,
however the changes are effective only after the restart of the
function block.
Several parameters are controlled. Please refer to the section
Parameter Description (see page 39).
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AHUTempCntrlStrategy
Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
AHUTempCntrlStrategy controls the discharge air temperature by sequencing fan speeds, heating coil,
dampers and cooling coil.
AHUPlantModeStrategy is connected to the AHUTempCntrlStrategy and controls the operation modes
of the Air Handling Unit.
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25
AHUTempCntrlStrategy
Section 2.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
26
Page
Hardware Architecture
27
Software Architecture
28
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AHUTempCntrlStrategy
Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture of Air Handling Unit.
1
2
3
4
5
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Motor control
EIO0000000663 05/2014
27
AHUTempCntrlStrategy
Software Architecture
Function Block Diagram
The following function block diagram provides an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables, on the right
hand side the outputs, the Process Commands, as well as the function block
AHUTempCntrlStrategy.
The following table provides an overview of the functions of AHUTempCntrlStrategy:
Function
Description
Setpoint
calculates the DAT setpoint based on OAT, RAT, winter compensation and
freeze avoidance function.
PID
 provides a control output by calculating the deviation between the actual
DAT and the DAT setpoint.
used to sequence
fan speed
heating coil
dampers
cooling coils
 is




Sequencer
28
modulates control signals for fan speed, heating coil, cooling coils and
dampers depending on the PID output.
EIO0000000663 05/2014
AHUTempCntrlStrategy
Section 2.3
Function Block Description
Function Block Description
AHUTempCntrlStrategy Function Block
Function Block Description
The AHUTempCntrlStrategy function block is a control strategy function block that regulates
the temperature by controlling cooling coils, heating coils, dampers and fans.
AHUTempCntrlStrategy provides the following methods for temperature control:
Constant DAT control
 RAT Compensated DAT control
 Sequential control of output signals
 Winter compensation of Discharge Air Temperature
 Summer compensation on Return Air Temperature
 Damper control and Fan Control
 Cooling mode: supports both chilled water cooling coils and direct expansion cooling
(DX cooling)
 Economizer function
 Freeze avoidance and freeze avoidance recovery control

NOTE: This function block is to be used together with the AHUTempCntrlStrategy function
block.
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AHUTempCntrlStrategy
Constant DAT Control and Compensated DAT Control
The following table provides an overview of Constant and Compensated DAT control:
Mode
Description
Constant DAT Control
Discharge Air Temperature is kept constant as set by input setpoint.
 ControlMode=0
 uses the DAT sensor to provide PID-control on the DAT.
 uses the following parameters:
ControlMode
Pb
Ti
Td
Compensated DAT
Control
 room / exhaust air compensated Discharge Air Temperature control
(master-slave control)
 ControlMode=1
 requires the RAT sensor; in case the RAT sensor is not available or when
the sensor is in alarm, control will change to Constant DAT Control
 provides the possibility of P-control on the compensated DAT setpoint and
PID control on the DAT
 for this function, it is necessary to connect a RAT sensor to the function
block
 uses the following parameters:
ControlMode
Pb_ReturnAirControl
DischargeAirTempMin
DischargeAirTempMax
Pb
Ti
Td
Both control modes sequence output signals for heating, for mixed air dampers, fans and for
cooling.
The following graphic shows the Compensated DAT control. The DAT setpoint varies between the
minimum and maximum DAT setpoint, depending on the deviation on the RAT.
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AHUTempCntrlStrategy
Sequential Control of Output Signals
The sequencer controls more than one actuator in series. One actuator is controlled until the end
of range before the next actuator is used.
The PID control is diverted over multiple actuators. The user can define the order and the
percentage of the PID control signal for each actuator.
The sequencing of the output control signals is defined in the AHUTempCntrlStrategy function
block for the actuators
 heater
 damper
 fan
 cooler
The start and end points of each output signal can be configured for each air handling unit using
the parameters from FanSeqStart1...FanSeqStop2.
The following figure shows an example of sequencing Fans, Heating coil, Dampers, Cooling coil
and Fans:
P1 FanSeqStart1
P2 FanSeqStop1
P3 HeatingSeqStart
P4 HeatingSeqStop
P5 DamperSeqStart
P6 DamperSeqStop
P7 CoolingSeqStart
P8 CoolingSeqStop
P9 FanSeqStart2
P10 FanSeqStop2
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AHUTempCntrlStrategy
Winter and Summer Compensation
The following table provides an overview of winter and summer compensation:
Mode
Winter Compensation
Description
Winter compensation of Discharge Air Temperature:
 DAT setpoint increases at low outside temperature and hence increases
the comfort level
 winter compensation is disabled if the OAT sensor is inoperable
Summer Compensation
32
Summer compensation on Return Air Temperature
 RAT setpoint increases at high Outside Air Temperature
 results in higher room temperature and thus avoids climate shocks and
reduces energy consumption
 is disabled if the OAT sensor is inoperable
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AHUTempCntrlStrategy
Damper Control and Fan Control
The damper position and the fan speed control the air flow.
NOTICE
INOPERABLE AIR HANDLING UNIT


Make sure that the open/close dampers are opened before starting fans.
Make sure that the parameter damper actuator run time is set to the actuator run time of the
device.
Failure to follow these instructions can result in equipment damage.
NOTE: A damper end switch indicates whether the dampers are fully opened.
The AHUTempCntrlStrategy function block allows configuring the following types:
Type
Description
Modulating dampers
 output varies between 0 - 100%
 DamperMode= 0
 Economizer mode possible
Open / Close dampers




ON / OFF (output is 0 or 100%)
DamperMode= 1
Fans start operating, when the dampers are fully open.
DamperActuatorRuntime defines the time for the
dampers to change from a close position to the open
position.
 Damper status is checked before starting fans. An alarm is
raised, when the dampers are not open within the damper
actuator run time.
Cooling Control
The function block supports cooling using chilled water or a refrigerant (DX direct expansion valve
control).
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AHUTempCntrlStrategy
Economizer Function
The built-in economizer function reduces the energy consumption
by closing the dampers in case of a high OAT
 by fully opening the dampers in case of heating mode

To save energy, the modulating damper control can be reversed or set to a minimum position.
If...
Then...
the Outside Air Temperature is higher than the modulating damper control is reversed:
Return Air Temperature
In cooling mode, the dampers are fully open.
In heating mode the dampers are fully closed.
the Outside Air Temperature exceeds the
the modulating damper control is set to a minimum.
value of EconomizerOutdoorAirTempMax,
The economizer function of the dampers can be enabled or disabled by means
of EconomizerMode. This function is disabled if the OAT or RAT sensors are inoperable.
Freeze Avoidance Recovery Control
NOTICE
BROKEN COIL


Make sure that a freeze stat is properly mounted on the hot water coil to prevent freezing.
In case of a freeze stat alarm, switch off the fans, close the dampers, open the heating coil
valve and start heating coil pump.
Failure to follow these instructions can result in equipment damage.
Freeze avoidance is activated when the outside air temperature is below the FreezeLimit for
PlantModes 1–5.
Freeze Recovery is activated after a Freeze Alarm for PlantMode 21.
Freeze Recovery is applicable only for modulating dampers. This function is disabled
for Open/Close damper.
Following actions are executed when freeze avoidance is active with input PlantMode (21):
 Dampers and cooling valve are closed
 Fans are switched Off
 Output HeatingControlSignal is set to maximum value of 100%
When freeze alarm is reset a start-up procedure executes for restarting the air-handling unit.
In case of restarting a unit, the DAT setpoint is temporarily increased. FreezeRecoveryIncr
immediately starts and slowly ramps down to its normal setpoint.
34
EIO0000000663 05/2014
AHUTempCntrlStrategy
The following parameters are used in the freeze avoidance feature:
 FreezeLimit
 FreezeRecoveryIncr
 FreezeRecoveryDur
Plant Mode
The PlantMode signal from the function block AHUPlantModeStrategy indicates the operation
mode for the air handling unit.
Plant Mode supports following operation modes:
Plant Mode
Description
0
AHU Off
2
Night cycle
3
Night Purge
4
Occupied operation
5
Extended operation
11
AHU Off Delayed Mode
21
Freeze alarm
22
Fan alarm
23
Fire alarm
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35
AHUTempCntrlStrategy
Section 2.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
36
Page
Input Pin Description
37
Output Pin Description
44
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AHUTempCntrlStrategy
Input Pin Description
Pin Diagram
The following graphic shows the pin diagram of AHUTempCntrlStrategy.
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37
AHUTempCntrlStrategy
Input Pin Description
Input
Data Type
Range
Scaling/Unit
Description
EnableIn
CJ_BIT
TRUE or FALSE
N/A
TRUE: Enables the function block.
FALSE: Disables the function block.
The outputs including the Alert and
Alarm outputs are set to 0.
DischargeAirTemp
CJ_ANALOG
N/A
0.1° C/° F
Discharge air temperature.
The alarm due to this input sets the
following outputs to 0:
 HeatingControlSignal
 DamperControlSignal
 CoolingControlSignal
 FanControlSignal
ReturnAirTemp
CJ_ANALOG
N/A
0.1° C/° F
Return air temperature (optional).
Refer also to the description for
ReturnAirTemp below this table.
OutdoorAirTemp
CJ_ANALOG
N/A
0.1° C/° F
Outdoor air temperature.
When this input indicates a missing
or a short circuit sensor alarm, the
function block disables the following
functions:
 Summer compensation
 Winter compensation
 Economizer function
Setp
CJ_SHORT
–32768...32767
0.1° C/° F
Setpoint
DamperEndswitch
CJ_BIT
TRUE or FALSE
N/A
Damper open
TRUE: Damper open (default)
FALSE: Damper close
PlantMode
CJ_BYTE
0...23
1
Refer Plant Mode (see page 35).
ReturnAirTemp
If this input is not connected, the function block does not generate an analog channel alarm and
operates in the Constant DAT control regardless of the ControlMode input.
The following functions are disabled if this input is not connected to the function block:
Summer compensation
 Compensated DAT control
 Return air temperature sensor range checks
 Return air temperature short circuit alarm
 Return air temperature missing alarm
 Economizer mode

38
EIO0000000663 05/2014
AHUTempCntrlStrategy
Parameter Description
Parameters like FanSeqStart1, FanSeqStop1, HeatingSeqStart, HeatingSeqStop,
DamperSeqStart, DamperSeqStop, CoolingSeqStart, CoolingSeqStop,
FanSeqStart2, FanSeqStop2, DamperMode, EconomizerMode, CoolingMode, CoolingNbStages, FanMode, FreezeRecoveryIncr, FreezeRecoveryDur are controlled parameters.
Controlled parameters can be changed, however the changes only become effective after a reset
of the function block.
Parameter
Data Type
Range
Scaling/
Unit
Description
ControlMode
CJ_BYTE
0 and 1
N/A
Control mode
1 Return air temperature
compensated DAT
0 Constant DAT
Default: 0
Pb_ReturnAirControl
CJ_WORD
1...500
0.1° C/° F
Pb RAT control
Default: 40
DischargeAirTempMin
CJ_SHORT
–580...3020
0.1° C/° F
Minimum DAT Setpoint
Default:160
DischargeAirTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Maximum DAT Setpoint
Default: 260
HeatingLimit
CJ_SHORT
–580...3020
0.1° C/° F
OAT limit heating closed
Default: 200
CoolingLimit
CJ_SHORT
–580...3020
0.1° C/° F
OAT limit cooling closed
Default: 140
WinterCompOutsideAirTempMin
CJ_SHORT
–580...3020
0.1° C/° F
Winter compensation
OAT low
Default: –100
WinterCompOutsideAirTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Winter compensation
OAT high
Default: 100
WinterCompOutsideAirTempOffset
CJ_SHORT
0... 200
0.1° C/° F
Winter compensation
OAT offset
Default: 40
SummerCompOutsideAirTempMin
CJ_SHORT
–580...3020
0.1° C/° F
Summer compensation
OAT low
Default: 200
SummerCompOutsideAirTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Summer compensation
OAT high
Default: 300
SummerCompOutsideAirTempOffset
CJ_SHORT
0... 200
0.1° C/° F
Summer compensation
OAT offset
Default: 40
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AHUTempCntrlStrategy
Parameter
Data Type
Range
Scaling/
Unit
Description
Pb
CJ_WORD
1... 500
0.1
Pb DAT control
Default: 60
Ti
CJ_WORD
0...3600
1sec
Ti DAT control
Default: 0
Td
CJ_WORD
0...3600
1sec
Td DAT control
Default: 0
FanSeqStart1
CJ_WORD
0...1000
0.1%
FCS startpoint 1
Default: 0
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FanSeqStop1
CJ_WORD
0...1000
0.1%
FCS endpoint 1
Default: 200
Controlled parameter.
Changes only become
effective after a reset of
the function block.
HeatingSeqStart
CJ_WORD
0...1000
0.1%
HCS startpoint
Default: 200
Controlled parameter.
Changes only become
effective after a reset of
the function block.
HeatingSeqStop
CJ_WORD
0...1000
0.1%
HCS endpoint
Default: 400
Controlled parameter.
Changes only become
effective after a reset of
the function block.
DamperSeqStart
CJ_WORD
0...1000
0.1%
DCS startpoint
Default: 400
Controlled parameter.
Changes only become
effective after a reset of
the function block.
DamperSeqStop
CJ_WORD
0...1000
0.1%
DCS endpoint
Default: 600
Controlled parameter.
Changes only become
effective after a reset of
the function block.
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AHUTempCntrlStrategy
Parameter
Data Type
Range
Scaling/
Unit
Description
CoolingSeqStart
CJ_WORD
0...1000
0.1%
CCS startpoint
Default: 600
Controlled parameter.
Changes only become
effective after a reset of
the function block.
CoolingSeqStop
CJ_WORD
0...1000
0.1%
CCS endpoint
Default: 800
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FanSeqStart2
CJ_WORD
0...1000
0.1%
FCS startpoint 2
Default: 800
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FanSeqStop2
CJ_WORD
0...1000
0.1%
FCS endpoint 2
Default: 1000
Controlled parameter.
Changes only become
effective after a reset of
the function block.
DamperMode
CJ_BYTE
0 and 1
N/A
Mode dampers
1 Open-close
0 Modulating
Default: 0
Controlled parameter.
Changes only become
effective after a reset of
the function block.
DamperActuatorRuntime
CJ_WORD
0... 300
sec
Damper runtime
Minimum delay to start
Default: 150
DamperMinPosition
CJ_WORD
0...1000
0.1%
Minimum damper position
Default: 200
MinFanFrequency
CJ_WORD
0...1000
0.1Hz
Minimum frequency FCS
Default: 200
MaxFanFrequency
CJ_WORD
0... 2000
0.1Hz
Maximum frequency FCS
Default: 500
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AHUTempCntrlStrategy
Parameter
Data Type
Range
Scaling/
Unit
Description
EconomizerMode
CJ_BIT
TRUE or
FALSE
N/A
Economizer mode
TRUE On
FALSE Off
Default: TRUE
Controlled parameter.
Changes only become
effective after a reset of
the function block.
EconomizerDiff
CJ_SHORT
1...100
0.1° C/° F
Economizer difference
Default: 20
EconomizerOutdoorAirTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Maximum OAT
economizer mode
Default: 300
CoolingMode
CJ_BYTE
0 and 1
N/A
Cooling mode
1 DX
0 Modulating
Default: 0
Controlled parameter.
Changes only become
effective after a reset of
the function block.
CoolingNbStages
CJ_BYTE
0...8
N/A
Cooling DX number of
stages
Default: 0
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FanMode
CJ_BYTE
0 and 1
N/A
Fan mode
0 variable speed based
on DAT
1 variable speed based
on RAT
2 1 Stage
Default: 0
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FreezeLimit
42
CJ_SHORT
–580... 3020
0.1° C/° F
OAT limit frost protection
Default: 60
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Parameter
Data Type
Range
Scaling/
Unit
Description
FreezeRecoveryIncr
CJ_SHORT
0... 500
0.1° C/° F
Freeze recovery DAT
step increase
Default: 100
Controlled parameter.
Changes only become
effective after a reset of
the function block.
FreezeRecoveryDur
CJ_WORD
0...1200
sec
Freeze recovery duration
Default: 600
Controlled parameter.
Changes only become
effective after a reset of
the function block.
DischargeAirTempMaxLimit
CJ_SHORT
–580... 3020
0.1° C/° F
DAT maximum
temperature
Default: 400
DischargeAirTempMinLimit
CJ_SHORT
–580... 3020
0.1° C/° F
DAT minimum
temperature
Default: 120
ReturnAirTempMaxLimit
CJ_SHORT
–580... 3020
0.1° C/° F
RAT maximum
temperature
Default: 400
ReturnAirTempMinLimit
CJ_SHORT
–580... 3020
0.1° C/° F
RAT minimum
temperature
Default: 120
NOTE:


A valid parameter input resets an alarm or alert automatically.
A constant hysteresis of 10 is considered wherever the analog input channel is compared to a
limit.
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AHUTempCntrlStrategy
Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling/
Unit
Description
EnableOut
CJ_BIT
TRUE or FALSE
N/A
TRUE: Function block is enabled.
FALSE: Function block is
disabled.
DischargeAirTempSetp
CJ_SHORT
–32768...32767
0.1° C/° F
DAT setpoint
HeatingControlSignal
CJ_WORD
0...1000
0.1%
Heating coil signal
DamperControlSignal
CJ_WORD
0...1000
0.1%
Damper control signal
CoolingControlSignal
CJ_WORD
0...1000
0.1%
FanControlSignal
CJ_WORD
MinFanFrequency to 0.1Hz
MaxFanFrequency
Fan control signal
Alert
CJ_BIT
TRUE or FALSE
N/A
Alert
AlertID
CJ_WORD
0...255
N/A
Alert ID (see page 45)
Alarm
CJ_BIT
TRUE or FALSE
N/A
Alarm
AlarmID
CJ_WORD
0...7
N/A
Alarm ID (see page 48)
Output
Data Type
Range
Scaling/
Unit
Description
PIDOutput
CJ_WORD
0...1000
N/A
PID output
Version[2]
Array of N/A
2 CJ_BYTE
N/A
Version information of the
function block
Version[0] - Function block
version
Version[1] - Function block
revision
Cooling coil signal
Parameter Description
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Alert ID Description
The AlertID output represents a value between 0 and 255, whereby each bit represents an alert.
The bits and their description are described in the following table:
Alert Bit
Alert Cause
Effect
0
Invalid parameter range.
An alert is generated, when one of the following parameters is out of range.
(Pb_ReturnAirControl < 1 or Pb_ReturnAirControl > 500)
(DischargeAirTempMin < –580 or DischargeAirTempMin > 3020)
(DischargeAirTempMax < –580 or DischargeAirTempMax > 3020)
(HeatingLimit < –580 or HeatingLimit > 3020)
(CoolingLimit < –580 or CoolingLimit > 3020)
(WinterCompOutsideAirTempMin < –580 or
WinterCompOutsideAirTempMin >3020)
(WinterCompOutsideAirTempMax < –580 or
WinterCompOutsideAirTempMax > 3020)
(WinterCompOutsideAirTempOffset < 0 or
WinterCompOutsideAirTempOffset > 200)
(SummerCompOutsideAirTempMin < –580 or
SummerCompOutsideAirTempMin > 3020)
(SummerCompOutsideAirTempMax < –580 or
SummerCompOutsideAirTempMax > 3020)
(SummerCompOutsideAirTempOffset < 0 or
SummerCompOutsideAirTempOffset > 200)
(Pb < 1 or Pb > 500)
(Ti < 0 or Ti > 3600)
(Td < 0 or Td > 3600)
(FanSeqStart1 < 0 or FanSeqStart1 > 1000)
(FanSeqStop1 < 0 or FanSeqStop1 > 1000)
(HeatingSeqStart < 0 or HeatingSeqStart > 1000)
(HeatingSeqStop < 0 or HeatingSeqStop > 1000)
(DamperSeqStart < 0 or DamperSeqStart > 1000)
(DamperSeqStop < 0 or DamperSeqStop > 1000)
(CoolingSeqStart < 0 or CoolingSeqStart > 1000)
(CoolingSeqStop < 0 or CoolingSeqStop > 1000)
(FanSeqStart2 < 0 or FanSeqStart2 > 1000)
Function block
operates, however with
limited performance.
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AHUTempCntrlStrategy
Alert Bit
Alert Cause
0
(FanSeqStop2 < 0 or FanSeqStop2 > 1000)
(FanSeqStart1 ≥ FanSeqStop1)
(HeatingSeqStart ≥ HeatingSeqStop)
(DamperSeqStart ≥ DamperSeqStop)
(CoolingSeqStart ≥ CoolingSeqStop)
(FanSeqStart2 ≥ FanSeqStop2)
(DamperActuatorRuntime < 0 or DamperActuatorRuntime > 300)
(DamperMinPosition < 0 or DamperMinPosition > 1000)
(MinFanFrequency < 0 or MinFanFrequency > 1000)
(MaxFanFrequency < 0 or MaxFanFrequency > 1000)
(EconomizerDiff < 1 or EconomizerDiff > 100)
(EconomizerOutdoorAirTempMax < –580 or
EconomizerOutdoorAirTempMax > 3020)
(CoolingNbStages < 0 or CoolingNbStages > 8)
(FreezeLimit < –580 or FreezeLimit > 3020)
(FreezeRecoveryIncr < 0 or FreezeRecoveryIncr > 500)
(FreezeRecoveryDur < 0 or FreezeRecoveryDur > 1200)
(DischargeAirTempMaxLimit < –580 or
DischargeAirTempMaxLimit > 3020)
(DischargeAirTempMinLimit < –580 or
DischargeAirTempMinLimit > 3020)
(ReturnAirTempMaxLimit < –580 or ReturnAirTempMaxLimit > 3020)
(ReturnAirTempMinLimit < –580 or ReturnAirTempMinLimit > 3020)
(DischargeAirTempMin > DischargeAirTempMax
(WinterCompOutsideAirTempMin > WinterCompOutsideAirTempMax
(SummerCompOutsideAirTempMin > SummerCompOutsideAirTempMax
(DischargeAirTempMinLimit > DischargeAirTempMaxLimit
(ReturnAirTempMinLimit > ReturnAirTempMaxLimit)
(MinFanFrequency > MaxFanFrequency)
46
Effect
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AHUTempCntrlStrategy
Alert Bit
Alert Cause
1
Alert due to analog input channel for return air temperature ReturnAirTemp.  Function block
This alert is generated if the return air temperature sensor is not connected or
operates.
short-circuited.
 Temperature control
changes to constant
DAT control
 RAT compensated
DAT control is
disabled
 Summer
compensation is
disabled
 Default value is
initialized to this
input to differentiate
between a
disconnected
sensor and an actual
sensor detected
error.
2
Alert due to analog input channel for outdoor air temperature
OutdoorAirTemp.
 Function block
3
Alert when discharge air temperature exceeds maximum limit.
If DischargeAirTemp > DischargeAirTempMaxLimit, then this bit is
TRUE, Hysteresis = 10.
Alert for limited
performance
4
Alert when discharge air temperature is below minimum limit.
If DischargeAirTemp < DischargeAirTempMinLimit, then this bit is
TRUE, Hysteresis = 10.
Alert for limited
performance
5
Alert when return air temperature exceeds maximum limit.
If ReturnAirTemp > ReturnAirTempMaxLimit, then this bit is TRUE,
Hysteresis = 10.
Alert for limited
performance
6
Alert when return air temperature is below minimum limit.
If ReturnAirTemp < ReturnAirTempMinLimit, then this bit is TRUE,
Hysteresis = 10.
Alert for limited
performance
7
Alert due to improper DX cooling configuration.
If CoolingNbStages is set as 0 and DX stage mode is selected, this bit is
TRUE.
Alert for limited
performance
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Effect
operates, however
with limited
performance.
 Following functions
are disabled:
 Summer
compensation
 Winter
compensation
 Economizer
47
AHUTempCntrlStrategy
Alert Bit
Alert Cause
Effect
8
Present changes are
The change of a controlled parameter is not active. Changing a controlled
parameter requires a machine restart. The controlled configuration parameter not active. Function
block uses the
setting is effective only after restart of the function block.
previously set values.
AlarmID Description
The AlarmID output represents a value between 0 and 7, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
Effect
0
Invalid parameter value
An alarm is generated when one of the following parameters is out of
range:
(ControlMode < 0 or ControlMode > 1)
(DamperMode < 0 or DamperMode > 1)
(CoolingMode < 0 or CoolingMode > 1)
(FanMode < 0 or FanMode > 2)
Function block is disabled
and the outputs are set to 0.
1
Alarm due to discharge air temperature analog input
DischargeAirTemp. This alarm is generated when discharge air
temperature sensor is short-circuited or disconnected.
Function block is disabled
and the outputs are set to 0.
2
Dampers are not opened within damper actuator runtime
Function block is disabled
and the outputs are set to 0.
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Section 2.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm / Alert
Problem
Solution
AlarmID.0 TRUE
Invalid parameter value
Check the parameters against their ranges.
AlarmID.1 TRUE
Discharge air temperature sensor is
short-circuited or disconnected
Check if the discharge air temperature sensor is
connected to the controller.
AlarmID.2 TRUE
Dampers are not opened within the
actuator runtime
Check the damper end switch and the actuator run
time.
AlertID.0 TRUE
Invalid parameter value
Check the parameters against their ranges.
AlertID.1 TRUE
Return air temperature sensor is shortcircuited or disconnected
Check if the sensor is connected to the controller.
AlertID.2 TRUE
Outdoor air temperature sensor is shortcircuited or disconnected
AlertID.3 TRUE
Discharge air temperature exceeds
maximum limit.
AlertID.4 TRUE
Discharge air temperature is below the
minimum limit.
AlertID.5 TRUE
Return air temperature exceeds
maximum limit.
 Check, if the cooling valve is open.
 Check air flow and cold water production.
AlertID.6 TRUE
Return air temperature is below the
minimum limit.
 Check, if the heater valve is open.
 Check air flow and hot water production.
AlertID.7 TRUE
Improper configuration of DX cooling
Check, if the value of parameter
CoolingNbStages is greater than 0
AlertID.8 TRUE
Configuration parameters are changed
which requires the function block to
restart
Disable the function block and enable the function
block again
Heating valve is
closed
Outside air temperature >
HeatingLimit
Increase parameter HeatingLimit
Cooling valve is
closed
Outside air temperature <
CoolingLimit
Decrease parameter CoolingLimit
 Check, if the heater valve is closed and cooling
value is open.
 Check the cold water production.
Fans are not started Dampers must open before the fan starts  Open the dampers first in case of Open/Close
Damper control
 Start the fan after expiration of the damper
actuator run time
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AHUTempCntrlStrategy
Alarm / Alert
Problem
Solution
The outputs remain
at 0
Function block is disabled
 Enable the function block
 Check the PlantMode
Dampers are at
minimum position
Economizer function is active
Set the outside air temperature >
EconomizerOutdoorAirTempMax
Dampers are
working in reverse
direction.
Economizer function is active
Set the outside air temperature > ReturnAirTemp
Winter compensation is active
Discharge air
temperature setpoint
is high
Check outside air temperature and winter
compensation parameters
Freeze recovery/avoidance is active
Discharge air
temperature setpoint
is high
Check parameters for freeze recovery/avoidance
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AHUPlantModeStrategy
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Chapter 3
AHU Plant Mode Strategy: AHUPlantModeStrategy
AHU Plant Mode Strategy: AHUPlantModeStrategy
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
3.1
Functional and Machine Overview
52
3.2
Architecture
56
3.3
Function Block Description
59
3.4
Pin Description
64
3.5
Troubleshooting
71
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AHUPlantModeStrategy
Section 3.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
52
Page
Functional Overview
53
Machine Overview
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AHUPlantModeStrategy
Functional Overview
Functional Description
The AHUPlantModeStrategy function block is a control strategy function block and defines the
operation mode of the air handling unit. This function block is used in conjunction with the other air
handling unit function block AHUTempCntrlStrategy.
Why Use the AHUPlantModeStrategy Function Block?
The AHUPlantModeStrategy function block is used for the following purposes:
Purpose
Description
Improve comfort conditions
improve the comfort of occupants by means of scheduled
operation.
Reduce energy consumption
reduce energy consumption by means of the operating
modes:
 night cycle
 night purge
Handle alarm situations
 freeze alarm
 fan alarm
 fire alarm
Features of the AHUPlantModeStrategy Function Block
The AHUPlantModeStrategy function block provides the following features:
cools down the building with cool outdoor air during summer periods (when building is
unoccupied)
 the AHUPlantModeStrategy function block optimizes the AHU operation when the building is
occupied, at night times and in alarm situations (freeze and fan alarms)
 helps reduce cooling energy
 helps maintain consistent machine operation
 supports the following operating modes:
Night Cycle - The room temperature reduces (during heating season) or increases (during
cooling season) to reduce energy consumption during unoccupied periods.
Night Purge - The cool outside air is used to cool down the building during the night.



Power up initialization delay: the Plant mode will be initialized with 0.
It can change the value from 0 into the values 2, 3, 4 or 5 only once the InitializationDelay period has elapsed.
This feature can be disabled by entering the value 0 for the parameter
InitializationDelay.
The AHU is switched off after a delay.
This feature can be disabled by entering the value 0 for the parameter AHUOffDelay.
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AHUPlantModeStrategy
Protective Features
The AHUPlantModeStrategy function block provides the following protective features to help
you avoid the potentials of certain sources of machine malfunction:
54
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of
range data from being accepted directly.
Alarm/alert notification
If an invalid value is entered, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with
reduced performance
Controlled parameter
Parameters like NightpurgeTimeStart,
NightpurgeTimeStop are controlled.
The configuration of these parameters can be changed,
however the changes are effective only after the restart of the
function block.
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AHUPlantModeStrategy
Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
AHUTempCntrlStrategy controls the discharge air temperature by sequencing fan speeds, heating coil,
dampers and cooling coil.
AHUPlantModeStrategy is connected to the AHUTempCntrlStrategy and controls the operation modes
of the Air Handling Unit.
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55
AHUPlantModeStrategy
Section 3.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
56
Page
Hardware Architecture
57
Software Architecture
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AHUPlantModeStrategy
Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture of Air Handling Unit.
1
2
3
4
5
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Motor control
EIO0000000663 05/2014
57
AHUPlantModeStrategy
Software Architecture
Function Block Diagram
The following function block diagram gives you an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables, on the right
hand side the outputs, the Process Commands, as well as the function block
AHUPlantModeStrategy:
The following table gives you an overview of the functions of AHUPlantModeStrategy
58
Function
Description
Decision Matrix
Sets plant modes depending on input and parameters.
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AHUPlantModeStrategy
Section 3.3
Function Block Description
Function Block Description
AHUPlantModeStrategy Function Block
Function Block Description
The AHUPlantModeStrategy function block sets following operation modes of an air handling
unit (AHU):
 AHU Off Mode
 Night Cycle Mode
 Night Purge Mode
 Occupied Operation Mode
 Extended Operation Mode
 AHU Off Delayed
 Freeze Alarm Mode
 Fan Alarm Mode
 Fire Alarm Mode
Plant Mode
The plant mode signal is a coded signal representing the operation mode for an air handling unit.
AHUPlantModeStrategy supports the following plant modes:
Value
Plant Mode
0
AHU Off
2
Night Cycle
3
Night Purge
4
Occupied operation
5
Extended operation
11
AHU Off Delayed
21
Freeze alarm
22
Fan alarm
23
Fire alarm
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AHUPlantModeStrategy
NOTE:



If more than one plant mode condition is satisfied, the plant mode with the higher value takes
priority and other plant modes are discarded.
If the room temperature sensor (RoomTemp) is not connected, the modes Night Cycle and Night
Purge are disabled.
If the outdoor air temperature sensor (OutdoorAirTemp) is not connected, the Night Purge
mode is disabled.
Night Cycle Mode
The Night Cycle mode maintains a lower room temperature during heating season and higher room
temperature during cooling season.
This mode is selected when the room temperature input RoomTemp exceeds the maximum limit
RoomTempMaxLimit and reduces below the minimum limit RoomTempMinLimit when it is
connected.
The functionality of Night Cycle mode with hysteresis is shown in the timing diagram below:
NOTE: The other plant mode conditions in the timing diagram are assumed as not active.
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AHUPlantModeStrategy
Night Purge Mode
The Night Purge Mode reduces morning cool down energy requirements by using cool outside air
to purge and pre-cool the building.
Night Purge is active if the following conditions are satisfied:
If the current date and time is within the range of Start and Stop time of Night Purge mode.
 If RoomTemp ≥ NightpurgeRoomTempMin with fixed hysteresis of 1.0° C
The functionality of hysteresis in this condition is shown below:


If OutdoorAirTemp ≥ NightpurgeOutdoorAirTempMin with fixed hysteresis of 1.0° C
The functionality of hysteresis in this condition is shown below:
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AHUPlantModeStrategy

If actual difference between RoomTemp and
OutdoorAirTemp ≥ NightpurgeOutdoorAirTempDiff.
The functionality of hysteresis in this condition is shown below:
The parameter NightpurgeDays is used to enable the Night Purge Mode based on the current
day input from RealTimeClock. Each bit in the parameter represents one day as shown in the
table below. If real time clock is not connected, Night Purge Mode is deactivated. The night purge
function is enabled only when the input RealTimeClock is connected to the real time clock of the
controller.
NightPurgeDays
Bit
Day
0
Sunday
1
Monday
2
Tuesday
3
Wednesday
4
Thursday
5
Friday
6
Saturday
7
Not used
Occupied Operation Mode
The Occupied Operation mode is the standard mode during scheduled occupancy. The occupancy
is signaled through the input Schedule.
Extended Operation Mode
The Extended Operation mode is activated when the input ExtendedOper is TRUE. This mode
is used during the extended occupancy due to overtime.
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AHU Off Delayed Mode
AHU Off Delayed mode is required when the air handling unit is equipped with electrical heater or
with humidifiers. In that case the temperature and humidification process is switched off, but the
fans stays in operation to cool down electrical heating coils or remove excessive humidity from the
ducts.
Switching Off of the operation of the AHU is delayed by the period given by the parameter
AHUOffDelay. This delay can be disabled by entering the value 0 for the parameter
AHUOffDelay.
In case of an alarm, the AHU is switched off immediately.
Freeze Alarm Mode
The Freeze Alarm Mode activates when the input FreezeStatAlarm is TRUE. When this mode
is TRUE, following operations are activated and executed by AHUTempCntrlStrategy:
 Dampers are closed
 Heating is set to 100%
 Cooling is disabled
 Fans are switched off
Fan Alarm Mode
The Fan Alarm Mode is activated when the input FanAlarm is TRUE. When this mode is TRUE,
following operations are activated and executed by other AHU function blocks:
 Temperature controller is switched Off
 Dampers are closed
 Heating and cooling is disabled
 Fans are switched Off
Fire Alarm Mode
The Fire Alarm Mode is activated when the input FireAlarm is TRUE. When this mode is TRUE,
following operations are activated and executed by other AHU function blocks:
 Temperature controller is switched Off
 Dampers are closed
 Heating and cooling is disabled
 Fans are switched off
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AHUPlantModeStrategy
Section 3.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
64
Page
Input Pin Description
65
Output Pin Description
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Input Pin Description
Pin Diagram
The following picture shows the pin diagram of AHUPlantModeStrategy:
Input Pin Description
Input
Data Type
Range
Scaling /
Unit
Description
EnableIn
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Enables the function block.
FALSE: Disables the function block.
FreezeStatAlarm
CJ_BIT
TRUE or
FALSE
N/A
Freeze Alarm
FanAlarm
CJ_BIT
TRUE or
FALSE
N/A
Fan Alarm
FireAlarm
CJ_BIT
TRUE or
FALSE
N/A
Fire Alarm
ExtendedOper
CJ_BIT
TRUE or
FALSE
N/A
Extended Operation
Schedule
CJ_BIT
TRUE or
FALSE
N/A
Schedule (Digital)
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Input
Data Type
Range
Scaling /
Unit
Description
RoomTemp
CJ_ANALOG
N/A
0.1° C / ° F
Room Temperature
If the RoomTemp input is not connected,
following functions are disabled:
 Night Purge
 Night Cycle
 Room temperature sensor range checks
 Room temperature short circuit alarm
 Room temperature missing alarm
OutdoorAirTemp
CJ_ANALOG
N/A
0.1° C / ° F
Outdoor Air Temperature
Night Purge Mode is deactivated if the input
OutdoorAirTemp is not connected.
This is an optional input
RealTimeClock
CJ_DATETIME
N/A
N/A
Real Time Clock (RTC) input from the PLC.
This input must be connected to the
standard Hardware RTC.
Night Purge Mode is deactivated if the input
RealTimeClock is not connected.
Default value: 1/1/2000,12:00 AM
This is an optional input.
This is an optional input
Parameter Description
The parameters NightpurgeTimeStart and NightpurgeTimeStop are controlled
parameters. Controlled parameters can be changed, however the changes only become effective
after a reset of the function block.
Parameter
Data Type
Range
Scaling /
Unit
Description
AHUOFFDelay
CJ_WORD
0...600
sec
AHU is switched off after a
delay.
The feature can be disabled
by entering 0 for this
parameter.
InitializationDelay
CJ_WORD
0...600
sec
After a power failure or a
download, the Plant Mode is
initialized with 0.
Once the
InitializationDelay
has elapsed, the value can
change from 0 to 2, 3, 4 or 5.
The feature can be disabled
by entering 0 for this
parameter.
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Parameter
Data Type
Range
Scaling /
Unit
Description
NightpurgeOutdoorAirTempMin
CJ_SHORT
–580...3020
0.1° C / ° F
Night Purge minimum outdoor
air temperature
Default: 100
NightpurgeRoomTempMin
CJ_SHORT
–580...3020
0.1° C / ° F
Night Purge minimum room
temperature
Default: 180
NightpurgeOutdoorAirTempDiff
CJ_SHORT
0...500
0.1° C / ° F
Night Purge difference
between room temperature
and outdoor air temperature
Default: 40
NightpurgeOutdoorAirTempHys
CJ_SHORT
0...500
0.1° C / ° F
Night Purge hysteresis
outdoor air temperature
Default: 20
NightpurgeRoomTempHys
CJ_SHORT
0...500
0.1° C / ° F
Night Purge hysteresis room
temperature
Default: 20
NightpurgeTimeStart
CJ_WORD
0...2359
N/A
Night Purge start time
Default: 200
NightpurgeTimeStop
CJ_WORD
0...2359
N/A
Night Purge stop time
Default: 600
NightpurgeDays
CJ_BYTE
0...255
N/A
Night Purge days. Refer Night
Purge-Plant mode
(see page 61).
Default: 127
NightcycleRoomTempMin
CJ_SHORT
–580...3020
0.1° C / ° F
Night Cycle minimum room
temperature
Default: 100
NightcycleRoomTempMax
CJ_SHORT
–580...3020
0.1° C / ° F
Night Cycle maximum room
temperature
Default: 300
NightcycleRoomTempHys
CJ_SHORT
0...500
0.1° C / ° F
Night Cycle hysteresis room
temperature
Default: 20
RoomTempMaxLimit
CJ_SHORT
–580...3020
0.1° C / ° F
Maximum room temperature
Default: 400
RoomTempMinLimit
CJ_SHORT
–580...3020
0.1° C / ° F
Minimum room temperature
Default: 120
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling /
Unit
Description
EnableOut
CJ_BOOL
TRUE or FALSE
N/A
TRUE: Function block is enabled.
FALSE: Function block is disabled.
PlantMode
CJ_BYTE
0...23
N/A
Plant Mode (see page 59)
Alert
CJ_BOOL
TRUE or FALSE
N/A
Alert Bit
AlertID
CJ_WORD
0...1023
N/A
Alert ID
Alarm
CJ_BOOL
TRUE or FALSE
N/A
Alarm Bit
For future use
AlarmID
CJ_WORD
N/A
N/A
Alarm ID
For future use
Parameter Description
Output
Data Type
Range
Scaling/
Unit
Description
PIDOutput
CJ_WORD
0...1000
N/A
PID output
Version[2]
Array of
2 CJ_BYTE
N/A
N/A
Version information of the function block
Version[0] - Function block version
Version[1] - Function block revision
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AlertID Description
The AlertID output represents a value between 0 and 1023, whereby each bit represents an alert.
The bits and their description are described in the following table:
Alert Bit
Alert Cause
0
Machine operates with less efficiency.
Invalid parameter range. An alert is generated if
any of the following parameters is out of range.
(AHUOffDelay > 600)
(InitializationDelay > 600)
(NightpurgeOutdoorAirTempMin < –580 or
NightpurgeOutdoorAirTempMin > 3020)
(NightpurgeRoomTempMin < –580 or
NightpurgeRoomTempMin > 3020)
(NightpurgeOutdoorAirTempDiff < 0 or
NightpurgeOutdoorAirTempDiff > 500)
(NightpurgeOutdoorAirTempHys < 0 or
NightpurgeOutdoorAirTempHys > 500)
(NightpurgeTimeStart < 0 or
NightpurgeTimeStart > 2359)
(NightpurgeTimeStop < 0 or
NightpurgeTimeStop > 2359)
(NightpurgeTimeStart =
NightpurgeTimeStop)
(NightpurgeRoomTempHys < 0 or
NightpurgeRoomTempHys > 500)
(NightcycleRoomTempMin < –580 or
NightcycleRoomTempMin > 3020)
(NightcycleRoomTempMax < –580 or
NightcycleRoomTempMax > 3020)
(NightcycleRoomTempHys < 0 or
NightcycleRoomTempHys > 500)
(RoomTempMaxLimit < –580 or
RoomTempMaxLimit > 3020)
(RoomTempMinLimit < –580 or
RoomTempMinLimit > 3020)
If NightpurgeTimeStart or
NightpurgeTimeStop values are not suitable to
time format 00:00 (hours 00...23 and minutes
00...59).
1
Alert due to detected analog input channel error for Night Cycle and Night Purge Mode are deactivated.
Room Temperature RoomTemp
2
Alert due to detected analog input channel error for Night Purge Mode is deactivated.
Outdoor Air Temperature OutdoorAirTemp
3
Room temperature ≥ Maximum room temperature
Alert to adjust the room temperature.
4
Room temperature ≤Minimum room temperature
Alert to adjust the room temperature.
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AHUPlantModeStrategy
Alert Bit
Alert Cause
Effect
5
Freeze alarm




Dampers are closed.
Heaters are set to 100%.
Cooling is disabled.
Fans are switched Off.
6
Fan alarm




Dampers are closed.
Temperature control is switched off.
Heating and cooling is disabled.
Fans are switched off.
7
Fire alarm




Dampers are closed
Temperature control is switched off.
Heating and cooling is disabled
Fans are switched off.
8
Real time clock is not connected
Night Purge Mode is deactivated.
9
A controlled parameter has been changed, which
requires a machine restart. The new configuration
parameter is effective after restart of the function
block.
Alert due to a parameter change that has not been
made effective yet.
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Section 3.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm / Alert
Problem
Solution
AlertID.0 TRUE
Incorrect parameter value or configuration
Check the parameters against their
recommended ranges.
AlertID.1 TRUE
Room temperature input sensor is
disconnected or short-circuited.
Check if the room temperature sensor is
connected to the controller and working
properly.
AlertID.2 TRUE
Room temperature input sensor is
disconnected or short-circuited.
Check if the outdoor air temperature
sensor is connected to the controller.
AlertID.3 TRUE
Room Temperature (RMT) input sensor
value exceeds maximum RMT.
Check the actual room temperature.
AlertID.4 TRUE
Room temperature value exceeds the
 Check the actual room temperature.
maximum set value or is below the minimum  Check cooling coil.
value due to:
 Check fans.
 inoperable RMT sensor
 detected error in configuration parameter
 AHU calculated error value of DAT to high
 inoperable cooling function
AlertID.5 TRUE
AHU or its components are inoperable.




AlertID.6 TRUE
Fan is not operating.
 Check motor protection of fans.
 Check the dampers.
 Reset the fans.
AlertID.7 TRUE
Fire alarm input activated
 Validate that the input is in the correct
Check and open the dampers.
Reset the heater temperature.
Set and enable the cooler.
Switch on fans.
state.
 Intervention required by the operator.
AlertID.8 TRUE
Real time clock is not operating.
Check the real time clock connection.
AlertID.9 TRUE
Controlled parameters are changed.
Restart the function block.
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ATV••ModbusCom / ATV•••ModbusCom
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Chapter 4
ATV Modbus Communication: ATV••ModbusCom / ATV••• ModbusCom
ATV Modbus Communication: ATV••ModbusCom / ATV•••
ModbusCom
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
4.1
Functional and Machine Overview
74
4.2
Architecture
77
4.3
Function Block Description
80
4.4
Pin Description
82
4.5
Troubleshooting
88
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ATV••ModbusCom / ATV•••ModbusCom
Section 4.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
74
Page
Functional Overview
75
Machine Overview
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ATV••ModbusCom / ATV•••ModbusCom
Functional Overview
Functional Description
The ATV••/•••ModbusCom function block manages the communication between the controller
and the ATV••/••• drive through Modbus serial line communication protocol.
The function block supports the following ATV drives: ATV12, ATV21, ATV212, ATV31, ATV312,
ATV61 and ATV71.
Why Use the ATV••/•••ModbusCom Function Block?
The ATV••/•••ModbusCom function block is used to manage the following ATV••/••• drive
functionality:
 Control of Start and Stop operation
 Control of frequency
 Monitoring the connection
Features of the ATV••/•••ModbusCom Function Block
The ATV••/•••ModbusCom function block facilitates the following features:
reads and monitors the ATV drive status
 writes the ATV command
 generates an alarm in case of a detected communication error
 reports the detected ATV••/••• drive failure and alarms

Protective Features
The ATV••/•••ModbusCom function block provides the following protective features to help you
avoid the potentials of certain sources of machine malfunction:
Protective Feature
Description
Input range validation
Input ranges are validated to avoid out of range data from
being accepted directly.
Alarm-/alert notification
If an invalid value is entered, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with
reduced performance
Controlled parameter
The input parameters DeviceNr and TimeOut are controlled.
The values of these parameters can be changed, however the
changes are effective only after the restart of the function
block.
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ATV••ModbusCom / ATV•••ModbusCom
Machine Overview
Machine View
The following picture shows an example of the interaction between the function block and the
machine. The ATV••/•••ModbusCom function blocks are general purpose function blocks and
can be used for various machine equipment like fans, compressors and pumps.
ATV21ModbusCom In this example, the function block manages the communication between the controller
and the ATV drive through Modbus communication protocol.
FanMgmt The function block controls the optimum number of fans and the frequency depending on the
required air flow in the machine. FanMgmt manages the switch On/Off of fans.
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Section 4.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
Page
Hardware Architecture
78
Software Architecture
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ATV••ModbusCom / ATV•••ModbusCom
Hardware Architecture
Hardware Architecture Overview
The ATV••/•••ModbusCom can be used in various HVAC&R machines to control equipment like
fans, pumps and compressors.
The figure below shows the architecture of the Air Cooled Chiller:
1
2
3
4
5
6
78
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Soft starters
Motor Control
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ATV••ModbusCom / ATV•••ModbusCom
Software Architecture
Function Block Diagram
The following function block diagram gives you an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables,on the right hand
side the outputs, the Process Commands, as well as the function block ATV••/•••ModbusCom.
The following table gives you an overview of the functions of ATV••/•••ModbusCom:
Function
Description
ATV Drive Control
checks the ATV drive status
Initialization
 During initialization, the function block reads the minimum
and maximum drive frequency.
 If the requested frequency is not within the frequency limits,
an alarm is generated.
Modbus Semaphore
Manager
helps to ensure that the instances have equal rights to send
Modbus messages
Modbus Queue Manager
 supports Modbus communication
 The Modbus Queue has a fixed size of 10 messages.
Monitor Modbus Comm
helps to ensure a stable communication with the ATV drive
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Section 4.3
Function Block Description
Function Block Description
ATV••/•••ModbusCom Function Block
Function Block Description
The ATV••/•••ModbusCom function block is used for the communication between the controller
and the ATV drive through the Modbus serial connection.
The ATV••/•••ModbusCom function block initializes the drive to Start or to Stop. It also checks
the Modbus communication.
ATV Drive Operation
The ATV••/•••ModbusCom function block manages the ATV drive as follows:
Initialize the drive
 Start the drive
 Stop the drive
 Check the Modbus communication

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ATV Error Management
The ATV drive detected errors and alarms are indicated by the output alarm. The output Alarm is
set to TRUE, when the Modbus device is not responding, which means that there is currently no
Modbus device communication.
The output AlarmID indicates which alarm occurs.
The output AlertID indicates which alert occurs.
WARNING
LOSS OF CONTROL





The designer of any control scheme must consider the potential failure modes of control paths
and, for certain critical control functions, provide a means to achieve a safe state during and
after a path failure. Examples of critical control functions are emergency stop and overtravel
stop, power outage and restart.
Separate or redundant control paths must be provided for critical control functions.
System control paths may include communication links. Consideration must be given to the
implications of unanticipated transmission delays or failures of the link.
Observe all accident prevention regulations and local safety guidelines.1
Each implementation of this equipment must be individually and thoroughly tested for proper
operation before being placed into service.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
1
For additional information, refer to NEMA ICS 1.1 (latest edition), "Safety Guidelines for the
Application, Installation, and Maintenance of Solid State Control" and to NEMA ICS 7.1 (latest
edition), "Safety Standards for Construction and Guide for Selection, Installation and Operation of
Adjustable-Speed Drive Systems" or their equivalent governing your particular location.
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Section 4.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
82
Page
Input Pin Description
83
Output Pin Description
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Input Pin Description
Pin Diagram
The following picture shows the pin diagram of ATV••/•••ModbusCom:
Input Pin Description
Input
Data Type
Range
Scaling/Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block
xCommand
CJ_BIT
TRUE or FALSE
N/A
Start / stop drive
wFreqSetp
CJ_WORD
0...65535
0.1 Hz
Drive frequency
byDeviceNr
CJ_BYTE
0…247
N/A
Modbus device address
wTimeOut
CJ_WORD
0...100 for ATV21, ATV212
1...30 for ATV12, ATV61 and ATV71
1...10 for ATV31, ATV312
sec
Modbus device time out
xDirection
CJ_BIT
TRUE or FALSE
N/A
FALSE: forward direction
TRUE: reverse direction
xReset
CJ_BIT
TRUE or FALSE
N/A
Reset drive detected alarm
NOTE: Alarms are automatically reset when the input xReset is constant TRUE.
NOTE: The inputs byDeviceNr and wTimeOut are controlled parameters. Controlled parameters
can be changed, however the changes only become effective after re-enable of the function block.
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ATV••ModbusCom / ATV•••ModbusCom
NOTE: A change of the xDirection input will not have an effect when the drive is in RUN mode.
For example, if the drive is in RUN mode and the initial value of xDirection was FALSE (forward
direction), changing the value of the input to TRUE (reverse direction) will not have an immediate
effect; the drive will continue to command a forward direction. The drive must first be stopped and
restarted before the input change is recognized and for the change of direction to take effect.
You must carefully manage the module’s Modbus network addresses because each device on the
network requires a unique address. Having multiple devices with the same address can cause
unpredictable operation of your network and associated equipment.
CAUTION
LOSS OF COMMUNICATION
Each device on the Modbus network must have a unique number.
Failure to follow these instructions can result in injury or equipment damage.
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling/Unit
Description
wActFreq
CJ_WORD
0...65535
0.1 Hz
Actual frequency drive
byState
CJ_BYTE
0...5
N/A
State of drive
wAlertID
CJ_WORD
0...65535
N/A
Alert identifier
wAlarmID
CJ_WORD
0...65535
N/A
Alarm identifier
NOTE: The ATV drive detected errors and alarms are indicated by the outputs wAlertID and
wAlarmID.
byState Description
The output byState represents a value between 0 and 5, whereby each number represents a
state of the ATV drive. The following table describes the values and their description:
Value
Description
0
Drive initializing
1
Drive stops
2
Drive starting
3
Drive runs
4
Drive stopping
5
Drive in alarm
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AlertID Description
The AlertID output represents a value between 0 and 7, whereby each bit represents an alert. The
bits and their description are described in the following table:
Alert Bit
Alert Cause
Effect
0
The controlled parameter byDeviceNr is changed.
Changing a controlled parameter requires a machine
restart.
The controlled configuration parameter setting is
effective only after a restart of the function block.
 Present changes are not active.
 The function block uses the previously
1
The controlled parameter wTimeOut is changed.
Changing a controlled parameter requires a machine
restart.
The controlled configuration parameter setting is
effective only after a restart of the function block.
2
Frequency is out of range.
Frequency is above maximum frequency of the ATV
drive.
3
Frequency is out of range.
Frequency is below minimum frequency of the ATV
drive.
4-15
not used
86
set values.
The frequency input is ignored and not
communicated to ATV drive.
N/A
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ATV••ModbusCom / ATV•••ModbusCom
AlarmID Description
The AlarmID output represents a value between 0 and 7, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
Effect
0
Invalid range input byDeviceNr
The function block is disabled.
1
Invalid range input wTimeOut
2
A communication error has been detected.
 Communication to ATV drive is not
possible.
 FB will try to automatically recover
communication.
3
Reserved
N/A
4
An error caused by motor over current has been
detected.
 The motor is stopped.
 The function block is disabled.
5
An error caused by motor short circuit has been
detected.
6
An error caused by motor overload has been
detected.
7
An error caused by motor phase loss has been
detected.
8
An error caused by mains over voltage has been
detected.
9
An error caused by motor input phase loss has been
detected.
10 to 15
Not used
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ATV••ModbusCom / ATV•••ModbusCom
Section 4.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm / Alert
Problem
Solution
wAlertID.0
A controlled parameter has been changed.
Enable the function block again.
wAlertID.1
The frequency is out of range. The
frequency is above maximum frequency
ATV drive
1. Check the minimum and maximum
frequency set in the ATV drive.
2. After changing the ATV drive parameters,
disable and enable the function block.
3. Check the application program parameters
for maximum frequency settings.
wAlertID.2
1. Check the minimum and maximum
The frequency is out of range. The
frequency set in the ATV drive.
frequency is below minimum frequency ATV
2. After changing the ATV drive parameters,
drive
disable and enable the function block.
3. Check the application program parameters
for maximum frequency settings.
wAlarmID.0
Invalid parameter value (byDeviceNr)
Check the parameters against their ranges.
wAlarmID.1
Invalid parameter value (wTimeOut)
Check the parameters against their ranges.
wAlarmID.2
A communication time out error has been
detected.
No communication to the Modbus device
1. Check the wiring and addressing externally.
2. Disable and enable the function block.
wAlarmID.4
A motor over current error has been
detected.
Check the motor.
wAlarmID.5
A motor short circuit current error has been
detected.
wAlarmID.6
A motor overload error has been detected.
wAlarmID.7
A motor phase loss error has been detected.
wAlarmID.8
A mains over voltage error has been
detected.
wAlarmID.9
A motor input phase loss error has been
detected.
NOTE: AlarmID.3 is no longer supported.
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CompMgmt
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Chapter 5
Compressor Management: CompMgmt
Compressor Management: CompMgmt
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
5.1
Functional and Machine Overview
90
5.2
Architecture
94
5.3
Function Block Description
97
5.4
Pin Description
102
5.5
Troubleshooting
111
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89
CompMgmt
Section 5.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
90
Page
Functional Overview
91
Machine Overview
93
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CompMgmt
Functional Overview
Functional Description
The CompMgmt (Compressor Management) function block controls together with the function block
WtrTempDbCntrl (Water Temperature Deadband Control) the chilled water temperature in an
HVAC&R system.
In a refrigeration machine, compressors need to be managed in a way to help prevent their failures
and balance machine lifetime.
The CompMgmt function block controls up to 4 compressors and aims to manage the optimum
functionality of compressors. For this purpose, CompMgmt provides features for compressor failure
management and to optimize operation.
Why Use the CompMgmt Function Block?
The CompMgmt function block is used for the following purposes:
Purpose
Description
Runtime optimization
 increase the control accuracy
 balance operating hours
 avoid frequent ON/OFF switching of compressors
Failure management
 switch off a compressor in case of a detected failure and
switch on another
Features of the CompMgmt Function Block
The CompMgmt function block provides the following features:
 supports 1 to 4 compressors
 switches on and off the number of compressors required to control the chilled water
temperature, calculated by the function block WtrTempDbCntrl.
 balances compressor operating hours by using one of the 3 methods:
 FIFO
 Runtime
 LIFO



prevents frequent switching of a compressor by On/Off time management
compressor changeover management in case of a detected compressor failure
compressor maintenance notification: CompMgmt calculates the compressor operating hours
and provides information when maintenance is required.
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CompMgmt
Protective Features
The CompMgmt function block provides the following protective features to help you avoid the
potentials of certain sources of machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of range data
from being accepted directly.
Alarm-/alert notification
If an invalid value is entered, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with reduced
performance
Controlled parameter
92
Parameters like CompMode, CompMaxNb and CompSeq are
controlled.
The configuration of these parameters can be changed, however the
changes are effective only after the restart of the function block.
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CompMgmt
Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
WtrTempDbCntrl This function block controls the chilled water temperature, calculates the required number
of compresssors and sends a request to the CompMgmt fuction block.
CompMgmt This function block controls up to 4 compressors and manages the switch On/Off of compressors.
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CompMgmt
Section 5.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
94
Page
Hardware Architecture
95
Software Architecture
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CompMgmt
Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture of the Air Cooled Chiller:
1
2
3
4
5
6
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Soft starters
Motor Control
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CompMgmt
Software Architecture
Function Block Diagram
The following function block diagram provides an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables,on the right hand
side the outputs, the Process Commands, as well as the function block CompMgmt.
The following table gives you an overview of the functions of CompMgmt:
Function
Description
ON/OFF Decision
evaluates the number of requested compressors in regard of the number of compressors
actually running
Availability Check




Sequencing
determines, which compressor is switched ON/OFF next based on three methods:
 FIFO
 Runtime
 LIFO
Operation Hours Counter
checks the availability for the configured number of compressors
evaluates compressor alarms
evaluates compressor minimum ON/OFF time
evaluates compressor operation hours for switching ON
counts the accumulated runtime of the compressors for:
 switch ON/OFF decisions
 for checking maintenance intervals
ON/OFF Timer
manages 3 compressor timers:
 CompMinOnTime
 CompMinOffTime
 CompMinCycleTime
Selection
 selects the compressor to be switched on next, based on Compressor Sequencing
and Availability.
 considers the minimum time CompMinStartsDelay between the starts of two
compressors
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Section 5.3
Function Block Description
Function Block Description
CompMgmt Function Block
Function Block Description
The CompMgmt function block controls up to 4 compressors. Operating hours are balanced using
various methods. The CompMgmt failure management function automatically commands a new
compressor when an operating compressor has a failure.
The following methods for compressor management are provided:
Compressor Sequence Control
 Compressor Failure Management
 Compressor ON/OFF Timing Control
 Compressor Selection Timing Control
 Compressor Operation Hours
 Compressor Maintenance Notification

Compressor Sequence Control
The purpose of the Compressor Sequence Control is to balance the number of operating hours
and starts/stops between the compressors.
Compressor Sequence Control helps to ensure an even usage of the compressors and hence
helps to protect the compressors and optimizes power consumption.
Compressors are controlled based on the following sequences:
Sequence as per
CompMode
Description
FIFO = First In First Out
 The compressor with lowest operating hours is switched on first.
 The first compressor which is switched on is also the first to be switched
off.
 Advantage: operation time is limited.
Runtime
 The compressor with lowest operating hours is the first compressor to be
switched on.
 The compressor with highest operating hours is the first compressor to
be switched off.
 Advantage: best balanced operation hours
LIFO = Last In First Out
 The parameter CompSeq[4] determines this sequence.
 The first compressor to be switched on is the first one in the sequence.
 The first compressor to be switched off is the last one that has been
switched on.
 Advantage: priority of compressor usage can be set.
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Compressor Failure Management
The compressor which is detected as non-operating will be switched off. The next available
compressor in the start sequence will be switched on.
The non-operating compressor can not be started until the detected failure is rectified.
Compressor On/Off Timing
Each compressor provides 3 timers which influence the compressor command ON/OFF behavior.
They are active when the machine is shortly switched off:
98
Timer
Description
CompMinOnTime
Compressor Minimum ON-Timer:
This represents the minimum ON time of the compressor.
Once the compressor has been started, it remains on until the
set time has elapsed.
The timing diagram shows the minimum compressor ON time:
CompMinOffTime
Compressor Minimum OFF-Timer:
This represents the minimum OFF time of the compressor.
The compressor will not be restarted, until the selected minimum
time has elapsed since the last shutdown.
The following timing diagram shows the minimum compressor
OFF time, based on the assumption that CompMinOnTime is 0:
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Timer
Description
CompMinCycleTime
Compressor Minimum Cycle Timer:
This is the minimum time that must elapse between two
consecutive starts of the same compressor.
It is used to limit the number of starts per hour. If, for example,
the maximum number of starts per hour is 10, set a value of 360
seconds in order to achieve that the limit is observed.
The following timing diagram shows the cycle time of the same
compressor, based on the assumption that CompMinOnTime
and CompMinOffTime are 0.
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CompMgmt
Compressor Selection Timing Control
Timer
Description
CompMinStartsDelay Compressor Minimum Starts Delay:
This is the minimum time that must elapse between the starts of
two different compressors. During this time no other compressor
can be started again.
The following timing diagram shows the minimum time of
different compressors:
Compressor Operation Hours
The compressor operation hours are calculated for each compressor and influence the switch
ON/OFF behavior of the compressor.
The total accumulated operation hours for each compressor are displayed for each compressor by
the output CompOperHours[4].
If a compressor is to be replaced, you can reset the compressor operation hours to 0 by setting the
input CompOperHoursRst[4] to 1.
CompOperHoursRst[4] is reset on the rising edge.
Compressor Maintenance Notification
You can set a value for the maintenance interval for the compressors.
An alert informs you, when the interval time has elapsed, that means when the compressor
operating hours reach the set number of maintenance interval hours:
CompOperHours[n] ≥ CompMaintInterval
After maintenance has been performed, the alert can be reset by means of the parameter
CompMaintAlertRst[4] and the maintenance interval is restarted.
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Pump-down with delay
On machines with power above a certain limit and where there is a substantial amount of
refrigerant, the pump-down procedure is necessary to partially empty the evaporator of excess
refrigerant. Therefore, the solenoid valve situated upstream from the related evaporator is
controlled in such a way that the compressor remains ON for the time interval Compressor SwitchOFF delay in pump-down (PumpDwnDelay). At compressor start-up, the solenoid valve is opened
at the precise same instant.
Pump-down with minimum pressure limit
In case a low pressure transducer (EvapPress) is available, the pump-down function can monitor
the evaporator pressure and keep the compressor ON until the evaporator pressure drops below
the Pump -down minimum pressure (PumpDwnMinPress).
NOTE: In case of a compressor alarm, the pump down function will be ignored and the compressor
will be switched OFF.
NOTE: The functions Pump-down with delay (PumpDwnDelay) and Pump-down with minimum
pressure limit (PumpDwnMinPress), can be combined. The compressor is stopped when the first
condition to stop the compressor is reached.
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CompMgmt
Section 5.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
102
Page
Input Pin Description
103
Output Pin Description
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Input Pin Description
Pin Diagram
The following picture shows the pin diagram of CompMgmt:
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CompMgmt
Input Pin Description
Input
Data Type
Range
Scaling/Unit
Description
EnableIn
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Enables the function block.
FALSE: Disables the function block.
Please see also the description below this
table.
EvapPress
CJ_ANALOG N/A
CompReqNb
CJ_BYTE
0...4
N/A
Requested number of compressors to be
controlled.
The range varies based on the value of
CompMaxNb parameter.
Comp01Alarm
CJ_BIT
TRUE or
FALSE
N/A
Compressor 1 alarm
TRUE: Alarm is active
FALSE: Alarm is not active
Comp02Alarm
CJ_BIT
TRUE or
FALSE
N/A
Compressor 2 alarm
TRUE: Alarm is active
FALSE: Alarm is not active
Comp03Alarm
CJ_BIT
TRUE or
FALSE
N/A
Compressor 3 alarm
TRUE: Alarm active.
FALSE: Alarm is not active.
Comp04Alarm
CJ_BIT
TRUE or
FALSE
N/A
Compressor 4 alarm
TRUE: Alarm active.
FALSE: Alarm is not active.
HighPressAlarm
CJ_BIT
TRUE or
FALSE
N/A
Condensing pressure alarm
TRUE: Alarm active.
FALSE: Alarm is not active.
0.01 Bar/0.1 PSI Evaporator refrigerant gauge pressure
High Pressure Alarm is a safety device and indicates an alarm when the pressure exceeds a
maximum limit.
DANGER
REFRIGERANT POISONING OR FREEZER BURNS


Stop the compressor operation in case of a high pressure alarm.
Interlock the high pressure alarm switch with the compressors using contactors in the electrical
cabinet.
Failure to follow these instructions will result in death or serious injury.
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EnableIn
If the input EnableIn is FALSE:
The compressor commands Comp01Command to Comp04Command are set to FALSE.
 Alarm, Alert, AlarmID and AlertID are reset to 0.

NOTE: Each input pin must be connected to a physical input or a software variable in the
application program.
Parameter Description
The parameters CompMaxNb and CompMode are controlled parameters. Controlled parameters
can be changed, however the changes only become effective after a reset of the function block.
Parameter
Data Type Range
Scaling /
Unit
Description
CompMaxNb
CJ_BYTE
1...4
N/A
Maximum number of compressors to be switched
on.
Default: 2
CompMode
CJ_BYTE
0...2
N/A
Compressor control sequence mode
0 FIFO
1 Runtime
2 LIFO
CompSeq[4]
Array
[4]of
CJ_BYTE
1...4
N/A
Compressor 1 to 4 start sequence (priority in
sequencing mode LIFO).
Default:
CompSeq[0] = 1
CompSeq[1] = 2
CompSeq[2] = 3
CompSeq[3] = 4
The array index 0...3 corresponds to the respective
compressor 1...4.
Default: 0
If the same priority is set for more than one
compressor, the compressor with the lowest index
has priority.
Example:
CompSeq[0] = 3
CompSeq[1] = 2
CompSeq[2] = 2
CompSeq[3] = 4
The compressor start sequence is here as follows:
Comp02, Comp03, Comp01 and Comp04.
CompMinOnTime
CJ_WORD
0...3600
1sec
Minimum time the compressor must be ON.
Default: 400
CompMinOffTime
CJ_WORD
0...3600
1sec
Minimum time the compressor must be OFF.
Default: 400
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Parameter
Data Type Range
Scaling /
Unit
Description
CompMinCycleTime
CJ_WORD
0...3600
1sec
Minimum time that must elapse between two
consecutive starts of the same compressor.
Default: 600
CompMinStartsDelay
CJ_WORD
0...3600
1sec
Minimum time between start of 2 different
compressors.
Default: 600
CompMaintInterval
CJ_WORD
0...65000
1Hr
Compressor maintenance alert hours.
Default: 5000
0 = Alert disabled
CompOperHoursRst[4]
Array
[4]of
CJ_BIT
TRUE or
FALSE
N/A
Reset operation hours of compressor 1 to 4.
The reset occurs at the rising edge.
CompMaintAlertRst[4] Array
[4]of
CJ_BIT
TRUE or
FALSE
N/A
Reset maintenance alert of compressor 1 to 4.
The reset occurs at the rising edge.
0.01 Bar/
0.1 PSI
Pump down minimum pressure
sec
Pump down delay
PumpDwnMinPress
CJ_SHORT 0...32737
PumpDwnDelay
CJ_WORD
0...65535
CompOperHoursRst[0] to CompOperHoursRst[3]
The rising edge of CompOperHoursRst[n] resets the parameter CompOperHours[n] to 0 and
an alert related to CompOperHours[n] is reset to FALSE.
The array index 0...3 corresponds to their respective compressor 1...4.
CompMaintAlertRst[0] to CompMaintAlertRst[3]
Rising edge of CompMaintAlertRst[0...3] resets the respective Comp01...04
maintenance alert.
The array index 0...3 corresponds to their respective compressor 1...4.
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling/
Unit
Description
EnableOut
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Function block is enabled
FALSE: Function block is disabled
CompActNb
CJ_BYTE
0...4
N/A
Number of compressors actually
running
CompActPerc
CJ_WORD
0...1000
0,1%
Percentage of compressors running
CompActPerc = (CompActNb x 1000)
/ CompMaxNb
Comp01Command
CJ_BIT
TRUE or
FALSE
N/A
Compressor 1 ON command
Comp02Command
CJ_BIT
TRUE or
FALSE
N/A
Compressor 2 ON command
Comp03Command
CJ_BIT
TRUE or
FALSE
N/A
Compressor 3 ON command
Comp04Command
CJ_BIT
TRUE or
FALSE
N/A
Compressor 4 ON command
CmdSolenoidValve
CJ_BIT
TRUE or
FALSE
N/A
Cooling Medium Solenoid Valve
Helps to ensure, the cooling medium
does not get into the compressor.
CompMaxNbAvail
CJ_BYTE
0...4
N/A
The maximum number of compressors
available.
Alert
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Alert
FALSE: No alert
AlertID
CJ_WORD
0...2047
N/A
TRUE: Alert
FALSE: No alert
Default: 0
AlertID provides an alert code.
Please see also the table below.
Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Alarm
FALSE: No alarm
AlarmID
CJ_WORD
0...3
N/A
If this input is not equal to 0, the
compressor commands
Comp01Command...Comp04Command
are set to FALSE.
If this input is equal to 0, no alarm is
detected.
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Parameter Output Pin Description
Parameter
Data Type
Range
Scaling/
Unit
Description
CompOperHours[4]
Array [4] of
CJ_DWORD
0...71,582,788
1Hr
Total operating hours of compressor 1
to 4
Array index 0...3 corresponds to
respective compressor 1 to 4.
Version[2]
Array [2] of
CJ_BYTE
N/A
N/A
Version information of function block
Version[0] - Function block version
Version[1] - Function block revision
CompMinOnTimeStatus
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Compressor Minimum ONTimer is running
FALSE: Compressor Minimum ONTimer has elapsed
CompMinOffTimeStatus
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Compressor Minimum OFFTimer is running
FALSE: Compressor Minimum OFFTimer has elapsed
CompMinCycleTimeStatus
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Compressor Minimum Cycle
Timer is running
FALSE: Compressor Minimum
CycleTimer has elapsed
CompStartDelayStatus
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Compressor Start Delay Timer
is running
FALSE: Compressor Start Delay Timer
has elapsed
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Alert ID Description
The AlertID output represents a value between 0 and 2047, whereby each bit represents an alert.
The bits and their description are described in the following table:
Alert Bit
Alert Cause
0
Function block operates, however with
Improper parameter value or configuration.
This alert is generated when one of the following conditions limited performance.
is TRUE:
 CompReqNb > 4
 CompMinOnTime > 3600
 CompMinOffTime > 3600
 CompMinCycleTime > 3600
 CompMinStartsDelay > 3600
 CompMaintInterval > 65000
1
Compressor01 alarm input is active
2
Compressor02 alarm input is active
3
Compressor03 alarm input is active
4
Compressor04 alarm input is active
5
Alert for compressor maintenance.
Compressor01maintenance alert is active.
For alert generation logic refer to Compressor Maintenance
(see page 100).
6
Compressor02maintenance alert is active.
For alert generation logic refer to Compressor Maintenance
(see page 100).
7
Compressor03maintenance alert is active.
For alert generation logic refer to Compressor Maintenance
(see page 100).
8
Compressor04maintenance alert is active.
For alert generation logic refer to Compressor Maintenance
(see page 100).
9
The request for compressors exceeds the maximum
number of compressors.
(CompReqNb > CompMaxNb) is TRUE.
Alert that number of compressors
cannot be incremented to match the
number of requested compressors.
10
The change of a controlled parameter is not active.
Changing a controlled parameter requires a machine
restart. The controlled configuration parameter setting is
effective only after restart of the function block.
Present changes are not active.
Function block uses the previously set
values.
11...15
Not used
N/A
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Compressor does not operate.
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CompMgmt
Alarm ID Description
The AlarmID output represents a value between 0 and 3, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
Effect
0
Invalid parameter configuration.
If one of the following parameters is TRUE:
 CompMaxNb < 1 or CompMaxNb > 4
 CompMode > 2
 CompSeq[0] < 1 or CompSeq[0] > 4
 CompSeq[1] < 1 or CompSeq[1] > 4
 CompSeq[2] < 1 or CompSeq[2] > 4
 CompSeq[3] < 1 or CompSeq[3] > 4
Function block is disabled.
1
The compressor alarm inputs are active.
The compressors are not operating.
2...15
Not used
N/A
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Section 5.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm / Alert
Problem
Solution
AlarmID.0 TRUE
Invalid parameter value
1. Check the parameter ranges.
2. Set the values within the defined ranges.
AlarmID.1
AlertID.1
AlertID.2
AlertID.3
AlertID.4
One compressor is not operating.
The compressors are not operating.
Check OEM machine manual.
Also check the following points:
 Enable function block.
 Check compressor alarm inputs.
 Wait until the time of still active timers has
elapsed.
 Check the number of compressors set in
CompMaxNb.
TRUE
TRUE
TRUE
TRUE
TRUE
Reset the compressor alarm inputs when the
problem has been solved.
AlertID.0 TRUE
Invalid parameter value
Check the parameters ranges.
AlertID.5
AlertID.6
AlertID.7
AlertID.8
Alert for maintenance of compressor.
Maintain the compressor and then reset.
AlertID.9 TRUE
Different setting for CompMaxNb
Check the number of compressors set in
CompMaxNb.
The setting must be conform with the setting of the
function block WtrTempCntrl.
AlertID.10 TRUE
Controlled parameters are changed
Restart the function block.
TRUE
TRUE
TRUE
TRUE
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FanMgmt
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Chapter 6
Fan Management: FanMgmt
Fan Management: FanMgmt
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
6.1
Functional and Machine Overview
114
6.2
Architecture
118
6.3
Function Block Description
122
6.4
Pin Description
131
6.5
Troubleshooting
140
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FanMgmt
Section 6.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
114
Page
Functional Overview
115
Machine Overview
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FanMgmt
Functional Overview
Functional Description
The FanMgmt (Fan Management) function block manages together with the function block
FloatingHighPresCntrl (Floating Pressure High Control) the chilled water temperature in an
HVAC&R system.
The FanMgmt function block controls up to 12 fans and aims to manage the optimum number of
fans and their required frequency depending on the required air flow in the machine. For this
purpose, FanMgmt provides features for switching management and to optimize operation.
Why Use the FanMgmt Function Block?
The FanMgmt function block is used for the following purposes:
Purpose
Description
Runtime optimization
 increase the control accuracy
 balance operation hours
 avoid frequent ON/OFF switching of fans
Failure management
 switch off a fan in case of a detected failure and switch on
another
Features of the FanMgmt Function Block
The FanMgmt function block manages the following functions of the fan:
 supports the management of 1 to 12 fans
 switches on and off the number of fans required (calculated by FloatingHighPresCntrl FB)
to control the chilled water temperature
 balances fan operation hours by using one of the following two methods:
 FIFO
 Runtime




controls the On/Off sequence of condenser fans
fan switching management in case of a detected fan failure
calculates the required fan speed by using one of the following two methods:
 Automatic mode
 Manual mode
fan maintenance notification: FanMgmt calculates the fan operation hours and notifies when
maintenance is required.
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Protective Features
The FanMgmt function block provides the following protective features to help you avoid the
potentials of certain sources of machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of
range data from being accepted directly.
Alarm-/alert notification
If you enter an invalid value, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with
reduced performance
Controlled parameter
116
Parameters like FanMode, FanMaxNb and FanSeq are
controlled.
The configuration of these parameters can be changed,
however the changes are effective only after the restart of the
function block.
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Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
FloatingHighPresCntrl This function block gives out 2 signals, FanReqNb and FanControlSignal
FanMgmt This function block controls the optimum number of fans and the frequency depending on the
required air flow in the machine. FanMgmt manages the switch On/Off of fans.
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FanMgmt
Section 6.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
118
Page
Hardware Architecture
119
Software Architecture
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Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture of the Air Cooled Chiller.
1
2
3
4
5
6
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Soft starters
Motor Control
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FanMgmt
Software Architecture
Function Block Diagram
The following function block diagram gives you an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables,on the right hand
side the outputs, the Process Commands, as well as the function block FanMgmt
The following table gives you an overview of the functions of FanMgmt:
120
Function
Description
ON/OFF Decision
evaluates the number of requested fans in regard of the number of fans
actually running
Availability Check




Sequencing
determines which fan is switched ON/OFF next based on two methods:
 FIFO
 Runtime
Operation Hours Counter
counts the accumulated runtime of the fans for:
 switch ON/OFF decisions
 for checking maintenance intervals
checks the availability for the configured number of fans
evaluates fan alarms
evaluates fan minimum ON/OFF time
evaluates fan operation hours for switching ON
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Function
Description
Increment/Decrement
Timer
controls the fan increment/decrement sequence by means of the following
parameters:
 FanDelayCmd
 FanDelayFreq
 FanDelayIncr
 FanDelayDecr
Selection
determines the fan to be switched on next, based on the ON/OFF Timer and
Operation Hours Counter
Frequency Calculation
calculates the frequency for currently operating fans based on:
 Mode: Automatic or Manual
 Fan minimum/maximum frequency
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FanMgmt
Section 6.3
Function Block Description
Function Block Description
FanMgmt Function Block
Function Block Description
The FanMgmt function block controls up to 12 fans.
The FanMgmt function block manages runtime balancing, detected failure switch over and
minimum On/Off cycle time of fans. This function block works in combination with the FloatingHighPresCntrl function block to control the cold source condensation temperature.
The following methods for fan management are provided:
Fan Sequence Control
 Fan Failure Management
 Fan Operation Hours Control
 Fan Maintenance Notification
 Fan Frequency Calculation
 Fan Increment / Decrement Timer

Fan Sequence Control
The purpose of the Fan Sequence Control is to balance the number of operation hours and
starts/stops between the fans.
Fan Sequence Control helps to ensure an even usage of the fans and hence helps to protect the
fans and optimizes power consumption.
Fans are controlled based on the following sequences:
Sequence
Description
FIFO = First In First Out
 The fan with lowest operating hours is switched on first.
 The first fan which is switched on is also the first to be switched off.
 Advantage: operation time is limited.
Runtime
 The fan with lowest operating hours is the first fan to be switched on.
 The fan with highest operating hours is the first fan to be switched off.
 Advantage: best balanced operation hours
Fan Failure Management
The fan which is detected as non-operating will be switched off. The next available fan in the start
sequence will be switched on.
The non-operating fan can not be started until the detected failure is rectified.
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Fan Operation Hours Control
The fan operation hours are calculated for each fan and influence the switch ON/OFF behavior of
the fan.
The total accumulated operation hours for each fan are displayed for each fan by the output
FanOperHours[12].
If a fan is to be replaced, you can reset the fan operation hours to 0 by setting the input
FanOperHoursRst[12] to 1.
FanOperHoursRst[12] is reset at the rising edge.
Fan Maintenance Notification
You can set a value for the maintenance interval for the fans.
An alert informs you, when the interval time has elapsed, that means when the fan operation hours
reach the set number of maintenance interval hours:
After maintenance has been performed, the alert can be reset by means of the parameter
FanMaintAlertRst[4] and the maintenance interval is restarted.
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Fan Frequency Calculation
The fan frequency calculation is controlled by 4 modes specified in the FanFreqMode parameter.
Manual mode
 Automatic mode
 Advanced control - manual frequency saturation mode
 Advanced control - auto frequency saturation mode

The following table provides an overview of the different modes:
Mode
Description
Manual
 The fan speed signal is selected from the frequency specified in
FanManualFreq[n] and the number of fans in operation.
 When the fans are in operation, FanControlSignal is set as fan speed
signal and limiting between FanFreqMin and FanFreqMax values.
 If LowNoiseOper is TRUE, FanFreqMax reduces by a value specified in
parameter LowNoiseFreqReduction.
Auto
 The fan speed is calculated based on the number of fans in operation using
the following formula:
 When all fans are in operation, FanControlSignal is set as fan speed
signal after limiting between FanFreqMin and FanFreqMax values.
 If FanFreqMin < 50, then 50 is considered as FanFreqMin.
 If LowNoiseOper = TRUE, FanFreqMax is reduced by a value specified
in the parameter LowNoiseFreqReduction.
Advanced control Manual frequency
saturation
 The maximum fan speed signal is calculated from the frequency specified
Advanced control - Auto
frequency saturation
 The input FanControlSignal is set as fan speed signal after limiting
in the parameter FanManualFreq[n] and the number of fans in
operation.
The input FanControlSignal is set as fan speed signal and limited
between FanFreqMin and FanManualFreq[n].
 When all fans are in operation, FanControlSignal is set as fan speed
signal and limited between FanFreqMin and FanFreqMax values.
 If LowNoiseOper = TRUE, FanFreqMax is reduced by a value specified
in the parameter LowNoiseFreqReduction.
between FanFreqMin and frequency f. When all fans are in operation,
FanControlSignal is set as fan speed signal after limiting between
FanFreqMin and FanFreqMax values.
 If FanFreqMin < 50, then 50 is considered as FanFreqMin.
 If LowNoiseOper = TRUE, FanFreqMax is reduced by a value specified
in the parameter LowNoiseFreqReduction.
For more detailed information, please also refer to the examples on the following pages.
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FanMgmt
Manual Mode
The figure below shows an example for the fan frequency calculation in manual mode. The
minimum and maximum frequency is set to 20 Hz and 50 Hz:
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FanMgmt
Auto Mode
The figure below shows an example for the fan frequency calculation in auto mode. The minimum
and maximum frequency is set to 20 Hz and 50 Hz:
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FanMgmt
Advanced Control - Manual Frequency Saturation Mode
The figure below shows an example for the manual fan frequency calculation in saturation mode.
The minimum and maximum frequency is set to 20 Hz and 50 Hz:
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FanMgmt
Advanced Control - Auto Frequency Saturation Mode
The figure below shows an example for the auto mode fan frequency calculation in saturation
mode. The minimum and maximum frequency is set to 20 Hz and 50 Hz:
Fan Increment / Decrement Timer
The FanMgmt function block controls the fan increment sequence by the delay time set in the input
parameters:
 FanDelayCmd
 FanDelayFreq
 FanDelayIncr
The FanMgmt function block differs the increment and the decrement sequence:
128
Sequence
Description
Increment Sequence
When the number of fans is incremented, the fan speed is
reduced to the minimum frequency for a short duration before
the next fan is requested to start.
Decrement Sequence
When the number of fans is decremented, the fan speed is
reduced to the minimum frequency for a short duration before
the next fan is requested to stop
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FanMgmt
Fan Increment Sequence
The timing diagram below describes the incrementing sequence of the FanMgmt function block:
If...
Then...
the number of required fans is
set from 0 to 1
 the frequency FanFreq is set to the minimum frequency
 Fan01Command is switched On after the time delay
FanDelayCmd
 FanFreq is set to the new fan frequency after the time
delay FanDelayFreq
 The next fan can be switched On only after the
FanDelayIncr timer is complete
the number of required fans is
set from 1 to 2
 the frequency FanFreq is set to the minimum frequency
 Fan02Command is switched On after the time delay
FanDelayCmd
 FanFreq is set to the new fan frequency after the time
delay FanDelayFreq
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FanMgmt
Fan Decrement Sequence
This timing diagram shows the decrement sequence of the FanMgmt function block:
If...
Then...
the number of required fans is
set from 2 to 1
 the frequency FanFreq is set to the minimum frequency
 Fan02Command is switched Off after the time delay
FanDelayCmd
 FanFreq is set to the new fan frequency after the time
delay FanDelayFreq
 The next fan can be switched Off only after the
FanDelayIncr timer is complete
the number of required fans is  the frequency FanFreq is set to the minimum frequency
set from 1 to 0
 Fan01Command is switched Off after the time delay
FanDelayCmd
 FanFreq is set to the new fan frequency after the time
delay FanDelayFreq
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FanMgmt
Section 6.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
Page
Input Pin Description
132
Output Pin Description
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FanMgmt
Input Pin Description
Pin Diagram
The following picture shows the pin diagram of FanMgmt:
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FanMgmt
Input Pin Description
Input
Data Type
Range
Scaling / Unit Description
EnableIn
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Enables the function block
FALSE: Disables the function block
FanControlSignal
CJ_WORD
0...32767
0.1 Hz
Input signal for fan control
FanReqNb
CJ_BYTE
1...12
N/A
Actual requested number of fans to
be controlled
Fan01Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan1 alarm is active
FALSE: Fan1 alarm is not active
Fan02Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan2 alarm is active
FALSE: Fan2 alarm is not active
Fan03Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan3 alarm is active
FALSE: Fan3 alarm is not active
Fan04Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan4 alarm is active
FALSE: Fan4 alarm is not active
Fan05Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan5 alarm is active
FALSE: Fan5 alarm is not active
Fan06Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan6alarm is active
FALSE: Fan6 alarm is not active
Fan07Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan7 alarm is active
FALSE: Fan7 alarm is not active
Fan08Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan8 alarm is active
FALSE: Fan8 alarm is not active
Fan09Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan9 alarm is active
FALSE: Fan9 alarm is not active
Fan10Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan10 alarm is active
FALSE: Fan10 alarm is not active
Fan11Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan11 alarm is active
FALSE: Fan11 alarm is not active
Fan12Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Fan12 alarm is active
FALSE: Fan12 alarm is not active
LowNoiseOper
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Low noise operation
activates
FALSE: Low noise operation
deactivates
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FanMgmt
Parameter Description
The parameters FanMaxNb , FanMode and FanFreqMode are controlled parameters. Controlled
parameters can be changed, however the changes only become effective after a reset of the
function block.
Input
Data Type
Range
Scaling / Unit Description
FanMaxNb
CJ_BYTE
1...12
N/A
Maximum number of fans to be
controlled
Default: 6
FanMode
CJ_BYTE
0...1
N/A
Fan On/Off sequence mode
0 FIFO
1 Runtime
Default: 0
FanFreqMin
CJ_WORD
0...1000
0.1 Hz
VSD minimum frequency
Default: 200
FanFreqMax
CJ_WORD
0...1000
0.1 Hz
VSD maximum frequency
Default: 500
FanFreqMode
CJ_BYTE
0...3
N/A
VSD frequency (fan speed)
calculation mode
0 Manual mode
1 Auto mode
2 Advanced control manual
saturation mode
3 Advanced control auto saturation
mode
FanManualFreq[12]
Array [12] of
CJ_WORD
0...1000
0.1 Hz
Fan manual frequency
FanSaturationFreqPerc
CJ_WORD
0...1000
0.1%
VSD saturation frequency level
percentage
Default: 100
LowNoiseFreqReduction
CJ_WORD
0...1000
0.1 Hz
VSD low noise operation frequency
reduction
Default: 100
FanDelayIncr
CJ_WORD
3...3600
1 sec
Delay in incrementing the running
number of fans
Default: 400
FanDelayDecr
CJ_WORD
3...3600
1 sec
Delay in decrementing the running
number of fans
Default: 400
FanDelayCmd
CJ_WORD
1...60
1 sec
Delay between fan
increment/decrement and fan
command
Default: 15
Default: 1
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Input
Data Type
Range
Scaling / Unit Description
FanDelayFreq
CJ_WORD
1...60
1 sec
Delay between fan command On/Off
and setting new frequency
Default: 5
FanMaintInterval
CJ_WORD
0...65000
1 Hrs
Fan maintenance alert hours.
Default: 5000
0 = alert disabled
FanOperHoursRst[12]
Array [12] of
CJ_BIT
TRUE or
FALSE
N/A
Reset for Fan1...12 operation hours
Resets at rising edge
FanMaintAlertRst[12]
Array [12] of
CJ_BIT
TRUE or
FALSE
N/A
Reset for Fan1...12 maintenance
alert
Resets at rising edge
FanOperHoursRst[12]
The rising edge of FanOperHoursRst[n] resets FanOperHours[n] to 0 and the alert related
to FanOperHours[n] is reset to FALSE.
The array index 0 corresponds to fan 1 and index 1 corresponds to fan 2 and accordingly for the
other fans.
FanMaintAlertRst[12]
The rising edge of FanMaintAlertRst[n] resets fan [n+1] maintenance alert.
The array index 0 corresponds to fan 1 and index 1 corresponds to fan 2 and accordingly for the
other fans.
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FanMgmt
FanManualFreq[12]
Array Index Number
Range
Scaling / Unit
Description
0
0...1000
0.1 Hz
Fan manual frequency when 1 fan is running
Default: 440
1
0...1000
0.1 Hz
Fan manual frequency when 2 fans are running
Default: 330
2
0...1000
0.1 Hz
Fan manual frequency when 3 fans are running
Default: 293
3
0...1000
0.1 Hz
Fan manual frequency when 4 fans are running
Default: 275
4
0...1000
0.1 Hz
Fan manual frequency when 5 fans are running
Default: 264
5
0...1000
0.1 Hz
Fan manual frequency when 6 fans are running
Default: 257
6
0...1000
0.1 Hz
Fan manual frequency when 7 fans are running
Default: 251
7
0...1000
0.1 Hz
Fan manual frequency when 8 fans are running
Default: 248
8
0...1000
0.1 Hz
Fan manual frequency when 9 fans are running
Default: 244
9
0...1000
0.1 Hz
Fan manual frequency when 10 fans are running
Default: 242
10
0...1000
0.1 Hz
Fan manual frequency when 11 fans are running
Default: 240
11
0...1000
0.1 Hz
Fan manual frequency when 12 fans are running
Default: 238
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Output Pin Description
Output Pin Description
Output
Data Type
Range
EnableOut
CJ_BIT
TRUE or FALSE N/A
TRUE: Function block is enabled
FALSE: Function block is disabled
FanFreq
CJ_WORD
0...1000
Fan speed signal to VSD
Default: 0
FanActNb
CJ_BYTE
0...12
N/A
Number of fans actually running
FanActPerc
CJ_WORD
0...1000
0.1%
Percentage of fans running
Fan01Command
CJ_BIT
TRUE or FALSE N/A
Fan1 command
Fan02Command
CJ_BIT
TRUE or FALSE N/A
Fan2 command
Fan03Command
CJ_BIT
TRUE or FALSE N/A
Fan3 command
Fan04Command
CJ_BIT
TRUE or FALSE N/A
Fan4 command
Fan05Command
CJ_BIT
TRUE or FALSE N/A
Fan5 command
Fan06Command
CJ_BIT
TRUE or FALSE N/A
Fan6 command
Fan07Command
CJ_BIT
TRUE or FALSE N/A
Fan7 command
Fan08Command
CJ_BIT
TRUE or FALSE N/A
Fan8 command
Fan09Command
CJ_BIT
TRUE or FALSE N/A
Fan9 command
Fan10Command
CJ_BIT
TRUE or FALSE N/A
Fan10 command
Fan11Command
CJ_BIT
TRUE or FALSE N/A
Fan11 command
Fan12Command
CJ_BIT
TRUE or FALSE N/A
Fan12 command
Alert
CJ_BIT
TRUE or FALSE N/A
TRUE: Alert
FALSE: No alert
AlertID
CJ_WORD
0...65535
Alert ID (see page 138)
Default: 0
Alarm
CJ_BIT
TRUE or FALSE N/A
TRUE: Alarm
FALSE: No alarm
AlarmID
CJ_WORD
0...3
Alarm ID (see page 139)
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Scaling/Unit
0.1 Hz
N/A
N/A
Description
137
FanMgmt
Parameter Output Pin Description
Output
Data Type
Range
Scaling/Unit
Description
MaintAlertID
CJ_WORD
0...65535
N/A
Fan1...12 maintenance alert status
MaintAlertID.0
...MaintAlertID.11 corresponds to
respective fans 1...12.
FanOperHours[12]
Array [12] of
CJ_DWORD
0...71582788
1 Hr
Fan1...12 total operating hours
Array index 0...12 corresponds to
respective fans 1...12.
Version[2]
Array [12] of
CJ_BYTE
N/A
N/A
Version information of function block
Version[0] - Function block version
Version[1] - Function block revision
Alert ID Description
The AlertID output represents a value between 0 and 65535, whereby each bit represents an alert.
The bits and their description are described in the following table:
Alert Bit
Alert Description
Result
0
Parameter value is not set within the range specified in input
description table.
This alert is generated when any of the following conditions are
TRUE:
 FanControlSignal > 32767
 FanReqNb > 12
 FanFreqMin < 50
 FanFreqMax < 51
 FanFreqMax > 1000
 FanSaturationFreqPerc > 1000
 LowNoiseFreqReduction > 1000
 FanDelayIncr > 3600
 FanDelayDecr > 3600
 FanDelayCmd > 60
 FanDelayFreq > 60
 FanMaintInterval > 65000
 FanDelayIncr ≤FanDelayCmd + FanDelayFreq
 FanDelayDecr ≤FanDelayCmd + FanDelayFreq
Function is in operation with limited
performance
1
Fan1 alarm input is active
Fan1 is switched on, but does not
start.
2
Fan2 alarm input is active
Fan2 is switched on, but does not
start.
3
Fan3 alarm input is active
Fan3 is switched on, but does not
start.
4
Fan4 alarm input is active
Fan4 is switched on, but does not
start.
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Alert Bit
Alert Description
Result
5
Fan5 alarm input is active
Fan5 is switched on, but does not
start.
6
Fan6 alarm input is active
Fan6 is switched on, but does not
start.
7
Fan7 alarm input is active
Fan7 is switched on, but does not start
8
Fan8 alarm input is active
Fan8 is switched on, but does not
start.
9
Fan9 alarm input is active
Fan9 is switched on, but does not
start.
10
Fan10 alarm input is active
Fan10 is switched on, but does not
start.
11
Fan11 alarm input is active
Fan11 is switched on, but does not
start.
12
Fan12 alarm input is active
Fan12 is switched on, but does not
start.
13
Fan1 or 2 or 3...12 maintenance alert is active.
Alert for required maintenance
FanOperHours [0] or [1...11] ≥ FanMaintInterval) is TRUE.
14
More fans than the maximum number of fans are requested.
(FanReqNb > FanMaxNb) is TRUE.
The requested number of fans can not
switch on.
15
A controlled parameter has been changed, which requires a
machine restart. The new configuration parameter is effective
only after restart of the function block.
Present changes are not active.
Function block uses the previously set
values.
Alarm ID Description
The AlarmID output represents a value between 0 and 3, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Description
Result
0
Parameter value setting is not within the range specified in the
input description table.
This alarm is generated when one of the following conditions is
TRUE:
 FanMaxNb < 1 or FanMaxNb > 12
 FanMode > 1
 FanFreqMode > 3
 FanManualFreq [0] or [1] or [2...11] > FanFreqMax
 FanDelayCmd < 1
 FanDelayFreq > 1
 FanFreqMax < FanFreqMin
 FanManualFreq [0] or [1] or [2...11] < FanFreqMin
Function block is disabled.
1
The fan alarms Fan01Alarm...Fan12Alarm are active.
The fans are not operating.
2...5
Not used
N/A
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FanMgmt
Section 6.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm/Alert
Problem
Solution
AlarmID.0 TRUE
Invalid parameter value
1. Check the parameters ranges.
2. Set the values within the defined ranges.
AlarmID.1 TRUE
The fans 1...12 are not operating.
Reset the fan alarm inputs.
AlertID.0 TRUE
Invalid parameter value
Check the parameters against their ranges.
AlertID.1 TRUE
AlertID.2 TRUE
AlertID.3 TRUE
AlertID.4 TRUE
AlertID.5 TRUE
AlertID.6 TRUE
AlertID.7 TRUE
AlertID.8 TRUE
AlertID.9 TRUE
AlertID.10 TRUE
AlertID.11 TRUE
AlertID.12 TRUE
One of the fans 1...12 is not operating. Check OEM machine manual.
Also check the following points:
 Enable function block.
 Check fan alarm inputs.
 Wait until the time of still active timers has
elapsed.
 Check the number of fans set in FanMaxNb.
AlertID.13 TRUE
Alert for maintenance task
Maintain the fan and then reset.
AlertID.14 TRUE
Different setting for FanMaxNb
Check the number of fans set in FanMaxNb.
The setting must be conform with the setting of the
function block FloatingHighPresCntrl.
AlertID.15 TRUE
Controlled parameters are changed
Restart the function block.
140
Reset the fan alarm inputs when the problem has
been solved.
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SoHVAC
FloatingHighPresCntrl
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Chapter 7
Floating High Pressure Control: FloatingHighPresCntrl
Floating High Pressure Control: FloatingHighPresCntrl
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
7.1
Functional and Machine Overview
142
7.2
Architecture
146
7.3
Function Block Description
149
7.4
Pin Description
154
7.5
Troubleshooting
162
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FloatingHighPresCntrl
Section 7.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
142
Page
Functional Overview
143
Machine Overview
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FloatingHighPresCntrl
Functional Overview
Functional Description
High variations of the refrigerant pressure can result in a high energy consumption of the
condensing fans and compressors.
The FloatingHighPresCntrl (Floating High Pressure Control) function block controls the
condensing pressure by modulating air volume through the condenser.
The air volume is controlled by the number and the speed of the condenser fans.
Why Use the FloatingHighPresCntrl Function Block?
The FloatingHighPresCntrl function block is used for the following purposes:
Purpose
Description
High pressure control
 maintain a constant high pressure
 avoid high pressure alarms
 feature that helps to protect the compressor in case of a
detected failure
Features of the FloatingHighPresCntrl Function Block
The FloatingHighPresCntrl function block provides the following features:
sets the floating condensing temperature based on outdoor air temperature
 supports standard refrigerant types R404A, R22, R410A, R407C, R134
 supports user defined refrigerant type
 supports temperature units ° C and ° F
 supports pressure units Bar and PSI
 provides high pressure alarm monitoring
 handles sensor alarms
 supports PID control and deadband control
 supports initial VSD ramp

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FloatingHighPresCntrl
Protective Features
The FloatingHighPresCntrl function block provides the following protective features to help
you avoid the potentials of certain sources of machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of range data from
being accepted directly.
Alarm-/alert notification
If you enter an invalid value, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with reduced performance
In case of a high pressure alarm or when the high pressure sensor is
disconnected or short-circuited, the fans will be started with maximum
frequency.
Controlled parameter
144
Parameters like UnitType, RefrType, RefrConstantB1...
RefrConstantB5 and FanMaxNb are controlled.
The configuration of these parameters can be changed, however the changes
are effective only after the restart of the function block.
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FloatingHighPresCntrl
Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
FloatingHighPresCntrl This function block monitors the internal pressure of the refrigerant (using a high
pressure sensor) and the external outdoor air temperature and operates the fan motors in association with
the FanMgmt function block.
FanMgmt This function block controls the optimum number of fans and the frequency depending on the
required air flow in the machine. FanMgmt manages the switch On/Off of fans.
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FloatingHighPresCntrl
Section 7.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
146
Page
Hardware Architecture
147
Software Architecture
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Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture for the FloatingHighPresCntrl function
block associated with Air Cooled Chiller.
1
2
3
4
5
6
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Soft starters
Motor Control
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FloatingHighPresCntrl
Software Architecture
Function Block Diagram
The following function block diagram provides an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables,on the right hand
side the outputs, the Process Commands, as well as the function block
FloatingHighPresCntrl.
The following table provides an overview of the functions of FloatingHighPresCntrl:
Function
Description
Setpoint Calculation
calculates and limits the setpoint between the input parameters
CondensingTempMin and CondensingTempMax based on 3
modes:
 Fixed setpoint
 Floating setpoint
 External setpoint
Temperature Calculation
uses high refrigerant pressure measurement to calculate the
condensing temperature CondensingRefrTempCalc on the
basis of the refrigerant properties
Fan Calculation
 calculates the number of fans required for cooling by
incrementing and decrementing
 deadband is used to prevent oscillation
 ON/OFF Delays are used in order to allow reaction times and
help to protect the fans
Frequency Calculation
148
calculates the frequency for currently operating fans based on:
 Mode : Automatic or Manual
 Fan minimum/maximum frequency
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Section 7.3
Function Block Description
Function Block Description
FloatingHighPresCntrl Function Block
Function Block Description
The FloatingHighPresCntrl function block calculates the number of fans and the variable fan
speed frequency required to control the high pressure refrigerant. The condensing refrigerant
pressure setpoint can be calculated by means of 3 different algorithms. The condensing refrigerant
temperature is calculated based on the refrigerant type and the measured refrigerant pressure.
If...
Then...
FloatingHighPresCntrl is used
with the function block FanMgmt
 it is possible to start and stop individual fans.
 the fans operate with the same frequency.
FloatingHighPresCntrl is used
without the function block FanMgmt
the fans operate with the same frequency.
FloatingHighPresCntrl provides the following methods for calculation and monitoring:
Refrigerant Setpoint Calculation
 Refrigerant Temperature Calculation
 Custom Refrigerant
 Frequency Calculation
 Fan Number Calculation
 Failure Management

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FloatingHighPresCntrl
High Pressure Refrigerant Temperature Setpoint Calculation
The FloatingHighPresCntrl function block calculates the high pressure refrigerant
temperature setpoint by means of 3 algorithms:
 Fixed
 Floating
 External
The algorithm type is selected by means of the parameter CondensingRefrControlMode.
The following table provides an overview of the 3 setpoints:
Setpoint
Description
Fixed
 CondensingRefrControlMode = 0
 The fixed condensing refrigerant temperature setpoint is calculated on the basis of
the actual outdoor air temperature and a fixed offset (CondensingTempOffset)
 The condensing refrigerant temperature setpoint is limited between
CondensingTempMin and CondensingTempMax
 Setpoint = OutdoorAirTemperature + Fixed Offset
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Setpoint
Description
Floating
 CondensingRefrControlMode = 1
 The floating condensing refrigerant temperature setpoint is calculated on the basis of
the actual outdoor air temperature, where CondensingTempMin is related to
OutdoorAirTempMin and CondensingTempMax is related to
OutdoorAirTempMax.
 The condensing refrigerant temperature setpoint is limited between
CondensingTempMin and CondensingTempMax
 Setpoint = OutdoorAirTemperature + Floating Offset
External
 CondensingRefrControlMode = 2
 The external setpoint (CondensingRefrTempSetp) is constant and is provided by
the input CondensingRefrPressSetp.
 The condensing refrigerant temperature setpoint is limited between
CondensingTempMin and CondensingTempMax.
 Setpoint = External Signal
 CondensingRefrTempCalc = CondensingRefrPressSetp
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FloatingHighPresCntrl
Refrigerant Temperature Calculation
The CondensingRefrTempSetp is calculated based on the high pressure sensor and the
selected refrigerant using the following formula:
T = B1 + B2 * log10(P) + B3 * (log10(P))2 + B4 * (log10(P))3 + B5 * (log10(P))4
P Pressure in [Bar a]
T Temperature in Celsius
B1, B2, B3, B4 and B5 are constants that depend on the refrigerant type given in the table below:
R22
R134A
R404A
R407C
R410A
RefrConstB1
–41.10425869
–26.37946503
–45.74988525
–36.95702568
–51.60743016
RefrConstB2
48.89832922
50.13044937
47.41656370
46.68436482
44.99525658
RefrConstB3
11.99963375
12.16844634
11.91636989
11.62881244
10.54782301
RefrConstB4
3.105357382
2.999009085
3.61190183
3.071138961
3.180095913
RefrConstB5
0.5586195324
0.4918984867
0.1771736352
–0.009987598837
0.1939419122
Pressure range
0.1 to 49 Bar
0.02 to 32 Bar
0.2 to 37 Bar
0.1 to 45 Bar
0.2 to 48 Bar
Precision
< 0.1° C
< 0.1° C
< 0.1° C
< 0.1° C
< 0.1° C
The temperature calculation depends on the measuring unit of pressure. The input pin Unit Type
is used to select between SI units (° C/Bar) or US units (° F/PSI).
Unit
Description
SI units
 Input CondensingRefrPress is set in Bar
 Output CondensingRefrTempCalc is calculated in ° C
 Output CondensingRefrTempSetp is calculated in ° C
US units
In case of US units:
 Input CondensingRefrPress is set in PSI
 Output CondensingRefrTempCalc is calculated in ° F
 Output CondensingRefrTempSetp is calculated in ° F
Custom Refrigerant
The FloatingHighPresCntrl function block supports the use of custom refrigerant. For this
purpose set RefrType to Custom=6
The refrigerant constants are provided by the parameters RefrConstant1 to RefrConstant5.
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Frequency Calculation
The FloatingHighPresCntrl function block supports 2 modes of frequency calculation:
Mode
Description
Auto
In auto mode the fan frequency calculation is based on the internal
PID controller
Manual
In manual mode the frequency is based on the parameter
ManualFreq.
NOTE: If FloatingHighPresCntrl is used with the function block FanMgmt, the manual
operation must set in Fan Management Control.
Fan Number Calculation
The FloatingHighPresCntrl function block calculates the number of fans required for cooling
by incrementing and decrementing. The number of fans is limited between 0 and the maximum
number of fans.
Mode
Description
Increment
 The number of fans is incremented by 1 if the condensing
temperature is greater than the condensing temperature
setpoint + deadband / 2.
 The timer delay for switching On the next fan starts and during
this time delay no additional fans are switched On.
Decrement
 The number of fans is decremented by 1 if the condensing
temperature is less than condensing temperature setpoint –
deadband / 2.
 The timer delay for switching Off the next fan starts and during
this time delay no additional fans are switched Off.
Failure Management
An alarm informs you when condensing refrigerant pressure and outdoor air temperature sensor
inputs are missing or short-circuited.
In case of an CondensingPressAlarm, the fan number and the fan frequency are set to
maximum.
The output AlarmID indicates which alarm occurs.
The output AlertID indicates which alert occurs.
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Section 7.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
154
Page
Input Pin Description
155
Output Pin Description
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Input Pin Description
Pin Diagram
The following picture shows the pin diagram of FloatingHighPresCntrl:
Input Pin Description
Input
Data Type
Range
Scaling/Unit
Description
EnableIn
CJ_BIT
TRUE or FALSE
N/A
TRUE: Enables the
function block.
FALSE: Disables the
function block.
CondensingRefrPress
CJ_ANALOG
N/A
0.01 Bar
0.1 PSI
Condensing refrigerant
pressure
OutdoorAirTemp
CJ_ANALOG
N/A
0.1° C/° F
Outdoor air
temperature
CondensingRefrTempSetp
CJ_SHORT
N/A
0.1° C/° F
Condensing refrigerant
temperature setpoint
CondensingPressAlarm
CJ_BIT
TRUE or FALSE
N/A
Condensing pressure
alarm
High Pressure Alarm is a safety device and indicates an alarm when the pressure exceeds a
maximum limit.
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FloatingHighPresCntrl
DANGER
REFRIGERANT POISONING OR FREEZER BURNS


Stop the compressor operation in case of a high pressure alarm.
Interlock the high pressure alarm switch with the compressors using contactors in the electrical
cabinet.
Failure to follow these instructions will result in death or serious injury.
Parameter Description
The parameters UnitType, RefrType, RefrConstantB1, RefrConstantB2,
RefrConstantB3, RefrConstantB4, RefrConstantB5 and FanMaxNb are controlled
parameters. Controlled parameters can be changed, however the changes only become effective
after a reset of the function block.
Input
Data Type
Range
Scaling/Unit
Description
CondensingTempOffset
CJ_SHORT
0...140
0.1° C/° F
Condensing
temperature offset
Default: 100
OutdoorAirTempMin
CJ_SHORT
–580...3020
0.1° C/° F
Minimum outdoor air
temperature
Default: 150
OutdoorAirTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Maximum outdoor air
temperature
Default: 300
CondensingTempMin
CJ_SHORT
–580...3020
0.1° C/° F
Minimum condensing
temperature
Default: 300
CondensingTempMax
CJ_SHORT
–580...3020
0.1° C/° F
Maximum condensing
temperature
Default: 500
RefrType
CJ_BYTE
1...6
N/A
Refrigerant type
1 R404A
2 R22
3 R410A
4 R407C
5 R134A
6 Custom
Pb
CJ_WORD
1...500
0.1
Pb fan control
Ti
CJ_WORD
0...3600
1 sec
Ti fan control
Td
CJ_WORD
0...3600
1 sec
Td fan control
Default: 1
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Input
Data Type
Range
Scaling/Unit
Description
Deadband
CJ_WORD
0...500
0.1
Deadband condensing
temperature
Default: 20
DelayNextFanOn
CJ_WORD
0...3600
sec
Delay next fan On
Default: 600
DelayNextFanOff
CJ_WORD
0...3600
sec
Delay next fan Off
Default: 600
CondensingRefrControlMode
CJ_BYTE
0...2
1
Condensing refrigerant
pressure control type
0 Fixed
1 Floating
2 External setpoint
FanMaxNb
CJ_BYTE
0...12
1
Maximum number of
fans
Default: 6
FanFreqMin
CJ_WORD
0...1000
0.1 Hz
VSD minimum
frequency
Default: 200
FanFreqMax
CJ_WORD
0...1000
0.1 Hz
VSD maximum
frequency
Default: 500
AccelerationRampMax
CJ_SHORT
0.1...100
0.1 Hz/sec
Ramp time from start to
target frequency
Default: 20
ManualMode
CJ_BIT
TRUE or FALSE
N/A
TRUE: Frequency
calculation manual
mode
FALSE: Frequency
calculation auto mode
Default: FALSE
ManualFreq
CJ_WORD
0...1000
0.1 Hz
Frequency in manual
mode
RefrConstantB1
CJ_LONG
–2,147,483,648
...2,147,483,647
0.001
Custom refrigerant
constant B1
RefrConstantB2
CJ_LONG
–2,147,483,648
...2,147,483,647
0.001
Custom refrigerant
constant B2
RefrConstantB3
CJ_LONG
–2,147,483,648
...2,147,483,647
0.001
Custom refrigerant
constant B3
RefrConstantB4
CJ_LONG
–2,147,483,648
...2,147,483,647
0.001
Custom refrigerant
constant B4
RefrConstantB5
CJ_LONG
–2,147,483,648
...2,147,483,647
0.001
Custom refrigerant
constant B5
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Input
Data Type
Range
Scaling/Unit
Description
CondensingRefrPressMaxLimit
CJ_SHORT
0...14500
0.01 Bar
0.1 PSI
Condensing refrigerant
pressure maximum
alarm limit
Default: 2000
CondensingRefrPressMinLimit
CJ_SHORT
0...14500
0.01 Bar
0.1 PSI
Condensing refrigerant
pressure minimum
alarm limit
Default: 700
UnitType
CJ_BIT
TRUE or FALSE
N/A
Unit selection bit
TRUE: ° F/PSI
FALSE: ° C/Bar
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling/
Unit
Description
EnableOut
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Function block is enabled
FALSE: Function block is disabled
FanFreq
CJ_WORD
FanFreqMin to 0.1 Hz
FanFreqMax
VSD fan speed signal
FanReqNb
CJ_BYTE
0 to FanMaxNb
N/A
Number of fans
CondensingRefrTempCalc
CJ_SHORT
N/A
0.1° C/° F
Calculated condensing refrigerant
temperature
CondensingRefrTempSetp
CJ_SHORT
N/A
0.1° C/° F
Calculated condensing refrigerant
temperature setpoint
Alert
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Alert
FALSE: No alert
AlertID
CJ_WORD
0...15
N/A
Alert Id (see page 160)
Alarm
CJ_BIT
TRUE or
FALSE
N/A
TRUE: Alarm
FALSE: No alarm
AlarmID
CJ_WORD
0...15
N/A
Alarm Id (see page 161)
Output
Data Type
Range
Scaling/
Unit
Description
PIDOutput
CJ_WORD
0...1000
N/A
PID output
Version[2]
Array of 2
CJ_BYTE
N/A
N/A
Version information of the function
block
Version[0] - Function block version
Version[1] - Function block revision
Parameter Description
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AlertID Description
The AlertID output represents a value between 0 and 15, whereby each bit represents an alert. The
bits and their description are described in the following table:
Alert Bit
Alert Cause
Effect
0
Invalid parameter
(CondensingTempOffset < 0 or CondensingTempOffset > 140)
(OutdoorAirTempMin < –580 or OutdoorAirTempMin > 3020)
(OutdoorAirTempMax < –580 or OutdoorAirTempMax > 3020)
(CondensingTempMin < –580 or CondensingTempMin > 3020)
(CondensingTempMax < –580 or CondensingTempMax > 3020)
(Pb < 1 or Pb > 500)
(Ti < 0 or Ti > 3600)
(Td < 0 or Td > 3600)
(Deadband < 0 or Deadband > 500)
(DelayNextFanOn < 30 or DelayNextFanOn > 3600)
(DelayNextFanOff < 30 or DelayNextFanOff > 3600)
(FanFreqMin < 0 or FanFreqMin > 1000)
(FanFreqMax < 0 or FanFreqMax > 1000)
(AccelerationRampMax < 0 or AccelerationRampMax > 1000)
(CondensingRefrPressMaxLimit < 0 or
CondensingRefrPressMaxLimit > 14500)
(CondensingRefrPressMinLimit < 0 or
CondensingRefrPressMinLimit > 14500)
Function block
operates at limited
performance
1
High pressure refrigerant > HPR maximum pressure
(CondensingRefrPress > CondensingRefrPressMaxLimit)
Control mode stays in
normal condition.
2
High pressure refrigerant < HPR minimum pressure
(CondensingRefrPress < CondensingRefrPressMinLimit)
Control mode stays in
normal condition.
3
The change of a controlled parameter is not active. Changing a controlled
parameter requires a machine restart. The controlled configuration parameter
setting is effective only after restart of the function block.
Control mode stays in
normal condition, but
changes only take
effect after restart.
4 to 15
Not used
N/A
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Alarm ID Description
The AlarmID output represents a value between 0 and 15, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
0
Function block is
Invalid parameter range
(OutdoorAirTempMin ≥ OutdoorAirTempMax) or (CondensingTempMin disabled.
≥ CondensingTempMax)
(RefrType < 1 or RefrType > 6)
(CondensingRefrControlMode < 0 or
CondensingRefrControlMode > 2)
(FanMaxNb < 0 or FanMaxNb > 12)
(FanFreqMax < FanFreqMin)
1
Alarm due to analog input channel used for condensing refrigerant pressure
(CondensingRefrPress)
Number of fans and
fan frequency turns to
maximum level.
2
Alarm due to analog input channel used for outdoor air temperature
(OutdoorAirTemp)
All fans are started with
maximum frequency
3
Alarm due to condensing pressure
(CondensingPressAlarm)
All fans are started with
maximum frequency
4 to 15
Not used
N/A
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FloatingHighPresCntrl
Section 7.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm/Alert
Problem
Solution
AlertID.0 TRUE
Invalid parameter values
1. Check the parameter values against
their ranges.
2. Set the values within the defined
ranges.
AlertID.1 TRUE
High pressure refrigerant
temperature sensor exceeds the
maximum limit.
Check the values of
CondensingRefrPress and
CondensingRefrPressMaxLimit.
AlertID.2 TRUE
Check the values of
High pressure refrigerant
temperature sensor falls below the CondensingRefrPress and
CondensingRefrPressMinLimit.
minimum limit.
AlertID.3 TRUE
Latched parameter values are
changed
Restart the function block.
AlarmID.0 TRUE
Invalid parameter values
1. Check the parameter values against
their ranges.
2. Set the values within the defined
ranges.
AlarmID.1 TRUE
Alarm due to the analog input
channel used for high pressure
refrigerant
Check if the CondensingRefrPress
sensor is connected to the controller and
working properly.
AlarmID.2 TRUE
Outdoor air temperature sensor is
short-circuited or disconnected
Check if the outdoor temperature sensor is
connected to the controller and working
properly.
AlarmID.3 TRUE
High pressure alarm
(CondensingPressAlarm)
1. Set the number of fans and fan
frequency to the defined level.
2. Check the high pressure refrigerant
temperature.
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FloatingSetpoint
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Chapter 8
Floating Setpoint: FloatingSetpoint
Floating Setpoint: FloatingSetpoint
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
8.1
Functional and Machine Overview
164
8.2
Architecture
165
8.3
Function Block Description
168
8.4
Pin Description
172
8.5
Troubleshooting
177
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FloatingSetpoint
Section 8.1
Functional and Machine Overview
Functional and Machine Overview
Functional Overview
Functional Description
The FloatingSetpoint function block is a general purpose function block to generate linear
scaled output using a linear conversion function.
Y-Y1=m(X-X1)
FloatingSetpoint is a generic function block that is independent of machines and their
hardware architecture.
Why Use the FloatingSetpoint Function Block?
The FloatingSetpoint function block allows to apply a different offset for every input value.
The two main reasons for using the FloatingSetpoint function block are:
The FloatingSetpoint function block is used to convert the analog input signal into a
normalized output.
 The FloatingSetpoint function block is used to convert the data values from one
engineering unit to other engineering units where there is a linear relation between the
engineering units.

Features of the FloatingSetpoint Function Block
The FloatingSetpoint function block provides the following features:
 limits the output between parameters by means of the parameter LimitOutput.
 enables a reverse action for sensors that are reverse working by means of the parameter
DirectReverse
 linear conversion
Protective Features
The FloatingSetpoint function block provides the following protective features to help you
avoid the potentials of certain sources of machine malfunction:
164
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to avoid out of range data from
being accepted directly.
Alarm/alert notification
If you enter an invalid value, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with reduced performance
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Section 8.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
Page
Hardware Architecture
166
Software Architecture
167
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FloatingSetpoint
Hardware Architecture
Hardware Architecture
FloatingSetpoint is a generic function block that is independent of machines and their
hardware structure.
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Software Architecture
Function Block Diagram
The following function block diagram gives you an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables,on the right hand
side the outputs, the Process Commands, as well as the function block FloatingSetpoint.
The following table gives you an overview of the functions of FloatingSetpoint:
Function
Description
Scaling
Generates linear scaled output by means of linear equations.
Limit
Sets limit values, that allow to limit the output.
Direct/Reverse Output
Reverses the output Y.
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FloatingSetpoint
Section 8.3
Function Block Description
Function Block Description
FloatingSetpoint Function Block
Function Block Description
The FloatingSetpoint function block generates linear scaled output Y for the given analog
input X.
LimitOutput
The output Y can be limited between the parameters Y1 and Y2. To enable this function, set the
parameter LimitOutput to TRUE. If the parameter LimitOutput is set to FALSE, the output is
not limited.
In this case the output Y is a direct function of the input X.
LimitOutput enabled (TRUE) and DirectReverse disabled (FALSE)
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LimitOutput disabled (FALSE) and DirectReverse disabled (FALSE)
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DirectReverse
Some sensor devices are reverse working. An increase in pressure decreases the current.
If the parameter DirectReverse is set to TRUE, reverse action is enabled. In this case the output
Y is a reverse scaled output of the input X.
When DirectReverse is TRUE, the output Y is calculated using the formula: Y – Y2 = m(X - X1),
where m = (Y2 – Y1) / (X2 – X1).
If the parameter DirectReverse is set to FALSE, the function block operates in direct mode. In
this case the output Y is directly scaled output of X.
When DirectReverse is FALSE, the output Y is calculated using the formula: Y – Y1 = m(X X1), where m = (Y2 – Y1) / (X2 – X1).
LimitOutput enabled (TRUE) and DirectReverse enabled (TRUE)
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LimitOutput enabled (FALSE) and DirectReverse disabled (TRUE)
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FloatingSetpoint
Section 8.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
172
Page
Input Pin Description
173
Output Pin Description
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FloatingSetpoint
Input Pin Description
Pin Diagram
The following picture shows the pin diagram of FloatingSetpoint:
Input Pin Description
Input
Data Type
Range
Scaling/Unit
Description
EnableIn
CJ_BIT
TRUE or FALSE
N/A
TRUE: Enables the function
block and scaling.
FALSE: Disables the function
block and Y = X.
X
CJ_ANALOG
N/A
0.1
Analog input to be scaled.
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Parameter Description
Parameter
Data Type
Range
Scaling/Unit
Description
X1
CJ_SHORT
–32768...32767
0.1
Limit X1 value
Default: 200
X2
CJ_SHORT
–32768...32767
0.1
Limit X2 value
Default: 300
Y1
CJ_SHORT
–32768...32767
0.1
Limit Y1 value
Default: 400
Y2
CJ_SHORT
–32768...32767
0.1
Limit Y2 value
Default: 500
LimitOutput
CJ_BIT
TRUE or FALSE
N/A
TRUE: Output Limiting enabled
FALSE: Output Limiting
disabled
Default: FALSE
DirectReverse
CJ_BIT
TRUE or FALSE
N/A
TRUE: Reverse Output
FALSE: Direct Output
Default: FALSE
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling/Unit
Description
EnableOut
CJ_BIT
TRUE or FALSE
N/A
TRUE: Function block is enabled.
FALSE: Function block is disabled.
Y
CJ_SHORT
–32768...32767
0.1
Scaled output
This output is equal to X if the
function block is disabled.
Alert
CJ_BIT
TRUE or FALSE
N/A
TRUE: Function block alert
AlertID
CJ_WORD
0...1
N/A
Alert ID: Refer to the table below.
Alarm
CJ_BIT
TRUE or FALSE
N/A
TRUE: Function block alarm
AlarmID
CJ_WORD
0...2
N/A
Alarm ID: Refer to the table below.
Data Type
Range
Scaling/Unit
Description
PIDOutput
CJ_WORD
0...1000
N/A
PID output
Version[2]
Array of 2
CJ_BYTE
N/A
N/A
Version information of the function
block
Version[0] - Function block version
Version[1] - Function block revision
Parameter Description
Output
AlertID Description
The AlertID output represents a value between 0 and 1, whereby each bit represents an alert. The
bits and their description are described in the following table:
Alert Bit
Alert Cause
Effect
0
Calculated output for given values of X, X1, X2, Y1 and Y2
is out of range, hence previous output is retained.
Previous in range value of the
output is retained, which indicates
(Internal Y > 32767)
or (Internal Y < –32768)
1...15
Not used
N/A
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AlarmID Description
The AlarmID output represents a value between 0 and 2, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
Effect
0
X1 == X2
Output is set to 0
1
Alarm due to analog input X, that is X.Error <> 0
X analog input sensor is short
circuited or disconnected and
output is set to 0.
2...15
Not used
N/A
NOTE: A valid parameter input resets the alarm automatically.
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Section 8.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm/Alert
Problem
Solution
AlarmID.0 TRUE
Invalid parameter
configuration. Slope of the
linear function can not be
calculated. Parameter X1 and
X2 have identical values.
Check and correct parameter
values of X1 and X2, and make
sure they have different values.
AlarmID.1 TRUE
Analog channel error
Check the connected sensor for
short circuit, broken or
disconnected cable.
Output Y = 0
Alarm: TRUE
Check AlarmID
Output Y value does not change
Alarm.1 = TRUE
Output out of range.
Check values of parameter range.
Output = Input Scaling is not done
Function block is disabled.
Restart the function block.
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WtrTempDbCntrl
EIO0000000663 05/2014
Chapter 9
Water Temperature Deadband Control: WtrTempDbCntrl
Water Temperature Deadband Control: WtrTempDbCntrl
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
9.1
Functional and Machine Overview
180
9.2
Architecture
183
9.3
Function Block Description
186
9.4
Pin Description
195
9.5
Troubleshooting
200
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WtrTempDbCntrl
Section 9.1
Functional and Machine Overview
Functional and Machine Overview
What Is in This Section?
This section contains the following topics:
Topic
180
Page
Functional Overview
181
Machine Overview
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WtrTempDbCntrl
Functional Overview
Functional Description
The WtrTempDbCntrl function block calculates the number of compressors required to control
the chilled water temperature.
The WtrTempDbCntrl aims to ensure a correct and constant chilled water temperature. To
regulate the water temperature, this function block controls the compressors, associated with the
CompMgmt function block.
Why Use the WtrTempDbCntrl Function Block?
The WtrTempDbCntrl function block is used for the following purposes:
Purpose
Description
Water temperature control
 maintain a constant chilled water temperature
 calculate the required number of compressors
Features of the WtrTempDbCntrl Function Block
The WtrTempDbCntrl function block provides the following features:
 controls the chilled water temperature by switching the compressors on and off
 supports cooling and heating mode by reducing /increasing the number of compressors
 supports 1 or 2 refrigeration circuits
For a detailed description of the above features, please also refer to the chapter Function Block
Description. (see page 187)
Protective Features
The WtrTempDbCntrl function block provides the following protective features to help you avoid
the potentials of certain sources of machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to establish stable
operation.
Alarm-/alert notification
If an invalid value is entered, an alarm or an alert is generated:
 alarm: the machine is switched off
 alert: the machine keeps on operating, however with
reduced performance
If the chilled water sensor is short-circuited or disconnected,
WtrTempDbCntrl raises an alarm setting the number of
compressors to 0.
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WtrTempDbCntrl
Machine Overview
Machine View
The following picture shows the interaction between the function block and the machine:
WtrTempDbCntrl This function block controls the chilled water temperature, calculates the required number
of compresssors and sends a request to the CompMgmt function block.
CompMgmt This function block controls up to 4 compressors and manages the switch On/Off of compressors.
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Section 9.2
Architecture
Architecture
What Is in This Section?
This section contains the following topics:
Topic
Page
Hardware Architecture
184
Software Architecture
185
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WtrTempDbCntrl
Hardware Architecture
Hardware Architecture Overview
The figure below shows the hardware architecture for the WtrTempDbCntrl function block
associated with Air Cooled Chiller.
1
2
3
4
5
6
184
Main power supply
M168 Controller
M168 Graphic display
Variable speed drive ATV••/••• Modbus
Soft starters
Motor Control
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WtrTempDbCntrl
Software Architecture
Function Block Diagram
The following function block diagram provides an overview of the software architecture:
The block diagram shows on the left hand side the inputs, the Process Variables, on the right
hand side the outputs, the Process Commands, as well as the function block WtrTempDbCntrl.
The following table provides an overview of the functions of WtrTempDbCntrl:
Function
Description
PID
(Proportional Integral
Derivative)
aims to get PID output at desired value:
 short-term
 with minimal overshoot
 stable
Compressor Calculation
determines the required number of compressors
Compressor calculation is based on:
 PID output
 On/Off Delay time
 Deadband
 Mode
On/Off Delay
 On Delay helps to prevent further increase for the set time.
 Off Delay helps to prevent further decrease for the set time.
Deadband
Deadband is a signal range without any actions occurring. The
purpose is to:
 help prevent oscillation
 help prevent repeated On/Off cycles
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WtrTempDbCntrl
Section 9.3
Function Block Description
Function Block Description
What Is in This Section?
This section contains the following topics:
Topic
186
Page
WtrTempDbCntrl Function Block
187
Timing Diagram
190
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WtrTempDbCntrl Function Block
Function Block Description
The WtrTempDbCntrl function block controls the chilled water temperature by controlling the
number of compressors, activating or deactivating them according to the desired temperature.
In cooling mode, an increased number of compressors will decrease the chilled water temperature.
In heating mode, an increased number of compressors will increase the chilled water temperature.
The output number of compressors is limited between 0 and the value defined by the parameter
for the number of compressors CompMaxNb.
The function block WtrTempDbCntrl provides the following features:
 Cooling and Heating mode
 PID Control
 Timer Delay
 Failure Management
Cooling and Heating Mode
The heating-cooling mode is changed by the input CoolingHeatingMode. The changes are
applied when the function block is restarted which means a rising edge of EnableIn.
The following table gives you an overview of the cooling and heating mode:
Mode
Description
Cooling mode
 The number of compressors is incremented when the chilled water
temperature is above chilled water temperature set point + Pb/2 and
PID control signal is 0%.
 The number of compressors is decremented when the chilled water
temperature is below chilled water temperature set point –Pb/2 and
PID control signal is 100%.
Heating mode
 The number of compressors is decremented when the chilled water
temperature is above chilled water temperature set point + Pb/2 and
PID control signal is 0%.
 The number of compressors is incremented when the chilled water
temperature is below chilled water temperature set point - Pb/2 and
PID control signal is 100%.
If the deadband is set to 0, the control is purely PID control.
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WtrTempDbCntrl
The figure below shows the relation between PID control and deadband for cooling mode:
PID Control
The intention of PID Control is to maintain an output at a desired value.
The output of PID Control is normalized to the linear portion of the proportional band.
Example:
 Valve fully closed = 0%
 Valve fully open = 100%
When the PID output is 100% or 0%, the Compressor Calculation increases or decreases the
number of compressors.
The following types relating to PID and Deadband control are possible:
188
Type
Description
Purely Deadband control
The parameter deadband must be set equal or higher than the
parameter Pb.
The switch on and off conditions of compressors depend on the
chilled water temperature being inside or outside the deadband
range.
Combination PID +
Deadband control
The parameter deadband is set between 0 and the value of parameter
Pb.
The switch on and off conditions of compressors depend on the
chilled water temperature being outside the deadband range and
fulfilling the requirement of PID control.
This type of control is very useful when a relative large proportional
band is required for stable control and compressors are not allowed
to switch on and off when the chilled water temperature deviation is
very small, for example. within +/- 2K from control setpoint.
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Timer Delay
The timer delay parameter DelayNextCompOn starts when the number of compressors is
incremented.
The following table provides an overview of the timers:
Timer
Description
DelayNextCompOn
The timer delay next compressor On is started when the
number of compressors is incremented.
No other compressor can be switched on when the timer delay
next compressor On is active.
DelayNextCompOff
The timer delay next compressors Off is started when the
number of compressors is decremented.
No other compressor can be switched off when the timer delay
next compressor Off is active.
Failure Management
The function block raises an alarm when the sensor input ChilledWaterTemp indicates a
missing or short-circuited sensor. The function block can not operate without this sensor. In this
alarm situation all compressors are switched off.
The function block checks that the sensor input value is within the set limits. When the set limits
are exceeded, an alert is generated:
 ChilledWaterTemp > ChilledWaterTempMaxLimit alarm, Hysteresis = 10 (fixed value)
 ChilledWaterTemp < ChilledWaterTempMinLimit alarm, Hysteresis = 10 (fixed value)
In this alert situation the control module remains in normal operation.
The output AlarmID and AlertID indicates the alarm or alert, whenever an alarm or alert occurs.
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Timing Diagram
WtrTempDbCntrl Function Block in Heating Mode
The timing diagram below shows the heating mode of WtrTempDbCntrl function block:
The following table explains the steps of the above graphic:
190
Step
Description
1
Machine is started and ChilledWaterTemp is outside the control band
(ChilledWaterTempSetp +/- Pb/2).
The number of requested compressors is incremented.
2
The DelayNextCompOn timer is started when the number of compressors is incremented.
No additional compressors will be started as long as the timer is active.
3
After expiration of the DelayNextCompOn timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is outside the control band (ChilledWaterTempSetp +/- Pb/2), the
number of requested compressors is incremented.
4
The DelayNextCompOn timer is started when the number of compressors is incremented.
No additional compressors will be started as long as the timer is active.
5
After expiration of the DelayNextCompOn timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is now inside the control band (ChilledWaterTempSetp +/- Pb/2),
the number of requested compressors is not changed.
6
The ChilledWaterTemp is outside the control band (ChilledWaterTempSetp +/- Pb/2).
The number of requested compressors is decremented.
7
The DelayNextCompOff timer is started when the number of compressors is decremented.
No additional compressors will be started as long as the timer is active.
8
After expiration of the DelayNextCompOff timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is now inside the control band (ChilledWaterTempSetp +/- Pb/2),
the number of requested compressors is not changed.
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WtrTempDbCntrl Function Block in Cooling Mode
The timing diagram below shows the cooling mode of WtrTempDbCntrl function block:
The following table explains the step of the above graphic:
Step
Description
1
Machine is started and ChilledWaterTemp is outside the control band
(ChilledWaterTempSetp +/- Pb/2).
The number of requested compressors is incremented.
2
The DelayNextCompOn timer is started when the number of compressors is incremented.
No additional compressors will be started as long as the timer is active.
3
After expiration of the DelayNextCompOn timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is outside the control band (ChilledWaterTempSetp +/- Pb/2), the
number of requested compressors is incremented.
4
The DelayNextCompOn timer is started when the number of compressors is incremented.
No additional compressors will be started as long as the timer is active.
5
After expiration of the DelayNextCompOn timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is now inside the control band (ChilledWaterTempSetp +/- Pb/2),
the number of requested compressors is not changed.
6
The ChilledWaterTemp is outside the control band (ChilledWaterTempSetp +/- Pb/2).
The number of requested compressors is decremented.
7
The DelayNextCompOff timer is started when the number of compressors is decremented.
No additional compressors will be started as long as the timer is active.
8
After expiration of the DelayNextCompOff timer, the ChilledWaterTemp is monitored.
As the ChilledWaterTemp is now inside the control band (ChilledWaterTempSetp +/- Pb/2),
the number of requested compressors is not changed.
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WtrTempDbCntrl
DelayNextCompOn
The following timing diagram below shows DelayNextCompOn:
The following table explains the steps of the above graphic:
Step
Description
1
The DelayNextCompOn timer is started when the number of compressors is
incremented.
No additional compressors will be started as long as the timer is active.
2
After expiration of the DelayNextCompOn timer, compressors can be switched on
depending on the chilled water temperature and PID control conditions.
DelayNextCompOff
The following timing diagram shows DelayNextCompOff:
The following table explains the steps of the above graphic:
192
Step
Description
1
The DelayNextCompOff timer is started when the number of compressors is
incremented.
No additional compressors will be stopped as long as the timer is active.
2
After expiration of the DelayNextCompOff timer, compressors can be switched
off depending on the chilled water temperature and PID control conditions.
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Dual Circuit Balancing
The following table shows an overview of Dual Circuit Balancing:
Parameter Input / Output
Operation
RefrCircSel (Parameter Input) - CJ_BYTE
RefrCircSel = 0
Operation with single refrigerant circuit, number of
compressor required will be at ComReqNbCkt1
output.
RefrCircSel = 1
Operation with dual refrigerant circuit 1 having
priority.
In sequence mode: the compressors in circuit 1 will
be ON, and then compressors in circuits 2 will be ON.
In balance mode for 1 compressor request:
compressor from circuit 1 will be ON, and for 2
compressor requests 1 compressor from circuit 2 will
be ON.
The same cycle is applicable when the compressor
request decrements.
RefrCircSel = 2
Operation with dual refrigerant circuit, with circuit 2
having priority.
In sequence mode: the compressors in circuit 1 and
in circuit 2 will be ON.
In balance mode for 1 compressor request,
compressor from circuit 2 will be ON and for 2
compressor requests, 1 compressor from circuit 1 will
be ON (accordingly: for 3 compressor requests,
another compressor from circuit 2 will be ON.
The same cycle is applicable when the compressor
request decrements.
RefrCircMode (Parameter Input) - CJ_BIT
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TRUE: sequence mode
The compressors in one circuit (circuit selection
according to RefrCircSel) will be ON, and then the
compressors in the other circuit will be ON.
This is applicable, when RefrCircSel is equal to 1
or 2.
FALSE: balance mode
In balance mode, 1 compressor in one circuit (circuit
selection will be set according to RefrCircSel will
be ON, and then 1 compressor in the other circuit will
be ON.
Then again, 1 compressor in the first circuit will be
ON.
This is applicable, when RefrCircSel is equal to 1
or 2.
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WtrTempDbCntrl
Parameter Input / Output
Operation
CompReqNbCkt1 (Output) - CJ_BYTE
Number of compressor request in circuit 1.
NOTE: When the single refrigerant circuit is used
(RefrCircSel = 0), then this output will be used for
the requested number of compressors.
CompReqNbCkt2 (Output) - CJ_BYTE
Number of compressor request in circuit 2.
NOTE: When the single refrigerant circuit is used
(RefrCircSel = 0), then this output will be 0.
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Section 9.4
Pin Description
Pin Description
What Is in This Section?
This section contains the following topics:
Topic
Page
Input Pin Description
196
Output Pin Description
198
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WtrTempDbCntrl
Input Pin Description
Pin Diagram
The following picture shows the pin diagram of WtrTempDbCntrl:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
EnableIn
CJ_BIT
TRUE or FALSE
N/A
TRUE: Enables the function
block.
FALSE: Disables the function
block.
ChilledWaterTemp
CJ_ANALOG
N/A
0.1° C/° F
Chilled water temperature
ChilledWaterTempSetp CJ_SHORT
–32768...32767
0.1° C/° F
Chilled water temperature
setpoint
CoolingHeatingMode
CJ_BIT
TRUE or FALSE
N/A
Cooling and heating mode
(see page 187)
TRUE: Heating mode
FALSE: Cooling mode
Default: FALSE
CompAvailNbCirc1
CJ_BYTE
0...255
N/A
Number of available
compressors in refrigerant circuit
1.
This input can be connected to
output CompMaxNbAvail of
CompMgmt
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Input
Data Type
Range
Scaling / Unit
Description
CompAvailNbCirc2
CJ_BYTE
0...255
N/A
Number of available
compressors in refrigerant circuit
2.
This input can be connected to
output CompMaxNbAvail of
CompMgmt
Parameter Description
Parameter
Data Type
Range
Scaling / Unit
Description
Pb
CJ_WORD
10 to 500
0.1
Proportional gain Pb for
compressor control
Default: 60
Ti
CJ_WORD
0...3600
1 sec
Integral gain Ti for
compressor control
Default: 0
Td
CJ_WORD
0...3600
1 sec
Derivative gain Td for
compressor control
Default: 0
Deadband
CJ_SHORT
0 to 500
0.1
Deadband chilled water
temperature
Default: 40
DelayNextCompOn
CJ_WORD
30...1200
1 sec
Delay next compressor On
(see page 189)
Default: 600
DelayNextCompOff
CJ_WORD
30...1200
1 sec
Delay next compressor Off
(see page 189)
Default: 600
ChilledWaterTempMaxLimit
CJ_SHORT
–580...3020
0.1° C/° F
Maximum chilled water
temperature
Default: 160
ChilledWaterTempMinLimit
CJ_SHORT
–580...3020
0.1° C/° F
Minimum chilled water
temperature
Default: 20
RefrCircSel
CJ_BYTE
0...2
N/A
0 = Single refrigerant circuit
1 = Dual refrigerant circuit,
priority on circuit 1
2 = Dual refrigerant circuit,
priority on circuit 2
RefrCircMode
CJ_BIT
TRUE or
FALSE
N/A
Mode selection for dual
refrigerant circuits
TRUE: Sequential mode
FALSE: Balanced mode
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Output Pin Description
Output Pin Description
Output
Data Type
Range
Scaling / Unit Description
EnableOut
CJ_BIT
TRUE or FALSE
N/A
CompReqNbCirc1
CJ_BYTE
0...CompAvailNbCirc1 N/A
Requested number of compressors in
circle 1
CompReqNbCirc2
CJ_BYTE
0...CompAvailNbCirc2 N/A
Requested number of compressors in
circle 2
Alert
CJ_BIT
TRUE or FALSE
N/A
Alert bit
AlertID
CJ_WORD
0...15
N/A
Alert ID (see page 199)
Alarm
CJ_BIT
TRUE or FALSE
N/A
Alarm bit
AlarmID
CJ_WORD
0... 3
N/A
Alarm ID (see page 199)
TRUE: Function block is enabled
FALSE: Function block is disabled
Parameter Description
Output
Data Type
Range
Scaling/Unit
Description
PIDOutput
CJ_WORD
0...1000
N/A
PID output
Version[2]
Array of 2
CJ_BYTE
N/A
N/A
Version information of the function
block
Version[0] - Function block version
Version[1] - Function block revision
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AlertID Description
The AlertID output represents a value between 0 and 15, whereby each bit represents an alert. The
bits and their description are described in the following table:
Alert Bit
Alert Cause
Effect
0
The conditions for invalid parameter range are as follows:
1. If ChilledWaterTempMaxLimit <
ChilledWaterTempMinLimit
2. If any of the following input parameters are beyond the range
Pb < 10 or Pb > 500
Ti < 0 or Ti > 3600
Td < 0 or Td > 3600
Deadband < 0 or Td > 500
DelayNextCompOn < 30 or DelayNextCompOn > 1200
DelayNextCompOff < 30 or DelayNextCompOff > 1200
ChilledWaterTempMaxLimit < –580 or
ChilledWaterTempMaxLimit > 3020
ChilledWaterTempMinLimit < –580 or
ChilledWaterTempMinLimit > 3020
Function block operates,
however with limited
performance.
1
Chilled water temperature ChilledWaterTemp > Maximum chilled
water temperature ChilledWaterTempMaxLimit with constant
hysteresis of 10
Compressor does not operate.
2
Chilled water temperature ChilledWaterTemp < Minimum chilled
water temperature ChilledWaterTempMinLimit with constant
hysteresis of 10
3
A controlled parameter has been changed, which requires a machine
restart. The new configuration parameter is effective only after the
restart of function block.
Present changes are not active.
Function block uses the
previously set values.
AlarmID Description
The AlarmID output represents a value between 0 and 3, whereby each bit represents a detected
alarm. The bits and their description are described in the following table:
Alarm Bit
Alarm Cause
Effect
0
Any of the following input parameter is beyond the range:
(CompMaxNb < 1 or
CompMaxNb > 4)
Function block is disabled.
1
ChilledWaterTemp sensor is short-circuited or disconnected.
Control is not possible. The
compressors are switched off.
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Section 9.5
Troubleshooting
Troubleshooting
Troubleshooting
Troubleshooting
Alarm/Alert
Problem
Solution
AlarmID.0 TRUE
Invalid parameter configuration
1. Check the parameters against their ranges.
2. Set the values within their defined ranges.
AlarmID.1 TRUE
Chilled water temperature sensor is
short-circuited or disconnected.
Check, if the chilled water temperature sensor is
connected to the controller.
AlertID.0 TRUE
Invalid parameter ranges
1. Check the parameters against their ranges.
2. Set the values within their defined ranges.
3. Check the delay time parameter and chilled
water temperature ranges.
4. Reset the compressors.
AlertID.1 TRUE
Chilled water temperature sensor
exceeds the maximum limit.
AlertID.2 TRUE
Chilled water temperature sensor falls
below the minimum limit.
1. Check, if compressors are operating.
2. Check correct mounting of temperature
sensor.
3. Check temperature limits.
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Thermal Power Calculation
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Chapter 10
Thermal Power Calculation: ThermalPowerCalculation
Thermal Power Calculation: ThermalPowerCalculation
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
10.1
Function Block Description
202
10.2
Pin Description
204
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Thermal Power Calculation
Section 10.1
Function Block Description
Function Block Description
ThermalPowerCalculation Function Block Description
Function Block Description
The ThermalPowerCalculation function block calculates the thermal power and the thermal
energy produced. The calculation of the thermal power of a hydraulic system is based on the mass
flow rate, the heat capacity of the medium, and the temperature difference before and after heat
dissipation.
The ThermalPowerCalculation function block may be used with the COPcalculation
function block (see page 207) to determine the machine efficiency, or may be used independently.
Why Use the ThermalPowerCalculation Function Block?
The ThermalPowerCalculation function block:
 simplifies programming.
 reduces engineering and commissioning time.
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Thermal Power Calculation
Features of the ThermalPowerCalculation Function Block
The ThermalPowerCalculation function block provides the following features:
 provides the instant thermal power and the total thermal energy.
 allows you to measure total thermal energy over a used-defined period.
 can work with metering devices providing either mass flow or volume flow information.
 provides thermal energy information in the right format to be used on the COPcalculation
function block (see page 207).
The thermal power is calculated based on the following formula:
For meters providing a volume flow, the mass flow is calculated according to:
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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Thermal Power Calculation
Section 10.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of the ThermalPowerCalculation function block:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xReset
CJ_BIT
TRUE or FALSE
N/A
Reset
shInputTemp
CJ_SHORT
–32768...32767
0.1° C (K)
Input temperature
shOutputTemp
CJ_SHORT
–32768...32767
0.1° C (K)
Output temperature
wFlow
CJ_WORD
0... 65535
0.1 kg/s
Mass flow
wHeatCap
CJ_WORD
0... 65535
0.1 kJ / (kg * K)
Heat capacity of the medium
wDensity
CJ_WORD
0... 65535
0.1
Density correction value (see the
values in the table for wDensity
below).
Default: 1.0
NOTE: A rising edge on the xReset input resets the energy calculation to 0.
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Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
dwThermalPower
CJ_DWORD
0...4294967295
0.001 kW
Actual thermal power
dwThermalEnergy
CJ_DWORD
0...4294967295
0.001 kWh
Accumulated thermal energy
wDensity
Depending on the flow type, the correction value is taken from the input wDensity. The table
shows the correction on the example of water and brine:
Flow
Unit
wDensity
Water (4° C)
wDensity
Brine (0° C / 25%)
Mass
kg/s
1
1.05
Volume
l/s
1 kg/l
Volume
m
Volume
m3/h
3/s
1000
1.05 kg/l
kg/m3
1000/3600 kg/m3
1050 kg/m3
1050/3600 kg/m3
Water (4° C): c = 4.205 kJ / (kg * K), p = 1 kg/l
Brine (0° C / 25%): c = 3.700 kJ / (kg * K), p = 1.05 kg/l
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Thermal Power Calculation
206
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SoHVAC
COPCalculation
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Chapter 11
Coefficient of Performance Calculation: COPCalculation
Coefficient of Performance Calculation: COPCalculation
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
11.1
Functional Overview
208
11.2
Pin Description
209
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COPCalculation
Section 11.1
Functional Overview
Functional Overview
COPCalculation Function Block Description
Function Block Description
The coefficient of performance (COP) indicates the efficiency of heating and cooling machines.
The higher the COP, the more efficient the machine operates.
The COP is defined by the ratio heat dissipation and electrical power intake.
The COPCalculation function block calculates the COP based on the following formula:
COP = thermal power (kW) / electrical power (kW)
Why Use the COPCalculation Function Block?
The COPCalculation function block:
simplifies programming.
 reduces engineering and commissioning time.
 provides proper functionality verified on real installations.

Features of the COPCalculation Function Block
The COPCalculation function block provides the following features:
 implements methods to calculate the instant machine COP.
 provides a short-term COP indicating the average COP over a duration of 5 min.
 calculates the average COP for a user-defined duration (seasonal COP).
 provides an input to reset all accumulated COP values and indicates the date of the last reset.
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
208
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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COPCalculation
Section 11.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of the COPCalculation function block:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xReset
CJ_BIT
TRUE or FALSE
N/A
Reset input to restart long-term
COP calculation.
dwElecPower
CJ_DWORD
0...4294967295
0.001 kW
Electrical power
dwCoolingPower
CJ_DWORD
0...4294967295
0.001 kW
Thermal power
dwElecEnergy
CJ_DWORD
0...4294967295
0.001 kWh
Electrical energy
dwCoolingEnergy
CJ_DWORD
0...4294967295
0.001 kWh
Thermal energy
dtRTCin
CJ_DATETIME
N/A
N/A
System date and time
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COPCalculation
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
wLongTermCOP
CJ_WORD
0...65535
0.01
Long-term COP (user-defined)
wShortTermCOP
CJ_WORD
0...65535
0.01
Short-term COP (sliding window
of 5 min)
wInstantCOP
CJ_WORD
0...65535
0.01
Instant COP
dtCOPLastReset
CJ_DATETIME
N/A
N/A
Date and time of last reset
wLongTermCOP
The output wLongTermCOP provides the average COP for a user-defined duration. The long-term
COP calculation is started with a rising edge on the xReset input. Before performing the reset to
start a new measurement period, archive the wLongTermCOP value by storing it to a separate
variable.
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Pulse2Counter
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Chapter 12
Totalizer for Digital Input Pulses: Pulse2Counter
Totalizer for Digital Input Pulses: Pulse2Counter
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
12.1
Functional Overview
212
12.2
Pin Description
214
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Pulse2Counter
Section 12.1
Functional Overview
Functional Overview
Pulse2Counter Function Block Description
Function Block Description
The function block Pulse2Counter counts the pulses provided by an energy meter. With the
Counter2Energy (see page 218) the counted values are converted to active power and energy.
NOTE: The function block Pulse2Counter must be used on M168 controllers that do not provide
fast counter inputs.
Why Use the Pulse2Counter Function Block?
The Pulse2Counter function block:
simplifies programming.
 reduces engineering and commissioning time.

Features of the Pulse2Counter Function Block
The Pulse2Counter provides the following features:
 accumulates the number of pulses of a digital input.
 is used to process meter information provided by pulses.
 provides an input to reset the counter value and indicates the date of the last reset.
Energy Meter
As part of the energy management, energy data from the energy meter can be read by an
M168 controller via pulse or Modbus communication.
212
Energy meter with pulse
communication
The M168 controller reads the energy data via a pulse
communication using the AFBs Pulse2Counter and
Counter2Energy (see page 218).
Energy meter with Modbus
communication
The M168 controller reads the energy data via a Modbus
communication using the AFB EnergyMeterModbusCom
(see page 228).
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Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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Pulse2Counter
Section 12.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of the Pulse2Counter function block:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables function block/ counting
xPulse
CJ_BIT
TRUE or FALSE
N/A
Input pulses from energy meter
xReset
CJ_BIT
TRUE or FALSE
N/A
Resets the accumulated pulse
value.
NOTE: The rising edge of the input
xReset resets the internal values
to zero.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
dwPulseCnt
CJ_DWORD
0…4294967295
N/A
Number of accumulated pulses
dtDateTimeReset
CJ_DATETIME
N/A
N/A
Date and time when the last reset
has been performed.
wAlarmID
CJ_WORD
0...65535
N/A
Alarm identification
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AlarmID Description
The AlarmID output represents a value from 0 to 65535, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The pulse duration is too short.
A reliable pulse count is not possible.
NOTE: This alarm is generated when the frequency of
the input is higher than 2 Hz or the time between
2 ON states of the pulse input is less than 500 ms.
1
Overflow alarm
The pulse count register has reached the maximum
limit value.
The pulse count is not continued.
dwPulseCnt value is retained.
2-15
N/A
N/A
Troubleshooting
The AlarmID output represents a value from 0 to 65535, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm
Problem
Solution
wAlarmID.0
The pulse duration is too short.
Check and increase the pulse width provided by an
energy meter.
wAlarmID.1
Overflow alarm
Reset the function block by a rising edge on the
xReset input.
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Pulse2Counter
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SoHVAC
Counter2Energy
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Chapter 13
Transform Counted Values to Energy: Counter2Energy
Transform Counted Values to Energy: Counter2Energy
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
13.1
Functional Overview
218
13.2
Pin Description
219
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217
Counter2Energy
Section 13.1
Functional Overview
Functional Overview
Counter2Energy Function Block Description
Function Block Description
The function block Counter2Energy transforms a numeric value to energy information. The
Counter2Energy function block may be used used with the Pulse2Counter function block
(see page 212) to provide energy information based on pulses received by a meter, or may be
used independently.
Why Use the Counter2Energy Function Block?
The function block Counter2Energy:
simplifies programming.
 reduces engineering and commissioning time.

Features of the Counter2Energy Function Block
The function block Counter2Energy provides the following features:
 converts pulses to energy information according to user-defined scaling definitions.
 calculates the active power based on the frequency the input value increases.
 provides active energy information of the counter value from the function block
Pulse2Counter (see page 212) or a fast counter input on the M168.
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
218
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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Counter2Energy
Section 13.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of the Counter2Energy function block:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block and
metering.
dwPulseCnt
CJ_DWORD
0…4294967295
1 pulse
Pulse count value from
Counter2Energy or fast
counter input.
wPulseConstant
CJ_WORD
1...1000
1 pulse / kWh
Number of pulses per kWh
provided by the meter.
wPulseConstant
The pulses are transformed to energy information according to:
dwTotalActiveEnergy = (dwPulseCnt / wPulseConstant)
If...
Then...
wPulseConstant is configured as 1 pulse
and the number of pulses counted is 100
the output dwTotalActiveEnergy is 100 kWh.
wPulseConstant is configured as 10 pulses the output dwTotalActiveEnergy is10 kWh.
and the number of pulses counted is 100
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Counter2Energy
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
lTotalActivePower
CJ_LONG
-2147483648
...2147483647
0.001 kW
Active power
0…4294967295
0.001 kWh
dwTotalActiveEnergy
CJ_DWORD
NOTE: The value is zero when
dwPulseCnt is zero.
Total active energy
NOTE: The
dwTotalActiveEnergy
value reaches the maximum
limit after 10.8 years, assuming
one pulse every 500 ms for
1 Wh consumption. In this
case, the parameter is set to 0,
and the function block
continues to operate.
wAlarmID
CJ_WORD
0...65535
N/A
Alarm identification
AlarmID Description
The AlarmID output represents a value from 0 to 65535, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
Invalid configuration of
wPulseConstant.
The value is less than 1 or greater
than 1000.
The function block stops calculating.
The dwTotalActiveEnergy value is retained.
1
Overflow alarm
The total active energy value has reached the
maximum limit. The energy accumulation restarts
from zero.
2-15
N/A
N/A
Alarm
Problem
Solution
wAlarmID.0
The value is less than 1 or greater
than 1000.
Check and configure the wPulseConstant value
between 1 to 1000.
wAlarmID.1
Overflow alarm
The energy accumulation restarts from zero
automatically.
Troubleshooting
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SoHVAC
EnergyTrend
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Chapter 14
Energy Meter Data Trend: EnergyTrend
Energy Meter Data Trend: EnergyTrend
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
14.1
Functional Overview
222
14.2
Pin Diagram
223
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221
EnergyTrend
Section 14.1
Functional Overview
Functional Overview
EnergyTrend Function Block Description
Function Block Description
The function block EnergyTrend is provided for applications that require energy monitoring where
the detailed energy consumption is needed for user-defined periods. It stores actual and historical
energy information on a daily, weekly, monthly, yearly, user-defined base.
It may be used with the function block Counter2Energy (see page 218) or with the function block
EnergyMeterModbusCom (see page 218), or it may be used independently.
Why Use the EnergyTrend Function Block?
The function block EnergyTrend:
 simplifies programming.
 reduces engineering and commissioning time.
Features of the EnergyTrend Function Block
The function block EnergyTrend provides the following features:
 stores the total energy consumption per day, week, month, and year.
 stores the total energy consumption for a user-defined period.
 stores all total energy consumption values of the previous measurement period.
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
222
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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EnergyTrend
Section 14.2
Pin Diagram
Pin Diagram
Pin Description
Pin Diagram
The following picture shows the pin diagram of the EnergyTrend function block:
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EnergyTrend
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
dwTotalActiveEnergy
CJ_DWORD
0…4294967295
0.001 kWh
Accumulated energy
xConsumReset
CJ_BIT
TRUE or FALSE
N/A
Trigger to store the current
value of dwConsumReset
into dwConsumPrevReset,
followed by setting
dwConsumReset to 0.
NOTE: The reset is
performed on a rising edge.
xReset
CJ_BIT
TRUE or FALSE
N/A
Used to reset the alarm.
NOTE: The alarm is reset at
the rising edge.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
dwConsumDayPrev
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed the previous day.
dwConsumDay
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed today.
dwConsumWeekPrev
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed the previous
week.
dwConsumWeek
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed this week.
dwConsumMonthPrev
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed the last month.
dwConsumMonth
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed this month.
dwConsumMonthly[12]
Array[0..11]
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed the last months
(January to December).
dwConsumYearPrev
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed the last year.
dwConsumYear
CJ_DWORD
0…4294967295
0.001 kWh
Total active energy
consumed this year.
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EnergyTrend
Output
Data Type
Range
Scaling / Unit
Description
dwConsumPrevReset
CJ_DWORD
0...4294967295
0.001 kWh
User-defined measurement
period. Total active energy
consumed between the last
2 xConsumReset.
dwConsumReset
CJ_DWORD
0...4294967295
0.001 kWh
User-defined measurement
period. Total active energy
consumed since the last
xConsumReset.
dtDateTimeReset
CJ_DATETIME
N/A
N/A
User-defined measurement
period. Date and time of the
last xConsumReset
performed.
wAlarmID
CJ_WORD
0...65535
N/A
Alarms
NOTE: dwConsumMonthly[0] – January consumption,....dwConsumMonthly[11] –
December consumption.
NOTE:



Calculations are based on the M168 internal clock. Make sure that the clock is configured
properly.
Week data reflect consumption from Sunday 00:00 AM to Saturday 11:59 PM.
Month data reflect consumption from first day 00:00 AM to last day 11:59 PM.
AlarmID Description
The AlarmID output represents a value from 0 to 65535, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The value of
dwTotalActiveEnergy is
decreasing.
The function block stops calculating.
All total active energy values are retained.
1-15
N/A
N/A
NOTE: Reset the alarm bit 0 with the input pin xReset. After resetting the alarm the outputs are
updated with new calculated values.
Troubleshooting
Alarm
Problem
Solution
wAlarmID.0
The value of
dwTotalActiveEnergy is
decreasing.
Check the source connected to the input
dwTotalActiveEnergy to provide decreasing
energy values.
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EnergyTrend
226
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SoHVAC
EnergyMeterModbusCom
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Chapter 15
Energy Meter Modbus Communication Module: EnergyMeterModbusCom
Energy Meter Modbus Communication Module:
EnergyMeterModbusCom
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
15.1
Functional Overview
228
15.2
Pin Description
230
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227
EnergyMeterModbusCom
Section 15.1
Functional Overview
Functional Overview
EnergyMeterModbusCom Function Block Description
Function Block Description
The EnergyMeterModbusCom function block manages the Modbus communication between the
M168 controller and a power meter device of the iEM3••• series.
The M168 controller acts as a Modbus master device.
The function block EnergyMeterModbusCom supports the energy meters (see page 212)
iEM3150, iEM3155, iEM3250, iEM3255 and PM3250.
Hardware Structure
The following picture shows the M168 controller communication interfaces.
Why Use the EnergyMeterModbusCom Function Block?
The function block EnergyMeterModbusCom:
 simplifies programming.
 reduces engineering and commissioning time.
228
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EnergyMeterModbusCom
Features of the EnergyMeterModbusCom Function Block
The function block EnergyMeterModbusCom provides the following features:
manages the communication between the M168 and an iEM3••• energy meter.
 reads the energy information according to the user-defined time interval.
 provides the following energy information:
 Total active energy
 Active power and power factor
 Average current
 Average phase and line voltage
 Frequency

Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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EnergyMeterModbusCom
Section 15.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of the EnergyMeterModbusCom function block:
Input Pin Description
Input
Data Type
Range
Scaling / Unit Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
byDeviceNr
CJ_BYTE
1...247
N/A
Modbus SL address assigned to the energy
meter.
NOTE: The Modbus SL address assigned
to the meter must be unique in the network.
wReadTimer
CJ_WORD
0...65535
1 sec
Interval to read energy information from the
meter.
Default value: 10 sec
wTimeOut
CJ_WORD
0...65535
1 sec
Interval by that the communication status to
the meter is checked.
Default value: 10 sec
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EnergyMeterModbusCom
wTimeOut
The time defined with wTimeout represents the minimum interval the communication status of the
meter is verified. This function becomes active if the wReadTimer value is greater that the
wTimeout.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
byState
CJ_BYTE
0…2
N/A
Function block status:
0 - idle
1 - reading
2 - alarm
shPowerFactor
CJ_SHORT
-32768…32767
0.01
Total power factor
wAvgCurrent
CJ_WORD
0…65535
0.1 A
Average current
wAvgPhaseVoltage
CJ_WORD
0…65535
0.1 V
Average phase voltage
wAvgLineVoltage
CJ_WORD
0…65535
0.1 V
Average line voltage
wFreq
CJ_WORD
0…65535
0.1 Hz
Frequency
ITotalActivePower
CJ_LONG
2147483648…21
47483647
0.001 kW
Total active power
dwTotalActiveEnergy
CJ_DWORD
0…4294967295
1 Wh
Total active energy
wAlertID
CJ_WORD
0…65535
N/A
Detected alerts
wAlarmID
CJ_WORD
0...65535
N/A
Detected alarms
AlarmID Description
The AlarmID output represents a value from 0 to 65535, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
Invalid Modbus SL address on
input byDeviceNr
No communication is executed.
1
Communication timeout
The Modbus SL device is not responding. No
actual energy information is provided by the
function block.
2-15
N/A
N/A
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EnergyMeterModbusCom
AlertID Description
The AertID output represents a value from 0 to 65535, whereby each bit represents a detected
alert. The table contains the bits and their description:
Alert Bit
Alert Cause
0
The Modbus SL address has been The function block is still operating with the
changed on input byDeviceNr but previous (initial) address assigned.
To make the new settings effective, disable the
has not become effective yet.
function block and re-enable it again.
Effect
1-15
N/A
N/A
Troubleshooting
Alarm
Problem
Solution
wAlarmID.0
Invalid Modbus SL address on
input byDeviceNr.
Verify that the address assigned is between
1...247. Disable and re-enable the function block.
wAlarmID.1
Communication timeout
1. Check that the Modbus SL address assigned to
byDeviceNr is equal to the address assigned
to the meter.
2. Verify the proper network wiring.
3. Check that the communication settings (speed
/ parity / number of stopbits) of the energy meter
and the M168 are equal.
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SoHVAC
Float2Long
EIO0000000663 05/2014
Chapter 16
Float to Long Converter: Float2Long
Float to Long Converter: Float2Long
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
16.1
Functional Overview
234
16.2
Pin Description
235
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233
Float2Long
Section 16.1
Functional Overview
Functional Overview
Float2Long Function Block Description
Function Block Description
The Float2Long function block is used to convert a FLOAT variable coded in 2 words (Low Word
and High Word) into a CJ_LONG variable.
The precision of the converted variable and the word order of the Double Word can be configured.
Why Use the Float2Long Function Block?
The Float2Long function block simplifies programming.
IEEE 754 Single Precision Binary Floating-Point Format: Binary 32
According to the IEEE 754 standard, a binary 32 includes:
Sign bit: 1 bit
 Exponent: 8 bits
 Fraction: 23 bits + the first bit

This means, that a binary 32 number has a total precision of 24 bits.
224 = 16777216
NOTE: If the floating number is higher than 16777216 or lower than -16777216, the converted
value is rounded and the calculation is not accurate.
The data length is limited to 16 bits that is why the floating variables are transmitted in 2 frames:
32
16
HIGH WORD
15
0
LOW WORD
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
234
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
EIO0000000663 05/2014
Float2Long
Section 16.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of Float2Long:
Input Pin Description
Input
Data Type
Range
Scaling / Unit
xEn
CJ_BIT
TRUE or FALSE
N/A
Description
Enable/Disable the function block
NOTE: If the function block is disabled,
the outputs lLong and wAlarmID are
set to 0 and the function block is not
executed.
wFloat[0]
CJ_WORD
0... 65535
N/A
Low/high word of the FLOAT variable
wFloat[1]
CJ_WORD
0 ...65535
N/A
Low/high word of the FLOAT variable
byPrecision
CJ_BYTE
0... 6
N/A
Precision of the converted variable
xSwap
CJ_BIT
TRUE or FALSE
N/A
Used to change the word order of the
double WORD
TRUE: low word first
FALSE: high word first
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Float2Long
wFloat[0], wFloat[1]
Example: The real value 123.456 equals to 1714259769 (conversion of a real value into a FLOAT).
The input wFloat:
wFloat[0] = 59769
 wFloat[1] = 17142

If...
Then...
xSwap = FALSE (low word first),
 the low word is equal to 59769
 the high word is equal to 17142
The 2 WORDs are combined to get a DWORD: 1714259769. This value is stored as a DWORD in
the union without conversion.
The value 1714259769 is converted as a LONG. If the byPrecision is equal to 3, lLong is equal
to 123456.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
ILONG
CJ_LONG
-2147483648…2147483647
–/byPrecision
Decimal value converted
with the precision set as
per the byPrecision
input.
NOTE: The output
lLong needs to be
connected to a variable
with the same precision
(byPrecision).
wAlarmID
CJ_WORD
0…65535
N/A
Alarm identification
NOTE: If the function block is disabled, the outputs lLong and wAlarmID are set to 0 and the
function block is not executed.
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Float2Long
AlarmID Description
The AlarmID output represents a value from 0 to 31, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The input byPrecision is not within the
defined range.
The conversion cannot be executed.
lLong is set to 0.
1
Underflow alarm
The converted value is limited to the
minimum value -2147483648.
2
Overflow alarm
The converted value is limited to the
maximum value 2147483647.
3
Overflow alarm: the converted value multiplied The converted value is limited to the
by the precision is not within the defined range. maximum value 2147483647.
4
Underflow alarm: the converted value
multiplied by the precision is not within the
defined range.
The converted value is limited to the
minimum value -2147483648.
5-15
Not used
N/A
Alarm
Problem
Solution
wAlarmID.0
The input byPrecision is not within the
defined range.
Check the parameter ranges
Set the value within the defined range.
wAlarmID.1
Underflow alarm
Check the value of the input wFloat.
wAlarmID.2
Overflow alarm
Check the value of the input wFloat.
wAlarmID.3
Overflow alarm: the converted value multiplied Check the value of the precision
by the precision is not within the defined range. byPrecision.
wAlarmID.4
Underflow alarm: the converted value
multiplied by the precision is not within the
defined range.
Troubleshooting
Check the value of the precision
byPrecision.
NOTE: The Alarm ID wAlarmID is reset automatically when the alarms disappear.
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Float2Long
238
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SoHVAC
PIDAdvanced
EIO0000000663 05/2014
Chapter 17
PID Control Function Block: PIDAdvanced
PID Control Function Block: PIDAdvanced
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
17.1
Functional Overview
240
17.2
Pin Description
243
EIO0000000663 05/2014
239
PIDAdvanced
Section 17.1
Functional Overview
Functional Overview
PIDAdvanced Function Block Description
Function Block Description
The PIDAdvanced function block is designed for monitoring and controlling a wide variety of
dependant processes. It includes the functions of dead band, manual mode, and hold.
The PIDAdvanced function block can be used on various applications requiring regulation such
as temperature control, pressure control, and flow control.
This function block incorporates a PID algorithm.
NOTE: The PIDAdvanced function block is designed to be operated on the TM168 (S- type)
controller.
NOTE: The PIDAdvanced function block can be extended with the autotuning function
(see page 300).
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PIDAdvanced
Functional Overview of the PIDAdvanced
The graphic shows a functional overview of the PIDAdvanced
Transfer Function
The PIDAdvanced function block works according to the following transfer function:
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241
PIDAdvanced
Why Use the PIDAdvanced Function Block?
The PIDAdvanced function block provides the following purposes:
The PIDAdvanced function block can be used in heating or cooling mode (direct / reverse
control).
 The embedded integral anti-windup function helps to prevent the PID controller from large
integral corrective actions

Features of the PIDAdvanced Function Block
The PIDAdvanced function block provides the following features:
 Operating modes: automatic and manual
 Hold function: freezes the output value of the PID
 Integral anti-windup
 Dead band for more stable control
 Adjustable high or low limits
 Direct and reverse control
Operating Modes
The PIDAdvanced function block provides 2 operating modes:
Automatic mode
 Closed loop
 In automatic mode, the control output is generated by
Manual mode
 Open loop
 In manual mode, you enter the value of the control output.
PIDAdvanced
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
242
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
EIO0000000663 05/2014
PIDAdvanced
Section 17.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of PIDAdvanced:
EIO0000000663 05/2014
243
PIDAdvanced
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enable/Disable the function
block.
TRUE: Enable
shPv
CJ_SHORT
-32768…32767
0.1/user unit
Actual value from the
process.
The process value needs to
be scaled outside of the
function block.
NOTE: Make sure that the
set-point and the process
value have the same unit.
shSetp
CJ_SHORT
-32768…32767
0.1/user unit
Value of set-point
xManualMode
CJ_BIT
TRUE or FALSE
N/A
TRUE: Enables manual
mode
FALSE: Disables manual
mode
Default value: FALSE
wManualValue
REAL
wMinLim...wHighLim
–0.01 %
Manual value for the analog
output wAnalog
xHold
CJ_BIT
TRUE or FALSE
N/A
This pin is used to freeze the
analog output
(xHold=TRUE). The internal
calculation of the integral
term freezes also.
 TRUE: Holds the PID
action
 FALSE: Resumes the
PID action
Default value: FALSE
NOTE: If set to FALSE the
calculation starts at the last
frozen value off the analog
output (wAnalog).
wHighLimit
CJ_WORD
wLowLim to 10000
0.01 %
wLowLimit
CJ_WORD
0 to wHighLim
0.01 %
Low limit of PID output.
wDeadband
CJ_WORD
0 to wHighLim
0.1/user unit
Smoothes the control
behavior.
xAutoTune
CJ_BIT
TRUE or FALSE
N/A
FALSE: Not active
TRUE: External autotuning
function is active.
Default value: FALSE
244
High limit of PID output.
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PIDAdvanced
Input
Data Type
Range
Scaling / Unit
Description
wAutoTuneValue
CJ_WORD
0..10000
0.01 %
Value for wAnalogOut
determined by the external
autotuning function.
Default value: 0.00
shKp
CJ_SHORT
-30000...+30000
0.01 / user unit
Value of proportional gain
configured by you.
wTi
CJ_WORD
0..60000
sec
Value of the integral time
configured by you or
autotuning.
Default value: 0
wTd
CJ_WORD
0..60000
sec
Value of derivative damping
time configured by you.
Default value: 0
xReset
CJ_BIT
TRUE or FALSE
N/A
FALSE: not active
TRUE: Alarms are reset by a
rising edge.
NOTE: This pin is used to
reset only the alarms. To
reset the alarms, change the
parameter which caused the
alarm and give a rising edge
on pin xReset.
NOTE: Alerts are reset
automatically.
xManualMode, wManualValue
If...
Then...
xManualMode is set to TRUE
the manual mode is active and the output
wAnalog takes the value of wManualValue.
xManualMode is set to FALSE
the calculation starts at the last entered manual
value wManualValue.
wLowLimit, wHighLimit
The values at these pins define the range of PIDAdvanced output (wAnalog). These values are
configured as per the analog output module specification.
Example:
wHighLimit = 100.00 (%)
wLowLimit = 0.00 (%)
The PIDAdvanced controls the analog output between 0.00 and 100.00 %.
wHighLimit = 50.00 (%)
wLowLimit = 10.00 (%)
The PIDAdvanced controls the analog output between 10.00 and 50.00 %.
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PIDAdvanced
wDeadband
The value at this pin defines the limit of the dead band for a detected error. This dead band function
is used to make the PIDAdvanced output to settle down.
Example:
shSetp = 45.0 ° C (113 ° F)
shPv = 0…60.0 ° C (32...140 ° F) (range of sensor)
wHighLimit = 100.00 (%)
wLowLimit = 0.00 (%)
wDeadband = 2.5 ° C (36.5 ° F) (+/-)
The graphic shows the dead band function:
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Proportional Gain shKp
Example:
shKp > 0
For example control for heating.
shKp = 0
The output wAnalog is set to 0.
shKp < 0
For example, control for cooling (inverse control).
Integral Time wTi
Example:
wTi = 1
Fast integration time, causes a fast influence on the output wAnalog.
wTi = 10
10 times slower than the fast integration time (a) and causes a slower
influence on the output wAnalog.
wTi = 0
wTi is deactivated.
Derivate Time wTd
Example:
wTd = 1
The smallest damping, causes a high influence to the output wAnalog.
wTd = 10
1/10 of the smallest damping, causes a lower influence on the output
wAnalog.
wTd = 0
wTd is deactivated.
NOTE: In systems with dead time, wTd should be set to 0.The value of Td should not be less than
the cycle time. If it is less than the cycle time, then the Td value is overwritten with the value of the
cycle time.
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PIDAdvanced
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
wAnalog
shError
CJ_WORD
wLowLim to wHighLim
0.01 / %
Analog output
CJ_SHORT
shSp to shPv
0.01 / user unit
Actual detected error
between shSp and shPv.
Default value: 0.00
wAlarmID
CJ_WORD
0...65535
N/A
Alarm identification
wAlertID
CJ_WORD
0...65535
N/A
Alert identification
AlarmID Description
The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
wAnalog is set to 0.
0
Invalid cycle time
1
Invalid input limit parameters
(wHighLim, wLowLim)
2
Invalid range wDeadBand
3
Invalid PID parameter (shKp, wTi, wTd)
4-15
not used
N/A
AlertID Description
The table contains the bits and their description:
Alert Bit
Alert Cause
Effect
0
Invalid range wManualValue
wAnalog is set to wHighLimit or
wLowLimit
1
wLowlimit is equal to wHighLimit
N/A
2
Autotuning is active.
N/A
3
shKp is 0 (zero).
wAnalog is 0 (zero).
4-15
not used
N/A
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Troubleshooting
Alarm/Alert
Problem
Solution
wAlarmID.0
Application cycle time is too long.
Cycle time > 2000 msec
The application is too large.
Reduce the application and check the cycle
time.
wAlarmID.1
wLowLim > wHighLim
wHighLim> 00.00
wLowLim > 100.00
Enter valid values.
wAlarmID.2
wDeadBand < 0.0
wDeadBand < wHighLim
Enter valid values.
wAlarmID.3
shKp < -300.00
shKp > +300.00
wTi < 0
wTi > 60000
wTd < 0
wTd > 60000
Enter valid values.
wAlertID.0
wManVal > wHighLim
wManVal > wHighLim
Enter valid values.
wAlertID.1
N/A
N/A
wAlertID.2
N/A
Wait until autotuning is finished.
wAlertID.3
N/A
Enter valid values.
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CompCntrl_Slider
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Chapter 18
Compressor Control for Screw Compressor with Slider Capacity: CompCntrl_Slider
Compressor Control for Screw Compressor with Slider
Capacity: CompCntrl_Slider
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
18.1
Functional Overview
252
18.2
Pin Description
253
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CompCntrl_Slider
Section 18.1
Functional Overview
Functional Overview
CompCntrl_Slider Function Block Description
Function Block Description
The CompCntrl_Slider function block controls the operation and the cooling power of one
screw compressor with modulating capacity control.
NOTE: This function block must be used together with the function block CompAlarmMgmt
(see page 282) to help prevent potential damages of the compressor.
Why Use the CompCntrl_Slider Function Block?
The CompCntrl_Slider function block provides the following purposes:
The compressor can be operated in automatic, manual or in maintenance mode.
 The integrated timers help to prevent the compressor from frequent switching.

Features of the CompCntrl_Slider Function Block








3 different operating modes (see page 257): automatic, manual, maintenance
Quick stop of the compressor
Support part winding
Internal temperature controller
Timers (see page 257): wMinOnTime, wMinOffTime, wMinCycleTime
Display compressor operating hours
Display compressor number of starts
Display remaining time;
 minimum on timer
 minimum off timer
 cycle timer
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
252
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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CompCntrl_Slider
Section 18.2
Pin Description
Pin Description
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CompCntrl_Slider
Pin Description
Pin Diagram
The following picture shows the pin diagram of CompCntrl_Slider:
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CompCntrl_Slider
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function
block.
byMode
CJ_BYTE
1…3
N/A
Mode control of the
compressor:
 1: automatic
 2: manual
 1: maintenance
shProcessValue
CJ_SHORT
-32768 … 32767
0.1 ° C (32.18 ° F) Process value
xCommand
CJ_BIT
TRUE or FALSE
N/A
shSetp
CJ_SHORT
-32768 … 32767
0.1 ° C (32.18 ° F) Set-point in automatic
mode
xManualCommand
CJ_BIT
TRUE or FALSE
N/A
shManualSetp
CJ_SHORT
-32768 … 32767
0.1 ° C (32.18 ° F) Set-point in manual
mode or in maintenance
mode (optional)
xQuickStop
CJ_BIT
TRUE or FALSE
N/A
Starts/stops the
compressor in automatic
mode.
Starts/stops the
compressor in manual or
in maintenance mode
(optional).
Quick stop of the
compressor
NOTE: If the input
xQuickStop is set to
TRUE, the compressor is
immediately stopped
even if the timer
wMinOnTime has not
elapsed and the stopping
mode (to move the piston
to the initial position) is
not active.
wCompMgmtAlarmID
CJ_WORD
0…65535
N/A
wDeadband
CJ_WORD
0…65535
0.1 ° C (32.18 ° F) Dead band around the
set-point, where both
CR3 and CR4 valves are
closed.
Default value: 2.0 ° C
(35.6 ° F)
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AlarmID input from the
function block
CompAlarmMgmt.
255
CompCntrl_Slider
Input
Data Type
Range
Scaling / Unit
Description
wMinOnTime
CJ_WORD
0…65535
sec
Minimum time the
compressor is running.
wMinOffTime
CJ_WORD
0…65535
sec
Minimum time the
compressor is stopped.
wMinCycleTime
CJ_WORD
0…65535
sec
Minimum time between 2
consecutive starts of the
compressor.
wDelayPartWinding
CJ_WORD
100… 65535
ms
Delay for part winding for
the start of the
compressor.
Default value: 500 ms
wPulseTimeCR3
CJ_WORD
100… 65535
ms
Pulse time of the valve
CR3.
Default value: 500 ms
wPauseTimeCR3
CJ_WORD
100… 65535
ms
Pause time of the valve
CR3 (between 2 pulses).
Default value: 500 ms
wPulseTimeCR4
CJ_WORD
100… 65535
ms
Pulse time of the valve
CR4.
Default value: 500 ms
wPauseTimeCR4
CJ_WORD
100… 65535
ms
Pause time of the valve
CR4 (between 2 pulses).
Default value: 500 ms
wValve100Time
CJ_WORD
100… 65535
ms
Time to move the piston
from the maximum
position to the initial
position.
Default value: 500 ms
xOpHoursReset
CJ_BIT
TRUE or FALSE
N/A
Reset the operating
hours dwOpHours and
the number of starts
dwNbStarts.
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CompCntrl_Slider
Operating Mode byMode
The CompCntrl_Slider function block provides 3 operating modes:
Automatic mode, byMode = 1
 The compressor is controlled with the inputs wSetp and xCommand.
 The timers and the alarms are enabled.
Manual mode, byMode = 2
 The compressor is controlled with the inputs wManualSetp and
xManualCommand.
 The timers and the alarms are enabled.
Maintenance mode, byMode = 3  The compressor is controlled with the inputs wManualSetp and
xManualCommand.
 The timers are disabled.
 The alarms are enabled.
Timers wMinOnTime, wMinOffTime, wMinCycleTime
The timers help prevent that the compressor is stopped and started too often. You can set these
durations:
 wMinOnTime
 wMinOffTime
 wMinCycleTime
NOTE: When the compressor is started (xCommand or xManualCommand is set to TRUE) or
stopped (xCommand or xManualCommand is set to FALSE), the compressor cannot be stopped or
started until the timer wMinOnTime or wMinOffTime has elapsed or if the time duration during 2
starts of the compressor is lower than wMinCycleTime.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
byState
CJ_BYTE
0… 99
N/A
Current state:
1: idle
10: PartWinding1
11: PartWinding2
20: Run
30: Stop
99: Alarm
xPartWinding1
CJ_BIT
TRUE or FALSE
N/A
Command of part
winding 1
xPartWinding2
CJ_BIT
TRUE or FALSE
N/A
Command of part
winding 2
xCommandCR3
CJ_BIT
TRUE or FALSE
N/A
Command of valve CR3
NOTE: Use a solid-state
relay to control the
valve CR3.
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CompCntrl_Slider
Output
Data Type
Range
Scaling / Unit
Description
xCommandCR4
CJ_BIT
TRUE or FALSE
N/A
Command of valve CR4
NOTE: Use a solid-state
relay to control the
valve CR4.
CJ_DWORD
0… 4294967296
dwNbStarts
CJ_DWORD
0… 4294967296
N/A
Total number of starts
dwCompMgmtStatus
CJ_DWORD
0… 4294967296
N/A
Status of the FB
wElapsedOnTime
CJ_WORD
0… 65535
sec
Remaining time before
the minimum On time
elapsed.
wElapsedOffTime
CJ_WORD
0… 65535
sec
Remaining time before
the minimum Off time
elapsed.
wElapsedCycleTime
CJ_WORD
0… 65535
sec
Remaining time before
the minimum cycle time
elapsed.
wAlarmID
CJ_WORD
0… 65535
N/A
Alarm identification
dwOpHours
hours
Total number of
operating hours
NOTE: Every time the compressor is started, the value dwNbStarts is incremented and the timer
dwOpHours is started without reset.
NOTE: When the input xOpHoursReset is set to TRUE, the number of starts and the operating
hours are reset: the values dwNbStarts and dwOpHours are set to 0 and remain at 0, as long as
the input xOpHours is set to TRUE.
Enable
If the function block is disabled, the compressor is switched off and the function block is not
executed.
NOTE: After the function block is enabled, the compressor can be started even if the duration of
the stop is lower than wMinOffTime or if the duration between 2 consecutive starts is lower than
wMinCycleTime.
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CompCntrl_Slider
Normal Operation
To avoid that the compressor is stopped and started too often, you can set the duration
wMinOnTime, wMinOffTime and wMinCycleTime with the appropriate values.
If...
Then...
the compressor is started
xCommand or xManualCommand is set to TRUE
the compressor is stopped
xCommand or xManualCommand is set to FALSE
NOTE: The compressor cannot be stopped or started until the timer wMinOnTime or
wMinOffTime has elapsed or when the time duration during 2 starts of the compressor is lower
than wMinCycleTime.
Operating Hours and Number of Starts
dwNbStarts accumulates the number of starts and the timer dwOpHours accumulates the
operating hours when the compressor is started. These values should be retained even when the
controller is power cycled.
If the input xResetOpHours is set to TRUE, the number of starts and the operating hours are
reset: the values dwNbStarts and dwOpHours are set to 0 and remain set to 0 as long as the
input xOpHours is set to TRUE.
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CompCntrl_Slider
Control of the Cooling Capacity
The following figure shows how the regulation of the cooling power is done internally by adjusting
the cooling capacity of the compressor. CAP indicates if the cooling capacity must be increased or
reduced.
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CompCntrl_Slider
dwCompMgmtStatus
Bit 0-23 operating hours ( max. 16.777.216 hours)
Bit 24: reserved
Bit 25: reserved
Bit 26-27: compressor mode 1 = auto, 2 = manual, 3 = maintenance
Bit 28: ON-timer active
Bit 29: OFF-timer active
Bit 30: Cycle timer active
Bit 31: Alarm
The following table details the compressor mode desciption for bit 25 and bit 26:
Bit 26
Bit 25
Compressor mode description
0
0
Compressor FB disabled
0
1
Auto
1
0
Manual
1
1
Maintenance
Alarm ID Description
The AlarmID output represents a value from 0 to 3, whereby each bit represents a detected alarm.
The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The value of the input byMode is invalid.
The compressor is stopped.
1
wCompMgmtAlarmID input is not equal to 0. The compressor is stopped.
2-15
not used
N/A
Troubleshooting
In case of an alarm the compressor is stopped and the function block goes into alarm state. If
compressor goes into normal state, it is automatically restarted after the timers wMinCycleTime
and wMinOffTime have elapsed:
Alarm
Problem
Solution
wAlarmID.0 TRUE
The value of the input byMode is invalid.
Check the parameter ranges.
Set the value within the defined range.
wAlarmID.1 TRUE
wCompMgmtAlarmID input is not equal to 0. Check the alarms of the function block
CompAlarmMgmt.
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CompCntrl_Slider
262
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SoHVAC
CompCntrl_OnOff
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Chapter 19
Compressor Control for Generic On/Off Compressors: CompCntrl_OnOff
Compressor Control for Generic On/Off Compressors:
CompCntrl_OnOff
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
19.1
Functional Overview
264
19.2
Pin Description
265
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263
CompCntrl_OnOff
Section 19.1
Functional Overview
Functional Overview
CompCntrl_OnOff Function Block Description
Function Block Description
The CompCntrl_OnOff function block controls 1 on-off scroll compressor.
This function block can be used with fix speed scroll, piston (1 stage reciprocal compressor) and
screw compressors.
NOTE: This function block must be used together with the function block CompAlarmMgmt to help
prevent damages of the compressor.
Why Use the CompCntrl_OnOff Function Block?
The CompCntrl_OnOff provides the following purposes:
 The compressor can be operated in automatic, manual or in maintenance mode.
 The integrated timers help to prevent the compressor from frequent switching.
Features of the CompCntrl_OnOff Function Block






3 different operating modes (see page 257): automatic, manual, maintenance
Quick stop of the compressor
Timers (see page 257): wMinOnTime, wMinOffTime, wMinCycleTime
Display compressor operating hours
Display compressor number of starts
Display remaining time:
 minimum on timer
 minimum off timer
 cycle timer
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
264
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
EIO0000000663 05/2014
CompCntrl_OnOff
Section 19.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of CompCntrl_OnOff:
EIO0000000663 05/2014
265
CompCntrl_OnOff
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
For more information refer to
Enable (see page 258).
byMode
CJ_BYTE
1…3
N/A
Mode control of the
compressor:
 1: automatic
 2: manual
 3: maintenance
For more information refer to
Operating Mode
(see page 257).
xCommand
CJ_BIT
TRUE or FALSE
N/A
Command of the compressor in
automatic mode
xManualCommand
CJ_BIT
TRUE or FALSE
N/A
Command of the compressor in
manual or in maintenance
mode (optional).
xQuickStop
CJ_BIT
TRUE or FALSE
N/A
Quick stop of the compressor
NOTE: If the input
xQuickStop is set to TRUE,
the compressor is immediately
stopped even if the timer
wMinOnTime has not elapsed.
wCompMgmtAlarmID
CJ_WORD
0…65535
N/A
AlarmID input from the
function block
CompAlarmMgmt.
wMinOnTime
CJ_WORD
0…65535
sec
Minimum time the compressor
is running.
wMinOffTime
CJ_WORD
0…65535
sec
Minimum time the compressor
is stopped.
wMinCycleTime
CJ_WORD
0…65535
sec
Minimum time between 2
consecutive starts of the
compressor.
xOpHoursReset
CJ_BIT
TRUE or FALSE
N/A
Reset the operating hours
dwOpHours and the number of
starts dwNbStarts.
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CompCntrl_OnOff
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
byState
CJ_BYTE
0… 255
N/A
Current state:
1: idle
20: Run
99: Alarm
xCompCommand
CJ_BIT
TRUE or FALSE
N/A
Compressor command
dwOpHours
CJ_DWORD
0… 4294967296
hours
Total number of operating hours
dwNbStarts
CJ_DWORD
0… 4294967296
N/A
Total number of starts
dwCompMgmtStatus
CJ_DWORD
0… 4294967296
N/A
Status of the function block
wElapsedOnTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum On time elapsed.
wElapsedOffTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum Off time elapsed.
wElapsedCycleTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum cycle time elapsed.
wAlarmID
CJ_WORD
0… 65535
N/A
Alarm ID
dwCompMgmtStatus
Bit 0-23 operating hours ( max. 16.777.216 hours)
Bit 24: reserved
Bit 25: reserved
Bit 26-27: compressor mode 1 = auto, 2 = manual, 3 = maintenance
Bit 28: ON-timer active
Bit 29: OFF-timer active
Bit 30: Cycle timer active
Bit 31: Alarm
The following table details the compressor mode desciption for bit 25 and bit 26:
Bit 26
Bit 25
Compressor mode description
0
0
Compressor FB disabled
0
1
Auto
1
0
Manual
1
1
Maintenance
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CompCntrl_OnOff
Alarm ID Description
The AlarmID output represents a value between 0 and 3, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The value of the input byMode is invalid.
The compressor is stopped.
1
wCompMgmtAlarmID input is not equal to 0.
The compressor is stopped.
2-15
not used
N/A
Troubleshooting
In case of an alarm the compressor is stopped and the function block goes into alarm state. If the
compressor goes into normal state, it is automatically restarted after the timers wMinCycleTime
and wMinOffTime have elapsed:
Alarm
Problem
Solution
wAlarmID.0 TRUE
The value of the input byMode is invalid.
Check the parameter ranges.
Set the value within the defined
range.
wAlarmID.1 TRUE
wCompMgmtAlarmID input is not equal to 0.
Check the alarms of the function
block CompAlarmMgmt.
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SoHVAC
CompCntrl_VS
EIO0000000663 05/2014
Chapter 20
Compressor Control for Variable Speed Compressors: CompCntrl_VS
Compressor Control for Variable Speed Compressors:
CompCntrl_VS
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
20.1
Functional Overview
270
20.2
Pin Description
272
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CompCntrl_VS
Section 20.1
Functional Overview
Functional Overview
CompCntrl_VS Function Block Description
Function Block Description
The CompCntrl_VS function block controls 1 scroll, screw or reciprocating compressor through
variable speed drive in order to control compressor capacity.
NOTE: This function block must be used together with the function block CompAlarmMgmt to help
prevent damages of the compressor.
Why Use the CompCntrl_VS Function Block?
The CompCntrl_VS provides the following purposes:
The compressor can be operated in automatic, manual or in maintenance mode.
 The integrated timers help to prevent the compressor from frequent switching.
 The CompCntrl_VS function block provides an oil recovery function which increases
temporarily the variable speed drive frequency to circulate oil through the compressor.
 The CompCntrl_VS function block suppresses resonance frequencies to reduce noise and
increase compressor life time.

Features of the CompCntrl_VS Function Block









270
3 different operating modes (see page 257): automatic, manual, maintenance
Quick stop of the compressor
Start/stop procedure
Oil recovery (see page 276)
Timers (see page 257): wMinOnTime, wMinOffTime, wMinCycleTime
Eliminate resonance frequency range
Display compressor operating hours
Display compressor number of starts
Display remaining time:
 minimum on timer
 minimum off timer
 cycle timer
EIO0000000663 05/2014
CompCntrl_VS
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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CompCntrl_VS
Section 20.2
Pin Description
Pin Description
272
EIO0000000663 05/2014
CompCntrl_VS
Pin Description
Pin Diagram
The following picture shows the pin diagram of CompCntrl_VS:
EIO0000000663 05/2014
273
CompCntrl_VS
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
(see page 258)
byMode
CJ_BYTE
1…3
N/A
Mode control of the compressor:
 1: automatic
 2: manual
 1: maintenance
For more information, refer to
Operating Mode (see page 257).
CJ_BIT
TRUE or FALSE
N/A
Command to start or stop the
compressor regulation.
wSetp
CJ_WORD
0… 1000
0.1 %
Set-point in automatic mode
wManualSetp
CJ_BIT
0… 1000
0.1 %
Set-point in manual or
maintenance mode (optional)
xQuickStop
CJ_BIT
TRUE or FALSE
N/A
Quick stop of the compressor
xStart
NOTE: If the input xQuickStop
is set to TRUE, the compressor is
immediately stopped even if the
timer wMinOnTime has not
elapsed.
wCompMgmtAlarmID
CJ_WORD
0…65535
N/A
AlarmID input from the function
block CompAlarmMgmt.
wMinSetp
CJ_WORD
0…1000
0.1 %
Minimum set-point that
corresponds to the
wMinFequency.
NOTE: wMinSetp must be lower
than 100.0%.
wStartingTime
CJ_WORD
0…65535
sec
Duration of the starting mode
wStoppingTime
CJ_WORD
0…65535
sec
Duration of the stopping mode
wOilRecoveryTime
CJ_WORD
0…65535
sec
Maximum time oil recovery mode
will be started.
wOilRecoveryPeriod
CJ_WORD
0…65535
sec
Duration of the oil recovery mode
wMinOnTime
CJ_WORD
0…65535
sec
Minimum time the compressor is
running.
wMinOffTime
CJ_WORD
0…65535
sec
Minimum time the compressor is
stopped.
wMinCycleTime
CJ_WORD
0…65535
sec
Minimum time between 2
consecutive starts of the
compressor.
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Input
Data Type
Range
Scaling / Unit
Description
wMinFreq
CJ_WORD
0…2000
0.1 Hz
Minimum frequency of the
compressor that corresponds to
the minimum set-point.
NOTE: wMinFreq must be lower
than wMaxFreq.
wMaxFreq
CJ_WORD
0…2000
0.1 Hz
Maximum frequency of the
compressor
wFreqLimits[10]
CJ_WORD
0…2000
0.1 Hz
Frequency bands disabled to
avoid resonance.
xOpHoursReset
CJ_BIT
TRUE or FALSE
N/A
Reset the operating hours
dwOpHours and the number of
starts dwNbStarts.
Frequency Limitations
The frequency of the variable speed drive is limited by the minimum frequency wMinFreq and by
the maximum frequency wMaxFreq.
NOTE: wMinFreq must be lower than wMaxFreq.
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CompCntrl_VS
Oil Recovery
If...
Then...
the compressor is started,
xCompCommand is set to TRUE and wFreq is set to
wMaxFreq during the duration of wStartingTime.
the compressor has run for the set time
wOilRecoveryTime,
wFreq is set to wMaxFreq during the duration
wOilRecoveryPeriod.
the compressor has the order to stop,
wFreq is set to wMaxFreq during the duration
wStoppingTime.
wStoppingTime has elapsed,
xCompCommand and wFreq are set to 0.
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Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
byState
CJ_BYTE
0… 255
N/A
Current state:
1: Idle
10: Starting
20: Run
30: Oil recovery
40: Stopping
99: Alarm
xCompCommand
CJ_BIT
TRUE or FALSE
N/A
Compressor command
wFreq
CJ_WORD
0… 1000
0.1 Hz
Frequency set-point for the
variable speed drive.
dwOpHours
CJ_DWORD
0… 4294967296
hours
Total number of operating hours
dwNbStarts
CJ_DWORD
0… 4294967296
N/A
Total number of starts
dwCompMgmtStatus
CJ_DWORD
0… 4294967296
sec
Status of the function block.
NOTE: For more information on
the compressor mode refer to
dwCompMgmtStatus
(see page 261).
wElapsedOnTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum On time elapsed.
wElapsedOffTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum Off time elapsed.
wElapsedCycleTime
CJ_WORD
0… 65535
sec
Remaining time before the
minimum cycle time elapsed.
wAlarmID
CJ_WORD
0… 65535
N/A
Alarm ID
dwCompMgmtStatus
Bit 0-23 operating hours ( max. 16.777.216 hours)
Bit 24: reserved
Bit 25: reserved
Bit 26-27: compressor mode 1 = auto, 2 = manual, 3 = maintenance
Bit 28: ON-timer active
Bit 29: OFF-timer active
Bit 30: Cycle timer active
Bit 31: Alarm
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The following table details the compressor mode desciption for bit 25 and bit 26:
Bit 26
Bit 25
Compressor mode description
0
0
Compressor FB disabled
0
1
Auto
1
0
Manual
1
1
Maintenance
Normal Operation with xCompCommand and wFreq
The output xCompCommand enables the variable speed drive and wFreq is the frequency set-point
for the variable speed drive..
The output xCompCommand is controlled by the input xStart.
If...
Then...
xStart is set to 1
the output xCompCommand is set to 1 and the
variable speed drive frequency wFreq is controlled.
wSetp is lower than wMinSetp
the output wFreq is set to the minimum frequency
wMinSetp.
xStart is set to 0
the output xCompCommand is set to 0 and the
variable speed drive frequency wFreq is set to 0.
NOTE: wMinSetp must be lower than 100.0%.
To avoid that the compressor is stopped and started too often, you can set the duration:
wMinOnTime, wMinOffTime and wMinCycleTime.
278
If...
Then...
the timer wMinOffTime has not elapsed
the compressor is not started.
the time duration during 2 starts of the compressor is
lower than wMinCycleTime
the compressor is not started.
the compressor has the order to stop and the
wMinOnTime has not elapsed
wFreq is set to wMinFreq.
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Alarm ID Description
The AlarmID output represents a value from 0 to 31, whereby each bit represents a detected
alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
The parameter wMinFreq is higher
than the parameter wMaxFreq.
The compressor is stopped.
1
The parameter wMinSetp is higher
than 100.0 %.
2
The value of the input byMode is
invalid.
3
wCompMgmtAlarmID input is not
equal to 0.
4-15
not used
N/A
Troubleshooting
In case of an alarm the compressor is stopped and the function block goes into alarm state. If the
compressor goes into normal state, it is automatically restarted after the timers wMinCycleTime
and wMinOffTime have elapsed:
Alarm
Problem
Effect
wAlarmID.0 TRUE
Parameter wMinFreq is higher than
the parameter wMaxFreq.
Check the parameter ranges.
Set the value within the defined range.
wAlarmID.1 TRUE
Parameter wMinSetp is higher than
100.0 %.
wAlarmID.2 TRUE
The value of the input byMode is
invalid.
wAlarmID.3 TRUE
wCompMgmtAlarmID input is not
equal to 0.
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Check the alarms of the function block
CompAlarmMgmt.
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CompAlarmMgmt
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Chapter 21
Compressor Alarm Management: CompAlarmMgmt
Compressor Alarm Management: CompAlarmMgmt
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
21.1
Functional Overview
282
21.2
Pin Description
283
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CompAlarmMgmt
Section 21.1
Functional Overview
Functional Overview
CompAlarmMgmt Function Block Description
Function Block Description
The CompAlarmMgmt function block is used to detect alarms of a compressor in a chiller unit.
Why Use the CompAlarmMgmt Function Block?
The CompAlarmMgmt function block provides the following purposes:
The CompAlarmMgmt function block manages up to 7 different alarms for a single compressor.
Each alarm can be configured with an individual alarm delay time.
 The CompAlarmMgmt simplifies programming.

Features of the CompAlarmMgmt Function Block
The CompAlarmMgmt function block provides the following features:
 Emergency alarm
 Motor alarm
 Oil pressure switch alarm
 High / low pressure switch alarm
 High / low pressure sensor alarm
 Generic alarm
 Individual alarm delays
 Enable / disable alarm
 Manual reset (see page 295)
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
282
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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Section 21.2
Pin Description
Pin Description
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Pin Description
Pin Diagram
The following picture shows the pin diagram of CompAlarmMgmt:
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Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
xEStop
CJ_BIT
TRUE or FALSE
N/A
Emergency Stop
NOTE: Reset when not
active.
NOTE: When xEStop is set
to TRUE, the emergency
stop alarm cannot be reset.
xMotorAlarm
CJ_BIT
TRUE or FALSE
N/A
Motor alarm (for example
circuit breaker,
thermoswitch)
NOTE: Reset when not
active.
NOTE: When
xMotorAlarm is set to
TRUE, the motor alarm
cannot be reset.
xOilPresSwitch
CJ_BIT
TRUE or FALSE
N/A
Oil pressure switch alarm
NOTE: Reset when not
active.
NOTE: When
xOilPresSwitch is set to
TRUE, the oil pressure
switch cannot be reset.
xHPSwitch
CJ_BIT
TRUE or FALSE
N/A
High pressure switch alarm
NOTE: Reset when not
active.
xLPSwitch
CJ_BIT
TRUE or FALSE
N/A
Low pressure switch alarm
NOTE: Can be reset when
active.
xGenericAlarm
CJ_BIT
TRUE or FALSE
N/A
Generic Alarm
NOTE: When the input
xGenericAlarm is set to
TRUE, the timer
wDelayGenericAlarm is
started and the generic
alarm cannot be reset.
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Input
Data Type
Range
Scaling / Unit
Description
xCompCommand
CJ_BIT
TRUE or FALSE
N/A
Compressor command
TRUE: compressor is
running.
FALSE: compressor is
stopped.
NOTE: When
xCompCommand is set to
FALSE, an alarm cannot be
reset.
CJ_SHORT
- 32768… 32767
0.01 bar
High pressure current value
shLPValue
CJ_SHORT
- 32768… 32767
0.01 bar
Low pressure current value
shMaxHPLimit
CJ_SHORT
- 32768… 32767
0.01 bar
Maximum value of the high
pressure
shHPValue
NOTE: Reset when not
active.
shMinLPLimit
CJ_SHORT
- 32768… 32767
0.01 bar
Minimum value of the low
pressure
NOTE: Can be reset when
active.
wDelayEnAlarm
CJ_WORD
0…65535
sec
Start delay for LP switch and
LP alarm when the
compressor is running.
NOTE: The timer
wDelayEnAlarm is started
when the input
xCompCommand is set to
TRUE.
wDelayMotorAlarm
CJ_WORD
0…65535
sec
Delay for the motor alarm
NOTE: The timer
wDelayMotorAlarm is
started when the input
xMotorAlarm is set to
TRUE.
wDelayOilPresSwitch CJ_WORD
0…65535
sec
Delay for the oil pressure
switch alarm
NOTE: The timer
wDelayOilPresSwitch is
started when the input
xOilPresSwitch is set to
TRUE.
wDelayHPSwitch
286
CJ_WORD
0…65535
sec
Delay for the HP switch
alarm
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Input
Data Type
Range
Scaling / Unit
Description
wDelayLPSwitch
CJ_WORD
0…65535
sec
Delay for the LP switch
alarm.
NOTE: The timer
wDelayLPSwitch is started
when the input xLPSwitch
is set to TRUE.
wDelayGenericAlarm
CJ_WORD
0…65535
sec
Delay for the generic alarm
wDelayHPAlarm
CJ_WORD
0…65535
sec
Delay for the HP alarm
NOTE: The timer
wDelayHPAlarm is started
when the high pressure
wLPValue is higher than the
high pressure limit
wHPMaxLimit.
wDelayLPAlarm
CJ_WORD
0…65535
sec
Delay for the LP alarm
NOTE: The timer
wDelayLPAlarm is started
when the low pressure
wLPValue is lower than the
low pressure limit
wLPMinLimit.
wDisableAlarm
CJ_WORD
0…65535
N/A
Disable some alarms
(optional)
xReset
CJ_BIT
TRUE or FALSE
N/A
Resets the alarms which are
not active or which can be
reset when active.
xEn (Enable)
If the function block is disabled, the outputs wAlarmID and xAlarm are set to 0 and the alarms
are reset, even if all the alarms are active.
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
xAlarm
CJ_BIT
TRUE or FALSE
N/A
Alarm
wAlarmID
CJ_WORD
0… 65535
N/A
Alarm identification
NOTE: If the function block is disabled, the outputs wAlarmID and xAlarm are set to 0 and the
alarms are reset even if all the alarms are active.
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CompAlarmMgmt
Motor Alarm
The timer wDelayMotorAlarm is started when the input xMotorAlarm is set to TRUE.
A motor alarm can be detected when the motor alarm detection is enabled.
A motor alarm is detected when the input xMotorAlarm is set to TRUE and the timer wDelayMotorAlarm has elapsed.
NOTE: The detected motor alarm can be reset when the input xMotorAlarm is FALSE and the
reset input xReset is set to TRUE.
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Oil Pressure Switch Alarm
The timer wDelayOilPresSwitch is started when the input xOilPresSwitch is set to TRUE.
An oil pressure switch alarm can be detected when the oil pressure switch alarm detection is
enabled.
An oil pressure switch alarm is detected when the input xOilPresSwitchAlarm is set to TRUE
and the timer wDelayOilPresSwitchAlarm has elapsed.
NOTE: The detected oil pressure switch alarm can be reset when the input xOilPresSwitchAlarm is FALSE and the reset input xReset is set to TRUE.
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CompAlarmMgmt
High Pressure Switch Alarm
The timer wHPSwitch is started when the input xHPSwitch is set to TRUE.
A high-pressure switch alarm can be detected when the high-pressure switch alarm detection is
enabled.
A high-pressure switch alarm is detected when the input xHPSwitch is set to TRUE and the timer
wDelayHPSwitchAlarm has elapsed.
NOTE: The detected high-pressure switch alarm can be reset when the input xHPSwitch is
FALSE and the reset input xReset is set to TRUE.
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Low-Pressure Switch Alarm
The timer wDelayEnAlarm is started when the input xCompCommand is set to TRUE. The timer
wDelayLPSwitch is started when the input xLPSwitch is set to TRUE.
A low-pressure switch alarm can be detected when the low-pressure switch alarm detection is
enabled.
A low-pressure switch alarm is detected when the input xLPSwitch is set to TRUE and the timers
wDelayEnAlarm and wDelayLPSwitch have elapsed.
NOTE: The detected low-pressure switch alarm is reset when the input xReset is set to TRUE.
The detected low-pressure switch alarm is not reset when the compressor is stopped
(xCompCommand is FALSE).
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Emergency Stop Alarm
An emergency stop alarm can be detected when the emergency stop alarm detection is enabled.
An emergency stop alarm is detected when the input xEStop is set to TRUE.
NOTE: The detected emergency stop alarm can be reset when the input xEStop is FALSE and
the reset input xReset is set to TRUE.
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Generic Alarm
The timer wDelayGenericAlarm is started when the input xGenericAlarm is set to TRUE.
A generic alarm can be detected when the generic alarm detection is enabled.
A generic alarm is detected when the input xGenericAlarm is set to TRUE and the timer
wDelayGenericAlarm has elapsed.
NOTE: The detected motor alarm can be reset when the input xGenericAlarm is FALSE and the
reset input xReset is set to TRUE.
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CompAlarmMgmt
High-Pressure Alarm
The timer wDelayHPAlarm is started when the high-pressure wLPValue is higher than the highpressure limit wHPMaxLimit.
A high-pressure alarm can be detected when the high-pressure alarm detection is enabled.
A high-pressure alarm is detected when the input shHPValue is above the high-pressure limit
(shHPMaxLimit) and the timer wDelayHPAlarm has elapsed.
NOTE: The detected high-pressure alarm can be reset when the input shHPValue is below the
high-pressure limit (shHPMaxLimit) and the reset input xReset is set to TRUE.
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Low-Pressure Alarm
The timer wDelayEnAlarm is started when the input xCompCommand is set to TRUE.
The timer wDelayLPAlarm is started when the low-pressure wLPValue is lower than the lowpressure limit wLPMinLimit.
A low-pressure alarm can be detected when the low-pressure alarm detection is enabled.
A low-pressure alarm is detected when the input shLPValue is below the low- pressure limit
(shLPMinLimit) and the timer wDelayLPAlarm has elapsed.
NOTE: The detected low-pressure alarm can be reset when the input shLPValue is above the
low-pressure limit (shLPMinLimit) and the reset input xReset is set to TRUE.
Alarm Reset
When the input xReset is set to TRUE, the outputs wAlarmID and xAlarm are set to 0 if the
following alarms are not active:
 motor alarm
 oil pressure switch alarm
 high-pressure switch alarm
 emergency stop alarm
 generic alarm
 high-pressure alarm
The outputs wAlarmID and xAlarm can be reset even when the following alarms are active:
low-pressure switch alarm
 low-pressure alarm

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CompAlarmMgmt
Alarm Disable wDisableAlarm
An alarm can be disabled by setting the bit of the input wDisableAlarm to TRUE. The bits and
the alarms are described in the following table:
wDisableAlarm
Alarm
wDisableAlarm.0 TRUE
Motor alarm is inactive.
wDisableAlarm.1 TRUE
Low pressure switch alarm is inactive.
wDisableAlarm.2 TRUE
High pressure switch alarm is inactive.
wDisableAlarm.3 TRUE
Low pressure switch alarm is inactive.
wDisableAlarm.4 TRUE
Emergency stop alarm is inactive.
wDisableAlarm.5 TRUE
Generic alarm is inactive.
wDisableAlarm.6 TRUE
High pressure alarm is inactive.
wDisableAlarm.7 TRUE
Low pressure alarm is inactive.
The following graphic shows an example for alarm disable of an emergency stop alarm:
NOTE: If an alarm is active when being disabled, the outputs wAlarmID and xAlarm and the
timers are reset.
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Alarm ID Description
The AlarmID output represents a value between 0 and 31, whereby each bit represents a
detected alarm. The table contains the bits and their description:
Alarm Bit
Alarm Cause
Effect
0
Motor alarm is active.
The compressor is stopped.
1
Oil pressure switch alarm is active.
2
High pressure switch alarm is active.
3
Low pressure switch alarm is active.
4
Emergency stop is active.
5
Generic alarm is active.
6
High pressure alarm is active.
7
Low pressure alarm is active.
8-15
not used
N/A
Troubleshooting
In case of an alarm the compressor is stopped and the function block goes into alarm state. If the
compressor goes into normal state, it is automatically restarted after the timers wMinCycleTime
and wMinOffTime have elapsed:
Alarm
Problem
Solution
wAlarmID.0 TRUE
Motor alarm is active.
Check the state of the circuit breaker or of
the thermo switch of the compressor.
wAlarmID.1 TRUE
Oil pressure switch alarm is active.
Check the state of the oil pressure switch.
wAlarmID.2 TRUE
High pressure switch alarm is active.
Check the state of the high pressure switch.
wAlarmID.3 TRUE
Low pressure switch alarm is active.
Check the state of the low pressure switch.
wAlarmID.4 TRUE
Emergency stop is active.
Check the state of the emergency stop.
wAlarmID.5 TRUE
Generic alarm is active.
Check the state of the generic alarm.
wAlarmID.6 TRUE
High pressure alarm is active.
Check the value of the high pressure.
wAlarmID.7 TRUE
Low pressure alarm is active.
Check the value of the low pressure.
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PIDAutoTuning
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Chapter 22
PID Autotuning: PIDAutoTuning
PID Autotuning: PIDAutoTuning
What Is in This Chapter?
This chapter contains the following sections:
Section
Topic
Page
22.1
Functional Overview
300
22.2
Pin Description
303
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PIDAutoTuning
Section 22.1
Functional Overview
Functional Overview
PIDAutoTuning Function Block Description
Function Block Description
The PIDAutoTuning function block measures the dynamic response of a control system and
calculates automatically the parameters Ti (integral time in seconds) and Kp (proportional gain)
for that control system. These parameters can be connected to the parameter inputs of a PID AFB
(for example PIDAdvanced).
NOTE: This function block must be used together with the PIDAdvanced.
When autotuning is enabled, it induces oscillations in the process around the set-point. After the
completion of 3 oscillations, autotuning calculates a set of PI parameters.
NOTE: During the autotuning process the system is set to the minimum and maximum operating
limits to measure the process response time. Ensure that the minimum and maximum operating
limits are set correctly.
WARNING
UNINTENDED EQUIPMENT OPERATION


Only qualified persons with the skills and knowledge of electrical control systems, and having
the related safety training, are allowed to program, install, alter, and otherwise apply this
product.
Understand and follow all local, regional, and national safety codes and standards.
Failure to follow these instructions can result in death, serious injury, or equipment
damage.
Why Use the PIDAutoTuning Function Block?
The PIDAutoTuning function block is used to calculate the KP and Ti parameters for the control
system.
Features of the PIDAutoTuning Function Block
The PIDAutoTuning function block provides the following features:
 Manual / automatic PI calculation
 Calculates 3 series of Kp and Ti: aggressive, medium, and slow control.
 Direct / reverse control
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Required Actions Before Autotuning
Proceed as follows before starting autotuning:
1 Ensure that the process value and the setpoint have the same unit and precision.
2 Ensure that the process value shPv is not a fluctuating signal.
If you get shPv with a fluctuating signal, try to smooth the process value by using Average AFB
(AFB to calculate the average value).
3 Check if your system is direct (for example, heating) or inverse (for example, cooling).
If your system is inverse, set xInversCntrl to TRUE.
4 Check the plausibility of the process value shPv.
The measured process value must be plausible outside of the PIDAutoTuning function block.
5 Check the set-point shSp limits.
Outside of the PIDAutoTuning function block, you have to ensure, that the set-point limit is
checked by your program.
If the limits are exceeded, you have to ensure that this is not a potential danger to personal
health or your system.
6 Enable the PIDAutoTuning function block.
NOTE: Due to the alarms of the periphery (for example, emergency stop) you have to ensure that
the PIDAutoTuning function block is disabled and xStartAutotune is set to 0.
NOTE: A fluctuating process value gives an incorrect calculation.
Start Autotuning
Proceed as follows to start autotuning:
1 Set the set-point shSetP to the working process value shPv.
2 Set xStartAutoTune to TRUE.
3 Wait
Starting autotuning (xInversCntrl = 0)
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Starting autotuning (xInversCntrl = 1)
NOTE: Autotuning is finished when xStartAutoTune is set from TRUE to FALSE.
Protective Features
The function block provides the following protective feature to help avoid certain sources of
machine malfunction:
302
Protective Feature
Description
Input range validation
Inputs and parameter ranges are validated to help prevent out
of range data from being accepted directly.
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PIDAutoTuning
Section 22.2
Pin Description
Pin Description
Pin Description
Pin Diagram
The following picture shows the pin diagram of PIDAutoTuning:
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PIDAutoTuning
Input Pin Description
Input
Data Type
Range
Scaling / Unit
Description
xEn
CJ_BIT
TRUE or FALSE
N/A
Enables the function block.
xStartAutoTune
CJ_BIT
TRUE or FALSE
N/A
A rising edge activates auto- tuning
TRUE: the autotuning process
starts on a rising edge.
FALSE: autotuning is disabled
xInversCntrl
CJ_BIT
TRUE or FALSE
N/A
Inverses the control.
TRUE: Active (for example, for
cooling systems)
FALSE: Not active (for example,
for heating systems)
byMode
CJ_BYTE
0...3
N/A
Changes the PI parameters of the
outputs shKp and wTi.
0= Manual parameter
1= ATR Para (slow)
2= ATR Para (medium)
3= ATR Para (aggressive)
NOTE: If you have not performed
autotuning before, set byMode to 0
(manual parameters).
shPv
CJ_SHORT
TRUE or FALSE
N/A
Process value
shSetp
CJ_SHORT
-3276.8…3276.7
0.1/user unit
Set-point
NOTE: shSetP is the value of the
set-point, the future working
process value for the
PIDAdvanced AFB.
NOTE: Reset when not active.
shManualKp
CJ_SHORT
-300.00...+300.00
0.01/user unit
Manual value of proportional gain
configured by you.
NOTE: The value is active at shKp
if byMode is set to 0.
wManualTi
CJ_WORD
0...60000
seconds
Manual value of integral time
configured by you.
NOTE: The value is active at wTi if
byMode is set to 0.
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Input
Data Type
Range
Scaling / Unit
wHighLimit
CJ_WORD
0.00...100.00
0.01 %
Description
High limit of PID output.
NOTE: wHighLimit of the
PIDAdvanced AFB must have the
same value.
wLowLimit
CJ_WORD
0.00...100.0
0.01 %
Low limit of PID output.
NOTE: wLowLimit of the
PIDAdvanced AFB must have the
same value.
shSetP, shPv
If the process value is fluctuating, the Average AFB must be used.
When the filter time is set, you get the average process value for the entered filter time. A
fluctuating signal causes a wrong calculation of the PI parameters.
NOTE: The set-point shSetP and the process value shPv must be of the same unit and precision.
xInversCntrl
If xInversCntrl is set to TRUE, the input xInversCntrl inverts the calculation.
Example:
If...
Then...
the output wAutoTuneValue is 100.00% and
shPv increases
set xInversCntrl to FALSE.
the output wAutoTuneValue is 100.00% and set xInversCntrl to TRUE.
shPv decreases
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PIDAutoTuning
wLowLimit, wHighLimit


These parameters define the range of your process (wAutoTuneValue).
The PID controller (for example, PIDAdvanced AFB) must have the same values. The
maximum range is 0.00 to 100.00%.
NOTE: In oversized or undersized systems it is necessary to specify other ranges (for example,
0.00 to 50.00 for an oversized system).
Example:
wHighLimit = 50.00 (%)
wLowLimit = 0.00 (%)
or
wHighLimit = 25.00 (%)
wLowLimit = 0.00 (%)
Results:
 The PIDAutoTuning AFB controls the output wAutoTuneValue between 0.00 and 50.00 %.
 The process value increases slower (for example temperature).
 The calculated PI parameters work better for an oversized system.
byMode
306
0 = manual
Manual PI- parameters are set to the outputs
shKp and wTi
1 = slow
Calculated PI- parameters are set to the
outputs shKp and wTi.
2 = medium
Calculated PI- parameters are set to the
outputs shKp and wTi
3 = aggressive
Calculated PI- parameters are set to the
outputs shKp and wTi.
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PIDAutoTuning
Output Pin Description
Output
Data Type
Range
Scaling / Unit
Description
xAutoTune
CJ_BIT
TRUE or FALSE
N/A
TRUE: Autotuning process
is active.
FALSE: Autotuning process
is not active.
NOTE: If xAutoTune is set
from TRUE to FALSE (falling
edge), autotuning is finished.
NOTE: It is possible to
connect this output directly
to the input xAutoTune of
the PIDAdvanced AFB.
wAutoTuneValue
shKp
CJ_WORD
CJ_SHORT
wLowLim to
wHighLim
0.01 %
-300.00... +300.00
0.01/user unit
Analog output
NOTE: It is possible to
connect this output directly
to the input
wAutoTuneValue of the
PIDAdvanced AFB.
Manual or calculated Kp
NOTE: It is possible to
connect this output directly
to the input shKp of the
PIDAdvanced AFB.
wTi
CJ_WORD
0...60000
seconds
Manual or calculated Ti
NOTE: It is possible to
connect this output directly
to the input wTi of the
PIDAdvanced AFB.
wMessageID
CJ_WORD
0 - 65535
N/A
Message identification
wAlarmID
CJ_WORD
0 - 65535
N/A
Alarm identification
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PIDAutoTuning
wMessageID
Message Bit
Message Cause
Effect
0
Tuning is in progress.
Autotuning is active.
1
Tuning is completed.
System OK
Autotuning is finished and
the controlling was
successful.
2
Tuning is completed.
System is oversized.
Autotuning is finished and
the calculated PI
parameters indicates an
oversized system.
The calculated parameters
or manual values can be
used.
3
Tuning is completed.
System is undersized.
Autotuning is finished and
the calculated PI
parameters indicates an
undersized system.
The calculated parameters
or manual values can be
used.
4-15
not used
N/A
308
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PIDAutoTuning
Troubleshooting wMessageID
Message ID
Problem
Solution
wMessageID.0 TRUE
The values of some inputs are not set within the valid
range, for example byMode > 5.
Set valid values.
wMessageID.3 TRUE
Autotuning was finished and the measurement detected a
non-homogeneous system.
If for example the heater is
oversized for the working
temperature:
 change the heater.
 if it is not possible to
modify the system,
check the parameters
wLowLimit and
HighLimit.
 start autotuning again, or
set manual PI
parameters (byMode =
0”).
wMessageID.4 TRUE
Autotuning was finished and the measurement detected a
non-homogeneous system.
If for example the heater is
undersized and parameters
do not work:
 Set manual PI
parameters (byMode =
0”).
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PIDAutoTuning
Alarm ID
The table contains the bits of wAlarmID and their description:
Alarm Bit
Alarm Cause
Effect
0
Invalid cycle time.
1
Invalid input limit parameters (wHighLimit, wLowLimit)
2
Invalid manual PI- parameters (shManualKp,
wManualTi)
wAnalog is set to 0 and
autotuning will not start or
will be canceled.
3
Invalid PID parameter (shKp, wTi, wTd)
4
xInversCntrl is changed during autotuning is running.
5
The calculated PID parameters are incorrect and the
parameters cannot be calculated for this system.
 Autotuning is finished
–
–
6-15
310
and the controlling
detected an incalculable
system.
 wAnalog is set to 0 and
autotuning will not start
or will be canceled.
 The previously
calculated PI
parameters (shKp, wTi)
will be deleted.
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PIDAutoTuning
Troubleshooting AlarmID
The table contains the bits of wAlarmID and their description:
AlarmID
Problem
Solution
wAlarmID.0 TRUE
Cycle time < 0 msec
Cycle time > 2000 msec
The application is too large.
Reduce the application and
check the cycle time.
wAlarmID.1 TRUE
wHighLimit > wLowLimit)
wHighLimit > 100.00
wLowLimit = wHighLimit
Check the parameter range.
wAlarmID.2 TRUE
shManualKp < -300.00
shManualKp > +300.00
wManualTi < 0
wManualTi > 60000
Check the parameter range.
wAlarmID.3 TRUE
Invalid mode value:
byMode < 0
byMode > 3
Check the parameter range.
wAlarmID.4 TRUE
xInversCntrl changes during auto- tuning
Do not change the value as
long as autotuning is in
progress.
wAlarmID.5 TRUE
 Auto- tuning run for a long time (>45 minutes).
 The system is slow.
 The message Tuning completed system is
 Wait for a maximum of
incalculable will be shown.
45 min.
 Stop autotuning.
 Set the PI parameters
manually.
wAlarmID.5 TRUE
 Internal variables detected values which are not
calculable (for example Time1<=1 second or
Time4>2700 seconds).
 There is a fluctuating signal of the actual process value
(but you cannot see it in the program).
 The message Tuning completed system is
incalculable will be shown.
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If the parameters do not
work, set the manual PI
parameters (byMode = 0).
311
PIDAutoTuning
312
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SoHVAC
Glossary
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Glossary
A
AFB
Application Function Block
AHU
Air Handling Unit
AHUPlantModeStrategy
AHU Plant Mode Strategy
AHUTempCntrlStrategy
AHU Temperature Control Strategy
C
CCS
Cooling Coil Signal
CompAlarmMgmt
Compressor Alarm Management
CompCntrl_CSH
Compressor control for semi-hermetic compressors
CompCntrl_OnOff
Compressor control for generic on/off ompressors
CompCntrl_VS
Compressor control for variable speed ompressors (screw/piston)
COP
Coefficient of Performance
Counter2Energy
Converts totalized pulses in energy meter
D
DAT
Discharge Air Temperature
DCS
Damper Control Signal
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Glossary
Deadband
A range of the controlled variable in which no corrective action is taken by the controlled system
and no energy is used.
E
EIML
Embedded Interface Markup Language
EnergyMeterModbusCom
Energy meter modbus communication module for iEM3xxx meters
EnergyTrend
Energy meter data trend
F
FanMgmt
Fan Management
FB
Function Block
FCS
Fan Control Signal
FloatingPresHighCntrl
Floating Pressure High Control
H
HCS
Heating Coil Signal
HVAC
Heating, Ventilation and Air Conditioning
HVAC&R
Heating, Ventilation, Air Conditioning and Refrigeration
I
IEEE
(institute of electrical and electronics engineers ) A non-profit international standards and
conformity assessment body for advances in electrotechnology.
314
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Glossary
M
Modbus
The protocol that allows communications between many devices connected to the same network.
Modbus master time–out
The period where the master waits for an answer from the slave on a Modbus request. If no answer
is received in this period, then the Modbus message is cancelled and the master starts with a new
Modbus request.
N
NC
Night Cycle
NIPU
Night Purge
O
OAT
Outdoor Air Temperature
P
PAR
Parameter
PID
The Proportional, Integral and Derivative control is a generic control loop feedbackmechanism
(controller) widely used in industrial control systems.
PIDAdvanced
PID control function block
PIDAutotuning
PID autotuning block
Pulse2Counter
Totalizer for digital input pulses
R
RAT
Return Air Temperature
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Glossary
RMT
Room temperature
V
VSD
Variable Speed Drive
W
WtrTempDbCntrol
Water Temperature Deadband Control
316
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SoHVAC
Index
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Index
A
AHUPlantModeStrategy, 51
AHUTempCntrlStrategy, 21
ATV••ModbusCom / ATV••• ModbusCom, 73
ATV12ModbusCom, 73
ATV212ModbusCom, 73
ATV21ModbusCom, 73
ATV312ModbusCom, 73
ATV31ModbusCom, 73
ATV32ModbusCom, 73
ATV61ModbusCom, 73
ATV71ModbusCom, 73
Pulse2Counter, 211
T
ThermalPowerCalculation, 201
W
WtrTempDbCntrl, 179
C
CompAlarmMgmt, 281
CompCntrl_OnOff, 263
CompCntrl_Slider, 251
CompCntrl_VS, 269
CompMgmt, 89
COPCalculation: Coefficient of Performance,
207
Counter2Energy, 217
E
EnergyMeterModbusCom, 227
EnergyTrend, 221
F
FanMgmt, 113
Float2Long, 233
FloatingHighPresCntrl, 141
FloatingSetpoint, 163
P
PIDAdvanced, 239
PIDAutoTuning, 299
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317
Index
318
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