TBX analog
TBX AMS 620 Module Section 36.3
TBX AMS 620 Module
Subject of this section
This section introduces the TBX AMS 620 remote module.
What Is in This Section?
This section contains the following topics:
Topic
Introducing the TBX AMS 620 module
Timing of measurements on inputs
Under/Overshoot Monitoring on Inputs
Filtering Measurements on Inputs
Displaying measurements on inputs
Characteristics of the outputs
Fault handling
Output Overflow Monitoring for Module TBX AMS 620
Sensor Alignment
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Introducing the TBX AMS 620 module
General
The TBX AMS 620 base unit is an analog output module containing 6 high-level non-insulated channels and 2 insulated outputs. It must be associated to a TBX LEP 030 communicator.
This module supports the following ranges on each input :
High-level voltage,
High-level current.
This module supports the following ranges on each output :
High-level voltage,
High-level current.
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Overview
Overview of the TBX AMS 620 module associated to the TBX LEP 030 communicator:
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Description
The TBX AMS 620 module associated with the TBX LEP 030 communicator supports the following input functions :
4
5
6
2
3
Address
1
Function
acquisition of the 6 channels using multiplexing,
12 bit + sign analog digital conversion, range selection for each input: voltage, current, thermocouple,
input under/overshoot monitoring, measurement filtering, user-defined measurement formatting.
The TBX AMS 620 module associated with the TBX LEP 030 communicator supports the following output functions:
8
9
Address
7
10
Function refreshing the digital values transmitted by the processor, processing PLC dialog faults, range selection for each output: voltage, current, digital analog conversion.
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Timing of measurements on inputs
Introduction
The cycle time for the TBX AMS 620 module is fixed at 42.4 ms.
The measurements are sequenced in the following manner: channel 0, channel 1, channel 2, channel 3, channel 4, channel 5 then acquisition of two internal reference voltage channels, required for cyclical calibration.
Breakdown of the cycle time
Scanning time values:
Type of time
Scanning time for a channel
Acquisition time for a complete cycle
Illustration:
Time
5.3 ms,
42.4 ms.
NOTE:
The cycle is always identical, even when some channels are not in use,
The time required for the program to access the measurements also depends on the transmission times on the Fipio bus and on the PLC task period.
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Under/Overshoot Monitoring on Inputs
Introduction
The TBX AMS 620 module provides a choice between voltage and current ranges.
For the selected range, the module performs an overflow check: it checks that the measurement is between a lower and upper limit.
Measurement Areas
The measurement area is located in the nominal area.
Above the nominal area, the overflow is tolerated up to the overflow limits.
Illustration:
Under/Overflow Identifiers
If the values provided by the application are outside the limits, the value of the overshot limit is saturated.
The module continues to provide the converted value until saturation of the converter or the display format (+32767/-32768), even though the validity of the measurement is not guaranteed.
The user can, via the overflow bit, avoid taking these measurements into account.
Overflow bit:
Bit name
%I\2.e\0.m.c.ERR
Meaning
If equal to 1, this indicates a range overflow on the channel.
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Overflow Values of the Electrical Ranges
For voltage ranges, the module authorizes a 5% overflow for the positive electrical scope covered by the range.
Overflow values according to input type
Range
+/-10 V
0..5 V
0..20 mA
4..20 mA
Lower limit
-10.5 V
0 V: this overflow is not detected
0 V: this overflow is not detected
+3.2 mA
Upper limit
+10.5 V
+5.25 V
+21 mA
+20.8 mA
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Filtering Measurements on Inputs
Introduction
The system uses first order filtering. The filtering coefficient can be modified from a programming console or via the program.
Mathematical Formula
The mathematical formula used is as follows: where:
α = efficiency of the filter,
Mesf(n) = measurement filtered at moment n,
Mesf(n-1) = measurement filtered at moment n-1,
Valg(n) = gross value at moment n.
On configuration, you can select the filtering value from a choice of 7 values.
Values for the Module TSX AMS 620
The filter values are as follows:
Effectiveness
No filtering
Low filtering
Medium filtering 3
4
High filtering
1
2
5
6
Value to be selected Time constant
0 0 s
170 ms
339 ms
678 ms
1.35 s
2.71 s
5.42 s
Corresponding α
0
0.750
0.875
0.937
0.969
0.984
0.992
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Displaying measurements on inputs
Introduction
This process is used to select the display format depending on which formats are provided in the user program.
Standardized display of electrical ranges
The values are displayed in standardized units (in % with 2 decimals, also with symbol °/
Type of range unipolar range
0-10V, 0-5V, 0-20mA, 4-20mA bipolar range
+/-10V
Display from 0 to 10000 (0 °/ to 10000 °/ from -10000 to +10000 (-10.000 °/
).
to +10.000 °/ ).
):
User-defined display of electrical ranges
The user can select the value range in which the measurements are expressed, by selecting:
the minimum limit corresponding to the range minimum: 0 (or - 10000 °/ the maximum limit corresponding to the range maximum: + 10000 °/
The minimum and maximum limits are between -31128 and +31128.
.
),
Example:
Use of a 2/20 bar pressure sensor supplying a 0/20 mA signal and having a linear characteristic.
The user is interested in the pressure rather than the current value. The best resolution is obtained by selecting user display:
for minimum limit: 2000, for maximum limit: 20000.
The user-program then uses values expressed directly in the physical unit, the millibar.
Illustration:
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Characteristics of the outputs
Output writing
The user has access via the program to 2 words (1 16-bit word per channel) in which the values of the analog outputs are given.
from 0 to 10000 (that is 0 °/ to 10000 °/ from -10000 to +10000 (-10000 °/
) for unipolar ranges 0/20 mA and 4/20 mA,
to +10000 °/ ) for bipolar range +/-10 V.
Refreshing outputs via the module
Outputs are refreshed every 5 ms
The response time between writing the output via the program and updating the outputs to the module limits depends on the PLC task period in which the module is configured.
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Fault handling
Dialog faults with the PLC
This type of handling groups together:
setting the PLC to STOP mode (or the task in which the module is configured), a PLC fault, a link fault between the PLC and the module.
In the above cases, the user has two options for each output:
maintain the output at the current value, fallback to a defined value. The value must be selected between the normal display limits
(0/10000) for unipolar ranges or –10000/10000 for the voltage range. By default, the module is configured in fallback to 0 mode.
Internal errors in the module
When the module has an internal error the outputs are forced to 0.
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Output Overflow Monitoring for Module TBX AMS 620
Introduction
Module TBX AMS 620 includes an overflow monitoring device.
Range Specifications
The limits and accuracies of the different ranges are as follows:
Range
+/- 10V
0.20mA
4.20mA
Lower limit
-10000
0
0
Upper limit
+10000
+10000
+10000
Accuracy
Conversion over 11 bits + sign from
-2048 to +2047 points
Conversion over 11 bits from 0 to
+2047 points
Conversion over 11 bits from 0 to
+2047 points
Illustration
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Under/Overflow Identifiers
If the values provided by the application are outside the limits, the value of the overshot limit is saturated. The overflow is indicated by:
Bit name
%I\b.e\r.m.c.ERR
Meaning
If equal to 1, this indicates a range overflow on the channel.
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Sensor Alignment
Introduction
Alignment consists of eliminating a systematic shift observed with a given sensor, around a given operating point. This is used to compensate for an error linked to the process. For this reason, module replacement does not require a new alignment, though sensor replacement or a change in this sensor’s operating point do require a new alignment.
Example
Let us suppose that a pressure sensor linked to a conditioner (1mV/mB) shows 3200 mB, when the actual pressure is 3210 mB.
The value measured by the module on a standardized scale will be 3200 (3.20 V). You can align your measurement to the value 3210 (required value).
After this alignment procedure, the measurement channel will apply a systematic offset of +10.
The alignment value to enter is 3210.
Alignment Values
The alignment value can be modified from the Control Expert screen, even if the program is in
RUN.
For each input channel, you can:
Display and modify the required measurement value,
Save the alignment value,
See whether the channel already has an alignment.
The alignment offset can also be modified for each program.
The alignment is performed for each channel operating normally, with no influence on the operating modes of the module channel. The maximum variation between the measured value and the required value (aligned value) must not exceed 1000.
The alignment offset is stored in the word %MW\2.e\0.m.c.8.
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Configuring the Analog Application
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Configuring the Analog Application Chapter 37
Configuring the Analog Application
Subject of this Chapter
This chapter describes the Configuration aspect of the installation of the analog application applied to remote TBX modules.
What Is in This Chapter?
This chapter contains the following sections:
Section
37.1
37.2
37.3
Topic
Configuring a Remote TBX Analog Module: General
Analog Input/Output Channel Parameters
Configuration of Analog Parameters
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