Metasys Network Technical Manual Glossary

Metasys Network Technical Manual Glossary
Metasys Network Technical Manual 636
Glossary Section
Technical Bulletin
Issue Date 1092
Glossary
Access Controller
object
The hardware object that defines the interface between the D600
Controller and the NCM.
Accumulator (ACM)
object
The software representation of a binary input device that measures flow or
consumption by monitoring a rate of contact or voltage change.
ACM
See Accumulator object.
active hub
A multi-port repeater used in an N1 LAN star or mixed network
configuration to transmit messages and to provide electrical isolation for
each node in the network.
active link
A 2-port repeater used in an N1 LAN or mixed network configuration if
the signal must be regenerated.
AHU Controller
An Application Specific Controller used for Air Handling Unit (AHU)
operations. The AHU may be used as a standalone unit, or connected to
the N2 Bus as an element in a Metasys Network.
alarm latching
The capability of defining a Binary Input object or a Binary Data object as
a latching point. When an alarm condition occurs, the object remains in
the alarm state until an operator or control process issues an Unlatch
command.
Analog Data (AD)
object
A point object derived from an analog value that was obtained as the result
of a control process, operator entry, or attribute from another object.
Analog Input (AI)
object
The software representation of a hardware device that is monitoring an
analog value.
Analog Output
Digital (AOD) object
The software representation of a control output used in positioning valves,
dampers, and other proportional devices. The AOD object is generally
used in conjunction with the PID Loop object.
©
1992 Johnson Controls, Inc.
Order No. 636-355
1
Analog Output
Setpoint (AOS)
object
The software representation of an analog output device used in position
control or remote setpoint adjustment.
Application Specific
Controller (ASC)
A family of standalone control devices with hardware and software
preconfigured to meet the functional needs of a specific application.
ARCNET
The 2.5 megabit/sec., token-passing Local Area Network protocol
developed by Datapoint Corporation. A baseband network, which
transmits digital signals one message at a time. The Metasys N1 LAN
uses ARCNET.
ASC
See Application Specific Controller.
attribute
A characteristic or property of an object (e.g., a low limit of an analog
point) that describes the object status and makes it unique.
AUTO
A command that releases the Override command and allows other lower
priority inputs to change the current value.
Auto Restore
A function that restores a device to its correct commanded condition when
either communication is resumed after a failure or the NCM is restarted.
Binary Data (BD)
object
A point object derived from a binary value that was obtained as the result
of a control process, operator entry, or attribute from another object.
Binary Input Alarm
Point
One of up to eight binary inputs attached to a Smart Terminal Interface
(STI). Binary input alarm points are used to identify breaches in security.
Binary Input (BI)
object
The software representation of a Binary Input device that is monitoring a
2-state (On/Off) field condition.
Binary Output (BO)
object
The software representation of a 2-state (On/Off) controlled device.
Blink
An optional user-programmable feature of an Intelligent Lighting
Controller that momentarily turns Off the lights in a lighting group to
notify occupants that the lights are about to be turned off.
Buffer
Process of temporarily storing data in register or in RAM, that allows
transmission devices to accommodate differences in data rates and to
perform error checking and re-transmission of data received in error.
bumpless transfer
A software feature that tracks the difference between setpoint and
feedback, then gradually resolves the differences to reach setpoint when
control changes from manual to automatic operating modes.
2 Glossary
bus
A transmission path wherein devices on a given medium receive all
transmissions at the same time, but process only those addressed to them.
bus network
One of three available configurations for the Metasys N1 LAN. The bus
network configuration consists of a layout in which the nodes are
connected in a daisy chain fashion.
C210 Controller
A preprogrammed Application Specific Controller with standalone
capabilities used primarily for the monitoring and control of Variable Air
Volume (VAV) box controllers.
C260 Controller
A preprogrammed Application Specific Controller with standalone
capabilities used primarily for water source heat pump control.
CAL1 (Custom
Applications
Language One)
A programming language used to define the programs and data base of the
DSC-8500 hardware object.
Card Reader
A device that translates information on an access card and sends it, via a
Smart Terminal Interface (STI), to the D600 Controller data base for
verification. Up to 16 card readers can be included in an IAC-600 Access
Control System.
Card Reader object
A software object that represents one Smart Terminal Interface/Card
Reader combination in an IAC-600 Access Control System.
Change-of-State
(COS)
For a point object, the act of transferring from one condition to another in
realtime (e.g., a Binary Input point object changing from Normal to
Alarm).
Change-of-State
Reporting
Passing of a COS event to an Input/Output (I/O) device for priority
display.
Cleaning Crew
An ILC feature that interlocks lighting groups so janitorial crews can turn
On assigned lighting groups in the area about to be cleaned. This
automatically turns Off lights in the previous cleaning area.
Cold Start
Restarting the Network Control Module so that it is operating out of
Erasable Programmable Read-Only Memory (EPROM) based code.
When the Network Control Module is cold started, both code and data
need to be downloaded and stored within Dynamic Random-Access
Memory (DRAM) to return to normal operations. Contrast with warm
start.
Glossary
3
Communication
Terminal Board (TBC)
A termination board that allows NCU communication across the N1 LAN.
The board also terminates the N2 and L2 Buses to the NCU/NEU.
connectivity
The ability to link together two or more computers or systems for the
purpose of communication, data transfer, etc.
control object
The name of the software definition of a specific process that combines
multiple field devices (point objects) to perform a function.
Control System (CS)
object
The software representation of selected hardware and internal points in an
Application Specific Controller (ASC). Typically, the CS object
represents one control strategy (e.g., temperature control or static pressure
control) located in a controller, though it may represent more than one
strategy.
COS
See Change-of-State.
D600 Controller
The IAC-600 System intelligent access controller, which performs security
management functions within Metasys.
Data Base Manager
A collection of subroutines (program code) used to read from and write
tasks to object records, feature records, and control strategy records.
Data Definition
Language (DDL)
Text-oriented software program for creating global and object data bases.
DDA
See Dynamic Data Access.
DDE
See Dynamic Data Exchange.
DDL
See Data Definition Language.
deadband
See normalband.
definable
The capability of being defined, applies to attributes of an object that the
operator may set a value for. For example, when you enter a System
Name and Object Name for an object, you are defining these two
attributes.
Definition window
See Object Definition window.
4 Glossary
Demand Limiting
A control strategy that monitors and compares power demand over a
sliding interval. It then projects average power demand during the interval
and temporarily turns Off selected equipment to avoid exceeding
predetermined demand peak targets.
Dial-Up I/O
A software feature that provides automatic phone connections between
NCUs and remotely located Operator Workstations and printers.
Differential
An optional software setting to reduce excessive alarm and warning
reports, caused by fluctuations above and below set limits.
Digital Control
Module (DCM)
A point interface and control module that resides in either the NCU or
NEU. It functions as a co-processor for the NCM, providing Proportional
Integral Derivative (PID) algorithms to independently regulate modulating
devices. The DCM is equipped with universal inputs and universal
outputs.
Directory Manager
A software program that facilitates information flow throughout the
network. It helps the software find attribute data quickly so information
can be passed on to other controllers and operator devices.
Disable
A command that stops an object from triggering control processes, sending
COS messages to operator devices, and accepting commands (except for
Enable).
download
Passing of a program and data bases from an operator device to a NCU.
DOS
Disk Operating System.
Dynamic Data
Access (DDA)
The communications concept designed by Johnson Controls Inc., that
allows the Metasys Network to communicate with every component on an
equal basis with complete freedom of information transfer.
Dynamic Data
Exchange(DDE)
A message passing protocol defined by Microsoft Corporation as a
Windows standard that allows the exchange of information between two
independent Windows applications.
Enable
A command that resets the Disable command and allows the object to
trigger control processes, send COS reports to operator devices, and accept
other commands.
Engineering Units
An operator-defined analog unit (such as DEGF or CFM) that has been
defined by the user to be associated with a specific value.
Glossary
5
Ethernet Router
A Metasys component that integrates Metasys N1 LAN segments with an
Ethernet network that uses the TCP/IP protocol. The router provides the
physical connection between the Metasys ARCNET segment and the
Ethernet network.
Facility Management
System (FMS)
A combined network system of Operator Workstations, Network Control
Units, Network Expansion Units, Application Specific Controllers,
Network Terminals, and points used to control and monitor a building or
group of buildings.
Feature
A software program that uses data from objects to perform building
control operations (i.e., Totalization, Demand Limiting, or Point History).
fiber optic active link
A device that is used for media conversion between coax and optical fiber.
file
See record.
Fire Controller
object
The hardware object that defines the interface between the IFC-1010 or
IFC-2020 Fire Alarm Controller and the Fire NCM.
Fire Management
A software set in the NCM that provides Metasys control over the
IFC-1010 or IFC-2020 Fire Controller.
FM
See Function Module.
FMS
See Facility Management System.
Focus window
A detailed summary that contains attributes for a specific object. See also
Object Focus window.
Function Keys
Special keys on an I/O device that can perform frequently used functions
with a single keystroke.
Function Module
(FM)
A sensor/controller conditioning device that interfaces a field device to a
DCM and in some cases an XM.
Gateway
See JC/85 Gateway.
Global Data Sharing
Generally used to describe a method of defining current point data values
as accessible to other devices. The Dynamic Data Access feature in
Metasys goes beyond Global Data Sharing by making all values and all
attributes from all network objects accessible throughout the network.
6 Glossary
GPL
See Graphic Programming Language.
Graphic
Programming
Language (GPL)
A symbol-based language used to define control strategies and object data
bases for a Metasys Network.
Group Name
One of the three hierarchical name levels for objects used to assist the user
with grouping objects within summaries more clearly at an Operator
Workstation. The other hierarchical name levels for objects are Network
Name and System Name.
Hand-Off-Auto
(HOA)
A manual hardware override switch located on the XRL Point Multiplex
Module and some Function Modules. The HOA switch either places the
contacts into the same position as if the relays were turned On (H), if the
relays were turned Off (O), or places the relays under automatic (A)
control.
Hardware Object
Manager
A software program that transmits data from the NCM to the N2 or
L2 Bus.
hardware object
record
A record that contains information on the physical location of an object
within the network.
hardware objects
The name of the software definition for an operator device, printer, or a
controller.
high voltage
A voltage value equal to or greater than 480 VAC.
HOA
See Hand-Off-Auto.
HVAC PRO
The standard Metasys software tool for creating control strategies for
Application Specific Controllers.
IAC-600 Intelligent
Access Control
System
The system that automatically controls access to a facility by the use of
access cards (badges). The IAC-600 System is comprised of a D600
Controller, up to 16 Smart Terminal Interfaces (STIs) and card readers,
and up to 128 binary input alarm points.
IAP Function Module
See Input Analog Pneumatic Function Module.
IBF Function Module
See Input Binary Frequency Function Module.
IBN Function
Module
See Input Binary Function Module.
Glossary
7
IDP Function Module
See Input Differential Pressure Function Module.
IFC-1010 Controller
A 2 loop, 198 device intelligent analog addressable fire alarm system that
performs fire management functions within Metasys.
IFC-2020 Controller
A 10 loop, 1980 device intelligent analog addressable fire alarm system
that performs fire management functions within Metasys.
ILC
See Intelligent Lighting Controller.
Input Analog
Pneumatic (IAP)
Function Module
Interfaces incoming field signals to the DCM by converting the pneumatic
input pressure signal into a proportional analog signal for use by the DCM
(multiple ranges available).
Input Binary
Frequency (IBF)
Function Module
Interfaces incoming field signals to the DCM by sensing field data (such
as rapidly cycling contact closures or input voltages), and converting the
input frequency to a DC voltage for use by the DCM.
Input Binary (IBN)
Function Module)
Interfaces incoming field signals to the DCM by converting field data
from two different binary inputs to a DC voltage range for use by the
DCM.
Input Differential
Pressure (IDP)
Function Module
Interfaces incoming field signals to the DCM by converting differential
pressure signals into a proportional analog signal for use by the DCM.
Input Universal (IUN)
Function Module
Interfaces incoming current, voltage or resistance signals to either the
DCM or to an XM that is inserted in a DCM slot.
Intelligent Lighting
Controller (ILC)
A programmable ASC that performs On/Off control of building light
circuits and other switchable loads. It can operate either as a standalone
controller or be integrated into the Metasys Network.
IUN Function
Module
See Input Universal Function Module.
JC/85 Gateway
A software set providing a special application of the NCM to integrate
Metasys object information with the JC/85 CPU. In the Gateway
application, the NCM serves as a high-level protocol translator, making
Metasys object information available to a JC/85 headend.
L2 Bus
A local communication network that connects the C210 Application
Specific Controller or the C260 Application Specific Controller to an
NCM.
8 Glossary
Lab and Central
Plant (LCP)
Controller
An Application Specific Controller used for single chiller or boiler plant
control applications, or for controlling the HVAC process of a laboratory
environment.
LAN
See Local Area Network.
Laptop Computer
A portable version of the Operator Workstation.
LCP
See Lab and Central Plant Controller.
line-voltage
A voltage value of not less than 42 VAC RMS and not more than 479 VAC.
Load Rolling
An energy saving feature that temporarily turns Off equipment to meet a
specified energy reduction target.
Load table
Used with the Demand Limiting and Load Rolling features to define
which loads have been selected as shed candidates and the priority in
which they must be shed. Each load table may have up to four priorities
defined.
Local Area Network
(LAN)
A combination of hardware and software that enables Operator
Workstations and NCMs to share data base information, hardware
resources, and application programs.
low-voltage
A voltage value of less than 42 VAC RMS.
manual commands
All available commands entered manually at an Operator Workstation or
Network Terminal.
mapping objects
Corresponding a set of values having defined parameters with the
quantities or values of another set.
message
User-defined ASCII text that can be associated with a COS report.
Metalink
An optional feature of Metasys that allows the exchange of information
between Metasys and independent third-party software applications such
as Microsoft Excel. It provides a Microsoft Windows Dynamic Data
Exchange (DDE) interface to Metasys.
Metastat
A family of temperature sensing products designed for use with
Application Specific Controllers.
Glossary
9
Metasys
An evolutionary distributed Facility Management System, designed by
Johnson Controls, Inc.
Metasys Integrator
A type of Network Control Module (NCM200) that allows qualified thirdparty controllers to be connected to the N2 Bus, much like the standard
ASCs. The connectivity provides greater flexibility in FMS design,
implementation, and system evolution.
Migration
See S2 Migration.
mixed network
One of three available configurations for the Metasys N1 LAN. The
mixed network configuration consists of a combination of the star and bus
network components.
Multiplex Binary
(XBN)
A Point Multiplex Module that monitors up to 32 binary inputs and reports
changes in their states to the NCU for processing.
Multiplex Relay
Electrically
Maintained (XRE)
A Point Multiplex Module that monitors up to eight binary inputs and
executes output commands through eight electrically maintained relays.
The XRE also reports input changes-of-state and HOA switch settings to
the NCU for processing.
Multiplex Relay
Latched (XRL)
A Point Multiplex Module that monitors up to eight binary inputs and
executes output commands through eight magnetically latched relays. The
XRL also reports input changes-of-state and HOA switch settings to the
NCU for processing.
Multiplex Relay
Momentary (XRM)
A Point Multiplex Module that monitors eight binary inputs and executes
output commands through eight momentary relay pairs. The XRM also
reports input changes-of-state and Auto/Manual switch settings to the
NCU for processing.
N1 LAN
An ARCNET local area network that interconnects NCUs and Operator
Workstations.
N2 Bus
A local Optomux network that interconnects ASCs, XMs, and NEUs to
an NCU.
NCM
See Network Control Module.
NCSETUP
A software program, running on a laptop PC or the Operator Workstation,
that configures each NCM.
10 Glossary
NCU
See Network Control Unit.
NEU
See Network Expansion Unit.
Network
A collection of Operator Workstations, printers, NTs, NCUs, NEUs,
ASCs, N1 LANs, and N2 Buses which make up a FMS.
Network Control
Module (NCM)
The main processing module in the Network Control Unit. Fully
programmable, the NCM coordinates and supervises the control activities
for all objects and control loops hardwired to the NCU, as well as the
remote NEUs and Application Specific Controllers connected to it over a
local N2, L2, or S2 Bus.
Network Control
Unit (NCU)
A standalone panel used to control a building’s mechanical equipment.
The NCU consists of an enclosure, door, and baseframe to house
electronic modules (an NCU must include a Network Control Module),
terminal blocks, and signal conditioners. It is highly flexible in hardware
and software configuration and provides direct digital control, energy
management, supervisory control, and point monitoring.
Network Expansion
Unit (NEU)
A remote field panel to expand the I/O point and control loop capacity of
the NCU. The NEU contains the same configurable modules as the NCU,
but without the NCU’s user-programmable main processor, the Network
Control Module (NCM).
Network Manager
A software program responsible for dynamically updating the screen with
realtime data.
Network Map
The first screen to appear on an Operator Workstation after logging on. It
displays the structure of the recently activated network in true diagram
form.
Network Name
One of the three hierarchical name levels for objects used to assist the user
with grouping objects within summaries more clearly at an Operator
Workstation. The other hierarchical name levels for objects are System
Name and Group Name.
Network Port
A Metasys component that monitors and controls the Metasys FMS from a
third-party computer serving as a host. The Network Port emulates the
Allen-Bradley PLC-5 Programmable Logic Controller.
Network Terminal
(NT)
A hand-held operator’s device used to access point data, change operating
parameters and schedules, and perform overrides at the NCU.
Glossary
11
Network Terminal
Emulator
An IBM PC, AT, or PS/2 computer, or a Toshiba laptop loaded with NT
Emulation software. The NT Emulator can perform the same functions as
the Network Terminal.
Network Tool Box
An optional diagnostic package for the Operator Workstation.
Network
Transparency
A characteristic of the Metasys Network. Network transparency allows
the operator to view information about a facility without knowledge of, or
restriction from the physical devices in which that information is stored.
NEU
See Network Expansion Unit.
Node
Any addressable device connected to the N1 LAN. A node can be a
Network Control Module or an Operator Workstation.
normalband
Defines the width of the normal operating range for objects.
NT
See Network Terminal.
OAE Function
Module
See Output Analog Electrical Function Module.
OAI Function
Module
See Output Analog Isolated Function Module.
OAP Function
Module
See Output Analog Pneumatic Function Module.
OBE Function
Module
See Output Binary Electrical Function Module.
object
A software data base record that corresponds to and characterizes a field
device, a data point, an N2 address, or a control function.
Object Definition
window
Used to define an object online at an Operator Workstation.
Object Focus
window
Used to view the condition of an existing object and/or modify attributes
online at an Operator Workstation.
Object Identifier
The name identifying a specific object in a system. The Object Identifier
is a 2-part name (up to 16 characters in length) consisting of a System
Name and an Object Name.
Object Manager
Software that resides in the NCU and is used to control and characterize
objects.
12 Glossary
Object Oriented
Architecture
A software design technique where information about a specific item is
stored so that it is readily available to users and application programs. All
the attributes of an object are stored at the same place as the object.
Operator
Workstation
A Personal Computer-based operator interface used for sophisticated
information management, data storage, and system programming.
Optomux
Communications protocol used on the N2 Bus.
ORE Function
Module
See Output Relay Electrical Function Module.
ORL Function
Module
See Output Relay Latched Function Module.
ORM Function
Module
See Output Relay Momentary Function Module.
OSV Function
Module
See Output Solenoid Valve Function Module.
OTE Function
Module
See Output Triac Electrical Function Module.
Output Analog
Electrical (OAE)
Function Module
Interfaces between the DCM and analog output field devices. It may be
configured to source analog output voltage, source analog output current,
or modulate current for externally powered devices.
Output Analog
Isolated (OAI)
Function Module
Provides an isolated interface between the DCM and analog output field
devices. It may be configured to source analog output voltage, source
analog output current, or modulate current for externally powered devices.
Output Analog
Pneumatic (OAP)
Function Module
Interfaces between the DCM and field devices to provide pneumatic
pressure control.
Output Binary
Electrical (OBE)
Function Module
Interfaces between the DCM and field devices to provide incremental
control of a field device.
Output Relay
Electrical Maintained
(ORE) Function
Module
Interfaces between the DCM and field devices to provide On/Off control
for the field devices via electrically maintained relays.
Output Relay
Latched (ORL)
Function Module
Interfaces between the DCM and field devices to provide On/Off control
for the field devices via magnetically latched relays.
Glossary
13
Output Relay
Momentary (ORM)
Function Module
Interfaces between the DCM and 2-state field devices to provide On/Off
control for the field devices via momentary relays.
Output Solenoid
Valve (OSV)
Function Module
Interfaces between the DCM and field devices to provide 3-way solenoid
air valve control of a pneumatic output signal to field devices.
Output Triac
Electrical (OTE)
Function Module
Interfaces between the DCM and field devices to provide
increment/decrement control.
Override
A manual command available at the Operator Workstation or Network
Terminal. It allows the operator to define a current value for an output
object at a high priority. Override replaces the current value with the userdefined value.
Password
A global security feature that restricts access to the system from the
Operator Workstation or Network Terminal.
PID Loop (PIDL)
object
Used to manipulate outputs for closed-loop control at a given Digital
Control Module. The PID Loop object is the software that generates these
outputs by using a collection of inputs and other variables to perform
calculations and issue commands.
PIN (Personal
Identification
Number) Code
A number that must be entered at a card reader keypad in order to gain
access to a facility.
PMI
Person/Machine Interface.
Point History
A feature that maintains a recent history of the values, actions, object
status, and flags associated with each point object.
Point Multiplex
Module (XM)
A family of binary sensor/controller interface devices that reside in the
NCU or NEU. See also XBN, XRE, XRL, and XRM.
point object
Software that corresponds to and characterizes field devices and data
points. There are eight types of point objects: Accumulator, Analog Data,
Analog Input, Analog Output Digital, Analog Output Setpoint, Binary
Data, Binary Input, and Binary Output.
Process
A self-sufficient, modular block of computer instructions for an NCM.
Processes are used to implement control strategies.
14 Glossary
Pseudo point
Also called Data or Duplicate point. May be a duplicate definition (copy)
of an actual physical point or the result of a calculation or logical
operation in a control process like GPL.
Ranging
A function that converts the analog-to-digital counts from the field into
data for operator use.
Realtime Operating
System (RTOS)
Johnson Controls multi-tasking operating system. It provides an
environment in which several programs can run simultaneously.
record
Formatted data representation for the Report Router.
Repeater
An adapter card that extends the length of the N2 Bus beyond 5000 feet, or
increases the number of N2 devices beyond 50.
report
A specialized grouping of displayed points not solicited by the user.
Report Router/Alarm
Management
A central distribution system for messages and files. It displays critical
Alarms in custom windows, allowing flexible operator processing of
Alarms and reports.
RTOS
See Realtime Operating System.
S2 Migration
A software set in the NCM that brings JC/85 field gear, object
information, and control directly into Metasys from the JC/85 trunks.
sample
Each individual polled event (i.e., a snapshot of parameter values).
Scheduling
A feature that allows the user to schedule commands and summaries
individually by the following parameters: time, day of week, and holiday.
Optimizes energy use while providing flexible scheduling for individual
and system variations.
Security Key
A module that plugs into the parallel port of the Operator Workstation. It
is required to run Metasys PMI software and protect from illegal use and
copying of the software.
segment
For the N1 LAN, an electrically continuous section of cable that is
terminated at both ends (i.e., does not pass through an active hub or active
link). For the N2 Bus, an electrically continuous daisy-chained cable
between repeaters or repeaters to end-of-line.
Glossary
15
Self-Tuning PID
Control
A software feature that automatically and continually modifies (fine-tunes)
PID Loop parameters to maintain a correct output value.
Smart Terminal
Interface (STI)
One of up to 16 terminals linked to the D600 Controller in an IAC-600
Access Control system. An STI controls card reader and door security
hardware, and monitors a group of local binary input alarms. Its
associated card reader reads access cards.
Software Model
A predefined set of attributes used as a default for defining Control
System (CS) software objects.
Software Object
Manager
A software program that obtains information from object records in order
to perform building control operations.
Software Object
Record
A software record that contains attribute data pertaining to the operation of
the object.
Staff Workstation
A Metasys software option that serves as a complete Metalink application.
It provides users with simple and convenient access to temperatures,
humidities, and setpoints. The source code of the application is provided
and can be customized by the applications engineer.
standalone
The ability of a controller to perform a defined set of functions without
supervisory control on any other device.
star network
One of three available configurations for the Metasys N1 LAN. The star
network configuration consists of two or more nodes connected to a multiport repeater called an active hub.
System Directory
Part of the NCM’s Directory Manager. The system directory lists which
systems are defined for each specific NCM.
System Name
One of the three hierarchical name levels for objects used to assist the user
with grouping objects within summaries more clearly at an Operator
Workstation. The other hierarchical name levels for objects are Network
Name and Group Name.
System/Object Name
See Object Identifier.
TBC
See Communication Terminal Board.
Time Manager
A software program that keeps track of the time of day, day of week, date,
holiday, and alternate or regular schedules.
16 Glossary
Time-Out
An action performed by the Operator Workstation and Network Terminal
that automatically logs off the screen if the keyboard isn’t used within a
user-specified period of time.
Time Scheduling
See Scheduling.
Token
A unique combination of software bits that grant a specific node on the N1
LAN permission to transmit.
Token bus
A Local Area Network (LAN) that features a layout in which the nodes are
wired in a daisy chain. It uses a 2-port repeater called an active link for
expansion.
Token passing
A local network access mechanism in which a token is passed from node
to node in sequential order; nodes must wait for the token to arrive for
access to the network to transmit data.
Totalization
Feature for counting the number of occurrences of particular events or
accumulating totals of the quantity of a particular commodity as it is used,
processed, or encountered. There are four types of Totalization: analog,
runtime, pulse, and event.
Trend
A user-defined monitoring feature which gathers the data needed to review
the performance of an entire building or of an individual piece of
equipment.
Triggerable
The capability of being triggered; applies to an attribute that can cause
(trigger) another operation to occur. For example, if an analog input
temperature sensor goes into high Alarm, it can cause a binary output to
start a supply fan.
Unitary Controller
(UNT)
An Application Specific Controller used for digital control of package air
handling units, unit ventilators, fan coils, heat pumps, and other terminal
units serving a single zone or room.
Upload/Download
Exchanges data between the NCM and Operator Workstation. This
process may be automatic (in the case of a NCM request following power
loss), or it may be a manual request from the user (through the Operator
Workstation).
User Programs
Executes calculations, sequences of operation, control logic, interlocks,
and other supervisory control programs written in GPL.
Glossary
17
Variable Air Volume
(VAV) Controller
An Application Specific Controller used for digital control of single duct,
dual duct, fan powered, and supply/exhaust VAV box applications.
Warm Start
Restarting the Network Control Module so that remains fully operational
following initial diagnostic tests. When the Network Control Module is
warm started, both code and data remain safely stored within Dynamic
Random-Access Memory (DRAM). Contrast with cold start.
writable
The capability of being written to; applies to attributes the operator may
modify (or write to).
XM
See Point Multiplex Module (XM).
XBN Point Multiplex
Module
See Multiplex Binary (XBN).
XRE Point Multiplex
Module
See Multiplex Relay Electrically Maintained (XRE).
XRL Point Multiplex
Module
See Multiplex Relay Latched (XRL).
XRM Point Multiplex
Module
See Multiplex Relay Momentary (XRM).
Zone object
A software object that represents one IFC-2020 fire zone residing in an
IFC-2020 Fire Alarm Controller.
Zone Terminal (ZT)
A hand-held or wall-mounted device that is used to monitor and adjust
your HVAC system within a specific building zone.
ZT
See Zone Terminal.
18 Glossary
Notes
Glossary
19
Notes
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
20 Glossary
FAN 636
Metasys Network Technical Manual
Release 4
Printed in U.S.A.
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