TXP CLC Course
5
Signal Area
The signal area of the signal code is used to identify the signal source. The
different signal areas are defined below:
-A Function group control, sub-loop control
-B Control interface
-C Conventional closed-loop control
-G Binary signals conditioned by an input module
-H Binary signals created by a limit value monitor
-J Non-floating signals, not coming from specific signal area, i.e. a black box
-K Protection systems
-L Control room and control stations
-M Non-floating individual and group alarms
-N Status display computer, criteria indication
-P Supervisory computer
-Q Analog signals
-R Major closed-loop control, in addition to B and T
-S Step signal from a functional group control
-T Turbine instrumentation and control signals
-V Protective logic
-W Hard-wired alarm system
- indicates the initial character, either X or Z
Serial Number
The serial numbers used for the signal code range from 01 to 99. When the initial
character X is used the serial number assigned has a special meaning
depending on the type of signal being defined. For the initial character Z the
serial number follows no special rules. A listing of the serial numbers assigned
for each signal area is given in Signal and Application Area Assignments below.
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