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Remarks to the coordinates AZ-01 to AZ-50
The input of a coordinate, for example, AZ-01 can have a maximum
of 20 characters. To specify more complex expressions two
coordinate per gas component may be used, for example
methane
• AZ-01 Formula_Methane0 (less significant)
• AZ-02 Formula_Methane1 (highly significant)
An expression with more than 20 characters begins with the less significant coordi-
nate AZ-01 and then continues with one with higher significant AZ-02. Unused
high-order coordinates are filled with spaces.
The formulas combining the USM-GT-400 input variables with the PGC data may
not exceed a maximum of 60 Modbus registers.
AZ-51 Formula Status to AZ-54 Formula Status
For the PGC status could be required for example:
• Value = 1 The PGC measures without error
• Value = 0 The PGC is in alarm
• Value = 0 The PGC is in revision
It is possible that a PGC is not providing its status in this form. Instead, there may
be:
Register 10: It shows the number of pending alarms. When showing 0 the PGC
is free of alarms. It is a 16-bit integer register.
Register 2: It is a bit coded information. In the measuring mode of the PGC the
bit is set to 4. It is a 32-bit integer register.
The following considerations help to formulate the state-formation in coordinate
AZ51:
• The first part of a 16-bit integer registers will be imported. The number of pend-
ing alarms shows the data type of an unsigned integer (unsigned short int). The
prefix is a small u. The register address is 10, therefore, the value u10 should
be requested.
10 Operation
Manual USM GT400 · EN10 · May 2021
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