MultiExact Gas Analyser
Appendix
A3.11 Transducer fault and alarm mapping
Read-only access to transducer fault and alarm information will be provided in a block
of 100 registers and coils. These can be accessed as discrete inputs using function
code 02 or as input registers using function code 04. Reading them as discrete inputs
provides a simple bit result for each, 0 for off and 1 for on. Reading them as input
registers provides information on their NAMUR status, as follows:
•
0 = off,
•
1 = fault,
•
2 = maintenance required,
•
3 = service in progress.
Alarm 1 and alarm 2 aren't faults and can only be off or on.
The fault, maintenance required, and service in progress faults provide a summary of
the other states and can only be off or on.
The registers are assigned as follows:
Register
Name
Comments
1101 – 1200
Transducer 1
Measurements and data for each transducer
1201 – 1300
Transducer 2
Each input within the block for transducer 1 is assigned as follows:
Register
Name
Comments
1101
Alarm 1
Alarm 1 is active or latched.
1102
Alarm 2
Alarm 2 is active or latched.
1103
Fault
If any transducer fault exists.
1104
Maintenance required
If any maintenance required status
exists.
1105
Service in progress
If any service in progress status exists.
1106
Transducer
maintenance fault
Internal transducer fault.
1107
Transducer error
Internal transducer fault.
1108
Transducer fatal fault
Internal transducer fault.
1109
Heater fault
Transducer heating has failed.
1110
Sample heater fault
Transducer sample heating has failed.
1111
Calibration fault
Transducer needs calibrating.
05410001A / Revision 6
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