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:
Measurements and data for each transducer
Each input within the block for transducer 1 is assigned as follows:
Alarm 1 is active or latched.
Alarm 2 is active or latched.
If any transducer fault exists.
If any maintenance required status
exists.
If any service in progress status exists.
Transducer
maintenance fault
Internal transducer fault.
Internal transducer fault.
Internal transducer fault.
Transducer heating has failed.
Transducer sample heating has failed.
Transducer needs calibrating.
05410001A / Revision 6 109
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