Data Values Common To Fieldbus Networks - Honeywell Vertex M User Manual

8.7.2 Data Values Common to Fieldbus Networks

All six optional fieldbus networks report alarm, fault and concentration information.
Alarms and Faults
The alarm status of each point is reported as a single byte. The meaning of that byte is as listed
in Table 8-8. Similarly, the fault status of each analyzer is reported as a single byte. The
meaning of the fault byte is listed in Table 8-8.
Alarm/ Fault
value
0
1
2
3
Concentrations
Finally, the concentration information is reported as one 16-bit word for each point as shown in
Table 8-9.
Value
0 Analyzer not present
3120 Instrument Fault exists (only if configured)
6241 to Normalized concentration from zero to the 20 mA full scale value as set in the
31206 point configuration.
Fault status can be superimposed over the concentration information in a manner similar to
legacy 4-20 mA analog outputs. The output will drop below nominal if an instrument fault
exists. However, indication of faults via the concentration output is disabled by default. It can
be turned on in the configuration profile as shown in Figure 8-1. See "Configuration Utility" on
page 51 for more information.
Vertex M
Alarm Interpretation
No Gas
Warning of non-zero concentration below Alarm
Level 1
Alarm Level 1 Exceeded
Alarm Level 2 Exceeded
Table 8-8. Alarm and Fault Interpretations
Table 8-9. Interpretation of Concentration Values
Description
198
Fault Interpretation
No Fault
Maintenance Fault
Present
Instrument Fault
Present
Both Faults Present
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