Honeywell Vertex M - Data Values Common to Fieldbus Networks

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
Alarm Interpretation Fault Interpretation
0 No Gas No Fault
1
Warning of non-zero concentration below Alarm
Level 1
Maintenance Fault
Present
2 Alarm Level 1 Exceeded
Instrument Fault
Present
3 Alarm Level 2 Exceeded Both Faults Present
Table 8-8. Alarm and Fault Interpretations
Concentrations
Finally, the concentration information is reported as one 16-bit word for each point as shown in
Table 8-9.
Value Description
0 Analyzer not present
3120 Instrument Fault exists (only if configured)
6241 to
31206
Normalized concentration from zero to the 20 mA full scale value as set in the
point configuration.
Table 8-9. Interpretation of Concentration Values
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 198 User Manual