Data Values Common To Fieldbus Networks; Alarms And Faults; Concentrations - Honeywell Vertex M Technical Handbook

Vertex M 24-Point Continuous Monitor
TM
A.3 Data Values Common to Fieldbus
Networks
All six optional fieldbus networks report alarm, fault
and concentration information.
A.3.1 Alarms and Faults
The alarm status of each point is reported as a single
byte. The meaning of that byte is as listed in
Similarly, the fault status of each analyzer is reported
as a single byte. The meaning of the fault byte is listed
in Table A-4.
Table A-4. Alarm and Fault Interpretations
LonWorks
Alarm/ SNVT_lev_
Fault disc
value value
0 ST_OFF
1 ST_LOW
2 ST_MED
3 ST_HIGH
Appendix A - Network Interface and Options
Alarm Fault
Interpretation Interpretation
No Gas No Fault
Warning of Maintenance
non-zero Fault Present
concentration
below Alarm
Level 1
Alarm Level 1 Instrument
Exceeded Fault Present
Alarm Level 2 Both Faults
Exceeded Present
A.3.2 Concentrations
Finally, the concentration information is reported as
one 16-bit word for each point as shown in
Table A-5. Interpretation of Concentration Values
Value
0
Table A-4.
3120
6241 to 31206 Normalized concentration
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
A-1. For details see
F-9
Description
Analyzer not present
Instrument Fault exists
(only if configured)
from zero to the 20 mA full
scale value as set in the point
configuration.
Section 3.6 Configuration
Figure A-1. Configuration Profile
Table A-5.
Figure
Utility.