Vertex M
TM
24-Point Continuous Monitor
Appendix A - Network Interface and Options
F-9
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
Table A-4
.
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
Alarm/
Fault
value
LonWorks
SNVT_lev_
disc
value
Alarm
Interpretation
Fault
Interpretation
0
ST_OFF
No Gas
No Fault
1
ST_LOW
Warning of
non-zero
concentration
below Alarm
Level 1
Maintenance
Fault Present
2
ST_MED
Alarm Level 1
Exceeded
Instrument
Fault Present
3
ST_HIGH
Alarm Level 2
Exceeded
Both Faults
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
.
Table A-5. Interpretation of Concentration Values
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.
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
A-1
. For details see
Section 3.6 Configuration Utility
.
Figure A-1.
Configuration Profile
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