Honeywell CM4 Technical Handbook page 198

CM4 Four-Point Continuous Monitor
Nvi00Request accepts commands to start or stop monitor and to reset
faults. Refer to Table 1 for a list of implemented requests. Additionally,
nvo00Status conveys if the CM4/CM4-P is in or out of monitor, if a
point is enabled or disabled, and if faults or alarms are active. Refer
to Table 2 for a mapping of LonMark nomenclature to Honeywell
Analytics nomenclature.
Request
Implementation
0 RQ_NORMAL
1 RQ_DISABLED
2 RQ_UPDATE_STATUS retransmit status
3 RQ_SELF_TEST
4 RQ_UPDATE_ALARM
5 RQ_REPORT_MASK notify of implementation notify of implementation
6 RQ_OVERRIDE
7 RQ_ENABLE
8 RQ_RMV_OVERRIDE
9 RQ_CLEAR_STATUS
10 RQ_CLEAR_ALARM clear all alarms, faults clear all alarms, faults
Table G-1: Implemented Requests
Nvo00FaultS reports the existence of any fault. The state byte of this
two-byte structure will contain a FALSE (0) if no fault is active or a
TRUE (1) if a maintenance or instrument fault exists. The value byte
will contain the fault number.
Nvo00FaultID reports the presence of faults in a simpler format for
consumption by true peer nodes. This contains ST_OFF, or 0, if no
fault exists, ST_LOW, or 1, if a maintenance (minor) fault exists, and
ST_MED, or 2, if an instrument (serious) fault exists.
CM4 Technical Manual
Node 0 Nodes 1-4
Implementation
start monitor start monitor
exit monitor
retransmit status
start monitor
Status Field Node 0 interpretation
object_id (16 bits)
invalid_id
invalid_request unimplemented request made unimplemented request made
disabled
out_of_limits
open_circuit
out_of_service
mechanical_fault instrument (serious) fault
feedback_failure
over_range alarm is level 2 any pt
under_range
electrical_fault maintenance (minor) fault
unable_to_measure
comm_failure
fail_self_test
self_test_in_progress
locked_out
manual_control
in_alarm alarm any level, any pt
in_override
report_mask mere capability report
Table G-2: LonMark
Nvo0xAlmL (five variables) report the alarm state of the CM4. The
four variables nvo01AlmL through nvo04AlmL convey the alarm level
of the four points. ST_OFF is transmitted when no alarm exists, ST_
LOW is transmitted when a level 1 alarm is present, and ST_MED is
transmitted when a level 2 alarm is active. The general alarm variable
G-9
Nodes 1-4 interpretation
0
object_id >4
out of monitor disabled by configuration or
instrument (serious) fault
alarm is level 2 this pt
maintenance (minor) fault
host is dead
alarm any level this pt
mere capability report
®
and Honeywell Analytics Nomenclature
1-4
object_id >4
PntLockon
disabled by fault
host is dead