Emerson 8700 Series, Reference Manual

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Reference Manual
00809-0100-4793, Rev CA
August 2004
Rosemount 8742C
C-6
Alarm Detection
A block alarm will be generated whenever the BLOCK_ERR has an error bit
set. The types of block error for the resource block are defined in Table C-2.
A write alarm is generated whenever the WRITE_LOCK parameter is cleared.
The priority of the write alarm is set in the following parameter:
• WRITE_PRI
Alarms are grouped into five levels of priority, as shown in Table C-3.
Table C-3. Alarm Priorities
Status Handling
There are no status parameters associated with the resource block.
VCR
The number of configurable virtual communication relationships or VCRs is
18. The parameter is not contained or viewable within the resource block, but
it does apply to all blocks.
TROUBLESHOOTING
Refer to Table C-4 to troubleshoot resource block problems.
Table C-4. Troubleshooting
Priority
Number Priority Description
0 The priority of an alarm condition changes to 0 after the condition that
caused the alarm is corrected.
1 An alarm condition with a priority of 1 is recognized by the system, but is
not reported to the operator.
2 An alarm condition with a priority of 2 is reported to the operator, but
does not require operator attention (such as diagnostics and system
alerts).
3–7 Alarm conditions of priority 3–7 are advisory alarms of increasing
priority.
8–15 Alarm conditions of priority 8–15 are critical alarms of increasing priority.
Symptom Possible Causes Corrective Action
Mode will not
leave OOS. Target mode not set Set target mode to something other
than OOS.
Memory failure BLOCK_ERR will show the lost NV
Data or Lost Static Data bit set.
Restart the device by setting
RESTART to Processor. If the block
error does not clear, call the factory.
Block alarms will
not work. Features FEATURES_SEL does not have
Alerts enabled. Enable the Alerts bit.
Notification LIM_NOTIFY is not high enough. Set
equal to MAX_NOTIFY.
Status options STATUS_OPTS has Propagate Fault
Forward bit set. This should be
cleared to cause an alarm to occur.