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Configuration and Use Manual 209
Diagnostics and Troubleshooting
Diagnostics and Troubleshooting Specifications – Model 3350/3700Specifications – Model 3300/3500Measurement Performance
Some alarms can be reclassified. For example:
• The default severity level for Alarm A020 (calibration factors unentered) is Fault, but you can
reconfigure it to either Informational or Ignore.
• The default severity level for Alarm A102 (drive over-range) is Informational, but you can
reconfigure it to either Ignore or Fault.
For information on which alarms can be reclassified, see Section 22.7. For information on how to
reclassify alarms, see Section 6.3.1.
22.6.2 Fault timeout
By default, the Series 3000 device immediately sets outputs to their configured fault levels when a
fault is encountered. For specific faults, you can delay this action by changing the fault timeout to a
non-zero value (see Chapter 8
). If fault timeout is configured:
• During the fault timeout period, the device continues to report its last valid measurement.
• The fault timeout applies only to the mA output, frequency output, and discrete output. Fault
indication via digital communications is unaffected.
The fault timeout is not applicable to all faults. See Section 22.7 for information about which faults
are affected.
22.6.3 Alarm categories
Alarms are organized into four alarm categories, in the following order of priority:
• Electronics
• Sensor (Model 3500 and Model 3700 transmitters only)
•Process
• Configuration
22.6.4 Alarm occurrences and logs
Information about alarm occurrences is maintained and displayed in three different ways:
• Active alarm log (see Figure 22-2) – Lists:
- All alarms that are active (the condition that caused the alarm is active)
- All alarms that have not been acknowledged (even if the condition causing the alarm is no
longer active)
Table 22-3 Alarm severity levels and fault reporting
Severity level
Series 3000 device action if condition occurs
“Alarm active”
status bit set?
Alarm shown
on display?
“Alarm active” record
written to history?
Fault indication
activated?
(1)
(1) For some alarms, fault indication (setting outputs to configured fault levels) will not occur until the fault timeout expired. For other
alarms, fault indication begins as soon as the fault condition is recognized. Tables 22-4 through 22-6 include information on which
alarms are affected by the fault timeout. To configure fault timeout, see Chapter 8.
Fault Yes Yes Yes Yes
Informational Yes Yes Yes No
Ignore Yes No No No