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Fault Reference Name Examples:
#RACK_0001 represents rack 1.
#SLOT_0105 represents rack 1, slot 5.
#BUS_02041 represents rack 2, slot 4, bus 1.
#M_2061028 represents rack 2, slot 6, bus 1, Genius module 28.
Note: When a slot level failure fault is reported to the fault tables, all bus and module fault locating
references associated with that slot are set (the FAULT contact passes power flow, and the
NOFLT contact does not pass power flow), regardless of what type of module it is.
Conversely, when a slot level reset fault is reported to the fault tables, all bus and module
fault locating references are cleared (the FAULT contact does not pass power flow, and the
NOFLT contact passes power flow).
Behavior of Fault Locating References
At power-up, all fault locating references are cleared in the CPU. When a fault is logged, the CPU
transitions the state of the affected reference(s). The state of the fault reference remains in the fault
state until one of the following actions occurs:
▪
Both the Controller and the I/O Fault Tables are cleared through your programming software
either by clearing each table individually or clearing the entire CPU memory.
▪
The associated device (rack, I/O module, or Genius device) is added back into the system.
Whenever an Addition of. . . fault is logged, the CPU initializes all fault references associated with
the device to the NoFlt state. These references remain in the NoFlt state until another fault
associated with the device is reported. (This could take several seconds for distributed I/O faults,
especially if the bus controller has been reset.)
Note: These fault references are set for informational purposes only. They should not be used to
qualify I/O data. The Alarm Contacts (described in Using Alarm Contacts) may be used to
qualify I/O data. The CPU does not halt execution as a result of setting a fault locating
reference to the Fault state.
The fault references have a cascading effect. If there is a problem in the module located at rack 5,
slot 6, bus 1, module 29, the following fault references are set: RACK_05, SLOT_0506, BUS_05061,
and M_5061029. There will only be one entry in the fault table to describe the problem with the
module. The fault table does not show separate entries pertaining to the rack, slot, and bus in this
case.
If an analog base module (IC697ALG230) is lost, the fault locating reference for that module is set.
The fault locating references for its expander modules (IC697ALG440 and ALG441) are not set as a
result of the loss. Therefore, any fault locating references to an expander module should also
reference the base module to verify that the module or its base have not been lost.
GFK-2950C
February 2018
Chapter 9. Diagnostics
395
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