5

Shortcircuit fault

Overtemperaturefault

Overloadfault

hDiscrepancy

The blocks each report the discrepancy status for the data from each PLC, together with the PLC online/offline status.

All PLCs periodically monitor all blocks' discrepancy status. Three discrepancy bits are maintained for each output; one for each of the PLCs. One of the bits is set if a block reports a discrepancy for any of its outputs.

HFor non-redundant outputs, the single fault contact is associated with the physical output. The fault contact is set under the following conditions:

h Discrepancyfault

hGeniusfaults including Loss of Block, and the following additional faults:

Failedswitch: Occurs if the actual output state differs from the commanded state.

No Loadfault: For 16-circuit blocks only, individual outputs can be configured to enable or disable reporting No-load faults. The minimum load current required to assure proper no-load reporting is 50mA (not 100mA, as it would be for a block in a GMR group).

For a single block, no-load fault reports for block outputs that are ON may be generated at any time except during a Pulse Test. For block outputs that are OFF, no-load fault reports are generated during a Pulse Test.

ShortCircuitfault.

Overtemperaturefault

Overloadfault

GFK-0787B

Chapter 5 Diagnostics

5-27

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GE GFK-0787B user manual ShortCircuitfault Overtemperaturefault Overloadfault