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5-26 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual –March 1995
GFK-0787B
Discrete Output Fault Contacts for GMR
For discrete outputs, the fault contact is associated with the logical outputs (outputs from the
application program).
Logical
reference
Physical
reference
Fault
contact
Contact References Associated with an Output
These logical references are copied to the physical output references. If a fault is detected on a
physical output, the fault contact associated with that output’s logical reference is set.
Conditions that Cause Discrete Output Fault Contacts to be Set
The following illustration summarizes the conditions that cause discrete output fault contacts
to be set for logical, physical, and non-redundant outputs.
Discrete Output Table
Logical Outputs
Available for
Non-redundant Outputs
Physical Outputs
Reserved memory
Any fault
Genius fault
Discrepancy fault
Genius fault
Autotest fault
Discrepancy fault
•
•
•
•
•
•
Genius fault
Discrepancy fault
•
•
Conditions that Cause these
Fault Contacts to be Set
(see the text below)
For redundant outputs, the fault contact is set and fault messages logged for:
Autotest fault
Genius faults including Loss of Block, and the following additional faults:
Failed switch: Occurs if the actual output state differs from the commanded
state.
No-load fault: 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 100mA (not 50mA, as
it would be for a block not used in a GMR group).
For a 4-block group, a system output no-load fault is produced if outputs are
ON; blocks A and B or blocks C and D report no-load faults.