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5-4 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual –March 1995
GFK-0787B
GMR Autotesting
The GMR software automatically performs autotesting on discrete inputs and outputs that
have been configured to be autotested. Analog inputs and outputs are not autotested by the
GMR software. GMR autotesting can be used in a system with one, two, or three PLCs.
Autotest Sequence
GMR autotesting goes on at the configured interval (0 to 65535 minutes) during system
operation. Each PLC in turn controls the sequence.
PLC A
1. Autotest GMR inputs
2. Complete GMR
output autotest
3. Pass autotest control
to next PLC (here, B).
PLC B
1. Autotest GMR inputs
2. Complete GMR
output autotest
3. Pass autotest control
to next PLC (here, C).
PLC C
1. Autotest GMR inputs
2. Complete GMR
output autotest
3. Pass autotest control
to next PLC (here, A).
If one or two of the PLCs are not available, autotesting continues with the remaining PLC(s).
During its turn as the autotest master, a PLC tests all input and output groups that are set up
for autotesting. These may include the following types of groups:
Input groups: non-voted (1 block)
simplex (1 block)
duplex (2 blocks)
triplex (3 blocks)
Output group: 4-block redundant