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4-10 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Voting with Two Discrete Inputs
Two inputs may be present in either a Duplex input group, or in a Triplex input group
where one of the three inputs has failed.
For its 2 out of 3 voting, the GMR software uses the group’s configured Duplex State in
place of a third actual input.
Field Input Data
Input A
Input B
Input C
0
1
1
1
Single Input Provided
to Application Logic
Field Input
Data
Duplex State
1
Default State
0
GMR Software Performs
2 out of 3 Voting
Discrete Input Voting with Two Inputs Present and Duplex State Set to 1
If the Duplex State is set to 1 and two inputs are available, both of the “actual” inputs
must be 0 for the voted input state to be 0. The voted input is 1 if either of the actual
inputs is 1.
Input A State Input B State Input C
(Duplex State)
Voted Input State
0 0 1 0
0 0 1 0
0 1 1 1
0 1 1 1
1 0 1 1
1 0 1 1
1 1 1 1
1 1 1 1
Discrete Input Voting with Two Inputs Present and Duplex State Set to 0
If the Duplex Default state is set to 0 and two inputs are available, both of the “actual”
inputs must be 1 for the voted input to be 1. The voted input is 0 if either of the
remaining inputs is 0.
Input A State Input B State Input C
(Duplex State)
Voted Input State
0 0 0 0
0 0 0 0
0 1 0 0
0 1 0 0
1 0 0 0
1 0 0 0
1 1 0 1
1 1 0 1