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4-11GFK-0787B Chapter 4 PLC Subsystem
Voting for One Discrete Input
One input may be present in a non-voted input group, in a Simplex input group, in a
Duplex input group where one input has failed, or in a Triplex input group where two
inputs have failed.
In a non-voted input group, the actual input is always provided to the application logic.
In a voted input group, if only one input is available the result of the voting depends on
the Voting Adaptation mode that has been configured for the input group.
Discrete Input Voting with One Input Present and Voting Adaptation Set to 3–2–1–0
For a Simplex Input group (one input) the voted input is the same as the actual input.
This is also true if there is just one actual input present on a Duplex or Triplex group
configured for 3–2–1–0 Voting Adaptation.
Field Input Data
Input A
Input B
Input C
0
0
1
GMR Software Performs
1 out of 1 Voting if Voting
Adaptation is 3–2–1–0
0
Input Provided
to Application
Logic
Duplex State
0
Default State
1
Field Input
Data
Discrete Input Voting with One Input Present and Voting Adaptation Set to 3–2–0
Configuring a Duplex or Triplex input group for 3–2–0 Voting Adaptation prevents the
data from just one input being used as the only input data for that group. If a Duplex or
Triplex group configured for 3–2–0 Voting Adaptation has just one input present, the
configured input Default State is used instead of the remaining actual input.
Field Input Data
Input A
Input B
Input C
0
0
1
GMR Software uses Default State
if Voting Adaptation is 3–2–0
1
Input Provided
to Application
Logic
Duplex State
0
Default State
1
Field Input
Data