GE GFK-0787B user manual Voting for One Discrete Input

4

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 Provided
		Input A	0	to Application
Field Input					Logic
Data		Input B	0		0
		Input C	1	GMR Software Performs
				1 out of 1 Voting if Voting
				Adaptation is 3±2±1±0
	Duplex State		0

Default State

1

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

Field Input Data		Input Provided
Input A	0	to Application
			Logic
Input B	0		1
Input C	1	GMR Software uses Default State
		if Voting Adaptation is 3±2±0

Duplex State

0

Default State

1

GFK-0787B Chapter 4 PLC Subsystem 4-11