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4-15GFK-0787B Chapter 4 PLC Subsystem
Voting for Two Analog 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.
Three vote options in duplex mode are determined by the duplex state: highest, lowest,
or average.
If lowest has been configured, the GMR software selects the intermediate value with
the unused (third) channel being assigned its minimum configured value.
Field Input Data
Input 1
Input 2
Input 3
152
150
175
150
Single Input Provided
to Application Logic
Field Input
Data
Duplex State
(low, high, or average value)
Default State (hold last,
minimum, or maximum)
lowest
max.
100
175
minimum value
maximum value
If highest has been configured, the GMR software selects the intermediate value, with
the unused (third) channel being assigned its maximum configured value.
Field Input Data
Input 1
Input 2
Input 3
152
150
175
152
Single Input Provided
to Application Logic
Field Input
Data
Duplex State
(low, high, or average value)
Default State (hold last,
minimum, or maximum)
highest
max.
100
175
minimum value
maximum value
If average has been configured, the GMR software averages the two remaining
input values and supplies the result to the PLC Input Table.
Field Input Data
Input 1
Input 2
Input 3
152
150
175
151
Single Input Provided
to Application Logic
Field Input
Data
Duplex State
(low, high, or average value)
Default State (hold last,
minimum, or maximum)
average
max.
125
175
minimum value
maximum value