GE GFK-0787B Manuel D’Utilisation

tModular Redundancy Flexible Triple Modular Redundant (TMR) System

The input subsystem can also include three types of non-voted inputs:

H Inputs from single-block (simplex) GMR input groups

Individual blocks can be included in the GMR configuration as “simplex groups”,
and can utilize the GMR features such as autotesting. Inputs from simplex blocks are
placed into the area of the Input Table used for GMR inputs.

H Inputs from non-GMR I/O blocks

“Non-voted” blocks are individual blocks that are present on a GMR bus and are
included in the GMR configuration.  However, their inputs are not voted on by the
PLC(s), and are located in a different area of the Input Table.

H Non-voted points on individual blocks in a multiple-block GMR input group

Non-voted I/O points may be placed within a voted input group, to take advantage
of unused circuits. These extra circuits can be used as either inputs or outputs.  If the
group utilizes GMR autotesting of inputs, circuit 16 on each block, which is required
for autotest, cannot be used for non-GMR I/O.

: a discrete input group consisting of three 16-circuit blocks has only four

voted inputs. That leaves circuits 5 through 15 on each block for use as non-GMR
inputs or outputs. Circuit 16 is used for the autotest feature.

1st GMR input

2nd GMR input

3rd GMR input

4th GMR input

GMR Autotest

Can be used as

non-GMR inputs

and outputs

Individual input points used in this way can be autotested if autotesting is set up as
part of their GMR configuration.