GE GFK-0787B user manual Non-Voted I/O in the Input Subsystem, Inputs from non-GMR I/O blocks

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Non-Voted I/O in the Input Subsystem

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

HInputs from single-block (simplex) GMR input groups

Individual blocks can be included in the GMR configuration as ªsimplex groupsº, 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.

HInputs from non-GMR I/O blocks

ªNon-votedº 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.

HNon-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-GMRI/O.

Example: 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.

Block A

1st GMR input 2nd GMR input 3rd GMR input 4th GMR input

Can be used as non-GMR inputs

and outputs

GMR Autotest

Blocks B and C are the same

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

2-4	GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System	GFK-0787B
	User's Manual ± March 1995