GE GFK-0787B user manual Genius I/O Blocks, Discrete Blocks, Analog, RTD, and Thermocouple Blocks

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Genius I/O Blocks

Inputs and outputs in a GMR system are provided by Genius I/O blocks. Some types of Genius blocks are now enhanced for GMR operation. In addition, these and other types of blocks can be included in a GMR system as ªnon-votedº blocks. Non-voted blocks are individual blocks that are present on GMR busses in the system; they are not part of any GMR input group or output group. They are included in the GMR configuration and they may be autotested.

Discrete Blocks

All types of discrete blocks can be used as non-voted blocks in a GMR system.

The discrete blocks listed on page 1-2 are standard Genius blocks that are now enhanced to include GMR functions. These blocks can be used in either GMR or

non-GMR systems. When configured for GMR operation (only), they perform output voting, support GMR autotesting, and provide diagnostic reports to up to three PLCs. In addition, certain of their operating parameters are changed when they are in GMR mode.

Analog, RTD, and Thermocouple Blocks

Analog blocks can be included in the GMR configuration and used in GMR input groups, as either voted or non-voted inputs. However, analog blocks in GMR input groups are not autotested by the GMR software.

Analog blocks do not provide output voting, so they cannot be used in GMR output block groups. However, they can be used as non-voted blocks in a GMR system, and support standard Hot Standby Redundancy.

Analog, RTD, and Thermocouple blocks operate the same way in either GMR or non-GMR systems. No specific versions of these blocks are required for GMR use.

I/O Block Summary

The following table summarizes how different types of blocks can be used in a GMR system.

Basic Block Types

24/48VDC16-CircuitSourceblock 24/48VDC16-Circuit Sink block 12/24VDC32-CircuitSourceblock 5/12/24VDC32-Circuit Sink block

Can be GMR	Can be GMR	Canbe	Canbe
InputBlock	Output Block	ªnon-votedº	Autotested
		GMRblock
yes	yes	yes	yes

Canbe non-GMR block

yes

	Any other discrete block	no	no	yes	no	yes
	Analog,RTD, and Thermocouple	yes	no	yes	no	yes
	blocks
	High-speedCounterblock	no	no	no	no	yes
	Power Tracblock	no	no	no	no	yes
1-8	GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System					GFK-0787B
	User's Manual ± March 1995