8

Input Wiring (continued)

Three Sensors to Three Blocks (Triple Bus)

PLC A

PLC B

PLC C

P C G G G S P B B B U C C C

A B C

P C G G G S P B B B U C C C

A B C

P C G G G S P B B B U C C C

A B C

6.2V Zener Diodes for Line Monitoring (optional)

DC+

I1

I15/32

O16

DC+

I1

I15/32

O16

DC+

Input 1

Input 15 or 32

Input 1

Input 15 or 32

Input 1

I1

Input 15 or 32

I15/32

O16

H 6.2 volt Zener diodes are used for optional line monitoring on circuits configured as tristate inputs. This option is only available with 16-circuit DC blocks.

H All blocks in an input group must have the same number of circuits (either 16 or 32).

H On either 16-circuit or 32-circuit blocks, circuit 16 is used as an output if the block group is configured for input autotesting.

H On any block, circuits that are not configured as part of the GMR input group can be used as non-redundant inputs or outputs.

H All blocks in the input group must be assigned the same serial bus address.

H If the block group is configured for input autotesting, it must be wired appropriately. Each input that is configured (by the GMR Configuration Software) to be autotested must have its input device wired to receive power from output Q16 of the block group, as shown above.

H Isolation diodes must also be wired as shown above for any input to be autotested.

 

The suggested diode is 1N5400 or equivalent.

 

GFK-0787B

Chapter 8 Installation Information

8-5

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GE GFK-0787B user manual Three Sensors to Three Blocks Triple Bus