GE GFK-0787B Block Wiring for 16-Circuit Sink Block in an Input Group, DC Sink Block IC660BBD021

8

Input Wiring (continued)

Block Wiring for 16-Circuit Sink Block in an Input Group

DC Sink Block IC660BBD021

If single sensor, it must also be wired to corresponding point on two other input blocks

22V to 56V DC

Genius Bus

Connections

S1

S2 SHLD IN SHLD OUT

DC+

1

*

Tristate input requires par- allel zener diode, voltage rating 6.2V

*Zener should be wired at the input device.

*Use of such ªsuper- visedº inputs is optional.

Typical for each of up to 15 inputs

Required at each input (for Input

Autotesting). 1N5400 or equivalent.

If group inputs are configured for

autotesting, circuit 16 must be used as an output

If no autotesting is to be done on this group of inputs, the input devices must not be wired to cir- cuit 16. They must be wired to the power source instead.

If group uses single sensors, point 16 must also be wired to corresponding point on two other input block.

Diode required at each power feed output (for input autotesting) 1N5400 or equivalent).

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

DC±

Connection if no points on the block are to be autotested (must disconnect output 16).

OVDC

Ground

H In three-block input group, each block is connected to one bus of three.

H If an input is wired for tristate operation, the circuit LED glows dimly when the input off.

H If redundant power supplies are to be used, they should be diode ªORedº power supplies providing common power to all blocks in a group. Different groups may

	use different power sources.
GFK-0787B	Chapter 8 Installation Information	8-7