GE GFK-0787B user manual Block Wiring for 16-Circuit Source Block in an Input Group

8

Input Wiring (continued)

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

DC Source Block IC660BBD020

	If single sensor, it must also be
Connection if no points on the	wired to corresponding point on
	two other input blocks
block are to be autotested
(must disconnect output 16).
	22V to 56V DC	S1
		S2
	Genius Bus
	Connections	SHLD IN
		SHLD OUT
		DC+
		1
*		2
Tristate input requires		3
series zener diode, voltage
rating 6.2V	Required at each input (for Input	4
* Zener should be wired at
	Autotesting). 1N5400 or	5
the input device.	equivalent.	6
* Use of such ªsuper-		7
visedº inputs is optional.	If group inputs are configured for	8
	autotesting, circuit 16 must be used as an	9
	output
		10
	If no autotesting is to be done on this group
		11
	of inputs, the input devices must not be
	wired to circuit 16. They must be wired to	12
Typical for each of up to 15 inputs	the power source instead.
		13
	Diode required at each powerfeed output
	(for Input Autotesting) 1N5400 or equivalent.	14
		15
		16
		DC±
Point 16 must also be wired to
corresponding point on two	OVDC
other input blocks if simplex
sensors are used
		Ground

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

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

HIf 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.

8-6	GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System	GFK-0787B
	User's Manual ± March 1995