Filter
Top Products
8
8-7GFK-0787B Chapter 8 Installation Information
Input Wiring (continued)
Block Wiring for 16-Circuit Sink Block in an Input Group
S1
S2
SHLD IN
SHLD OUT
DC+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DC–
Genius Bus
Connections
22V to 56V DC
Typical for each of up to 15 inputs
DC Sink Block IC660BBD021
O VDC
Ground
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).
Connection if no points on the
block are to be autotested
(must disconnect output 16).
Tristate input requires par-
allel zener diode, voltage
rating 6.2V
* Zener should be wired at
the input device.
* Use of such “super-
vised” inputs is optional.
*
If single sensor, it must also be
wired to corresponding point on
two other input blocks
Required at each input (for Input
Autotesting). 1N5400 or equivalent.
In three-block input group, each block is connected to one bus of three.
If an input is wired for tristate operation, the circuit LED glows dimly when the
input off.
If redundant power supplies are to be used, they should be diode “ORed” power
supplies providing common power to all blocks in a group. Different groups may
use different power sources.