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8
8-6 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual – March 1995
GFK-0787B
Input Wiring (continued)
Block Wiring for 16-Circuit Source 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
If single sensor, it must also be
wired to corresponding point on
two other input blocks
Typical for each of up to 15 inputs
DC Source Block IC660BBD020
O VDC
Ground
Point 16 must also be wired to
corresponding point on two
other input blocks if simplex
sensors are used
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 circuit 16. They must be wired to
the power source instead.
Diode required at each powerfeed 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
series zener diode, voltage
rating 6.2V
* Zener should be wired at
the input device.
* Use of such “super-
vised” inputs is optional.
*
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.