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5-6 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual –March 1995
GFK-0787B
Single Input Sensor to Triplex Block Group
Field
Switch
Zener
Diode
Power feed outputs require isolation diode when single input device is
wired to more than one block.
Operation of the Input Autotest
The following actions are performed during the Input Autotest:
the power feed outputs * are pulsed Off. Selected input channels are pulsed On.
all associated inputs are checked for their ability to detect the On or Off state, as
appropriate, and a fault is reported if the correct state is not detected..
While it is being tested, a block continues to supply its last valid set of inputs instead of the
physical inputs to the PLCs.
Test Verification
By allowing some inputs to be turned On, the Input Autotest checks its own operation.
The following table shows cycles in which blocks are autotested, and circuits that are
turned On in the same cycle
Block
Type
1st A/T
Cycle
2nd A/T
Cycle
3rd A/T
Cycle
4th A/T
Cycle
Circuits Turned
On at the Same
Time
Circuit Fail
Mask
16 Cir-
cuit DC
Block A
Block B
Block C
Block C
Block A
Block B
Block B
Block C
Block A
Block A
Block B
Block C
1,3,5,7,10,12,14
2,4,6,8
9,11,13,15
2A55
00AA
5500
32 Cir-
cuit DC
Block A
Block B
Block C
Block A
Block B
Block C
Block C
Block A
Block B
Block B
Block C
Block A
1,5,9,13,17,21,25,29
2,6,10,14,18,22,26,30
3,7,11,15,19,23,27,31
4,8,12,20,24,28,32
1111 1111
2222 2222
4444 4444
8888 0888
Notes: Bit 16 corresponds to the power feed output. It is always 0.
For 16-Circuit blocks, each circuit is turned On each cycle when looked at across all
3 blocks, but the same circuit is never turned On at more than one block at a time.
For 32 Circuit blocks, almost all circuits are turned On each cycle when looked at
across all 3 blocks, but the same circuit is never turned On at more than one block
at a time.
* also see chapter 8 for installation and wiring information.