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I/O Rack Number
4-22
Classic PLC-5
processors only
I/O Rack Number (PLC-5 Processor as an Adapter in a PLC-3 System
or a PLC-5/250 System – 4-word groups)
Rack
4
5
6
7
8
Rack
4
5
6
7
8
0
on
on
on
on
on
20
off
on
on
on
on
1
on
on
on
on
off
21
off
on
on
on
off
2
on
on
on
off
on
22
off
on
on
off
on
3
on
on
on
off
off
23
off
on
on
off
off
4
on
on
off
on
on
24
off
on
off
on
on
5
on
on
off
on
off
25
off
on
off
on
off
6
on
on
off
off
on
26
off
on
off
off
on
7
on
on
off
off
off
27
off
on
off
off
off
10
on
off
on
on
on
30
off
off
on
on
on
11
on
off
on
on
off
31
off
off
on
on
off
12
on
off
on
off
on
32
off
off
on
off
on
13
on
off
on
off
off
33
off
off
on
off
off
14
on
off
off
on
on
34
off
off
off
on
on
15
on
off
off
on
off
35
off
off
off
on
off
16
on
off
off
off
on
36
off
off
off
off
on
17
on
off
off
off
off
37
off
off
off
off
off
on = closed
off = open