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2-5 I/O Units
I/O Units are divided into three groups based on the way that I/O words they use
are allocated. Standard I/O Units are allocated I/O words according to the Unit’s
location on the CPU or Expansion I/O Rack. Group-2 High-density I/O Units are
allocated I/O words according to I/O number set on each Unit. High-density I/O
Units classified as Special I/O Unit are allocated I/O words according to the unit
number set on each Unit.
2-5-1 Standard I/O Units
Standard I/O Units come in three shapes; A-shape, B-shape, and E-shape. Re-
fer to Appendix B Specifications for the dimensions of each Unit.
A-shape I/O Unit
I/O Unit lock notch
Nameplate
I/O indicators:
Indicate ON/OFF
status of points
10-terminal terminal block
I/O Units Section 2-5
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