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I/O Area and I/O Allocations Section 4-2
4-2-2 Allocations to Built-in General Purpose I/O on the CPU Unit
The bits that are allocated depend on the model of CPU Unit, as shown in the
following figures.
Allocations for X and XA CPU Units (24 Inputs/16 Outputs)
Bits are allocated for X and XA CPU Units as shown in the following figure.
Input Bit Allocations
For X and XA CPU Units, a total of 24 input bits are allocated: 12 bits in CIO 0
from bit 00 to bit 11 and 12 bits in CIO 1 from bit 00 to bit 11. Bits 12 to 15 in
CIO 0 and CIO 1 are always cleared and cannot be used as work bits.
Output Bit Allocations
For X and XA CPU Units, a total of 16 output bits are allocated: eight bits in
CIO 100 from bit 00 to bit 07 and eight bits in CIO 101 from bit 00 to bit 07.
Bits 08 to 15 in CIO 100 and CIO 101 can be used as work bits.
Inputs
Outputs
CIO 0.00 to CIO 0.11
CIO 1.00 to CIO 1.11
CIO 100.00 to CIO 100.07
CIO 101.00 to CIO 101.07
24 inputs
16 outputs
CPU Unit
CIO 2.00 on
CIO 102.00 on
Expansion I/O Unit
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
CIO 0
CIO 1
CIO 2
CIO 3
CIO 4
CIO 5
CIO 16
24 input bits allocated to X or XA CPU Unit
Input bits allocated to CP-series Expansion I/O Unit
Allocated to 40-point (24-input) Expansion I/O Unit
or 20-point (12-input) Expansion I/O Unit
Allocated to 8-input Expansion I/O Unit
Do not use.
Do not use.
to
Can be used as output bits for
CPU Unit or Expansion I/O Unit.
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
CIO 100
CIO 101
CIO 102
CIO 103
CIO 104
CIO 105
CIO 116
16 input bits allocated
to X or XA CPU Unit
Output bits allocated to
CP-series Expansion I/O Units
Can be used as work bits.
Can be used as work bits.
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