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I/O Allocation
Section 4-2
4-2
I/O Allocation
IR bits are allocated to actual input terminals and output terminals on the CPU
Board and Expansion I/O Boards. IR words that are not allocated to inputs or
outputs can be used as work words.
CPU Board I/O Allocation
CPU Board inputs are allocated input bits in IR words IR 000 to IR 001 and
CPU Board outputs are allocated output bits in IR words IR 010 to IR 011. The
bit allocations are shown in detail in the following diagrams.
32-point CPU Boards
Note
1.
The unused bits in IR 000 and IR 001 cannot be used as work bits.
2.
IR 00108 to IR 00111 are used as an input DIP switch.
40-point CPU Boards
16 inputs
IR 00000 to IR 00007
IR 00100 to IR 00107
16 outputs
IR 01000 to IR 01007
IR 01100 to IR 01107
Inputs
IR 000
IR 001
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Outputs
IR 010
IR 011
Do not use
Bits
24 inputs
IR 00000 to IR 00007
IR 00100 to IR 00115
16 outputs
IR 01000 to IR 01007
IR 01100 to IR 01107
Inputs
IR 000
IR 001
15
14
13
12
11
10
09
08
07
06
05
04
03
02
01
00
Outputs
IR 010
IR 011
Bits
Do not use
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