4. I/O Area Allocation
This section explains the difference of I/O area allocation in CQM1H, CJ1M/CJ1G Series, and CJ2M series.
♦Unit Area Allocation for CQM1H
The I/O words are allocated to I/O Units and Dedicated I/O Units in the order of the unit mounting position
from the left to right.
The input relays uses the area starting with IR000 (16 inputs on the CPU Unit always use IR000; other Input
Units uses area starting with IR001). The output relays uses area starting with IR100.
Unit Input relay Output relay
16 inputs built into CPU Unit Always allocated to IR 000. -
Input Units or Dedicated I/O
Units which uses input relay
area
Allocated to the area starting
with IR001. Allocation in the
order of unit mounting position.
-
Output Units or Dedicated I/O
Units which uses output relay
area
- Allocated to the area starting
with IR100. Allocation in the
order of unit mounting position.
♦Unit Area Allocation for CJ1M/CJ1G
There are three unit types. The unit area allocation method is different in each group.
(The unit area allocation is the same as that of CJ2M, though the number of units that can be mounted to
the CPU Unit is different.)
Unit Allocation
Basic I/O Units 0000 to 0079CH
Allocated in the unit of 16
inputs/outputs based on the
actually connected unit
position.
Special I/O Units 2000 to 2959CH
Uses 10 words for each unit.
Allocated according to the Unit
No.
CPU Bus Units 1500 to 1899CH
Uses 25 words for each unit.
Allocated according to the Unit
No.
12
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