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2.2.2 I/O numbers of CPU modules
In multiple CPU systems, I/O numbers are assigned to each CPU module to specify mounted CPU modules. The I/O
number for each CPU module is fixed at the corresponding slot, and cannot be changed in PLC parameter ("I/O
Assignment").
The following is the list of I/O numbers that can be assigned to CPU modules.
Available slots differ depending on the QCPU used as CPU No.1 and the main base unit used. ( Page 31,
CHAPTER 3)
(1) Uses of I/O numbers of CPU modules
The I/O numbers of CPU modules are used for the following purposes.
• Communications among CPU modules ( Page 116, CHAPTER 6)
• Specifying the communication-target CPU module under the MC protocol ( MELSEC-Q/L MELSEC
Communication Protocol Reference Manual)
Item
CPU module mounting position
CPU slot Slot 0 Slot 1 Slot 2
Start I/O number
3E00
H
3E10
H
3E20
H
3E30
H