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MELSEC-Q
15 ALLOCATING MULTIPLE PLC SYSTEM I/O NUMBERS
15.1.2 I/O number of High Performance model QCPU, Motion CPU and PC CPU module
I/O numbers are allocated to the CPU modules with the multiple PLC system in order
to allow interactive communications between the CPU modules with the following
commands.
• Multiple PLC commands
• Motion dedicated commands
• Dedicated communication commands between multiple PLCs
The I/O numbers for the CPU modules are fixed for the slots on which they are
mounted and cannot be amended.
The table below shows the I/O number allocated to each CPU module when the
multiple CPU system is composed.
CPU module
mounting position
CPU slot Slot 0 Slot 1 Slot 2
First I/O number 3E00
H
3E10
H
3E20
H
3E30
H
The CPU modules I/O numbers are used in the following cases.
• When writing data in the host PLC's CPU shared memory with the S.TO instruction.
1
• When reading data from other PLC's CPU shared memory with the FROM
instruction.
1
• When reading data from other PLC's CPU shared memory with the intelligent
function module device (U_\G_).
1
• When specifying the High Performance model QCPU to be accessed with the
Ethernet module.
1
• When specifying the High Performance model QCPU to be accessed with the serial
communication module.
3
REMARK
1: See Chapter 16 for details on among High Performance model QCPU, Motion
CPU and PC CPU module.
2: Refer to the Ethernet module's manual for details on accessing the High
Performance model QCPU with the Ethernet module.
3: Refer to the serial communication module's manual for details on accessing the
High Performance model QCPU with the serial communication module.
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