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4.6 Concept of I/O Number Assignment
4.6.2 I/O numbers of remote station
4
I/O NUMBER ASSIGNMENT
(2) Precautions for using remote station I/O numbers
(a) Setting in consideration of future extension
When using the input (X) and output (Y) of the CPU module for the I/O numbers of
remote stations, set them in consideration of extension of I/O modules and/or
intelligent function modules on the CPU module side.( Figure 4.20)
(b) When MELSECNET/H and CC-Link are used
Do not assign the same I/O numbers to the refresh target (CPU module side
device) of MELSECNET/H and to the CC-Link remote I/O system.
(c) Number of CPU module I/O device points
The number of I/O device points changes depending on the CPU module.
Refer to Chapter 2 for the number of CPU module I/O device points.
POINT
1. When network parameter setting has not been made in the CC-Link system,
the following points are assigned to the CC-Link master/local modules of
lower numbers.
• Basic model QCPU
X/Y400 to 7FF (1024 points)
• High Performance model QCPU, Process CPU, Redundant CPU,
Universal model QCPU
X/Y1000 to 17FF (2048 points)
2. There is restriction on the order of allocating I/O numbers for MELSECNET/H
remote I/O networks, CC-Link or other networks.
3. Space can be made between the I/O area for the MELSECNET/H remote I/O
station and the I/O area for the CC-Link remote I/O station.
Figure 4.20 Remote station I/O number assignment
X/Y0
X/Y3FF
X/Y400
X/Y4FF
X/Y500
X/Y1FFF
For MELSECNET/H
remote I/O station
Input/output (X/Y)
Held back for future additions
I/O numbers that can be used by remote stations
I/O numbers used by I/O modules/intelligent function
modules
When X/Y0 to 3FF (1024 points) are used by I/O modules/intelligent function
modules and X/Y400 to 4FF (256 points) are secured for future additions
For CC-Link
remote station
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