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CHAPTER4 ASSIGNMENT OF BASE UNIT AND I/O NUMBER
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4.2 I/O Number Assignment
4.2.1 Concept of I/O number assignment
(b) Precautions for using remote station I/O numbers
1) Setting for future extension
When the input (X) and output (Y) of the CPU module are used for the I/O numbers on the remote station,
consider future extension of I/O modules and/or intelligent function modules on the CPU module side.
2) When MELSECNET/H and CC-Link are used
I/O numbers to the refresh target (CPU module side device) of MELSECNET/H and to the CC-Link remote I/
O system must be unique.
● When network parameter setting has not been made in the CC-Link system, X/Y 1000 to 17FF (2048 points) are
assigned to the CC-Link system master/local modules of lower numbers.
● There are no restrictions on the I/O number assignment order for the MELSECNET/H remote I/O networks, CC-Link, or
other networks.
● Space can be provided between the I/O area for MELSECNET/H remote I/O station and the I/O area for CC-Link
remote station.
Figure 4.7 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
Empty
Input/output (X/Y)
For future expansion
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 and/or intelligent function
modules and X/Y400 to 4FF (256 points) are secured for future extension
For CC-Link remote
I/O station
to
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