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FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
9 CC-Link/LT Built-in master ability (Only FX3UC-32MT-LT)
9.11 Assignment of I/O numbers
FX3UC Series Programmable Controllers
User’s Manual - Hardware Edition
9.11 Assignment of I/O numbers
The Built-in master assigns I/O information for remote I/O modules to devices X (input) and Y (output) in the
PLC.
The I/O numbers are assigned in CONFIG mode.
The I/O numbers are assigned in octal serial numbers following the I/O number occupied by the PLC (Main
unit, I/O extension block etc.) where eight points are handled as one block.
9.11.1 I/O number assignment types
1. When connecting all remote I/O units and assigning I/O numbers
When all remote I/O units are connected, and the I/O configuration is not changed.
→ For details, refer to "Subsection 9.11.3 Automatic I/O numbers assignment".
2. When assigning unused numbers without connecting remote I/O units
When a remote I/O unit (station number) is not connected, a reserved station (I/O number assignment) can
be specified from GX Developer to avoid a change in the I/O numbers in the future from the connection of
another remote I/O unit.
• When assigning I/O numbers without connecting a remote I/O unit and creating a program
→ For details on editing the detailed remote station information, refer to Section 9.13.
• When additionally connecting a remote I/O unit (to the existing system) in the future
→ For details on the specification of a reserved station, refer to Section 9.12.
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