Omron NX Series User Manual page 172

8 Applicable Support Software for IO-Link Systems
Precautions for Correct Use
Allocate the process input data from and process output data to IO-Link devices consecutively
starting from data 01. A setting error will occur if the data allocations are not consecutive or are
in reverse order.
A Slave Initialization Error occurs in the IO-Link Master Unit.
Examples: When the sequence is reversed, when allocations are not consecutive, and when
there is port 1 data for port 2.
• To save the I/O data size for unused ports, clear the selections of the PDO mappings for the
unused ports in the PDO mapping list.
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NX/GX-series IO-Link System User's Manual (W570)