Omron CS1W-ETN21 - Manual (Page 85)

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Converting from Previous Models Section 2-12
Note If an error occurs in the mode change, remove the Ethernet Unit,
create the I/O tables, and correct the settings using the procedures
described in this section.
7. Turn OFF the power to the PLC and return the Ethernet Unit's rotary
switches for the node address to its original setting.
8. Turn ON the power to the PLC.
Node address Indicators
Ч
16
1 Ч
16
0 RUN ERC ERH
- - Lit Not lit Not lit