Omron NX-SID Series User Manual page 399

Precautions for Correct Use
Checking the Serial Numbers of NX Units
• If the Serial Number Check Method setting on the Communications Coupler Unit is set to
Setting = Actual device, temporarily change this setting to No check, and then replace the NX
Unit. Get the serial number of the new NX Unit, and then set the Serial Number Check
Method setting on the Communications Coupler Unit to Setting = Actual device again. If you
replace the NX Unit with the Serial Number Check Method setting set to Setting = Actual
device, a Unit Configuration Verification Error will occur.
• Refer to the user's manual for the Communications Coupler Unit for details on the serial
number checking function for Communications Coupler Units.
Additional Information
If you replace a Safety I/O Unit while the Safety CPU Unit is in operation, a communications
error event will be logged in the following Units. After the replacement, clear the event logs as
necessary.
• Safety CPU Unit
• Safety I/O Units on the same Slave Terminal that were not replaced
• The Communications Coupler Unit to which the Safety CPU Unit or Safety I/O Unit where a
communications error was detected is connected
NX-series Safety Control Unit User's Manual (Z930)
10 Maintenance and Inspection
10
10 - 7