Omron NX-SL3300 User Manual page 512

13 Inspection and Maintenance
3
Mount the new Safety I/O Units.
4
Return the terminal block to the new Safety I/O Units.
5
Cycle the power supply to the Safety CPU Unit.
l Checking after Replacing Safety I/O Units
• After the replacement is completed, always perform user testing to make sure that the safety
functions operate correctly. Make sure that the terminal block is inserted into the correct location
on the Safety I/O Units, and check by performing user testing.
Precautions for Correct Use
Checking the Serial Numbers of NX Units
• If the Serial Number Check Methodsetting on the NX bus master is set to Setting = Actual
device, Serial Number Check Method 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 NX bus master 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 NX bus master for details on the serial number checking
function for NX bus master.
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 NX bus master to which the Safety CPU Unit or Safety I/O Unit where a communications
error was detected is connected
13 - 8
NX-series Safety Control Unit User's Manual (Z930)