10-2-2 Replacing A Safety I/O Unit - Omron NX-SID Series User Manual

10 Maintenance and Inspection
Checking after Replacing a Safety Control Unit
• After a Unit is replaced, make sure that the intended data was transferred to the Safety CPU Unit by
using the following methods.
• Make sure that the safety signature that is shown in the Properties Dialog Box for the safety proj-
ect is the same as the safety signature that is shown in the Controller Status Pane.
• After the replacement is completed, always perform user testing to make sure that the safety func-
tions operate correctly.
• If necessary, clear the event log of any events that remain in the Safety CPU Unit due to the replace-
ment work.

10-2-2 Replacing a Safety I/O Unit

 Precautions before Replacing the Unit
• The replaced Safety I/O Unit must be in the default status before the replacement.
If you are unsure of whether the Safety I/O Unit is in its default state, perform the Clear All Mem-
ory operation for all Safety I/O Units that were replaced. Refer to 8-13 Restarting and Clearing All
Memory on page 8-58 for detailed operating procedures.
• Replacement work must be performed only by personnel with knowledge of safety controls.
• To ensure the safety of all workers, turn OFF the power supply to all hazard sources (i.e., actua-
tors, etc.). Alternatively, place the NJ/NX-series CPU Unit in PROGRAM mode.
 Replacement Procedure
1
Record the relationship between the wiring and the terminal numbers before you remove the
terminal block from the Safety I/O Unit.
2
Remove the Safety I/O Unit to replace.
3
Mount the new Safety I/O Unit.
4
Return the terminal block to the new Safety I/O Unit.
5
Change the operating mode of the Safety CPU Unit to RUN mode. Or, cycle the power supply to
Safety CPU Unit.
Refer to 8-9-2 Changing to RUN Mode on page 8-50 for a detailed procedure.
 Checking after Replacing a Safety I/O Unit
• After a Unit is replaced, make sure that the intended data was transferred to the Safety CPU Unit
by using the following methods.
• Make sure that the safety signature that is shown in the Properties Dialog Box for the safety
project is the same as the safety signature that is shown in the Controller Status Pane.
• After the replacement is completed, always perform user testing to make sure that the safety func-
tions operate correctly. Make sure that the terminal block is inserted into the correct location on
the Safety I/O Unit, and check by performing user testing.
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NX-series Safety Control Unit User's Manual (Z930)