5 Place the Safety CPU Unit in DEBUG mode.
Refer to 7-4 Changing to DEBUG Mode on page 7 -
17 for a detailed procedure.
6 On the Safety CPU Unit Setup and Programming View, select Safety Validation from the
Controller
Menu to transfer the safety programs to the non-volatile memory.
Refer to 7-10-1 Performing Safety Validation on page 7 - 56 for a detailed procedure.
7 Change the operating mode of the Safety CPU Unit to RUN mode. Or, cycle the power supply
to Safety CPU Unit.
Refer to 7-10-2 Changing to RUN Mode
on page 7 - 57 for a detailed procedure.
l
When Using an SD Memory Card
Refer to Section 10 Safety Unit Restore on page 10 - 1 for details when you use an SD Memory
Card.
Checking after Replacing a Unit
• After a Unit is replaced, make sure that the intended data was transferred to the Safety CPU Unit by
using the following methods.
a) Make sure that the safety signature that is shown in the Safety Properties Dialog Box for the
safety project is the same as the safety signature that is shown in the Controller Status Pane.
b) When you use an SD Memory Card, make sure that the safety signature that is shown in the
seven-segment indicator of the Safety CPU Unit
is the intended signature.
• 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 Safety CPU Unit due to the replace-
ment work.
13-2-2
Replacing Safety I/O Units
l
Precautions before Replacing the Units
• The replaced Safety I/O Units must be in the default status before the replacement.
If you are unsure of whether the Safety I/O Units are in the default state, perform the Clear All
Memory operation for all Safety I/O Units that were replaced. Refer to 7-14
Restarting and Clear
-
ing All Memory on page 7 - 66 for detailed 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.
l
Replacement Procedure
1 Record the relationship between the wiring and the terminal numbers before you remove the
terminal block from the Safety I/O Units
.
2 Remove the Safety I/O Units to replace.
13 Inspection and Maintenance
13 - 7
NX-series Safety Control Unit User's Manual (Z930)
13-2 Maintenance Procedures
13
13-2-2 Replacing Safety I/O Units
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