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P ERR Indicator
The P ERR indicator shows the error status of the running program or settings of the Safety CPU
Unit.
The following table lists the possible states for this indicator and what they mean.
Color Status Meaning
Red Lit The safety program, CIP Safety communications, and
FSoE communications stopped due to the running program
or settings, which resulted in error.
Flashing (at 1-s intervals) Local error occurred in the running program.
--- Not lit No errors in the running program or settings
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RUN Indicator
The RUN indicator shows the execution status of the programs for the Safety CPU Unit.
The following table lists the possible states for this indicator and what they mean.
Color Status Meaning
Green Lit Execution of a safety program is in progress (operation is in
progress in RUN mode, or DEBUG mode (RUN)).
Flashing (at 1-s intervals) Initialization is in progress (from when the power supply is
turned ON until RUN or PROGRAM mode is entered).
--- Not lit Operation is in progress in PROGRAM mode or DEBUG
mode (STOPPED), or a fatal fault has occurred.
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DEBUG Indicator
The DEBUG indicator shows the status whether the debug function can be executed on Safety
CPU Unit.
Refer to 6-8-3 Controlling BOOL Variables, Changing Present V
alues, and Using Forced Refresh-
ing on page 6 - 82 for the debug function of Safety CPU Unit.
The following table lists the possible states for this indicator and what they mean.
Color Status Meaning
Yellow
Lit Operation is in progress in DEBUG mode. (the debug func-
tion can be executed)
--- Not lit Operation is in progress in a mode other than DEBUG
mode or a fatal fault has occurred. (the debug function can-
not be executed)
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VALID Indicator
The VALID indicator shows whether safety validation has been performed on the safety application
data in the Safety CPU Unit.
The following table lists the possible states for this indicator and what they mean.
2 Specifications
2 - 14
NX-series Safety Control Unit User's Manual (Z930)
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