Color Status Meaning
Red Lit. A hardware error, WDT error, or other critical error has occurred.
Flashing (at 1-s
intervals)
An NX bus communications error, I/O allocation information data error, or
other recoverable minor error that is attributed to the NX bus has occurred.
---
Not lit.
• There is no Unit power supply
.
• Restarting the Unit
• W
aiting for initialization to start
l
FS Indicator
The FS indicator shows the safety communications status and safety function status of the Safety
CPU Unit.
The following table lists the possible states for this indicator and what they mean.
Color Status Meaning
Green
Lit. All FSoE connections are established and there are no errors in any
Safety CPU Unit functions.
Flashing (at 1-s in-
tervals)
One or more FSoE connections are not established or are currently
being established and there are no errors in any Safety CPU Unit
functions.
Red Flashing (at 1-s in-
tervals)
An FSoE communications error, program execution error, or other
minor error that is attributed to the safety application has occurred.
*1
Green/Re
d
Alternates at 1-s in-
tervals.
The safety application data has not been stored.
--- Not lit. Power is not being supplied or a fatal fault has occurred.
*1. For approximately 30 seconds after the power supply to the Safety CPU Unit is turned ON, a Safety Process
Data Communications Initialization Error event is not registered as an error if the Safety I/O Units
do not
exist. During that time, the FS indicator will flash green.
l
RUN Indicator
The RUN indicator shows the execution status of the safety programs.
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.
l
DEBUG Indicator
The DEBUG indicator shows the status whether the debug function is executable 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.
2 Specifications
2 - 11
NX-series Safety Control Unit User's Manual (Z930)
2-1 Safety CPU Unit
2
2-1-3 Indicators
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