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3 Part Names and Functions
NX-series Safety Control Unit User’s Manual (Z930)
3-1 Safety CPU Unit
3
3-1-2 Indicators
The Safety CPU Unit has indicators that show the current operating status and communications status.
The rest of this section gives the indicator specifications.
The TS indicator shows the current status of the Safety CPU Unit and the communications status with
the Communications Coupler Unit.
The following table lists the possible states for this indicator and what they mean.
3-1-2 Indicators
WARNING
Do not use the status of the indicators on the NX-series Safety Control Units for safety opera-
tions. This will compromise the safety functions of the Unit and may cause serious injury in the
event of an accident.
Letter Name Function
(A) Model number display Displays part of the model number of the Safety CPU Unit.
The model number indication is red on Safety Control Units.
(B) Indicators Show the current operating status and communications status
of the Safety CPU Unit.
TS Indicator
Color Status Meaning
Green Lit. The Unit is operating normally.
Flashing at 2-s
intervals.
Initialization is in progress (from when the power supply is turned
ON until RUN or PROGRAM mode is entered), or I/O allocation
information data is being downloaded from the Sysmac Studio.
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.
• The Unit is restarting.
• Waiting for initialization to start
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