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3 Part Names and Functions
NX-series Digital I/O Unit User’s Manual (W521)
3-2 Indicators
3
3-2-1 TS Indicator
The meanings of light statuses are described as follows:
3-2-1 TS Indicator
Color Status Description
Green Lit • The Unit is operating normally.
• The Unit is ready for I/O refreshing.
• I/O checking is operating.
*1
*1. Refer to the manual for the Communications Coupler Unit for the status of the indicator on the Communications
Coupler Units when I/O checking is in progress.
Flashing at 2-s
intervals.
• Initializing
• Restarting is in progress for the Unit.
• Downloading
Red Lit A hardware failure, WDT error, or other fatal error that is common to
all I/O Units occurred.
Flashing at 1-s
intervals.
A communications error or other NX bus-related error that is common
to all I/O Units occurred.
--- Not lit • No Unit power supply
• Restarting is in progress for the Unit.
• Waiting for initialization to start
This indicator shows the current status of the Digital I/O Unit and its communications
status with the CPU Unit or with the Communications Coupler Unit.
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