Color Status Description
Green Lit The Unit is operating normally.
The Unit is ready for I/O refreshing.
Flashing (at 2-s in-
tervals)
• 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 in-
tervals)
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
UNIT PWR Indicator
This is mounted only on an Additional NX Unit Power Supply Unit.
This indicator shows the NX Unit power status of
an Additional NX Unit Power S
upply Unit.
Color Status Description
Green Lit The Unit power is supplied.
Not lit The Unit power is not supplied.
I/O PWR Indicator
This is mounted only on the Additional I/O Power Supply Unit.
This indicator shows the I/O power supply status of
an Additional I/O Power Supp
ly Unit.
3 Part Names and Functions
3-7
NX-series System Units User's Manual (W523)
3-1 Names of Power Supply-related Unit Parts
3
3-1-2 Indicators
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