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
3 Part Names and Functions
3-13
NX-series System Units User's Manual (W523)
3-2 Names of Shield Connection Unit Parts
3
3-2-2 Indicators
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