12-2
Checking for Errors with the Indica-
tors
You can use the indicators on the NX Units to check the NX Unit status and errors.
This section describes the meanings of errors that the indicators show and the troubleshooting proce-
dures for them.
12-2-1
Troubleshooting the Main Errors in the Safety CPU Unit
NX-SL3300/NX-SL3500
TS indicator FS indicator Cause Corrective action
--- Status is normal.
System Error Refer to System Error
( page 12 - 32).
1-second interval
NX Bus I/O Communica-
tions Stopped
Refer to NX Bus I/O Com-
munications Stopped
( page 12 - 43).
1-second interval 1-second interval
NX Unit I/O Communica-
tions Error
Refer to NX Unit I/O Com-
munications Error ( page
12 - 35).
2-second interval
---
• Initializing
• Downloading
Status is normal. Wait un-
til processing is complet-
ed.
12 Troubleshooting
12 - 3
NX-series Safety Control Unit User's Manual (Z930)
12-2 Checking for Errors with the Indicators
12
12-2-1 Troubleshooting the Main Errors in the Safety CPU Unit
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