Siemens SIMATIC ET 200SP Manual page 30

Diagnostic alarms
5.1 Status and error displays
Fn LEDs
Table 5- 4
LED PWR
Table 5- 5
30
F1, F2, F3 and F4 LED error displays
F1, F2, F3 or F4
Off
On
Status display of the PWR LED
PWR
Off
On
Communication module IO-Link Master CM 4xIO-Link (6ES7137-6BD00-0BA0)
Meaning
No error
Error
Meaning
Supply voltage L+ missing
Supply voltage L+ present
Manual, 10/2017, A5E03856846-AD