Siemens S7-300 - Meaning of the Error Leds

Diagnostics
12.2 Meaning of the error LEDs
FM 352 electronic cam controller
146 Operating Instructions, 05/2011, A5E01071724-03
12.2 Meaning of the error LEDs
Display
The status and error display indicate various error states. The LED is lit, even with errors that
occur briefly, for at least 3 seconds.
6)
Figure 12-1 Status and error displays of FM 352
Display Meaning Notes
SF (red)
LED - ON
Group error for
internal and
external errors
This LED indicates the following error states on the FM 352:
 Hardware interrupt lost
 Watchdog expired
 FM 352 is not configured
 Incorrect FM 352 parameter assignment (only when
parameters assigned with SDB)
 No external 24 V auxiliary supply
 Front connector missing
 Encoder wire break
 Operating error
 Absolute encoder frame error
 Incremental encoder pulse missing or zero mark signal
missing