Siemens SIMATIC FM 452, Manual

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Diagnostics
11-3
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
11.2 Meaning of the Error LEDs
The status and error displays indicate various error states. The LEDs are lit, even
with errors that occur briefly, for at least 3 seconds.
INTF
EXTF
Figure 11-1 Status and Fault/Error Indicators of the FM 452
Indicator Meaning Explanation
INTF (red)
LED – ON
Group error for
internal errors This LED indicates the following error states on the FM 452:
•
Hardware interrupt lost
•
Watchdog expired
•
The FM 452 not configured.
•
Incorrect FM 452 parameter assignment (only when
parameters assigned with SDB)
EXTF (red)
LED – ON
Group error for
external errors This LED indicates the following error states:
•
No external 24 V auxiliary supply
•
No front connector
•
Encoder wire break
•
Operating error
•
Absolute encoder frame error
•
Incremental encoder pulse missing or zero marker missing
INTF
EXTF
Module defective All outputs are disabled. The module must be replaced.