Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 176 / 198

Errors and diagnostics
10.1 Error Display via the Group Error LEDs
FM 350-1 Counter module
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Manual, 05/2011, A5E03648639-01
10.1 Error Display via the Group Error LEDs
Where is the Fault Indicated?
If the red group error LED lights up, a fault has occurred either on the module (internal fault)
or at the cable connections (external fault).
Which Errors Are Displayed?
Table 10- 1 Error Types Displayed by the Group Error LED
Type of error Cause of the error Correction
Fault in EPROM TEST Module replacement
Fault in RAM TEST Module replacement
Watchdog tripped Module replacement
Lost hardware interrupt Increase time between the interrupt
causes
Internal faults
Module parameterization missing Assign parameters and transfer
Coding plug wrongly connected Correct the position of the coding plug
Auxiliary voltage 1L+/1M not connected
or 24 VDC encoder supply short-
circuited
Correct connection
5.2 VDC encoder supply short-circuited
or overloaded
Correct connection
Fault in 5 V encoder signals (wirebreak,
short-circuit, cable missing)
Correct connection
External errors
Module parameterization does not
match the position of the coding plug
Correct parameterization and transfer,
or reconnect the coding plug
Initiating a Diagnostics Interrupt
All faults except the EPROM test fault, can initiate a diagnostics interrupt provided you have
enabled the diagnostics interrupt in the relevant parameterization screen. You can see which
fault has caused the LED to light up from the diagnostics data sets DS0 and DS1. The
assignment of the diagnostic data records DS0 and DS1 is described in the next section.