Festo DLP-VSE Series, Manual

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5. Diagnosis
5-6
Festo P.BE-DLP-VSE-... en 0206a
5.2.3 Diagnostic words
The following error states of the Local control unit are
grouped into diagnostic words and passed on to the DP
master:
– Failure of the load voltage supply to the valve (pin 5 of the
socket for the power supply)
– Short circuit in power supply to the sensors
– Failure of the load voltage supply at the outputs
– Short circuit/overload at the outputs
– Drop below lower tolerance in voltage supply to proces-
sing valves ( < 20.4 V)
– Diagnostic measurement bus
Diagnostic possibilities
As a slave on the PROFIBUS DP the Local control unit offers
extensive diagnostic possibilities via the PROFIBUS-DP. The
diagram below shows the steps which are necessary for diag-
nosing the Local control unit.
1 2 3 0 4 5 6 7
1 2 3 0 4 5 6 7
1 2 3 0 4 5 6 7
1
Bit
Station status 1
Device-related diagnosis 1
Bit
Bit
Device-related diagnosis 2
Device-related
diagnosis exists
see chapter 5.2.4
see chapter 5.2.4
Fig. 5/7: Diagnostic steps