3. Diagnosti cs
3-19
Festo P.BE-CTEU-EC-OP+MAINT-EN en 1208NH
3.3.7 Error reaction (fail-state settings)
The reaction of the bus node to the followi ng errors is de-
pendent on the parameterised fail-safe setting and the (con-
figured) reaction of the controller, i.e. the PLC, the IPC or the
application program:
– (Master) controller stops
– Network interruption
– Telegram failure
Depending on the parameterisation, the outputs (valves and
electrical outputs) wil l be:
– switched off (output signal reset, in the case of analogue
outputs to 0; factory setting)
– switched on (output signal set, in the case of analogue
outputs to the parameterised value)
– kept in the same state (“freezi ng” of output signal)
You can define two types of error reaction for the controller
(or the application program):
– Hard error reaction:
The controller switches to “STOP”/PRE-OPERATIONAL
mode when a fault occurs
– Soft error reaction:
The controller remains in “RUN”/SAFE-OPERATIONAL (or,
if relevant, OPERATIONAL) mode when a fault occurs
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