2. Commissioning
2-40
Festo P.BE-CTEU-PB-OP+MAINT-EN en 1208NH English
2.8 Fail state behaviour
Fai l state regulates the behaviour of the bus node and the
connected equipment in the event of communication mal-
functions.
Parameterisation The behaviour of the bus node is dependent on the DIL switch
setting (see chap. 1.4) and the configured behaviour of the
master in the case of:
– telegram failure
– interruption of the fieldbus line
Depending on the parameterisation, the outputs (valves and
electric outputs) wil l be switched off (factory setting),
switched on or retain their status (see Tab. 2/10).
W arning
An incorrect status of the v al ves and outputs can lead to
dangerous situations!
•
Ensure that valves and outputs are put into a safe status
if the stated malfunctions occur.
Note
Please observe the following if the outputs are reset in the
event of fieldbus interruptions or malfunctions:
– Monostable valves move to the basic position
– Bistablevalvesremaininthecurrentposition
– Mid-position valves go into mid-position (pressurized,
exhausted or closed, depending on valve type).
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