Fail State Behaviour - Festo CTEU-PB Electronics Description

2. Commissioning
2.8

Fail state behaviour

Parameterisation
2-40
Fail state regulates the behaviour of the bus node and the
connected equipment in the event of communication mal-
functions.
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) will be switched off (factory setting),
switched on or retain their status (see Tab. 2/10).
Warning
An incorrect status of the valves 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
– Bistable valves remain in the current position
– Mid-position valves go into mid-position (pressurized,
exhausted or closed, depending on valve type).
Festo P.BE-CTEU-PB-OP+MAINT-EN en 1208NH English