Festo CPX-FB13 - Fault Treatment (Fail Safe)

3. Diagnosis
3−21
Festo P.BE−CPX−FB13−EN en 0811c
3.6 Fault treatment (Fail safe")
Parameterisation The reaction of the CPX terminal to the following faults
depends on the configured reaction of the master module
and the parameterised fail−sa
fe setting:
Telegram failure
The master has stopped
Interruption in the bus cable
Depending on parameterisation, the outputs (valves and
electric outputs) will be switc
hed off (factory setting),
switched on or retain their status.
Further information about the fail−safe setting can be found in
the CPX system manual P.BE−
CPX−SYS−...
Warning
· Ensure that valves and outputs are put into a safe state
if the faults named occur.
An incorrect status of the valves and outputs can lead to
dangerous situations!
Note
Please note the following if the outputs are reset after PLC
stop, field bus interruption or fault:
 Single−solenoid valves move to the basic position.
 Dou
ble−solenoid valves remain in the current position.
Mid−position valves move to the mid−position
(depending on valve type: vented, purged or blocked).