Signal Status In The Event Of A Fault (Fail Safe - Festo CPX Series Electronic Manual

C. General information
C.1.3 Signal status in the event of a fault (Fail safe)
Festo P.BE-CPX-SYS-EN en 0112NH
Basic information
With the aid of the so-called Fail safe parametrizing, the signal
status which the outputs are to assume in the event of field
bus communication faults, can be determined (Fail safe
status). In this way, a defined machine/system status should
be created in the event of field bus communication faults
(e.g. failure of the higher-order PLC/IPC).
Warning
Depending on the functionality of the machine/system, the
manipulation of signal states can cause serious injury to
human beings and damage to property.
Use the Fail safe parametrizing very carefully, in order to
avoid damage.
CPX parametrizing
With CPX terminals, fail-safe parametrizing can be used for:
– digital outputs
– analogue outputs
– valves.
By means of the system parameter fail-safe, you can globally
determine the signal status which the outputs/valves are to
assume in the event of field bus communication faults, e.g. in
the event of:
– communication failure (bus interruption, PLC failure)
– communication stop.
C-9