Functional Method Of The Input Module - Festo CPX-F8DE-P Manual

1. System overview CPX-F8DE-P
1.3

Functional method of the input module

Festo P.BE-CPX-F8DE-P-E N en 1610a English
Automatic acknowledgment is possible by holding the ac­
knowledgment bit permanently at "1".
If acknowledged while an error is still present, the input im­
age remains in safe mode. In the event of undesired automat­
ic acknowledgment, a safety program must ensure that the
safety controller cancels that acknowledgment.
Note
In the event of a restart of the F-Host (Stop è Run), the
channel monitoring function of the input module
CPX-F8DE-P also restarts.
If the cause of the error is still present, the channel error
will be triggered again.
The inputs on the input module are always evaluated using 2
independent internal channel paths. To this end, the input
module is equipped with 2 processors that monitor one an­
other continuously and can also monitor the input channels
for cross-circuiting, depending on the selected function
modes.
The input module is designed such that the input channels
can provide either secure data or no data at all, even when a
fault is present in the system, e.g. with:
– overvoltage, undervoltage, overload, short circuit and
cross circuit
– Failure or malfunction of communication via PROFIsafe
– Failure or defect of individual safety-determining compon­
ents of the input module.
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