Signal Extension; C.2 Signal Extension - Festo CPX Electronic Manual

C. General information on parametrizing
C.2

Signal extension

C−6
Basic information
Signal extension times are specified when very short signals
are to be taken into account in the control process. Short
signals can occur, e.g. when an intermediate position is ex
ceeded and evaluation is necessary in order to produce a
time−optimised consequent process before an end position is
reached.
Depending on the type of sensor, the length of the signal,
which is generated when the intermediate position is ex
ceeded, can fluctuate according to the positioning speed.
There is a danger here that the short signals are not always
recognized" due to long cycle times of the higher−order con
troller.
With CPX terminals, a signal extension time can be defined by
parameterisation of the appropriate input signal. Short sig
nals will then also be recognised reliably by the higher−order
controller.
CPX parameterisation
With the CPX terminals, the signal extension time for the mod
ule is set with the appropriate module parameter. The poss
ible signal extension times depend on the type of module.
Typical signal extension times are: 0.5 ms, 15 ms, 50 ms and
100 ms.
The signal extension time for each channel can be activated
or deactivated with a further channel−orientated module para
meter. When preset, the signal extension time is inactive.
Festo P.BE−CPX−SYS−EN en 0503b