Festo Контроллер позиционирования CPX-CMPX - Manual (Page 203)

C. General information on parametrisation
C−5
Festo P.BE−CPX−SYS−EN en 0902e
C.2 Signal extension
Fundamentals
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 exĆ
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 exĆ
ceeded, can fluctuate according to the positioning speed.
There is a danger here that the short signals are not always
recognised" due to long cycle times of the higher−order
controller.
With CPX terminals, a signal extension time can be defined by
parametrisation of the appropriate input signal. Short signals
will then also be recognised reliably by the higher−order conĆ
troller.
CPX parametrisation
With the CPX terminals, the signal extension time for the moĆ
dule is set with the appropriate module parameter. The possĆ
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 paraĆ
meter. When preset, the signal extension time is inactive.