A.5.2 Signal Extension (Only With Cp−El Modules) - Festo CPI-CL Series Manual

A. Technical appendix
A.5.2 Signal extension (only with CP−EL modules)
A−24
Basics
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
recognised" due to long cycle times of the higher−order con
troller.
With the CPI system, a signal extension time can be defined
by parameterisation of the appropriate input signal. Short
signals will then also be recognised reliably by the higher−
order controller.
Parameterisation in the CPI system
With the CPI system, the signal extension time for the module
is set with the appropriate module parameter. The possible
signal extension times depend on the type of module. Typical
signal extension times are: 0.5 ms (typical presetting), 15 ms,
50 ms and 100 ms.
The user must parameterise the signal extension time for
activation.
Festo P.BE−CPEA−CL−EN en 0711a