Festo CPX-P-8DE-N Series, Описание

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3. Input module CPX-P-8DE-N-...
3-13
Festo P.BE-CPX-P-EA-EN en 1209NH English
3.3.2 Processing the I/O signals - Extended process image
If the miniature switch of the module is set to ON, the module
makes four operating modes available for processing the
input signals. The desired operating mode can be specified
separately for each input by means of parameterisation,
provided that the corresponding input supports the mode.
Operating mode
(input function) Supported
by channel Brief description
A Digital input (Namur) 0 … 7 Digital value of the input status
B Counter 0 … 3 Incremental and decremental counters, which count
rising or falling edges of the input signal, can be selec-
ted (
section 3.3.5).
1)
Counting is either started from the lower or upper limit
value to the end of the counting range depending on the
type of counter selected. Upon reaching the relevant
limit value a bit is set in the PII (limit value reached).
C Frequency measure-
ment
up to 1 kHz 0 … 3 Pulses of the digitised input signal are counted within a
parameterised gate time (
section 3.3.6).
The frequency is calculated at the end of the gate time.
If the value falls below the lower limit value (LLV) or
exceeds the upper limit value (ULV), a bit is set in the PII
(limit value fallen below/exceeded).
1)
D Frequency measure-
ment up to 10 kHz 0 Only possible for input channel 0:
same as operating mode C, but with a frequency range
up to 10 kHz
1)
1)
Current counter readings and frequencies can be represented in the process image inputs (PII)
(
Tab. 3/9).
Tab. 3/8: Possible operating modes – Extended process image (miniature switch = ON)