3. Input module CPX-P-8DE-N-...
3-24
Festo P.BE-CPX-P-EA-EN en 1209NH English
The “Frequency measurement” operating mode is specified
via the parameter “Operating mode of the input channel”
(
Tab. 3/20). The frequency measurement can be switched
on and off via the process image outputs (
Tab. 3/10).
The frequency measured in the last gate period is shown in
the PII (byte 2 ... 9). An update is always effected at the end
of the respective gate period. The length of the gate time
thereby determines the resolution accuracy of the frequency
measurement and the speed at which the measured value is
updated (
Tab. 3/31). For information regarding measure-
ment accuracy
Technical data.
The corresponding bit in byte 0 of the PII supplies the alarm
signal (frequency in the permissible range or limit value not
reached/exceeded).
Hysteresis for alarms:
To prevent the alarm bit from being accidentally switched
back and forth, the bit is only reset again if a difference of at
least 2 signal edges has been determined in the following
measurement. At a gate time of 10 ms, for example, this cor-
responds to a difference of 200 Hz (a difference of 2 signal
edges within the gate time of 10 ms).
The following applies for the limit values:
–
Lower limit value (LLV) < upper limit value (ULV)
–
Difference between LLV and ULV: > than 2/T
Tor
Gate time
[ms]
Difference between LLV and ULV [Hz]
10
›
200
100
›
20
1000
›
2
5000
›
2
Tab. 3/16:
Required difference between LLV and ULV
Содержание CPX-P-8DE-N Series
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Страница 34: ...1 Overview and connection technology 1 14 Festo P BE CPX P EA EN en 1209NH English...
Страница 35: ...Mounting and dismantling 2 1 Festo P BE CPX P EA EN en 1209NH English Chapter 2 Mounting and dismantling...
Страница 50: ...2 Mounting and dismantling 2 16 Festo P BE CPX P EA EN en 1209NH English...
Страница 51: ...Input module CPX P 8DE N 3 1 Festo P BE CPX P EA EN en 1209NH English Chapter 3 Input module CPX P 8DE N...
Страница 113: ...Technical appendix A 1 Festo P BE CPX P EA EN en 1209NH English Appendix A Technical appendix...
Страница 125: ...Index B 1 Festo P BE CPX P EA EN en 1209NH English Appendix B Index...
Страница 126: ...B Index B 2 Festo P BE CPX P EA EN en 1209NH English Table of contents B Index B 1...
Страница 132: ...B Index B 8 Festo P BE CPX P EA EN en 1209NH English...