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PLC with fast analog acquisition

Home Forum Controllori SlimLine e Netsyst (LogicLab) PLC with fast analog acquisition

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  • #36151
    Arkadiusz
    Partecipante

    I am looking for a fast PLC for processing a piezoelectric +/- 1 VDC signal. The PLC has to measure the amplitude of the voltage peaks caused by the passing of cars of different masses. An analog-to-digital converter of 12-15 bits is required and a quick scan of the program less than 200 microseconds.

    Can you tell me if any of your products can solve this problem ?

    #39963
    Sergio Bertana
    Amministratore del forum

    Our SlimLine LogicLab IEC61131-3 Cortex M7 CPU has a 12 bits ADC converter that can convert a signal in less than 5 uS. So you can write a program to be executed in the Task Fast that acquire the signal and make all the calcules you need. The Fast task is ran every 1 mS but with the SysSetTaskLpTime (set task loop time) function, you can modify the execution time (Minimum value 100 uS).

    The ADC converter can acquire only positive voltage values from 0 to 10 volts. So if you need to acquire positives and negatives values you have to design an analog circuit capable to offset to 1 volt the analog value and multiply it by 5.

    When the sensor value is in the positive range (From 0 to 1 Volt) the ADC reads values from 0 to 5 volts. When the sensor value is in the negative range (From 0 to -1 Volt) the ADC reads values from 5 to 0 volts.

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