Tach generator to PLC

Discussion in 'General Electronics Chat' started by carbonel28, Apr 5, 2009.

  1. carbonel28

    Thread Starter New Member

    Apr 5, 2009
    I have a tachometer generator that is used to monitor RPM of a motor. The receiving units reads the frequency to display the RPM. 0-100% is 0 - 70.2 Hz. I need to convert this signal to a pulse to read in a PLC. I will count the pulses and convert to RPM. It would be best to have the output be a switch so I can use the power from the PLC to pass through the switch on an input card.
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    What are the tachometer's specifications?
  3. SgtWookie


    Jul 17, 2007
    What is the output signal from this tach generator? Sine wave, square wave?

    What voltage
  4. carbonel28

    Thread Starter New Member

    Apr 5, 2009
    Sorry........a little new at this.

    It is a tach generator from a gas turbine. It produces a sin wave 0-7 VAC.

    I would like to take it from sine wave to square wave and have it operate a switch so I can connect it to a PLC input card and count the pulse to calculte RPM. I would like to have the PLC source the power to the normally open switch and feed it to the input channel of the PLC.
    Last edited: Apr 7, 2009