reat0ng

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Posts posted by reat0ng

  1. Posted

    4 hours ago, Ken Roach said:

    Does the control room meter display get its signal from the same flowmeter output ?

    When you change over a PLC to a new model, most of the I/O and signals work in a similar way.   But they aren't always exactly the same, so you need to research signals like this one.

    I don't think it's fair to say "it's very strange" until you have examined the whole system and program.

    the meter display in the control room is used for setting water flow volume,and show how much water has been added in the machine.

    and it sends signal to PLC  to show on FTView SE.

    i'll check it out what kind of signal the meter display sends.

  2. Posted

    10 hours ago, Ken Roach said:

    thanks for replying! 

    since the case is just a PLC updating work,i don't know what signal such as pulse rate and the period sent from the flowmeter.

    i'll check the voltage tomorrow,maybe it just the voltage input causes the deviation.

    and because the ladder wasn't written by me so i don't quite know the whole program,but the data won't back to PLC-5 since there is no more wired and powered off.

    the deviation of the volume PLC is always higher than the meter display in control room,very strange.

     

     

  3. Posted

    i'm converting from plc-5 to 1756-L71,old one uses 1771-VHSC to calculate how much water been added.

    the old program set the counter to Counter Mode,No Store,Rollover = 0,Preset = 0 and Scaler = 0. wiring on Input A

    and i do all the same on rslogix 5000 with 1756-HSC,but the data has a little deviation at about 10% compare to original data

    how to solve this problem? thanks

    https://imgur.com/ywWV99n

    https://imgur.com/0npVCxJ

    https://imgur.com/VSpTPFS

    https://imgur.com/2fVKOcW

    https://imgur.com/olP0CR8