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I need 4-20mA output from a modbus slave flowmeter

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  • I need 4-20mA output from a modbus slave flowmeter

    I got a flow meter for a client who wants a 4-20mA output but the OEM supplied one with modbus output.
    Kindly assist me with how i can get the 4-20mA output.


  • #2
    Kindly provide branding, model numbers and preferably links to appropriate documentation of the components involved.

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    • #3
      The flowmeter is an RMG Volume corrector EC 24, i initially bought a DAT3024 from datexel but i was later told i need a master to get the device working before i was refered to this forum.
      Thanks.

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      • #4
        I am guessing that there is some sort of receiving device. Please provide model numbers and preferably links to appropriate documentation of the components involved.

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        • #5
          For the flow meter you can check

          https://www.rmg.com/wp-content/uploa...nual_en_01.pdf

          for the DAT3024 please check

          http://download.hcs-ba.eu/Veldappara...odbuslijst.pdf

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          • #6
            The devices appear to be data (modbus rtu/ascii) only. Do you need the 4-20mA output as DATA or as a real, physical MILLIAMP signal?
            I do not know of a device that you can attach that will inherently convert the measured value from a Modbus register to a physical 4-20mA CURRENT signal.
            I know that PLCs and other programmable devices can do it. Other members may know of Modbus data<->signal conditioner devices.
            Is there a PLC or other programmable control device in the design - which could read the modbus register and construct a real 4-20mA signal?

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            • #7
              Originally posted by jimi_614$$ View Post
              I got a flow meter for a client who wants a 4-20mA output but the OEM supplied one with modbus output.
              Kindly assist me with how i can get the 4-20mA output.
              Return it and purchase the part with the desired interface. It's not interchangeable.

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              • #8
                If he is looking for a physicaly 4-20 ma signal a click PLC could read the modbus data and output the signal inexpensively

                PS dose anyone else have the text change on them when posting from a phone. I have never experienced anything like that excpt this fourm
                Last edited by z28z34man; 10-05-2018, 05:42 PM.

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                • #9
                  It looks like it accepts an option card for current output on plug X2_0. Most flowmeter manufacturers auto-detect option cards nowadays.
                  Part number for the analog expansion card is TERZ94trm

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                  • #10
                    I would try to replace the meter, if no way to output analog is possible with the actual one. I guess he needs analog output cause is trying to fill up and that would need a fast reading, hence accurate. For filling jugs, patching analog through modbus I donít think would work. I mean that while using a click plc to read modbus and output analog could work, will also defeat the purpose of a fast analog read.

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