Modbus RTU serial 485 read a double float

RichFranzo

• 2018年04月09日 15:53

I am new to the Flexy. I am a system integrator attempting to collect a flow meter totalizer register that is a double float via Modbus 485. I have established a connection and successfully collected integers and single floats. The totalizer is a large number that is only represented as a double float for accuracy. I am using a 201 with a serial card.

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  hms_support

  • 2018年04月09日 15:55

  @RichFranzo

  The eWON will only be able to read a maximum of 32 bits.
  Double floats are not natively supported in the eWON due to this (64 bits).

   

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  RichFranzo

  • 2018年04月09日 17:58

  Thanks for the response Joe.
  Although the double float is a 64 bit number it resides in the meter as four words. The problem is I can't collect four words with the Ewon, the "Data Type" selection limits me to an Integer (one word) or float (two words).
  Currently I use a 32bit PLC to collect the four words and then manipulate it to a 32 bit float. In the PLC I can tell it to start at this address and collect four words. Is there any work around in the Ewon where I can tell it to collect four words? The only thing I use the PLC for is to collect and manipulate this data point.

  Thanks,
  Rich

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  hms_support

  • 2018年04月10日 14:25

  @RichFranzo

  You could try reading these 4 Word registers separately and compute the 32 bit equivalent value in BASIC and store it in a Tag. However, you will lose precision when doing this.

  RG-006-0-EN-(Programming%20Reference%20Guide).pdf

   

   

   

   

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