Practical Tips

Connecting the fill-level measuring transducer to a PLC

Measuring transducers, especially 2-wire measuring transducers often have the measuring signal available as current in the 4 to 20 mA range. However, for the analog input card of a PLC, input voltages are required within the 0 to 10 V range or 0 to 5 V.

Ideally, a standard signal isolation amplifier complements your system in two ways at once:

  • The isolation amplifier converts the current-measuring signal into the appropriate voltage signal
  • Thanks to the isolation amplifier you additionally have the galvanic isolation of the inputs

Go back