12 - What are the distinguishing features of a "true" Fieldbus, delivering the original promise?

 

The main characteristics of Fieldbus are:

  • Completely digital replacement of 4-20 mA;
  • Control, alarm, computation and other functions distributed to devices in the field;
  • Multi-vendor interoperable through open specification;
  • Specifically designed for process control;
  • DCS/smart-transmitter and other protocols calling themselves Fieldbus do not show these characteristics;

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