Fieldbus and Contemporary Standards

  • R. Murugeshan


Conventionally, the controller in the field was the heart of the control system housing all components including indicating, recording and controller tuning features with the final control element (control valve or an actuator) physically located away from the controller unit. Slowly, ‘fullscope’ and ‘transcope’ controllers moved into the control room. 3 to 15 psig and 4 to 20 mA signals came into being as the standardized signals from the field transmitters to the secondary devices like high/low selectors and controllers in the centralized control room. It was becoming quite difficult and costly rather to procure replacement parts for pneumatic devices that have become over-aged and unreliable in demanding environments. In the 1980’s, in the early computer era, field analogue signals were wired to the signal conditioning units then on to analogue to digital converters for processing in the microprocessor unit and then with digital to analogue converters to carry the controller output signal to the final control element via electro-pneumatic positioner. This dominant practice was in vogue for well over ten years, maintaining the centralised control room concept. Major problems associated with earlier measurements faced with most field transmitters were resolved with products using semiconductor technology. With improved reliability in harsh environments and higher speed of response, electronic transmitters were readily accepted for wide usage by all process industries by late 1980’s. ‘Smart’ transmitters came into the market carrying superimposed digital signal, over the 4–20 mA measurement parameter, offering features for remote diagnosis.


Transmission Control Protocol Programmable Logic Controller Function Block Internet Protocol Address International Electrotechnical Commission 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2003

Authors and Affiliations

  • R. Murugeshan
    • 1
  1. 1.Department of Instrumentation & Control Engineering, SRM Engineering CollegeMadras UniversityIndia

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