Question

Please answer and write clearly

Explain the use of the different MODES of control available in a controller of a Distributed Control System.

Answer 1

The use of different modes of control available in a controller of a Distributed control system. (DCS) 1. Instead of talking about the distributed control system (DCS) would prefer to be more generic and talk about the process control system (PCS). 2. That means, what follows applies to any PCS, based on DCS (or) PLC-HMI technology. 3. There is no control modes in term of hardware, because modern PCS components are totally flexible and support whatever is needed for a required control system functionality 4. PCS physical main components are the PCS controller and the PCS HMI. PCS HMI are computer based and oriented to interface with the people. 5. The PCS controller, receive input from process generate the output to process and include all the logic to generate the outputs. \r\n 6. For those, PCS has a lost of different. Software functions that could also be reffered as controllers. i.e., PID controllers etc., implies In terms of operation, an