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Control Systems Theory

Distributed Control System Objective Questions

S Bharadwaj Reddy
You can find the top 10 objective questions and answers on distributed control system (DCS). A quiz also available at the end of the article to practice the questions and...

How to choose between PLC and DCS Systems ?

S Bharadwaj Reddy
PLC or DCS System ? The following steps discuss about How to choose PLC or DCS systems ? Step 1: Does process require implementation of advanced process control (APC)? No doubt,...

Instrumentation Earthing

S Bharadwaj Reddy
Earthing is the process of creating an alternative path for the flow of fault/excessive currents safely into the ground in the presence of minimal resistance or impedance. The primary purpose...

Process Control Loop Testing

S Bharadwaj Reddy
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output. In other words, the process is perturbed (the highly technical...

Identify Level Control Loop Tuning Problems

S Bharadwaj Reddy
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where considerable amount of vibration exists, but it seems to have...

Process Control High Level Alarm Fault Analysis

S Bharadwaj Reddy
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation, in this sour water stripping tower unit (where sulfide-laden water...

Compressor Emergency Shutdown Root Cause Analysis

S Bharadwaj Reddy
The compressor emergency shutdown system (ESD) has tripped the natural gas compressor off-line three times in the past 24 hours. Each time the operator goes to reset the compressor interlock,...

Liquid Flow Control Loop Controller Action

S Bharadwaj Reddy
A liquid flow control loop consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and output an electronic signal corresponding to the flow. A flow...

Difference between DCS & PLC Systems

S Bharadwaj Reddy
DCS stands for Distributed Control System and PLC stands for Programmable Logic Controller. Do you know the Difference between DCS and PLC Systems ? Difference between DCS & PLC Systems...

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