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Control Systems Theory

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

BASICS OF TRIPS, INTERLOCKS, PERMISSIVES & SEQUENCES

S Bharadwaj Reddy
This post provides information about basics of Trip, Interlock, Permissive and Sequences which are regularly used in instrumentation control systems like ESD, DCS, PLC etc. Trip: The term Trip refers to an action that

Boiler Three Element Controller Philosophy

S Bharadwaj Reddy
A single element control system is one with just one control input, a two element control system is one with two control inputs, etc. A three-element boiler water level control

4-20mA Loop Power Supply Questions and Answers

S Bharadwaj Reddy
Here we discuss about the general 4-20mA Loop Power Supply Questions and answers come across in industrial instrumentation. 4-20mA Loop Power Supply What is a 4mA to 20mA signal? The 4mA

Transmitters 4-20mA Current Failure Alarm Limits

S Bharadwaj Reddy
4-20 mA instrumentation and controls usually support a signal range slightly below 4 mA and above 20 mA. For transmitters, current values below 4 mA and above 20 mA are

What is Loop Checking ?

S Bharadwaj Reddy
The Loop checking is defined as pre-Commissioning activity which is initiated after installation of instruments in the field and carry out the instrument loop checks between installed field instrument and respective control

Basics of Loop Checks

S Bharadwaj Reddy
The term “loop” can refer to the entire “control loop” from primary element (sensor) through the transmitter, and controller, to the valve positioner, and the final control element (valve). The

How a 4-20mA Transmitter Works ?

S Bharadwaj Reddy
A sensor is an input device that provides a usable output in response to the input measurand. A sensor is also commonly called a sensing element, primary sensor, or primary detector.

4-20 mA Transmitter Wiring Types : 2-Wire, 3-Wire, 4-Wire

S Bharadwaj Reddy
Transmitters are available with a wide variety of signal outputs. The 4-20mA analogue signal is by far the most commonly used in industrial applications. Several physical 4-20mA wiring options exist.

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