DCS Archives - Instrumentation Tools

Readings Mismatch between Field & Control Room ? Why

S Bharadwaj ReddyMarch 18, 2019August 20, 2019

Instrumentation maintenance engineer often hears about process value mismatch from field transmitter display reading and control room DCS/PLC reading. Generally we see the readings mismatch between field & DCS happens...

Difference between DCS & PLC Systems

S Bharadwaj ReddyMarch 16, 2019May 23, 2019

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...

PLC Connection between Instrument, Junction Box, Marshalling & System Cabinet

S Bharadwaj ReddyJanuary 3, 2019May 26, 2019

A PLC connection represents the signal flow starting from the field transmitters, junction box, marshalling cabinet, system cabinet and Human-Machine Interface for the operator graphic display. PLC Connection between Instrument,...

PLC Digital Signals Wiring Techniques

S Bharadwaj ReddyDecember 16, 2018March 21, 2019

Ina process plant, on/off control is done through the PLC or DCS. The below Figure is an overview of one discrete/digital (on/off) circuit, showing the entire process from the power supply...

PLC Analog Signals Wiring Techniques

S Bharadwaj ReddyDecember 16, 2018August 14, 2019

Unlike the discrete/digital (on/off) circuit, analog signals vary across a range of voltage or current. Taking the same vessel described previously in Digital wiring example, how would the wiring change...

What is Distributed Control Systems (DCS) ?

S Bharadwaj ReddyJanuary 22, 2018July 8, 2019

A radically new concept appeared in the world of industrial control in the mid-1970’s: the notion of distributed digital control. Direct digital control during that era suﬀered a substantial problem:...

How to Troubleshoot a PLC System

S Bharadwaj ReddyOctober 8, 2016March 21, 2019

At this post i will give some basic instructions which are from my personal experience in order to give you a guide for how troubleshooting in automation systems (PLC/DCS) is...

PID Controllers with Output High Select Logic

S Bharadwaj ReddyMarch 26, 2016August 25, 2019

The below figure 1 shows a typical control scheme with two controllers driving the same control valve via high select logic. The controller PIC-1 is the main pressure controller and...

Overview of Split Range Control

S Bharadwaj ReddyMarch 26, 2016March 18, 2019

A very common control scheme is split range control in which the output of a controller is split to two or more control valves. Split Range Control For example: Controller...

Blast Furnace Panel Modification to Reduce Down Time by 60 to 70%

S Bharadwaj ReddyFebruary 20, 2016October 4, 2017

With the time demand of increasing the efficiency of production facilities to achieve Target, it is required to made the engineering system robust and fool proof .The below described is...

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Tag : DCS