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Control Systems Theory

DCS versus PLC Architecture

S Bharadwaj Reddy
The main difference between DCS and PLC is the business model which we discussed with comparison of DCS Versus PLC Architecture. DCS versus PLC Architecture The DCS business model can

Difference between DCS, PLC, and RTU ?

S Bharadwaj Reddy
One of the most common questions is regarding the difference between DCS and PLC as well as between PLC and SCADA – and if there is any difference at all

What is Interposing Relay in a PLC System ?

S Bharadwaj Reddy
Interposing Relay is the auxiliary relay which is used to isolate the two different systems / devices. This could be because they have different 0V references, different voltages, AC vs. DC. Interposing

PLC Alarm and Trip Documentation

S Bharadwaj Reddy
A vast amount of documentation is required for the design and construction of a process facility, which are front-end and detailed engineering drawings. The main engineering documents used on a

Basics of Process Control Systems

S Bharadwaj Reddy
The Process Control system may provide steady state or change of state (start-up, shutdown, batch) control functions. The latter may be implemented by automatic sequences or procedurally under manual control.

What is Alarm Management System ?

S Bharadwaj Reddy
The purpose of alarm management system is to alert the operator to relevant abnormal operating situations. They include situations that have a necessary or possible operator response to ensure: Personnel

Process Interlocks and Trips

S Bharadwaj Reddy
Protective tripping systems provide a defence against excursions beyond the safe operating limits by detecting a excursions beyond set points related to the safe operating limits (i.e. the onset of

What is Instrumentation Control System ?

S Bharadwaj Reddy
An instrumentation control system is an electrical, electronic, or programmable electronic system (E/E/PES) which may perform some or all of the following functions: Monitoring, recording and logging of plant status

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