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

S Bharadwaj Reddy
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,

What is SCADA ? How does SCADA Works ?

S Bharadwaj Reddy
SCADA stands for Supervisory Control and Data Acquisition but it is a term often used for data collection and presentation. What is SCADA ? SCADA is normally a software package

PLC Digital Signals Wiring Techniques

S Bharadwaj Reddy
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 Reddy
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

How a PLC Reads the Data from Field Transmitters

S Bharadwaj Reddy
Instrumentation and control rely on converting physical or process variables into a more useful format for the operator display. Pressure in a pipe is converted to mechanical deflection of a

Contacts and Coils in PLC Ladder Logic

S Bharadwaj Reddy
The most elementary objects in Ladder Diagram programming are contacts and coils, intended to mimic the contacts and coils of electromechanical relays. Contacts and coils are discrete programming elements, dealing

History of Programmable Logic Controllers (PLC)

S Bharadwaj Reddy
Every control system may be divided into three general sections: input devices (sensors), controllers, and output devices (actuators). The input devices sense what is happening in the process, the controller

Basics of PLC Programming

S Bharadwaj Reddy
In the late 1960’s an American company named Bedford Associates released a computing device they called the MODICON. As an acronym, it meant Modular Digital Controller, and later became the

Normally-Closed Contacts for Stop Buttons

S Bharadwaj Reddy
You may know the difference between normally open and normally closed contacts, but do you know where to use them? This article will teach you where to use normally open

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