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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,...

How 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...

PLC Valve Control Ladder Logic Programming

S Bharadwaj Reddy
Objective : To understand the basic concept of PLC Valve Control Ladder Logic. Target Users : Students, Technicians, Freshers, Trainee engineers. Note : Barrier or Relay not shown in above...

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...

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...

PLC Program for Control Valve Scaling

S Bharadwaj Reddy
Control Valve Scaling This is PLC Program to implement analog scaling in S7-300 PLC. Problem Description Implement PLC program in S7-300 for analog scaling. Problem Diagram Problem Solution Analog inputs...

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