plc Archives | Instrumentation and Control Engineering

Checklist to Carry out PLC Preventive Maintenance Activity

A preventive maintenance checklist is a group of tasks that the technician must complete to close a preventive maintenance work order. The purpose of a preventive maintenance checklist is to confirm for maintenance tasks are correctly done. The maintenance schedule of Programmable Logic Controllers depends upon the environment of the controllers. Frequent maintenance of the …

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What is Interposing Relay? & How it is used in PLC?

PLC

What is Interposing Relay (IPR)? Interposing Relay is the auxiliary relay for isolating the two different systems or two different devices because these devices may have different Zero Voltage references. These two devices may be a Programmable Logic Controller and Contactor. The main purpose of interposing relay is to minimize the load on the controller …

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Basics of Piping and Instrumentation Diagrams (P&IDs)

P&ID

The term P&ID stands for Piping and Instrumentation Diagram or Drawing. In other words it is also called a process and instrumentation diagram or simply a P&I diagram or drawing. P&IDs are commonly called engineering flow drawings or mechanical flow diagrams. These P&IDs are most used in the process industries to show the process flow …

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What is the difference between PLC and PID controller?

PLC

What is PLC? A PLC, also known as a programmable logic controller, is merely a unique computer device used for industrial control systems. They are utilised in a variety of sectors, including conveyor systems, production lines, and oil refineries. The PLC offers a versatile technique to “software” the components together wherever there is a requirement …

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What are the types of PLC?

PLC

PLC: A PLC, or programmable logic controller, is a rugged computer used in industrial automation. These controllers have the ability to automate a particular procedure, a machine feature, or even an entire manufacturing line. How does a PLC function? The PLC collects data from attached sensors or input devices, processes the information, and then initiates …

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Comparison between PLC, DCS, and SCADA

Automation, Control System, DCS, PLC

What is a PLC control system and how does it operate? The Programmable logic controller is a digitally operated device that has a programmable memory for storing the instructions and also to do, the specified functions. A PLC would do logic, arithmetic, timing, counting, and sequencing functions to control various machines in an industrial process. …

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Siemens PLC System Overview

PLC

Introduction SIMATIC is a series of programmable logic controllers and automation systems developed by Siemens introduced in 1958 the series has gone through four major generations. The latest beginning with the SIMATIC S7 generation. It is purely for industrial automation, process industry, and production. What are the various types of PLC? LOGO SIMATIC S7- 200 …

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Leading PLC manufacturers

PLC

A PLC can be described as an industrial computer and a PLC is composed of hardware and software and also a set of instructions to do the control functions. By using a PLC, we can control a machine or a process in an industry, the industrial process and machinery will be sequential. This sequential process …

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Simple motor operation using PLC

PLC

PLC Ladder motor Problem: Controlling the running state of the 1 ph motor by PLC ; pressing START and STOP pushbuttons i.e. motor should remain in ON state after START pushbutton is pressed and should OFF when STOP pushbutton is pressed. Checking if the Motor is running normally by pressing TEST pushbutton. Number of PLC …

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Data Handling Instructions for PLC

PLC

Introduction This session contains general information about the data handling instructions for plc and explains how they function in your application program. Convert to BCD (TOD) Use this instruction to convert 16-bit integers into BCD values. If the integer value you enter is negative, the absolute value of the number is used for conversion. …

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