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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…
Introduction Comparison instructions in PLC are used to test pairs of values to condition the logical continuity of a rung. As an example, suppose a LES instruction is presented with two values. If the first value is less than the second, then…
Introduction Sequential function graphics (or SFC) are one of the five PLC programming languages defined by the IEC 61131-3 standard. (The others are ladder logic diagrams, function block diagrams, structured text, and instruction lists.) SFCs are a graphic programming language, not text-based….
Introduction As PLCs have developed and expanded, programming languages have developed with them. Programming languages allow the user to enter a control program into a PLC using an established syntax. Today’s advanced languages have new, more versatile instructions, which initiate control program…
Introduction This is one of the important application of PLC in the bottle filling industry where we want our bottles, which are moving on the conveyor belt, to be automatically detected at the appropriate position and get it filled by any desired…
The Latching relays are designed to keep the relay closed after the coil power has been disconnected. The usual relay logic opens the contact instantaneously after the coil is released. Latching relays are used where it is necessary for contacts to stay…
Introduction The PLC – programmable logic controller – is an industrialised computer designed specifically for industrial control systems.To know more about PLC check the link given below.Now let us discuss about Guidelines for PLC wiring There are two main styles: A small so-called…
This session is the continuation of PLC Interview Questions with Answers Part 1 This session also contains 15 questions.The link to the PLC interview question part 1 is given below https://automationforum.co/2018/06/plc-interview-questions-with-answers-part-1.html 16. Explain P&ID. Ans. P&ID stands for piping and instrumentation diagram. It…
In this session we are gonna discuss about some PLC Interview Questions with Answers and this part contains 15 questions 1. What is Programmable Logic Controllers (PLCs)? Programmable L[ogic Controllers (PLCs) are the micro processor controller devices situated at the remote sites of…
The ladder logic programming is commonly used to program PLCs. A PLC takes input from field devices and based on the programming instructions controls output devices. Writing a program is then equivalent to drawing a switching circuit. The ladder diagram consists of two vertical lines representing…