PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
5th Edition
ISBN: 9781260017502
Author: Petruzella
Publisher: MCG
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Chapter 12, Problem 3RQ
Program Plan Intro
Programmable Logic Controller (PLC):
- Programmable Logic Controller (PLC) is a specialized computer used in industrial segments to control machines and process.
- PLC is program that consists of a set of instructions which resembles the controlling functions needed to perform specific tasks.
- The function of PLC is similar to that of a relay and hence, in an industrial segment a relay is greatly replaced by a suitable PLC.
- When compared to general Personal Computer (PC), a PLC is available in small and tiny sizes.
- The basic architecture of a PLC consists of an input-output interface module and a small Central Processing Unit (CPU) that runs by controlling
programming language.
Sequencers:
- Programmable Logic Controller (PLC) sequencer performs ON or OFF output patterns using sequencer instructions.
- The sequencer output instruction is used for controlling the output devices.
- PLC sequencer instructions are used for controlling machines which provides a stepped sequence of repeatable operations.
- It simplifies the ladder program by allowing the user to use a single or pair of instructions for performing complex operations.
- Various sequencer instructions can be programmed based on the PLC manufacturer.
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Chapter 12 Solutions
PROGRAMMABLE LOGIC CONTROLLERS-PACKAGE
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- Differentiate the two types of instruction in PLC.arrow_forwardConstruct a basic stop/start seal-in circuit. Energize an internal relay to seal-in (latch) the circuit. write the circuit in both Ladder Logic and Function Block Diagram (FBD). Hardware setup: Input 1 - Normally closed stop pushbutton, Input 2 - Normally open start pushbutton. Output 1 - A Red light to indicate the circuit is not energized. Output 2 - A Green light to indicate the circuit is energized. Label all inputs and outputs in the plc program. Write the program in both ladder and function block diagram (FBD).arrow_forwardExplain the difference between the asynchronous counter and the synchronous counter.arrow_forward
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