PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
5th Edition
ISBN: 9781264206216
Author: Petruzella
Publisher: MCG
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Chapter 12, Problem 1RQ
Program Plan Intro
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.
Drum switch:
- Drum switch is also known as sequencer switch.
- The drum switch includes a series of normally open contact blocks which are operated by pegs situated on a motor-driven drum.
Expert Solution & Answer
Explanation of Solution
Operation of a drum switch:
The operation of a drum switch is described as given below.
- In a drum sequencer, the pegs are situated at specific locations around the circumference of the drum for operating the contact blocks.
- When the drum starts rotating, no pegs will remain open and all the contacts that are arranged in a line with the pegs will remain closed.
- Logic 1 or ON is used to indicate the presence of a peg and logic 0 or OFF is used to indicate the absence of a peg.
The
- The ON/OFF operation of 16 discrete outputs is controlled by the drum cylinder.
- The data table given below is used to illustrate the logic state for the first four steps of the drum cylinder.
| 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 |
| 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 0 |
| 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
Here, each location where a peg is present is represented by 1 (ON) and the locations where there are no pegs are represented by 0 (OFF).
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Chapter 12 Solutions
PROGRAMMABLE LOGIC CONTROLLERS (LOOSE PA
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