Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
Question
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Chapter 14, Problem 35RQ
Program Plan Intro

Access method:

  • The bus topology network needs some controlling techniques for access of particular devices to the bus.
  • For transmitting information, a Programmable Logic Controller (PLC) will access the network by using access method.
  • The most common access methods include token passing, collision detection, and polling.

DH+:

  • The Allen-Bradley Data highway networks mainly have two communication network products such as Data Highway plus (DH+) and DH-485.
  • DH+ makes use of peer-to-peer network in which a data communication system is formed by integrating programmable controllers and computers together.
  • DH+ refers to a local area network that is used for factory-floor applications.

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Chapter 14 Solutions

Programmable Logic Controllers