Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 5, Problem 4RQ
Program Plan Intro

Data Files:

  • Data files include information needed to carry out user program such as timer and counter values, data storage, status of input and output devices, etc.
  • Contents of data table can be divided into two categories such as status data and numbers or codes.
  • The status data can be of either ON/OFF type and are stored in unique bit locations.
  • Similarly, the numbers or codes can be represented by groups of bits that are stored in unique byte or word locations.

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