About this document
Understanding PLC Hardware and Operations by Michael Elliott is a document available to read on EtoBox.
The document discusses the key components and operating cycle of a programmable logic controller (PLC). A PLC has memory areas for storing programs and data and follows a four step operating cycle: input scan to read inputs, program scan to process logic, output scan to control outputs, and housekeeping for communications and diagnostics. The operating cycle continually repeats these steps in a loop.
- Author
- Michael Elliott
- Language
- EN