Lecture Number 3 PLC Scanning.

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Presentation transcript:

Lecture Number 3 PLC Scanning

In this session… In this session, you will learn how the PLC processes information.

Learning outcomes At the end of this session you should be able to: Understand the PLC scanning process Understand how different programming methods are affected by scanning Understand how scanning affects processing speed

Introduction to Programmable Logic Controllers Scanning By Clifford Mayhew

Architecture and Scanning

Architecture and Scanning

Architecture and Scanning Effects on Programming Because the I/O is not scanned during programme execution, an input be activate and then de-activate within one programme scan. This is called a Biphase Error. High speed inputs can be handled using specialised high speed counter modules of interrupt inputs.

Architecture and Scanning Effects on Programming

Architecture and Scanning Effects on Programming

Architecture and Scanning Exercise The execution times for a processor are as follows: Digital I/O 3.5ms Overhead Update 100ms Draw a timing diagram for the program below indicating the maximum time it will take O4 to energise after I1 has been activated. Carry out the same exercise if the rung order is switched. I1 O1 O2 O3 O4

Summary You should now have a good understanding of scanning and its effects on systems and cycle speed.

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