HPR4718: Programmable Logic Controls - Episode 2

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01 Introduction

This is the second episode in an 8 part series.

02

In the previous episode we discussed the predecessors of PLCs, in particular relay logic.

In this episode we will discuss how relay logic came to be expressed in software rather than in actual hardware components.

03

The topics to be covered include

* Early computers in industry.

* The first PLC.

* PC versus PLC - what's in a name.

* Who the major brands are.