Advantages of PLCs Cost effective for controlling complex systems. Flexible and can be reapplied to control other systems quickly and easily. Computational.

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Advantages of PLCs Cost effective for controlling complex systems. Flexible and can be reapplied to control other systems quickly and easily. Computational abilities allow more sophisticated control. Trouble shooting aids make programming easier and reduce downtime. Reliable components make these likely to operate for years before failure. CHAPTER - INTRODUCTION TO PLCS

PLC Origin - Developed to replace relays in the late 1960s - Costs dropped and became popular by 1980s - Now used in many industrial designs

Relays and Schematic Symbols

Logical Control with Relays

Relay Logic In a PLC

Reading Ladder Logic

A Ladder Logic Example

Mnemonics

SFCs

Structured Text

PLC in a Control Loop

The Four Stages of a PLC Scan

Ladder Logic Inputs

Ladder Logic Outputs

Try to develop (without looking at the solution) a relay based controller that will allow three switches in a room to control a single light. Sample Problem: