Programmable logic controllers
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Programmable Logic Controllers. Mary Holleboom ENGR 315 Dec. 5, 2001. What is a PLC?. Automates a process, and can withstand an industrial environment CPU – processor, memory, power supply Input – sensors, contacts, buttons, relay switches Output – lights, motors, displays. CPU.

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Programmable Logic Controllers

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Programmable logic controllers

Programmable Logic Controllers

Mary Holleboom

ENGR 315

Dec. 5, 2001


What is a plc

What is a PLC?

  • Automates a process, and can withstand an industrial environment

  • CPU – processor, memory, power supply

  • Input – sensors, contacts, buttons, relay switches

  • Output – lights, motors, displays

CPU

I/O CARDS


Examples

Automotive Industry

Airport luggage transportation

Power plants

Examples


Alternatives

Alternatives

  • Micro PLC

    • Less expensive

    • Smaller

    • Simple instruction set

    • Embedded control

  • Motion Controller

    • Continuous closed-loop control

    • Critical position of load or timing applications

  • PC

    • Sophisticated process control

    • Operator feedback

    • High processor speed

    • Low total system cost

    • Software Reliability


Personal experience

Allen Bradley SLC 5/03 PLC

Interface electronic display with cruise control assembly line

Touch screen display for manual data entry

CPU, I/O

Personal Experience


Future developments

Future Developments

  • Smaller platform - AB CompactLogix 5320

  • Ethernet connections

  • Stand alone - no PC

  • Portable PLC’s

  • PLC’s running schools and large homes


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