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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

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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