Friday, January 3, 2020

PLC Programming

  • What does ‘PLC’ mean?
A PLC (Programmable Logic Controllers)  is an industrial computer used to monitor inputs, and depending upon their state make decisions based on its program or logic, to control (turn on/off) its outputs to automate a machine or a process.

  • NEMA defines a PROGRAMMABLE LOGIC CONTROLLER as:
“A digitally operating electronic apparatus which uses a programmable memory for the internal storage of instructions by implementing specific functions such as logic sequencing, timing, counting, and arithmetic to control, through digital or analog input/output modules, various types of machines or processes”.
  • Traditional PLC Applications
*In automated system, PLC controller is usually the central part of a process control system.
*To run more complex processes it is possible to connect more PLC controllers to a central computer.
  • Major Types of Industrial Control Systems

  1. PLC 
  2. DCS
  3. Embedded Control 
  4. SCADA

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