Basics of PLCs

Basics of PLCs

1. What is a PLC?

   • Programmable Logic Computer is a special computer that is program to realize a specific task

2. Major Manufacters

   • Allen-Bradley
   • SIEMENS
   • ABB

3. Main Components

   • Inputs
     • You connect sensors here (Pushbutton)
   • Outputs
     • Here you connect field devices (Actuators)
   • Central Processing Unit (CPU)
     • Make decisions and executes control instructions
   • Power Supply
     • Provides the power needed for the functioning of the PLC

4. How to use

   • You must program it
     • Controls different industrial processes or tasks
     • You use a computer, usually is connected to the PLC by ethernet cable

5. Advantages

   • Smaller physical size. Easier and faster to make changes. Integrate diagnostics

6. How it works

   • Converts a physical condition into an electrical signal
     • Controls actuators with buttons or sensors

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