Programmable Logic Controllers (PLC)

4 Modules

PLC-1 Fundamentals of Automatic Control

At the end of this module Learners will be able to:

• Identify the 3 basic stages of a typical automatic control system
• Describe the operation of a two state switch and a two state logic
• Explain the operation of a two state relay, and describe the function as a control device
• Explain the basic differences between a relay logic controller and a programmable logic controller

PLC-2 Relay Logic Devices & Ladder Diagrams

At the end of this module Learners will be able to:

• Identify typical symbols in relay ladder logic diagrams
• Identify typical input, logic and output devices
• Describe typical circuit operation from a ladder logic

PLC-3 PLC Hardware & Ladder Logic

At the end of this module Learners will be able to:

• Describe the purpose and function of I/O’s
• Decipher address locations and devices involved in PLC ladder logic diagrams
• Describe how a CPU processes input signals to control the state of outputs
• Explain the basic differences between a relay logic controller and a programmable controller

PLC-4 The PLC as an Information Processor

At the end of this module Learners will be able to:

• Describe how the PLC processes information by a process called SCAN
• Describe the basic operation of the CPU and its memory circuits
• Describe the internal logic devices that exist in the virtual world of the PLC
• Explain the operation of contacts, coils, timers and counters that appear in a typical PLC ladder logic diagram