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PROGRAMMABLE LOGIC CONTROLLER - Coggle Diagram
PROGRAMMABLE LOGIC CONTROLLER
PLC is a device that controls machines and industrial processes
it is an electronic controller
it is designed for industrial environments
MAIN PARTS
Power supply
Provides electricity to the device
CPU
it is an electronic processor
It scans inputs, executes logic operation and updates outputs
It follows ONLY a program
It does it during a cycle called "scan time"
I/O section
connects a physical device to the PLC
Devices can be digital or analogue
PROGRAM SYSTEM
CPU memory stores the program and controls the I/O variables
Programs are created with "Ladder logic"
Using electrical symbols create the program
they represent the logic connection between the components
I/O devices
Digital
Provide a signal (on or off) to CPU or to an external device
Analogue
Convert a voltage or a current into a digital value and vice versa.
The digital value is sent to CPU or any other device