A dedicated PLC is a microprocessor controlled computer that is designed specifically to perform real-time industrial machine control.
There are 3 general sections to all PLC’s, INPUT, CONTROLLER, and OUTPUT.
There are 3 general sections to all PLC’s, INPUT, CONTROLLER, and OUTPUT.
INPUT – The input section consists of integrated inputs, or extension inputs that machine input devices will be wired to, like limit
switches, or transistor sensors. When the input voltage reaches its specified level the input becomes active. Once active, the input can be read by controller.
CONTROLLER – The controller is the main unit. Several CPU modules are available depending on the demands of your application.
OUTPUTS – The third section is the outputs. Based on the condition of the inputs, the controller will judge which outputs should turn on, to activate machine devices like lights, buzzers, relays, solenoids, or motors.
switches, or transistor sensors. When the input voltage reaches its specified level the input becomes active. Once active, the input can be read by controller.
CONTROLLER – The controller is the main unit. Several CPU modules are available depending on the demands of your application.
OUTPUTS – The third section is the outputs. Based on the condition of the inputs, the controller will judge which outputs should turn on, to activate machine devices like lights, buzzers, relays, solenoids, or motors.
The 3 sections are controlled by custom sequencing software called ladder programming, which takes the place of hardwired circuits. The relationship between inputs and outputs is controlled by the logic in your ladder program. Because hard-wired circuits are now replaced by software logic, machine modifications and improvements, are much easier to complete.
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