the method used by the plc to write a ladder logic program is called

The input and output signals and the timer and counter signals are stored in the input and output external image memory respectively. The program information or the control logic is stored in the user memory or the program memory from where the CPU fetches the program instructions.

Memory: The memory is divided into two parts- The data memory and the program memory.

Power Supply: It generally works on a power supply of about 24 V, used to power input and output devices.

It can be a handheld device or a laptop or a computer itself.

Programming Device: It is the platform where the program or the control logic is written.

It carries out all the processing related to the input signals in order to control the output signals based on the control program. It can be a hexagonal or an octal microprocessor.

CPU or Central Processing Unit: It is the brain of the PLC.

The output section or output module can be a motor or a solenoid or a lamp or a heater, whose functioning is controlled by varying the input signals. The input from the sources is connected to the PLC through the input connector rails.

Input/ Output Section: The input section or input module consists of devices like sensors, switches, and many other real-world input sources.

PLC Architecture: PLC Internal ArchitectureĪ basic PLC system consists of the following sections:

Its input and output modules can be extended depending upon the requirements.

It is suitable for automation in industries.

They eliminate the need for hard-wired relay logic.

They are user friendly and easy to operate.

Programming Logic Controller (PLC) Advantages:īefore getting into details about PLCs, lets us know 3 reasons why PLCs are being widely used these days

The method used by the plc to write a ladder logic program is called