![]() The devices such as pushbutton, sensors are connected as the input devices, which can detect a change in the input signals in the PLC. PLC is lightweight and can operate without any electrical filtering or air conditioning. In simple words, PLC takes the input from the input devices, processes it based on the logic in the CPU, and controls the output devices based on that logic. But, the compact PLCs are used for small scale applications. The Input / Output (I/O) modules in the compact PLC are determined by the manufacturer of that PLC. The slots in the rack PLC communicate with each other connected by the standard network or bus. The racks are placed inside the cabinets. The modules in the rack type PLC are arranged in the rows. Let's have a look at the Modular type PLC. The example includes control processing lines in the manufacturing industry. It also has more memory and capability to store information. We can add more input and outputs by adding the modules in the PLC. It is useful when there are a large number of inputs and outputs. It allows us to expand the structure of PLC. In modular PLC, modular means adding modules. There are three types of PLC, which are shown below: Modular PLC The specific logic is different for each programmer with different techniques of doing the same thing. ![]() The selection of communication medium depends on the manufacturer. These applications communicate with the PLC using the communication medium, such as Ethernet or the proprietary communication bus. Most PLCs are controlled using the applications on the desktop/laptop. It includes calculation in the programming, which is used to calculate different parameters, such as SPC ( Statistical Process Control).īut for its operation, we need to program the Programmable Logic Controller. Hence, PLC is not limited to one building. The I/O modules may be present near or farther away from the CPU. The CPU (Control Processing Unit) communicates with the Input/output. The essential components of PLC are Input/output (I/O) modules, co-processor modules, CPU, and peripheral devices. Hence, to overcome such drawbacks, PLC was created.Ī PLC model has a simple appearance.
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