For this purpose, the power supply converts the AC voltage (eg 120V) to a lower DC voltage (eg 24V). It supplies the various components of a PLC with DC voltage. It should be noted that according to the physical size, PLC is divided into micro and nano. Transistor output PLC uses the switch function and is used inside the microprocessor. Relay output type is most suitable for AC and DC output devices. According to the output of the PLC module, the PLC outputs are divided into three parts: relay output, transistor output, and triac output. Since each component is independent from other components, it is easier to use. For this reason, it is also called PLC module because components can be added to it. This type of PLC allows for multiple expansions through “modules”. Each input and output is determined by the manufacturer. Therefore, it does not have the ability to expand the module. It has a fixed number of I/O modules and external I/O cards. In a single case, there will be many modules. PLC can be customized according to application and user needs. This is just a simple example of how a PLC can control larger and more complex processes. So by using PLC you can easily combine multiple inputs and outputs. Instead simple code changes are required to program the PLC to turn on the lamp only 30 seconds after the switch is turned on. This is where the PLC comes in without the extra wiring and hardware to ensure changes are made. The only way to achieve this is to completely reroute the circuit to add a timer relay, and making minor changes is problematic. With this hardware setup by wire, we are in trouble. For example, when you turn on the switch, the indicated lamp should turn on after 30 seconds. Usually, the lamp works in two modes, on and off. Imagine you have connected the light bulb to the switch. Let us give an example to better understand this advantage. In a hard-wired control system, you basically have to rip the wires apart and start over (this is more expensive and takes more time). This work is done with a very small cost (only programming time included). Compared to the “hardware by wire” control system, the main advantage of PLC is that you can change its program after programming it and replace the previous program. ![]() PLC has various functions such as timing, counting, calculating, comparing and processing various analog signals. Since then the PLC has completely changed the industry and manufacturing. ![]() Before introducing the various applications of PLC, we will first discuss the history of PLC. In order to overcome this problem, a PLC-based control system was introduced in the industry. In the production process, due to the change in the nature of the process, there may be a need for re-planning. The PLC can be programmed according to the operational needs of the process. ![]() PLC is an integral part of large-scale SCADA system and plays a vital role in automation. The role of PLC in the field of automation: A PLC can be thought of as a “powerful” digital computer that manages electro-mechanical processes in an industrial environment. According to what was mentioned, PLC is more suitable for industrial environments. The biggest difference is that PLC can perform discrete and continuous functions that cannot be performed by computer. ![]() What is Industrial Automation? Difference between PLC and Personal Computer (PC):Ī PLC has many of the functions of a PC you have at home! All of them have a power supply, CPU (central processing unit), input and output (I/O), memory and operating software. PLC is used for the automation of industrial processes such as assembly lines in manufacturing plants, ore processing plants or wastewater treatment plants. working in high temperatures, humidity, dry or dusty conditions). The PLC is specially designed for reliable operation in industrial environments (e.g. PLCstands for “ Programmable Logic Controller” or programmable logic controllers.
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