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History of PLC The first PLC was developed by a group of engineers at General Motors in 1968, when the company were looking for an alternative to replace complex relay control systems. What is PLC ? A digital electronic device that uses a programmable memory to store instructions and to implement specific functions such as logic, sequence, timing, counting and arithmetic to control machines and process. There are 5 main LOGIC steps in a scan cycle: Reading inputs Executing the program Processing communication requests Executing CPU diagnostics Writing outputs A basic PLC system consists of the following sections: Input/ Output Section: The input section or input module consists of devices like sensors, switches and many other real world input sources. The input from the sources is connected to the PLC through the input connector rails. 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. CPU or Central Processing Unit: It is the brain of the PLC. It can be a hexagonal or an octal microprocessor. It carries out all the processing related to the input signals in order to control the output signals based on the control program. Programming Device: It is the platform where the program or the control logic is written. It can be a handheld device or a laptop or a computer itself. Power Supply: It generally works on a power supply of about 24 V, used to power input and output devices. Memory: The memory is divided into two parts- The data memory and the program memory. 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. The input and output signals and the timer and counter signals are stored in the input and output external image memory respectively. Follow Us On : Google Reviews : https://goo.gl/LxpEsU Facebook : https://ift.tt/1wSTQ8L Twitter : https://twitter.com/wscube Linkedin : https://ift.tt/2etO7Bm Google + : https://ift.tt/2ePo0lj Youtube : https://www.youtube.com/c/wscubetechjodhpur Website : http://wscubetech.com
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