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Programmable Logic Controllers (PLCs) have existed for more than 50 years now and have set up themselves as the favored hardware for industrial automation. A number of competitors have traveled the path in the form of PCs, micro-controllers etc. However, none have possessed the capacity to dent PLC’s reputation. History: The first ever PLC entered into the industrial environment in the 1960s and happened to be a variant of the widely utilized programmable controller. The requirement for reliable and adaptable control over relays in a space-canny way set off the development of PLCs. Not before long, PLCs took over Programmable Controllers, as they permitted reprogramming and re-usability as a part of the ladder logic. PLCs come in different sizes, and for the most part occupy lesser space contrasted with rest of the industrial equipment. The PLC chassis could be open or shut, contingent upon the hardware specifications while every single electronic component is either mounted on PCBs or DIN rails. Functionality: Programmable Logic Controllers function on the processing principle of scanning cycles. The methodology has stayed virtually unchanged for all PLCs. As special peripherals or hardware is included, the necessity for scanning cycles increases. Here’s an approach to comprehend the scanning cycles. Initially, the software scans the I/O hardware modules, post power-up. The data contents are exchanged to the input’s image table while the data from the output table is sent to the output module. The software program is eventually scanned, and processed as per the code. Outputs get reflected in the output table, post processing, and the related peripheral gadget (normally relay) is empowered. The extent of a PLC relies upon its I/O ability. The number of I/O points necessary are contrived by the System Engineer, contingent upon the load necessities. When the control machinery increases, additional I/O points would be needed which can be offered through expansion cards. Sections of PLC: All PLCs comprise of four sections, each of them can be further divided into subsections. Power Supply Section CPU Module Processor section Memory section Program Software Section I/O Section Those were the basics of PLC which you need to know, when you get started with it. Once you get well acquainted with them, you can move on and go for the advanced concepts of the same.
Hi to everyone, i'm a junior programmer. My boss told me that i have to study a new plc: BeckHoff. I ask you if somewhere there is a guide about this plc, and about ST language used in this plc. I tried to use the help function on TwinCAT 2, but it doesn't explain lot of things. Before that, i used to program with ladder language, so i don't know nothing about ST. I hope in one of your help.
I have restored a crashed IFIX to a new PC. The restore is ok and installed GE9 driver. With the GE9 power tools, we can observed that data transmits and recieve. The problem is that the screen scada is not updating i.e. no status/feedback, anything is happening. The LAN network TCP/IP was configured i.e. IP, subnet and gateway. Any remedies/advice is most welcome. Please provide a guide on the communication/configuration setup. Thanks