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What is a Programmable Logic Controller (PLC)?

▶ Want to learn industrial automation? Go here: http://realpars.com ▶ Want to train your team in industrial automation? Go here: http://realpars.com/business ▶ You can read the full post here: https://www.realpars.com/blog/what-is... ⌚Timestamps: 00:00 - What is a PLC? 02:23 - Why did PLCs replace relays? 03:18 - Relay Diagram to Ladder Diagram 05:43 - Evolution of PLC technology 07:04 - Skills needed to program a PLC 07:54 - Conclusion The PLC is a computer that has been adapted for industrial use. PLC controllers and components are selected to meet heat and vibration standards set for industrial environments. PLC operating systems also do not have the same overhead as Windows or Apple machines. Regular computers can be configured for PLC-type processing but are not considered reliable for industrial control. The main components between a PLC and a computer are the same. The computer was developed in 1942. Transistors were derived in 1947. The first monolithic chip was made in 1959, by Robert Noyce. The first PLC followed. Dick Morley created the MODICON 084 for General Motors in 1968. MODICON is short for Modular Digital Controller. A PLC has inputs, outputs, and a central processing unit or CPU. The CPU is programmed via an interface that allows a human-created program to be converted into machine language understood by the CPU. This machine language is stored in memory as 1’s and 0’s. The program is downloaded from a computer once it is compiled and has no errors. The PLC will be put into run mode to run the program. The PLC can then use the program to make decisions about the condition of the inputs to turn on or off outputs. This is the basis of the PLC. You should be able to see similarities when comparing the architecture of the PLC and a computer. The two architectures are the same. If you compare the architectures side by side, there are inputs, outputs, power supply, CPU, memory, and buses to interconnect. There is also a user interface for each. The ability to program memory locations in a computer allowed a virtual digital representation of a physical relay. This efficiency led to PLCs being implemented over relay systems. Relay diagrams are like ladder logic in a PLC software development environment. Some of the symbology is different but the outcome is the same. Boolean Logic can represent either the physical relay circuit, or the PLC ladder logic digital representation. Boolean logic is a way of describing a binary format that applies to building a relay system or a program. Once all of the logic is worked out via line drawings or tables or ladder diagrams, then a program can be made and downloaded into the PLC and it becomes an application. This is usually via Ethernet or USB connections. Other advancements that made PLCs possible and advanced industrial communications and signal processing are digital excitation controllers (DEC) and the ability to convert analog to digital and digital to analog at the chip level. Pulse code modulation (PCM) allowed analog signals to be put into a binary form. Control systems engineers, programmers, and technicians need to have mechanical and electrical knowledge. The ability to read schematics and understand processes is also necessary because this must be put into logic for the PLC to achieve the desired states needed to run a process.  Computer programming skills, problem-solving, and attention to detail are required. In addition, hardware and software knowledge related to the control software environments provided by Rockwell, Siemens, Schneider, CODESYS, and the like, is required. ============================= PLC vs PC: https://www.realpars.com/blog/plc-vs-pc An Introduction to Allen-Bradley PLC | Rockwell Automation: https://www.realpars.com/blog/allen-b... PLC Programming Made Easy course series: https://www.realpars.com/courses?*=PL... CODESYS course series: https://www.realpars.com/courses?bran... ============================= Did you miss out on the latest and greatest? Catch up now by watching our videos right here: https://www.realpars.com/blog/esg-man... https://www.realpars.com/blog/what-is... https://www.realpars.com/blog/omron-v... ============================= TWEET THIS VIDEO: https://ctt.ac/9RJ39 ============================= Follow us on Facebook 👉   / therealpars   Follow us on Twitter 👉   / realpars   Follow us on LinkedIn 👉   / realpars   Follow us on Instagram 👉   / realparsdotcom   #RealPars #PLC #programmablelogiccontroller