What are Programmable Logic Controllers?
Programmable logic controllers (PLC) provide a practical way to monitor and control the state of input and output devices. Commonly used in advanced manufacturing and electronic engineering technology, the systems are designed to make logic-based decisions when controlling the devices. These capabilities enhance automated processes in almost any production line or machine function.
PLCs have the ability to replicate and change processes while collecting and delivering crucial information. In addition, the systems are modular. They allow you to deploy different types of output and input devices to suit specific applications.
Programmable logic controllers have the capacity to survive harsh environments. These robust systems can operate in conditions with dust, excessive moisture, high heat or very low temperatures. They can be programmed using a wide variety of PLC languages, including ladder logic, ladder diagram (LD), and function block diagram (FBD).
PLC Operations
The systems work in four basic steps that repeat to form a loop.
- Input scan – this step involves the detection of devices
- Program scan – executes the program logic as determined by the user
- Output scan – this step energizes or de-energize all output devices
- Housekeeping – involves communications with internal diagnostics, programming terminals, and more
Education and Training
Programmable logic controller training covers various topics. The coursework integrates PLC programming with process controls, electronics, and mechanics.
Computer science courses help you prepare for a successful career as a PLC technician. Some of the bachelor's degree programs offered by IT training vendors cover subjects, such as software logic and design, college algebra, code design and debugging, software engineering, design patterns, and more.
Many employers prefer candidates with a PLC technician certificate or related degree. These programs are offered by IT schools through instructor-led or online classes. It is common for schools to use simulation software to complete assignments and PLC lab projects for online programs.
Some of the PLC courses cover different components that make up the systems. They explore differences between small and modular programmable logic controllers. Students familiarize themselves with the functions of timers, switches, counters, and sequencers. When it comes to programming languages, the coursework explores a wide variety of input and output instructions.
PLC training allows you to gain an understanding of operation enhancement techniques. Also, you get an opportunity to review design-based performance predictors. The coursework presents device architectures, algorithm development, simulation, and more.
As a PLC technician, you are expected to comply with a broad range of Federal and state regulations. In addition, you should adhere to a number of industrial and site-specific standards. All processes are run and maintained according to the regulations as well as standards. For this reason, it is vital to stay up-to-date with new technological trends.
Impact of PLCs on manufacturing
Programmable logic controllers are constantly evolving. They provide a viable automation solution for many industrial processes. Manufacturers are taking advantage of the systems to reduce scheduling and cycle time. In addition, firms enjoy programming flexibility and scalability.
To implement the systems properly, manufacturers start by conducting a economical justification analysis. This enables entities to identify key benefits of adopting PLCs.
The controllers are being deployed as a practical solution to many batch processing problems in various industries. The majority of the industrial processes are sequential in nature. They require accurate event or time based logical decisions. PLCs are not just a tool but a total solution. The systems can applied in cement and chemical manufacturing.
Reduced cycle time helps companies realize significant batch process savings. Automation minimizes manual interventions and eliminates human errors. In turn, manufacturers enjoy higher efficiency levels, reduced demand fluctuation, and maximum equipment utilization. Large processing plants use PLC for automatic start up and shutdown of equipment.
The starting process can only be initiated when all the permissive conditions have been established. This ensures safety and proper running of equipment. The system automatically switches off in the event that an abnormality is detected.
The controllers can also be programmed to act as an energy management system for boilers. Doing so enhances both safety and efficiency. When it comes to burners, PLCs can control purging processes, flame safety checks, valve switching for fuel changeover, and pilot light off.
Key Benefits of Programmable Logic Controllers
- Low power consumption
- Good documentation facilities
- Modular assembly simplifies maintenance
- Comes with integrated diagnostic features
- Close loop control programming
- Analog signal handling
- Capable of handling of complex logic operations
Are you excited about the idea of working with programmable logic controllers in your daily job? If you're ready to earn a Bachelors of Science in Electronics Engineering Technology, consider ECPI University for the educational background you'll need to get your start in this high-tech field. Contact a friendly admissions advisor today to learn more about your options.
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