What is PLC
PLC integrates computer technology, automatic control technology and communication technology, adopts user-oriented "natural language" programming to control, adapts to industrial environment and is simple and easy to understand, easy to operate and highly reliable industrial control equipment. PLC is a general-purpose automatic control device with a microprocessor as the core, which is developed based on the sequential control of relays.
Technicians will say: PLC is an advanced control technology.
Sales staff will say: PLC is money and market, they can directly sell PLC without understanding PLC technology.
The boss of the automatic control company will say: PLC is a profitable industrial control product.
In fact, PLC is time.
The emergence of PLC has shortened the production cycle of automobile production lines from the original production cycle of 6-9 months to 6-9 weeks, and the same is true of steel, petrochemical and other production, because the establishment of the automatic control system has greatly shortened the production cycle and production volume. What does the time saved mean for the business? That is profit. Wireless PLC is more time efficient.
PLC product itself does not create any value, it needs to be carefully crafted by engineers before it can be used in production to show its strong value capability. It is the value created by PLC that can save time that makes PLC mature and widely used in various industries from FA to PA due to its stability, low cost and wider functional extensibility.
Basic functions of PLC
Logic control function, timing control function, counting control function, step control function, data processing function, loop control function, communication networking function, monitoring function, power failure memory function, fault diagnosis function.
The difference between single chip microcomputer and PLC
In essence, PLC is actually a set of single-chip microcomputer system that has been done. also:
1. PLC is a relatively mature control system composed of single-chip microcomputers. It is a mature and stable single-chip application system product that has been debugged. Has a strong versatility.
2. Microcontrollers can form various application systems and are more widely used. As far as a "MCU" is concerned, it is just an integrated circuit that must be combined with other components and software to form a system.
3. From the perspective of project usage, it is quick and convenient to use PLC for a single project or several projects with fewer repetitions. High success rate and good reliability, but high cost.
4. For large-scale supporting projects, the use of single-chip microcomputer system has the advantages of low cost and high efficiency, but it must have considerable research and development strength and industry experience to make the system stable.
What do I need to learn to get started with PLC zero-based self-study?
First of all, it is necessary to understand electrical knowledge, understand how to control electrical appliances, understand various actuators, and then understand the working method of PLC, input and output circuits, and finally understand the corresponding process.
1. To learn PLC, you must first choose which manufacturer's PLC to learn. The internal software of Japanese PLC is highly integrated and easy to apply. In the early days, OMRON and Mitsubishi used more applications. Now, because of trade and international cooperation, Siemens PLC and Rockwell are used more.
2. PLC is not a single programming technology, it is a system professional course. PLC can be broadly considered as a highly reliable PC with embedded operating system. First of all, it is necessary to deepen the programming language ladder diagram of PLC itself. At this level, you can only read and understand the programmed programs, and can design some engineering programs. In this industry, it is also necessary to apply VB and VC++ to realize serial communication and distributed control system. Database knowledge is also required in some large programs.
3.PLC is a discipline that focuses on application direction. So take a little more practice. For example, every time you go to the site to debug, call the program on the site to view it, and learn about the structure of the program and the difference and characteristics with other programs.
Recommended reading books for PLC zero-based self-study introduction: "PLC Programming Theory, Algorithms and Skills (Second Edition)", "PLC Programming and Troubleshooting", "Mitsubishi PLC Programming Quick Learning and Quick Application", "Siemens S7-200 Series PLC" Programming Instructions and Ladder Diagram Quick Start", "PLC Programming of CNC Machine Tools".
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