1, for switching control The hardware structure of the PLC is variable, the software program is programmable, and it is very flexible for control. If necessary, you can write multiple sets or sets of programs and call them as needed. It is very suitable for the needs of multiple working conditions and multi-state transformation in industrial fields. There are many examples of switching control with PLC, metallurgy, machinery, light industry, chemical industry, textiles, etc., which is needed in almost all industrial industries. At present, the first target of the PLC is also unmatched by other controllers, that is, it can be conveniently and reliably used for switching control. 2, for analog control Analog quantities, such as current, voltage, temperature, pressure, etc., are continuously variable in size. Industrial production, especially in continuous production processes, often requires control of these physical quantities. As an industrial control electronic device, if PLC can't control these quantities, it is a big problem. Therefore, various PLC manufacturers have carried out a lot of development in this aspect. At present, not only large and medium-sized machines can perform analog control, but also small machines, and such control can be performed. The PLC performs analog quantity control, and is configured with A/D and D/A units that convert analog and digital quantities. It is also an I/O unit, but a special I/O unit. The A/D unit converts the analog quantity of the external circuit into a digital quantity and then sends it to the PLC. The D/A unit converts the digital quantity of the PLC into an analog quantity and sends it to the external circuit. As a special I/O unit, it still has I/O circuit anti-interference, internal and external circuit isolation, and input and output relays (or internal relays, which is also a zone of PLC working memory, can be read and written) exchange information, etc. Features. The A in the A/D here is mostly current, voltage, and temperature. A in D/A is mostly voltage, or current. The voltage and current range is 0~5V, 0~10V, 4~20mA, and some can handle positive and negative values. Here D, the minicomputer is mostly an 8-bit binary number, and the medium and large are mostly 12-bit binary numbers. A/D, D/A have a single way, but also multiple ways. There are many input and output relays in multiple channels. With the A/D and D/A units, the rest of the processing is digital, which is not difficult for PLCs with information processing capabilities. Medium and large PLCs have stronger processing capabilities, not only for digital addition, subtraction, multiplication, and division, but also for square root, interpolation, and floating point operations. Some PID instructions can also be used to scale the deviation. , differential, integral operations, and then produce the corresponding output, the computer can calculate almost it can be counted. In this way, it is entirely possible to implement analog control with a PLC. The PLC performs analog quantity control, and also has A/D and D/A combined units, and can be controlled by PID or fuzzy control algorithm, which can obtain high control quality. The advantage of using the PLC for analog control is that the amount of switching can be controlled while performing analog control. This advantage is not available in other controllers, or the implementation of control is not as convenient as PLC. Of course, if the system is purely analog, the PLC may not be as good as the regulator in terms of performance and price. 3, for motion control The actual physical quantity, in addition to the amount of switching, analog, and motion control. Such as the displacement of machine parts, often expressed in digital quantities. The effective way to control motion is NC, which is digital control technology. This is a computer-based control technology that was born in the United States in the 1950s. It is very popular today and is also very well developed. At present, the rate of numerical control of metal cutting machine tools in advanced countries has exceeded 40% to 80%, and some even higher. PLC is also based on computer technology and is increasingly perfect. The PLC can receive counting pulses with frequencies up to several k to tens of kHz. It can be received in a variety of ways and can be received in multiple ways. Some PLCs also have a pulse output function, and the pulse frequency can reach several tens of k. With these two functions, plus PLC has data processing and computing power, if equipped with corresponding sensors (such as rotary encoder) or pulse servo The device can completely realize various control according to the principle of NC. High- and mid-range PLCs are also developed with NC units or motion units for point control. The motion unit also implements curve interpolation to control curve motion. Therefore, if the PLC is equipped with such a unit, it is possible to use the NC method to perform digital control. The newly developed motion unit, and even the programming language of NC technology, provides convenience for better digital control with PLC. 4, for data collection With the development of PLC technology, its data storage area is getting bigger and bigger. For example, the data storage area (DM area) of Deweisen PLC can reach 9999 words. Such a large data storage area can store a large amount of data. Data acquisition can use a counter to accumulate the number of pulses collected and periodically transfer them to the DM area. Data acquisition can also be used in the A/D unit. When the analog quantity is converted into a digital quantity, it is transferred to the DM area periodically. The PLC can also be configured with a small printer to periodically print out the data in the DM area. The PLC can also communicate with the computer, and the data of the DM area is read by the computer, and the data is processed by the computer. At this time, the PLC becomes the data terminal of the computer. Power users have used PLC to record the user's power consumption in real time to realize different charging time and different pricing methods. Users are encouraged to use more electricity when using electricity to achieve reasonable power consumption and electricity saving. 5, for signal monitoring There are many PLC self-test signals, and there are many internal devices. Most users do not fully play their roles. In fact, it can be used to monitor the PLC's own work or to monitor the control object. It is very necessary for a complex control system, especially the automatic control system, to monitor and further self-diagnosis. It can reduce system failures, find faults, and improve cumulative mean time-to-failure and reduce faults. Time to improve system reliability. 6, for networking, communication PLC networking and communication capabilities are strong, and new networked structures are constantly being introduced. The PLC can be connected to the personal computer for communication, and the computer can be used to participate in programming and control of the PLC, so that the PLC is more convenient to use. In order to give full play to the role of the computer, a computer can be implemented to control and manage multiple PLCs, up to 32 units. It is also possible to communicate with one or more computers and exchange information to achieve more monitoring of the PLC control system. PLC and PLC can also communicate, one-to-one PLC communication, several PLC communication, can be dozens or hundreds. PLC and smart meters, intelligent actuators (such as inverters), can also communicate online, exchange data, and operate each other. Can be connected to a remote control system with a system range of up to 10 km or more. Can form a local network, not only PLC, but also high-end computers, various smart devices can also enter the network. Available bus networks, or ring networks. The network can also be set. The network and the network can also be bridged. Networking can organize thousands of PLCs, computers, and smart devices in a single network. Nodes between networks can communicate or exchange information directly or indirectly. Networking and communication are adapting to the needs of today's computer integrated manufacturing systems (CIMS) and intelligent factory development. It enables industrial control from point to line to line (Aero), enabling equipment-level control, line control, and plant management control to be integrated into one, creating higher levels Benefits. This infinitely beautiful future has become more and more clearly presented to our generation. The above applications are focused on quality. In terms of quantity, PLC is big and small. Therefore, its control range can also be large or small. Small controls only one device, even one component, one site; large ones can control multiple devices, one production line, and even the entire plant. It can be said that the size of industrial control is inseparable from PLC.
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The ability of the PLC to control the amount of switching is very strong. The number of points of entry and exit controlled is less than ten or ten, and many can reach several hundred, several thousand, or even tens of thousands. Because it can be networked, the number of points is almost unlimited, no matter how many points can be controlled, The logic problems of control can be varied: combined, sequential, instantaneous, delayed, uncounted, countable, fixed order, random working, etc., all can be performed. 
The important role of industrial control devices, do you know these about PLC?
PLC is mainly used for logic control of switching quantities. With the advancement of PLC technology, its application field is expanding. Nowadays, PLC is not only used for digital control, but also for analog and digital control. It can collect and store data, and can also monitor the control system. It can also be connected and communicated to realize wide-area control and management. . PLC has increasingly become an important player in the family of industrial control devices.