1, high reliability, anti-interference ability
High reliability is the key performance of electrical control equipment. PLC due to the use of modern large-scale integrated circuits
Integrated circuit is the use of semiconductor manufacturing process, in a smaller single-crystal silicon on the production of many transistors and resistors, capacitors and other components, and in accordance with the method of multi-layer wiring or tunnel wiring components into a complete electronic Circuit. It is in the circuit with the letters "IC" (also useful text symbol "N", etc.) said.
Technology, using strict manufacturing process, the internal circuit to take advanced anti-jamming technology, with high reliability. The use of PLC control system, and the same size relay contactors
Contactor is a widely used switch electrical appliances. Contactor is mainly used for frequent connection or disconnection, DC main circuit and high-capacity control circuit, remote operation, with the relay can be achieved timing operation, interlock control and a variety of quantitative control and under-voltage and under-voltage protection, Widely used in automatic control circuit, the main control object is the motor, can also be used to control other electrical loads, such as electric heaters, lighting , welding machine, capacitor bank. [full text]
Compared to the system, electrical wiring and switch contacts have been reduced to hundreds or even a few thousandths, the fault will be greatly reduced. In addition, PLC with hardware fault self-detection function, in the event of failure can be timely warning message. In the application software, the user can also be programmed into the peripheral device fault self-diagnosis program, so that the system in addition to PLC circuits and equipment also received fault self-diagnosis protection. In this way, the reliability of the entire system is extremely high.
2, complete, fully functional, adaptable
Today, PLC has formed a series of products of all sizes, can be used for industrial control of all sizes. In addition to logic processing functions, most of PLC has a complete data computing capabilities, can be used in a variety of digital control areas. The proliferation of a large variety of functional units, so that PLC penetration into the position control, temperature control, CNC and other industrial control. Coupled with the enhanced PLC communication capabilities and the development of man-machine interface technology, the use of PLC to form a variety of control systems has become very easy.
3, easy to learn and easy to use, well received by engineering and technical personnel
PLC is industrial equipment for industrial and mining enterprises. Its interface is easy, the programming language is easy to accept for the engineer. The graphical notation of a ladder diagram language is quite close to that of a relay circuit diagram and opens the door to industrial control of people who are unfamiliar with electronic circuitry and do not understand computer principles and assembly language.
4, the system design workload is small, easy maintenance, easy to transform
(1) Design and maintenance
PLC replaces the wiring logic with storage logic, greatly reducing external wiring to the control equipment, greatly reducing the cycle time required to design and build control systems, and facilitating routine maintenance, and more importantly, changing the same equipment through program changes The production process is possible. Particularly suitable for more varieties, small quantities of production occasions.
(2) installation and wiring
Power lines, control lines and PLC power cord
Power cord is used as an electrical component or equipment and power cable, usually refers to the end of the cable connected to the plug or tail assembly, is one of the basic components of electrical products. Power cord is divided into two parts and wires.
And I / O lines should be separately wired, isolated transformers and PLC and I / O should be twisted pair connection. Separate the I / O lines of the PLC from the high-power lines. For example, the AC lines and the DC lines must be bundled separately in the same slot. If the conditions permit, the best alignment of the slots will not only make it possible Large spatial distance, and interference can be minimized.
PLC should be far away from strong interference sources such as welding machine, high-power silicon rectifier and large power equipment, can not be installed in the same switchgear with high-voltage electrical appliances. PLC in the cabinet should be away from the power line (the distance between the two should be greater than 200mm). Inductive loads installed in the same cabinet as the PLC, such as larger power relays, contactor coils, should be connected in parallel RC arc suppression circuit.
PLC's input and output is best to use separate wiring, switch and analog also have to be laid separately. Transmission of analog signals should be shielded cable, the shield should be grounded at one or both ends, grounding resistance
Resistance, material obstruction of the current is called the resistance of the material. Small resistance called electrical conductors, referred to as the conductor. Large resistance material called electrical insulator, referred to as the insulator. Should be less than 1/10 of the shield resistance.
Do not use the same cable for the AC output line and the DC output line
Cables are a type of wire product that transmits electrical energy information and converts electromagnetic energy. Both conductors and insulation, and sometimes also to prevent moisture intrusion within the strict protective layer, or also add mechanical strength of the outer sheath, the structure is more complex, larger cross-sectional area called cable products.
Output lines should be kept away from the high-voltage lines and power lines, to avoid parallelism.
(3) I / O terminal wiring
Input wiring: input wiring generally do not be too long. However, if the environmental interference is small, the voltage drop is not large, the input wiring may be longer; input / output lines can not use the same cable, input / output lines to be separated; as far as possible the use of normally open contacts connected to the input, The preparation of the relay diagram and the same ladder diagram, easy to read.
Output connection: The output terminal is divided into independent output and public output. In different groups, different classes may be used
Matting Agent For Coil Coatings
Description
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Strengths
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