Over the years programmable controllers (hereinafter referred to as PLC) from its generation to the present, to achieve the wiring logic to store the logic of the leap; its function from weak to strong, to achieve the logic control to the progress of the digital control; its field of application from small to large, to achieve the simple control of a single unit of equipment to the competent motion control, process control and distributed control of a variety of tasks such as the leap. Today's PLC in the processing of analogue, digital computing, human-machine interface and network capabilities have been greatly improved in all aspects, becoming the mainstream control equipment in the field of industrial control, in all walks of life play an increasingly large role.
1 PLC application areas
At present, PLC has been widely used at home and abroad in various industries such as iron and steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automotive, textile, transport, environmental protection and culture and entertainment. In Yuncheng power plant is mainly chemical water production, domestic sewage treatment, industrial wastewater treatment, condensate fine treatment and so on. The use of PLC is mainly divided into the following categories.
1.1 Switching logic control
Replace the traditional relay circuit to achieve logic control, sequence control, can be used for both single equipment control, can also be used for multi-machine group control. Such as the start and stop of pumps, valve switching, water production system control, dry ash removal system.
1.2 Industrial process control
In the industrial production process, there are a number of such as temperature, pressure, flow, level and speed and other continuously changing quantities (i.e., analogue), PLC using the corresponding A/D and D / A converter module and a variety of control algorithms to deal with analogue quantities to complete the closed-loop control. pid regulation is a general closed-loop control system is used more of a regulation method. Process control in metallurgy, chemical industry and other occasions have a very wide range of applications, Yuncheng Power Plant is mainly used in the central air conditioning, heating and heating systems.
1.3 Motion Control
PLC can be used for circular motion or linear motion control. Generally, special motion control modules are used, such as single-axis or multi-axis position control modules that can drive stepper motors or servo motors, which are widely used in various machinery, machine tools, robots, lifts and other occasions.
1.4 Data processing
PLC has mathematical operations (including matrix operations, function operations, logical operations), data transfer, data conversion, sorting, table checking and other functions, can complete the data acquisition, analysis and processing.
1.5 Communication and networking
PLC communication contains PLC communication and PLC communication with other intelligent devices. With the development of factory automation network, now the PLC has a communication interface, communication is very convenient.
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