At present, plc has been widely used in various industries such as steel, petroleum, chemical, electric power, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and culture and entertainment. In Yuncheng Power Plant, there are mainly chemical water, domestic sewage treatment, industrial wastewater treatment, and condensed water treatment. The use of PLC is mainly divided into the following categories.
1. Switching logic control
It replaces the traditional relay circuit to realize logic control and sequence control. It can be used for single device control or multi-machine group control. Such as the start and stop of the pump, the switch of the valve, the control system of the water system, the dry ash removal system, etc.
2. Industrial Process Control
In the industrial production process, there are some continuous changes such as temperature, pressure, flow, liquid level and speed (ie analog quantity), PLC adopts corresponding A/D and D/A conversion modules and various controls. The algorithm program processes the analog quantity and completes the closed loop control. PID regulation is an adjustment method used in general closed-loop control systems. Process control has a wide range of applications in metallurgy, chemical and other occasions. Yuncheng Power Plant is mainly used in central air conditioning and heating and heating systems.
3. Motion control
The PLC can be used for the control of circular motion or linear motion. Special motion control modules are generally used, such as single-axis or multi-axis position control modules that can drive stepper motors or servo motors, and are widely used in various machines, machine tools, robots, elevators, etc.
4. Data processing
PLC has mathematical operations (including matrix operations, function operations, logic operations), data transfer, data conversion, sorting, table lookup and other functions, can complete the data collection, analysis and processing.
5. Communication and networking
PLC communication includes communication between PLCs and communication between PLCs and other intelligent devices. With the development of the factory automation network, the current PLC has a communication interface, and communication is very convenient.
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