Used in industrial control PLC instead of relay control

A, the disadvantages of current control relay relay today has been applied to the family and industrial control fields. Their products have higher reliability than ever before. However, this is also will bring some problems. Like most control relay are long-term wear and fatigue under the working conditions, easy to damage. And relay contact is easy to produce arc, even will fuse together to produce wrong operation, serious consequences. Moreover, over the use of a concrete containing hundreds of relay device, the control box will be large and bulky. In under the condition of full load transport, large relay will produce a lot of heat and noise, but also consume a lot of electricity. And relay control system must be manual wiring, installation, if there is a simple modification, also need to spend a lot of time and manpower and material resources to restructuring, installation and debugging. Second, advantages, characteristics and function of the programmable controller PLC is famous for its small volume by powerful, it not only can easily complete the order logic, motion control, timing control, counting control, digital computing, data processing, and other functions, and can be established through input/output interface and all kinds of production machinery digital and analog, so as to realize the automatic control of the production process. Especially now, due to the advent of the era of information, network, expanded the function of PLC, make it has a strong network communication ability, which is more widely used in many industries. 1, sequential control, sequence control is the most basic, the most widely used field of PLC. The so-called sequence control, it is in the order process, under the action of control signal, makes the production process of various actuators automatically according to the order. Because it also has a flexible programming design, high speed, high reliability, the advantages of low cost, easy to maintain, so in the realization of single machine control, more machines control, production process control can completely replace the traditional relay contactor control system. It is mainly according to the operation button, limit switches and other site to command signal and sensor signal, control the corresponding mechanical parts for operation, so as to achieve the automatic production line control. Typically used in the automatic control of elevator and the line of electromagnetic logging, open and close automatically, the order of the belt conveyor starting, etc. For example, my factory is the use of raw materials mixing system of PLC sequence control function. 2, closed-loop process control in the past for process control of analog hardware circuit composed of analog PID controller is used to realize the open and closed loop control. Now can adopt PLC control system, choose the analog quantity control module, its function performed by the software, the precision of the system is determined by digits, not affected by the components, higher reliability, easy to realize complex control and advanced control method, can control multiple control circuit and the control parameters at the same time. Such as the temperature, flow rate, pressure and velocity in the process of production, etc. 3, motor position control PLC controller can support nc machine tool control and management, in mechanical processing industry, programmable controller and computer numerical control ( CNC） Together to complete machine motor position control, its function is to accept input device input information processing, the processing and calculation, a corresponding pulse to drive, through the stepper motor or servo motor, make machine tools according to the predetermined orbit, to complete the multiaxial servo motor control. Now used to control the centerless grinding block cutting, stamping, complex components, such as touch hobbing cutting applications. 4, production process monitoring and management of PLC can through the communication interface is connected to a display terminal and printers and other peripherals. Monitor as the man-machine interface ( HMI） Is a kind of embedded microprocessor chip, intelligent equipment, it combined with PLC can replace electric control on numerous control button, selector switch, light signal, and the production process simulation in screen and electric control cabinet plenty of intermediate relay and terminal row. All operations can be on the operation element on the screen. PLC can be conveniently and quickly to production in the process of data acquisition, processing, and to display the parameters in binary, decimal, hexadecimal, ASCII characters for display. On the display screen, through the icon of the color change of the reaction site equipment running status, such as the opening and closing of the valve, the motor start and stop, such as the state of the switch position. PID loop control with comprehensive methods including data and stick figure reflects the process of production, the quantity of operators through parameter setting parameters can be adjusted, through any time data query searchable data records, through print can save related production data, production management and the analysis of the process parameters for the future. More than 5, the network characteristics of PLC can achieve or more between PLC PLC communication between a computer and networking requirements, thus formed multi-stage distributed control system, a factory automation network. ( 1) Through the communication module, PC and the corresponding software to achieve remote monitoring of control system. ( 2) By modem and public telephone network to connect to the remote client computer so that managers can through telephone lines for remote monitoring control system.
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