1 Introduction Chemical fiber production is a long-term continuous production. Generally, it requires continuous operation for more than 8000h within one year, that is, the reliability of the operation of chemical fiber equipment is higher than that of general textile machinery and equipment. Chemical fibers are generally divided into two categories: man-made fibers and synthetic fibers. China's chemical fiber is mainly composed of synthetic fibers, and synthetic fibers are mainly developed with polyester fibers. Its production scale is getting larger and larger. The production equipment for polyester staple fibers with an annual output of 30,000 to 100,000 tons has matured. This article takes the production equipment of polyester staple fiber with an annual output of 30,000 tons as an example. Polyester staple fiber production equipment includes textile combined machine and post-processing combined machine. Textile combined machines include spinning machines (mainly spinning boxes, spinning components, spinning pumps, metering pumps, cooling blowers and oiling, biphenyl heating, etc.), winding machines (mainly oiling, traction machines, Feeding machine, etc.) and reciprocating device of wire barrel (mainly including barrel conveying, trolley, longitudinal and lateral movement devices, tow out piercing conveying device, etc.). Post-processing combined machine includes bundle frame, wire guide, oil dipping tank, one drafting machine, water bath, two drafting machine, steam heating tube, tension heat setting machine, cooling spray machine, three traction machine, stacked wire Machine, three-roller traction machine, tension frame, steam preheating tank, crimping machine, wire laying machine, conveyor, relaxation heat setting machine, traction tension frame, traction machine, cutting machine and baler etc. 2 control system The block diagram of the control system of the polyester staple fiber production equipment is shown in Figure 1. The system uses an industrial computer as the host computer and PLC as the control core of each subsystem. The PLC of each sub-system communicates with each inverter, servo controller, field I / O, etc. through a field bus (Profibus-DP) to form a field bus control system, and the PLC of each sub-system passes through the operator station and the engineer station Industrial Ethernet (IndustrialEthernet) communicates, realizes workshop-level and plant-level information management and control, and provides real-time data. Provided conditions for the integration of management and control. 2.1 Spinning combined machine control The main technical features of spinning combined machine: Daily output: 100t / d; Spinning digits: 32 or 36 bits; Mechanical speed: 500 ～ 1500m / min; Longitudinal speed of wire barrel: 5 ～ 10m / min; Lateral speed of wire barrel: 0.5 ～ 3.5m / min; The total power of the whole machine is 460kW (including transmission power of 160kW and combined heating of 300kW). The block diagram of the control system is shown in Figure 1. The control system includes an engineer station, an operator station, spinning control, winding feed control, and silk barrel reciprocating control substation. The operator station completes the display of the production process screen, and can set, modify, record, query, and print process parameters and PID adjustment parameters, as well as the recording, query, and printing of alarm information. In addition to the main functions of the operator station, the engineer station also has the functions of programming, configuration, debugging, and modification of multiple production lines (such as spinning and post-processing combined machines), as well as fault diagnosis functions. Both the operator station and the engineer station are implemented by industrial computers. The man-machine interface uses a touch screen, which can conveniently set spinning process parameters, operation control, working condition display, fault alarm display, data records and query records on the touch screen. (1) The block diagram of the spinning machine control system is shown in Figure 2. Spinning PLC (1PLC) controls the speed of 32 spinning pumps and the frequency conversion of one oil pump, and monitors the temperature and pressure of 4 spinning boxes. The system is equipped with 4 on-site I / Os, which are realized through a human-machine interface The setting and modification of process parameters, the collection of relevant data, and the control of the operation of the above equipment. (2) The block diagram of the winding and feeding control system is shown in Figure 3. The winding PLC (2PLC) outputs 1 to 6 traction rollers, godet rollers, feeding wheels, and oil pump (wheel) motor speed control. Control the spinning and blowing device, equipped with 5 on-site I / O, complete the setting, modification and data collection of process parameters through the touch screen. When pulling the tow, each roller between the traction roller 1 and the traction roller 6 may generate a power generation operation state, that is, a backward drag phenomenon, which will cause an unstable traction ratio. To this end, the common DC bus power supply method is adopted, and a total of 6 inverters of 1 to 6 traction rollers are powered by one rectifier unit, which can ensure that the feedback energy generated by the motor in the power generation operation is consumed in the motor in the electric state. In this way, the negative power energy can be automatically balanced through the DC bus. In addition, the DC voltage of each inverter terminal is connected in parallel, and the capacity of the filter capacitor is increased. Therefore, the voltage of the DC bus does not increase, and the stability of the draft ratio is guaranteed. (3) The control system of the reciprocating device of the silk drum is shown in Figure 4. The reciprocating PLC of the silk drum (3PLC) controls the precise transmission of the longitudinal and horizontal servo motors of the reciprocating device of the silk drum, and the related parameters are set, modified and The collection is also provided with a fixed-length device to accurately determine the length of each barrel of silk, so as to minimize the waste of tail silk in each silk barrel. The direct spinning spinning combined machine should also include a melt piping booster pump PLC station (4PLC). The PLC station mainly controls the temperature and melt pressure of the melt piping. The booster pump is driven by an AC asynchronous motor and uses vector control. -Type frequency converter accurately adjusts the speed and regulates the melt pressure in the piping. 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