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0 PrefaceIn the past, the servo drive system was mostly DC system. This is because the DC motor speed regulation is relatively convenient, and its mechanical characteristics are hard. However, the DC motor is not suitable for explosion-proof occasions due to brush reversal, and the structure is complicated and maintenance. inconvenient. In recent years, due to the rapid development of electronic technology, the AC speed regulation technology has become increasingly mature, and its speed regulation performance is comparable to that of the DC system, and it is gradually replacing the DC motor speed regulation.
The original system of our company is independently developed by CANN0N, and the DC servo control system consists of single-chip microcomputer with STD bus and Z80CPU as the core. The system has poor anti-interference ability, unclear hardware and software information, difficult maintenance, expensive spare parts, long procurement cycle, and often cause downtime. Therefore, we used the Siemens S7-300PLC and the position control module FM357, SIM0DRIVE611A servo drive module, 1FK6 servo motor to form the CNC system to transform the original system.
1 System composition and process flow
1.1 System Components <br> System component block diagram shown in Figure 1.
As can be seen from the figure, the robot control system is the core of the entire automobile instrument panel production line. It mainly completes high-precision positioning control, communication with the host computer, data acquisition, fault alarm, and control of the high-pressure cycle and pouring time of the foaming machine. The speed signal of the line is adapted to the different modes of operation of the turntable. The high pressure foaming machine system mainly completes the flow rate, pressure regulation and raw material circulation control of two kinds of foaming materials of ISO (isocyanate) and POL (polyether polyol). The turntable control system mainly completes the turntable speed adjustment and mold opening and closing control.
The robot control system is the focus of this transformation. The main components of the system are shown in Figure 2.
The hardware configuration is as follows:
(1) The upper computer adopts EVOC EWS. The 843P integrated industrial computer is compact and easy to operate. It mainly completes parameter setting and fault display. (2) With Siemens S7.300PLC as the core, the CPU module is CPU316-2DP, which mainly has the functions of communication with the host computer, processing I/O module, control counter module and position control module. (3) The input module is 32 points SM32l, and the output module is l6 point SM322 mainly completes digital I/O control. (4) The FM357 position control module mainly performs high-precision positioning control. (5) The FM350 counting module mainly collects the photoelectric code disc signal from the turntable to complete the coordinated control with the turntable. (6) SIMODRIVE6l1A servo drive module mainly accepts the control signal of FM357 to provide power for servo motor. (7) The 1FK6 AC servo motor is the execution motor.
1.2 System Process Flow <br> The system process flow is shown in Figure 3.
2 system software composition
2.1 System Operation Timing <br> The system operation timing diagram is shown in Figure 4.
2.2 Block diagram and system software <br> The system host computer monitoring software uses Siemens WINCCV5.0 software, which is used to display the casting track and teaching parameter input. The Chinese man-machine interface is easy to operate.
The PLC program of the lower computer adopts Siemens STEP7 V5.1 software to realize program monitoring. The block diagram is shown in Figure 5.
3 Conclusion <br> The AC servo system with Siemens S7-300 PLC as the core replaces the original DC servo system with MCU as the core, which greatly improves the control reliability. The modified system can fully meet the coordinated control of the foaming machine and the turntable, meet the requirements of the injection molding process, and the system has high cost performance, convenient operation and remarkable economic benefits.
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