求翻译：C650普通车床是一种应用极为广泛的金属切削机床，主要用来车削外圆、内圆、端面、螺纹和定型表面等。它采用继电接触器电路实现电气控制，存在线路复杂、故障率高、维护工作量大、可靠性差、灵活性差等缺点。可编程控制器（PLC）专为工业环境应用而设计，其显著的特点之一就是可靠性高，抗干扰能力强。本设计是将C650普通车床电气控制线路改造为PLC控制，可以提高整个电气控制系统的工作性能，减少维护、维修的工作量，并具有良好的扩展性。从而保证了电控系统的快速性、准确性、可靠性，能更好地满足实际生产的需要，提高经济效益。是什么意思？

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The C650 conventional lathe is one kind of application extremely widespread metal-cutting machine tool, mainly uses for the turning outer annulus, the internal bore, the end surface, the thread and the stereotypia surface and so on.It uses continues the electrical pick-off electric circuit realizati

C650 lathe is a very wide range of metal-cutting machine tools, mainly used to turn things round, inner circle, port, threading and shaping surface, and so on. It uses a relay contactor circuit electrical control, there is line complex, high failure rates, poor maintenance of high workload, poor rel