求翻译：　　早期的可编程控制器称作可编程逻辑控制器(Programmable Logic Controller,PLC)，它主要用来代替继电器实现逻辑控制。随着技术的发展，这种采用微型计算机技术的工业控制装置的功能已经大大超过了逻辑控制的范围，因此，今天这种装置称作可编程控制器，简称PC。但是为了避免与个人计算机(Personal Computer)的简称混淆，所以将可编程序控制器简称PLC,plc自1969年美国数据设备公司（DEC）研制出现，现行美国，日本，德国的可编程序控制器质量优良，功能强大。是什么意思？

Early programmable logic controller programmable controller is called (Programmable Logic Controller, PLC), which is mainly used to replace relay logic control. As technology advances, the use of micro-computer technology, industrial control devices feature a logic control has been much higher than

　　Early programmable logic controller referred to as programmable logic controllers (Programmable Logic Controller,PLC), it is mainly used to replace relay logic control. With the development of technology, which adopts microco