1 前言用编程控制器(下称PC)自1 969年出现以来迅速得到普及推广,到二十世纪七十年代中期,对PC的标准化、规格化要求迫切起来。为满足这种要求,IEC/TC65在1 979年10月召开的会议上决定设立WG6,负责制订和审议有关可编程控制器系统的标准化文件。WG6的第一次会议是在1980年12月举行的。此后,截止到1986年3月,WG6在欧州各地共举行了14次会议。经上述会议的充分研究和讨论,结果归纳成由七部分组成 1 Introduction The use of Programmable Controllers (PC) has rapidly gained popularity since its appearance in 1969. By the mid-1970s, the standardization and normalization of PCs was imperative. To meet this requirement, IEC / TC65 decided at the meeting held in October 1979 to establish WG6, which will be responsible for developing and reviewing the standardization of programmable logic controller systems. The first meeting of WG6 was held in December 1980. Since then, as of March 1986, WG6 held 14 meetings across Europe. After full discussion and discussion at the above meeting, the results are summarized into seven parts