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At present,there are more than 200 manufacturers producing PLC in the world.It can be roughly divided into three main genres by region:one genre is Japanese products,represented by Mitsubishi FX series small PLCs;one genre is American products,represented by AB company’s PLC series medium-sized PLCs;and the other is European products,Germany’s Siemens S7 series of large PLC as the representative.Different types of PLC products have different characteristics,not only in special and complex functions,but also in programming languages and program organization.

目前,世界上有200多个厂家生产PLC。大体可以按地域分成主要的三个流派：一个流派是日本产品,以三菱FX系列小型PLC为代表;一个流派是美国产品,以AB公司的PLC系列中型PLC为代表;还有一个流派是欧洲产品,德国西门子的S7系列大型PLC为代表。不同型号的PLC产品具有不同的特色,不仅表现在特殊复杂的功能等方面，就是在编程语言、程序的组织等方面也存在着较大的差异。