From the 1980s to the mid-1990s,PLC was the fastest growing period,with an annual growth rate of 30-40%.Due to the progress of PLC connection processing simulation capabilities and network functions,it has squeezed a part of the DCS market(process control)and gradually monopolized industries such as sewage treatment.However,due to the emergence of industrial PC(IPC),especially in recent years,fieldbus technology In recent years,the growth rate of PLC has gradually slowed down.At present,there are more than 200 manufacturers around the world producing more than 300 varieties of PLC products,which are mainly used in automobiles(23%),food processing(16.4%),chemical/pharmaceutical(14.6%),metal/mining(11.5%),pulp/paper(11.3%)and other industries.
在80年代至90年代中期,是PLC发展最快的时期,年增长率一直保持为30~40%。由于PLC机联系处理模拟能力和网络方面功能的进步,挤占了一部分DCS的市场(过程控制)并逐渐垄断了污水处理等行业,但是由于工业PC(IPC)的出现,特别是近年来现场总线技术的发展,IPC和FCS也挤占了一部分PLC市场,所以近年来PLC增长速度,总的说是渐缓。目前全世界有200多厂家生产300多品种PLC产品,主要应用在汽车(23%)、粮食加工(16.4%)、化学/制药(14.6%)、金属/矿山(11.5%)、纸浆/造纸(11.3%)等行业。
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