一个或若干plc与pc机联出系统,pc机起到原编程器及人机界面操作站的作用,这20世纪90年代的新潮流,这样为系统集成带来了商机,同时编程软件和人机界面软件(监控软件或称组态软件)及软件接口(或称驱动软件)也得到了发展。
近年来,plc厂家在原来cpu模板上提供物理层rs232/422/485接口的基础,逐渐增加了各种通讯接口,而且提供完整的通讯网络。由于近来数据通讯技术发展很快,用户对开放性要求很强烈,现场总线技术及以太网技术也同步发展,所以plc构成的pcs系统比dcs的开放性所处的现状稍好一些。plc的应用领域是宽阔的,还有许多领域急待开拓,如用于海关过境车辆认证(深圳盐田)、自动售药小(若干中药店)在我国已有实例。另外,在离散事件冬天系统中,如公路网交通流(车辆计数、乘客计数及停留时间计量)、物流系统、柔行制造系统(敏捷制造系统)及一切非标准随服务系统中,均可以采用plc,进而建模和采取对策并优化。plc的前途一片美好,一切悲观的论点是站不住脚的。至于技术进步,plc与其它技术融合以至消失,那还需要一定的时间!
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