工业以太网技术的发展和广泛应用,从形式上拉平了DCS和PLC网络方面的差距。从表面上看很多DCS和PLC都应用了工业以太网,但是其实质上的差距却依然存在。以很多PLC采用的MODBUS-TCP以例。MODBUS是串行通讯协议,不是网络,大家都没有疑问;MODBUS-TCP是网络吗?很多人就有疑问了。仔细分析,MODBUS-TCP是将MODBUS通讯协议加载到以太网的TCP协议之上的一种通讯方式,它虽然具有了网络的外形,但依然是一主多从的管理方式,数据表的传输结构。
而DCS呢,以NT6000的ELIN网为例,虽然也是基于工业以太网的,但其应用层协议是积累了近30年的无主令牌LIN网协议,在1M的OLIN,2.5M和20M的ARCNET上都有长期成功的应用。ELIN网上,各站平等,不存在主要管理站。而且数据通讯是以模块为单位的结构化数据,数据管理能力非数据表方式可比。
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