1756-IB16IF
1756-IB16IF
(1)开放性。关于开放性,这个问题是制约dcs发展的一个很大的因素,由于dcs各厂家对于自己的网络协议和系统软件采取严格的保密措施,这就造成了如果别的厂家的plc或其它的控制设备就不可能很好的无缝的接入dcs控制系统,往往需要经过复杂的协议转换,得到的通讯速率和通讯能力都很不理想,例如honeywell公司的tps系统和ab公司的plc5系列的plc进行通讯就需要通过串口并加上双方为通讯开发出来的辅助设备来实现,但当通讯量较大时,其实时性就大大降低,这个问题就阻碍了dcs的应用领域和竞争力。目前一些dcs厂家已经意识到该问题的严重性,目前honeywell公司主推的pks控制系统就采取了controlnet的通讯网络,舍弃了传统的lcn网,且采用了服务器结构的形式,使其开放性大大加强。除去通信问题以外,
现货,现货,降降降,火火火,火火火……
现货,现货,降降降,火火火,火火火……
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