S20330-SRS KOLLMORGEN

A5E00692292
PT878 GE
1794-IRT8
ABB 5761789-6H
MG3-1C-1F-1J-A
MG3-1H-1H-PA
ADVANTEST R6552T-R
ABB 5761789-6H
Triconex通讯卡件4211
499ATRDO

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描述

DCS惯常使用两层网络结构,一层为过程级网络,大部分DCS使用自己的总线协议,ABB的Profibus、ABB的CAN bus、施耐德的Modbus等,这些协议均建立在标准串口传输协议RS232或RS485协议的基础上。现场IO模块,特别是模拟量的采样数据(机器代码,213/扫描周期)十分庞大,同时现场干扰因素较多,因此应该采用数据吞吐量大、抗干扰能力强的网络标准。基于RS485串口异步通讯方式的总线结构,符合现场通讯的要求。

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