基本细节:SR750-P5-G5-S5-HI-A20-R-E 保护继电器 三个串行端口
SR750-P5-G5-S5-HI-A20-R-E保护继电器
750/760 配备三个标准串行通信端口，一个位于前面板的 RS232，两个位于继电器后部的 RS485/RS422。后部以太网端口也可作为可选功能提供。前面板端口允许轻松访问本地计算机。后部端口提供远程通信或与 DCS、SCADA或 PLC的连接。所有串行端口的波特率在 300 到 19,200 bps 之间变化。可选的以太网端口可用于连接 750/760 至 10 Mbps 以太网网络。750/760 支持 ModBUS® RTU、DNP3.0 Level2和 ModBUS RTU TCP/P 协议，三个串行端口支持 ModBus RTU 协议，而两个后置端口中的任何个(但不是两个)都可以配置为支持 DNP 3.0 Level2。可选的以太网端口通过 TCP/P 协议支持 ModBus RTU，750/760的通信系统旨在允许通过所有端口同时进行通信。使用以太网作为物理介质将 750/760 集成到本地。
基于现场总线技术的新控制策略和网络结构将对现有的仪表和控制系统产生革命性的影响。本文基于现场总线技术的本质特点，分析了现场总线技术对传统分布式控制系统DCS的影响，并基于直流网络结构特点，提出了三种将现场总线集成到DCS中的实现方法。
SR750-P5-G5-S5-HI-A20-R-E
SR750-P5-G5-S5-HI-A20-R-E protective relay
The 750/760 is equipped with three standard serial communication ports, one RS232 located on the front panel and two RS485/RS422 located on the rear of the relay. A rear Ethernet port is also available as an optional feature. The front panel port allows easy access to the local computer. The rear port provides remote communication or connection to the DCS, SCADA or PLC. The baud rate for all serial ports varies between 300 and 19,200 bps. An optional Ethernet port is available for connecting 750/760 to 10 Mbps Ethernet networks. 750/760 supports ModBUS® RTU, DNP3.0 Level2 and ModBUS RTU TCP/P protocols, three serial ports support ModBus RTU protocols, Either (but not both) of the two rear ports can be configured to support DNP 3.0 Level2. The optional Ethernet port supports ModBus RTU over TCP/P, and the 750/760 communication system is designed to allow simultaneous communication over all ports. Integrate 750/760 locally using Ethernet as the physical medium.
The new control strategy and network structure based on fieldbus technology will have a revolutionary impact on existing instrumentation and control systems. Based on the essential characteristics of fieldbus technology, this paper analyzes the influence of fieldbus technology on the traditional distributed control system DCS, and puts forward three methods of integrating fieldbus into DCS based on the characteristics of DC network structure.
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