VE3006 12P3439X012工控模块,EMERSON产品尺寸
冗余内存交换（RMX）模块作为反射内存上的节点运行网络或作为冗余RX7i系统中CPU之间的专用链路。当RMX为它不用作冗余系统中的链路，功能与IC698CMX016相同单元网络中的每个节点都可以是与兼容的任何反射内存设备5565家庭。每当数据写入一个节点时，网络上的所有节点都是使用新数据自动更新。
VE3006 12P3439X012工控模块当用作反射内存网络上的节点时，RMX模块提供确定性在高速光纤网络上的PLC和其他计算设备之间共享数据。反射内存网络最多可包含256个节点。反射内存网络中的每个节点使用光纤连接在菊花链环路中光缆。第一个节点的发射器与第二个节点的接收器相连。这个第二个节点的发射器与第三个节点的接收器相连，依此类推，直到环路结束在第一个节点的接收器处完成。在CPU冗余系统中使用时，RMX模块提供传输数据的路径在冗余系统中的两个冗余CPU之间。完整的通信路径由一次机组中的一个RMX、二次机组中的一个RMX和两个高速相互连接的光纤电缆。这必须是一个两节点环：没有其他反射内存节点允许成为该光纤网络的一部分。GE强烈建议使用两个冗余链路（共四个RMX模块）已配置并安装。可选地，可以为单个冗余链路（a）配置系统共两个RMX模块）。当RMX用作冗余系统中的链路时，它不能用作通用内存交换模块。有关PACSystems CPU操作的详细信息冗余系统，请参阅PACSystems热备CPU冗余用户手册，GFK-2308。PACSystems RX7i主机架最多支持四个内存交换模块RMX016和CMX016模块的组合。最多可以使用两个RMX模块配置为冗余通信链路。
The Redundancy Memory Xchange (RMX) module operates as a node on a reflective memory
network or as a dedicated link between CPUs in a redundant RX7i system. When the RMX is
not being used as a link in a redundancy system, it is functionally identical to the IC698CMX016
module. Each node in the network can be any reflective memory device that is compatible with
the 5565 family. Whenever data is written to one node, all nodes on the network are
automatically updated with the new data.
When used as a node on a reflective memory network, the RMX module provides deterministic
sharing of data among PLCs and other computing devices on a high-speed fiber optic network.
A reflective memory network can contain up to 256 nodes.
Each node in the reflective memory network is connected in a daisy-chained loop using fiber
optic cables. The transmitter of the first node is tied to the receiver of the second. The
transmitter of the second node is tied to the receiver of the third node, and so on, until the loop
is completed at the receiver of the first node.
When used in a CPU redundancy system, the RMX modules provide a path for transferring data
between the two redundancy CPUs in the redundant system. A complete communications path
consists of one RMX in the primary unit, one RMX in the secondary unit, and two high-speed
fiber optic cables connecting them to each other. This must be a two-node ring: no other
reflective memory nodes are allowed to be part of this fiber optic network.
GE strongly recommends two redundancy links (a total of four RMX modules) be
configured and installed. Optionally, systems can be configured for a single redundancy link (a
total of two RMX modules).
When the RMX is being used as link in a redundancy system, it cannot be used as a generalpurpose Memory Xchange module. For details on the operation of a PACSystems CPU
redundancy system, refer to the PACSystems Hot Standby CPU Redundancy User’s Manual,
GFK-2308.
