PACSystems RX3i Manual
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PACSystems* RX3iIC695RMX128-CGGFK-2511H Redundancy Memory Xchange ModuleJuly 2013The PACSystems* Redundancy Memory Xchange (RMX) moduleoperates as a node on a reflective memory network or as a dedicatedlink between CPUs in an RX3i Hot Standby CPU Redundancy system.When the RMX is not being used as a link in a redundancy system, itis functionally identical to the IC695CMX128 module. Each node in thenetwork can be any reflective memory device that is compatible withthe 5565 family. Whenever data is written to one node, all nodes onthe network are automatically updated with the new data.When used as a node on a reflective memory network, the RMXmodule provides deterministic sharing of data among PLCs and othercomputing devices on a high-speed fiber optic network. A reflectivememory 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 nodeis tied to the receiver of the second. The transmitter of the secondnode is tied to the receiver of the third node, and so on, until the loop iscompleted at the receiver of the first node.When used in a CPU redundancy system, the RMX modules provide apath for transferring data between the two redundancy CPUs in theredundant system. A complete communications path consists of oneRMX 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 atwo-node ring: no other reflective memory nodes are allowed to be partof this fiber optic network.GE Intelligent Platforms 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 twoRMX modules).When the RMX is being used as link in a redundancy system, it cannotbe used as a general-purpose Memory Xchange module. For detailson the operation of a PACSystems CPU redundancy system, refer tothe PACSystems Hot Standby CPU Redundancy User’s Manual,GFK-2308.A PACSystems RX3i main rack supports a maximum of six MemoryXchange modules in any combination of RMX128 and CMX128modules. A maximum of two RMX modules can be configured asredundancy communication links.* indicates a trademark of GE Intelligent Platforms, Inc. and/or its affiliates. All other trademarks are the property of theirrespective owners. All rights reserved. |
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