Modicon M580 Complex Topologies, System Guide

In complex M580 architectures, you can use a dual-ring switch (DRS) to perform these functions: • integrate fiber cable on the main ring for distances greater than 100 m between two contiguous remote drops. (You may also use BMXNRP020• fiber converter modules for this purpose.) • enable distributed equipment to participate on the RIO network • enable RSTP recovery support for devices on the sub-rings • isolate the sub-rings from one another and from the main ring to improve system robustness • provide redundancy between the main ring and a sub-ring when two DRSs are installed next to each other with specific predefined configuration files • separate master and standby controllers in a long-haul Hot Standby system (see Modicon M580 Hot Standby, Frequently Used Architectures, System Guide) NOTE: You can also use a BMENOS0300 module on the local rack or a remote drop to manage distributed equipment in a non-redundant manner. The following graphics are example of DRSs with copper ports and copper/fiber ports. The numbers in the graphics refer to the ports on the DRSs, which correspond to elements of predefined configurations you will download to the switch. Refer to the Predefined Configuration Files chapter, page 32 for details. NOTE: Use the predefined DRS configurations. Since they are optimized to support 50 ms maximum recovery time, the system can recover within 50 ms from a communication disruption on the main ring or on a sub-ring. If you need to customize a configuration, contact your local Schneider Electric service representative before adapting a switch configuration for your system.