CS31 Bus Extension with CM574-RS Module

If more than one CS31 line is needed, CM574 can be used for extension. The following picture demonstrates an example of CPU and CM574 hardware configuration tree:

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Hardware Configuration Tree. Option 2.

  1. Shows the configured device type: CM574-RS.

  2. Configure Interfaces as “shared” com ports. Engineering of underlying CS31 lines and CI590-CS31-HA is done in the CPU hardware tree.

  3. Shows the configured PLC type.

  4. Addition of local I/O Bus modules is possible but the I/O modules will not be redundant.

  5. CS31 Bus module below CPU COM1 interface.

  6. CI590-CS31-HA module and IO modules below CS31 Bus.

  7. UDP data exchange below the ETHERNET interface. This is mandatory for a HA-CS31 system to RUN, it does the synchronization between CPU A and CPU B.

  8. CM577-ETH module below the coupler slot for program download, OPC server communication etc. We recommend you, to have separate ETHERNET slot for UDP data exchange and PC connectivity. In another case if a user has a PLC with more than one onboard ETH port (Example: PM595, PM591-2ETH) the user can use ETH2 port for downloading e.g. the program, webserver, OPC server communication etc. Refer to Requirements.

  9. CM574-RS for CS31 extension.

  10. CS31 Bus module below CM574-RS COM1 interface and CI590-CS31-HA module and additional I/O modules.

Note

PM591-2 ETH and PM595 PLCs must use onboard ETH1 for UDP data communication.

The following hardware configuration (CS31 lines below CM574-RS) is not supported for a HA-CS31 system even though it is supported by Automation_Builder:

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Not supported/ not recommended hardware configuration.

For more details about the configuration please refer to the Example_AC500_HA_CS31_V242_3ADR023070M0201.pdf.