CI854 on ProfiBus with CI840 clusters cannot communicate with all the clusters
The hardware configuration including a CI854 on the ProFibus CI840 clusters is only able to communicate with one cluster that is addressed as 2. Any cluster with AI845 or AO845 in positions 7 or greater with the Redundancy parameter set to "true" will "generate a system down error" in the hardware status of the CI840 module.
Changing the redundancy setting to FALSE should resolve the problem.
Use of redundancy will limit the maximum number of S800 modules on cluster. Each cluster may contain up to 12 single S800 /O units or up to 6 redundant S800 I/O units.
On this particular issue >>>> Module Redundancy was not desired, but default Redundancy setting was making number of IO units per cluster over 12 which is not permitted. Please refer to AC800M Contoller Hardware 3BSE036351-510 manual section3- I/O systems page 156-157 for details.