Can we have multimaster profibus configuration for AC800 M Controller
we have requirement where we need to connect profibus RIO(redundant CI840) system with two (2) PM866 controller located at two different location.
In case one PM866 Controller is lost this RIO should be able to connect to second PM866.
Please see the attachedment for topology
Hello, CI840 do not support this functionality. With multimaster, 2 or more profibus masters can share a profibus media but not slaves (not for cyclic data, for acyclic data 2 masters can talk to same slave). there may be 3rd party I/O supportlien this, but I am not aware of such.
I think no.
For sure, CI840 is intended for redundant CPU's, it can't be used in your case.
Look in the attached slide. Using of RLM01 ?? But it is intended for field instruments, connected to 1 CPU by 2 lines (line redundancy).
Your case is different - I think it is difficult or impossible to synchronize the programs in 2 CPU's as primary and backup, if they are not connected as redundant.
As commented if distance is 60-70m only between two controller, then combine applications and make it redundant controller pair, as PM866 allows redundant controller can be 200 m apart(check image below) and note this only possible in V6.0. In this case you can connect in multi drop or other way so that even if one(primary) controller fails second one(secondary) can take over and your CI840 is always be slave of either PM866 controller.
Hope that helps...