Maximum IO Modules per Cluster for AC800F
Both of theanswers above are correct in that the maximum per Cluster segment is 12 S800 modules, this also holds true when using the TB840/TB840A and the TB820. The two additional things to be aware of are:
1. When using the DO820 module, you are limited to a maximum of 10x DO820 modules in a cluster segment due to the current draw required by the on-board relays used by the module.
2. As previously pointed out in the response regarding checking the Profibus manual, you also want to make sure to not overload the Profibus data going through the CI840, so this may also limit or effect the I/O mix on a segment.