Possiblity of the CI840 usage in the Optical modulebus
Is it possible to use the CI840/CI840A in Optical modulebus?
You mean CI840 to acts as direct IO communication?
Generally Direct IO doesn't use CI840 where in it acts as indirect IO/profibus slave for the communication with S800 IO.
If you don't use Optical extensions (like TB805/TB806 for noin-red and TB845/TB846 for red IO.)
then you can connect max of 12 modules/cluster if you use these extensions to the Ci840 then we call it as station then you can connect 24modules/station.