PROFINET CBA This section contains information on the following topics:Information regarding PN_IN, PN_OUT, and PN_DP (S7-300, S7-400)PN_IN: Update the inputs of the user program interface (S7-300, S7-400)PN_OUT: Update the outputs of the user program interface (S7-300, S7-400)PN_DP: Update DP interconnections (S7-300, S7-400)