Does anybody know of an A-B DH485 network with more than a dozen nodes? (that doesn't have comms problems). Where i work we have a network of 14 nodes and we have problems accessing the network using an AIC unit with rslinx. (A-B claim that a DH485 network is good for 31 nodes). The nodes include 8 slc plcs, 5 Panelviews & a KA5 bridge card to a DH+ network. We also have a KT card in the pc which allows us onto the DH+ network (consisting of 3 plc5's & a citect pc) which works fine. If we access the DH+ network, then go to the bridge card, then we can access the DH485 network ok (but not via the AIC unit!!). The panelviews talk ok to the plcs, & vice versa. Problem first arose when the last two nodes were added. Any comments much appreciated.