One a section of our modbus plus network we have a bridge plus and a 984 controller on one side of a fiber modem. On the other side of the fiber modem we have two more 984 controllers and five quantum controllers. When I try to add one more quantum controller the bridge plus and 984 controller on the other side of the modem start getting cable b framing errors. All devices use the MBKT type of connectors and we are well under the 1500 foot maximum cable length. Could anybody shed some light on this problem?

 

Make sure you are putting MBKT terminator in the network. Hope you are using redundant MB+cabling.