So at work I’ve recently had to replace an HMS AB7607 ethernet/devicenet gateway on one of our older networks. The older device was a AB7607-B ( rev1.8 ) and the new device was a AB7607-C (rev 2.4), the new device accepted the old config through RSNetworx for devicenet without any issues. But what i found is that I was now getting code16#0109 Connection Request error: Invalid Connection Size on the gateway in my IO tree in rslogix. None of the mapping in the gateway has changed the only way i could get it to connect and get the fault to clear was increase the input and output sizing to maximum (as seen in the attached pics). This then created the issue of intermittent comms dropouts on the scanner so i had to issue increase the RPI from 50ms to 100ms. which i shouldn’t have to do as the network is fairly small with only 5 nodes made up of 3 encoders and 2 IO modules. The network is now running but occasionally all three encoders will flat line this has only begun to happen since the change out, i’ve checked the network with a scope and the signal looks fine and i’ve checked all device taps, powertaps and end of line resistors which are all fine. The only thing i can think of which would cause this issue is me maxing out the input/output word sizing and the increase in the RPI.
So my question is how can i reduce the word sizing back to only grab the data i require as when i change the values from anything lower than the max size input output I run into the word sizing fault again. I’ve ensured that everything is matching up ie SINTS are being used in the scanner and PLC so there’s no mismatches. Ive gone over the manual and i can see anything why i would event need to increase the word sizing after the upgrade. Is anyone able to help?