Interesting!!
I think you have cracked it Ken, because there is one piece of information I didn't give that I am now thinking may be relevant based on what you are telling me and my rudimentary understanding of what all this stuff means
When I was initially troubleshooting this networking issue, one of the first things they had me do was check to see if ethernet was plugged into Powerflex 70 20-COMM-ER. I removed the LCD HIM and found that it was. However, the ethernet had been plugged into port 2 (I believe this would correspond to "B" in parameters). They said "it's supposed to be plugged into 1 so try that" which obviously didn't change anything because my 20-COMM-ER ribbon cable had given up the ghost
It seems to me that my programming for 20-COMM-ER parameters #37 and 38 being set to 3 means that Datalink B is not enabled, despite my drive having previously been communicating with the PLC over port 2 from the factory. I surmise that if the PLC was connected to this drive via port 2 when it had last seen it on the network (faulted), maybe it's still waiting to hear back via port 2, which the new drive is not configured to do. Or maybe I'm way off base again! Haha
Here is some relevant information I dug up before you had posted your most recent message. Some of it was posted before as you noted, and some of it I have not posted. I think it might be helpful to have it organized in one place now that our focus is narrowed.
AB literature on 20-COMM-ER M-S settings:
AB literature on 20-COMM-ER status:
Parameters I now understand are relevant from 20-COMM-ER and PowerFlex 70:
Reset procedure for 20-COMM-ER:
I take it I just need to connect with CCW, change parameters 37 & 38 in 20-COMM-ER from "3" to "7" and then cycle power to the drive? We aren't thinking we need to mess with Powerflex 70 parameters 300-317 at this point, right?
Must I only cycle power to the drive or can I cycle power for my entire machine?
Should I follow the reset procedure for 20-COMM-ER or would cycling power to drive / machine achieve same result?
I tried looking for a "reset" parameter in my Powerflex 70 in CCW and didn't see one like there is for my 20-COMM-ER module. Let me know if there is a "better" way to cycle power to my Powerflex than just cycling power for entire machine
Thank you for all your help on this!