Jaco van Niekerk
Member
Hi good day PLC Talk Community.
Can somebody please shed light on 1756-DNB Diagnotic Counters and what they mean. DNB Scanner Diagnostic Counters can be accessed under RSLinx as per attached photos, one with diagnostic error counts & the other where I have cleared the counters.
I'm on a mission to try & understand trouble shooting of Bus-Off error experienced and their causes. Reading up on Rockwell 's DNB Manual & Knowledge Base on how to identify and fix Bus-Off errors unfortunately doesn't help me with an effective method to pin point the origin or root cause their of which can be a bit of a nightmare.
Today I had a faulty DNet Comms Module, RDNA-01 had a Network Status Error, replaced of an ABB ACS800 VSD after experiencing a Bus-Off error on the DNB Scanner. It was purely just a guess, DNB Scanner is now Running for about 7hrs without any further Bus-Off errors, time will tell. How & why the RDNA-01 DNet Comms Module can possibly cause a Bus-Off error on the DNB Scanner cannot be proven by me, or at least I don't know how to. I have also previously experienced Allen Bradley DNet Comms Modules on Power Flex VSDs causing Bus-Off errors (Different Scanner) especially when a whole lot of them (Devices) are removed from the Devicenet Network when a MCC Power Failure is experienced. What causes the Bus-Off in this case? Thank you.
Kind Regards;
Jaco van Niekerk.
Can somebody please shed light on 1756-DNB Diagnotic Counters and what they mean. DNB Scanner Diagnostic Counters can be accessed under RSLinx as per attached photos, one with diagnostic error counts & the other where I have cleared the counters.
I'm on a mission to try & understand trouble shooting of Bus-Off error experienced and their causes. Reading up on Rockwell 's DNB Manual & Knowledge Base on how to identify and fix Bus-Off errors unfortunately doesn't help me with an effective method to pin point the origin or root cause their of which can be a bit of a nightmare.
Today I had a faulty DNet Comms Module, RDNA-01 had a Network Status Error, replaced of an ABB ACS800 VSD after experiencing a Bus-Off error on the DNB Scanner. It was purely just a guess, DNB Scanner is now Running for about 7hrs without any further Bus-Off errors, time will tell. How & why the RDNA-01 DNet Comms Module can possibly cause a Bus-Off error on the DNB Scanner cannot be proven by me, or at least I don't know how to. I have also previously experienced Allen Bradley DNet Comms Modules on Power Flex VSDs causing Bus-Off errors (Different Scanner) especially when a whole lot of them (Devices) are removed from the Devicenet Network when a MCC Power Failure is experienced. What causes the Bus-Off in this case? Thank you.
Kind Regards;
Jaco van Niekerk.