I have four Ethernet/IP to Profibus gateways which all lost connection to four different Profibus networks. I believe this occurred after the PLC on the Ethernet/IP side (an Allen-bradley ControlLogix) was changed from one PLC to another; there may have been a period where two PLCs were trying to address the modules at the same time on the Ethernet/IP side.
These Gateways were functioning for a few months prior to this incident.
Here’s the status of the LEDs of the Profibus side:
-GW status – green
-Acyclic – Off
-Online – Off
-Offline – red
-Diagnostics - Off
Here’s the relevant information from the web diagnostics page.
|Existing Status word
|Master Operation Mode
The Ethernet/IP side is working correctly.
Here is what has already been checked:
-Configuration file (tried redownloading it to one of the modules)
-Address dials (verified as correct address)
-profibus cable (connection is fine)
-tried resetting and power cycling the module
-tried changing Ethernet/IP PLC back to old one
The Profibus master (a Siemens S7-414 CPU) does not report that the module is offline in its network diagnostics and reports no other issues. I don’t have direct access to that PLC but am working to get more confirmation as that has really hung me up on this issue.