I'm currently onsite and the whole system is down basically the system consists of a main control panel at the water treatment plant (Filter Control Panel, or FCP) and the master PLC is the S7-300. It's definitely PROFIBUS, so I know that much. I know it's a broad question, but if anyone had any suggestions for what I might look for, and/or what the BUSF failure could indicate, I'd be most appreciative. They've tried power cycling everything but that does not seem to help. The system operator has told me that the problem started after a recent storm (with lightning). From what I've gathered from some Google searching already, this failure indicates that there is a comms failure between the master PLC and one or more of its slaves, which are communicating via PROFIBUS. The specific issue is that on the master PLC, there is a "BUSF" failure. The system is a water treatment plant, and the master PLC is a Siemens Simatic S7-300. I've never worked with this particular site so I'm not entirely sure what to expect, though I am lucky in that the company I work for installed it (back before I worked here) so I have some pretty good system level documentation. Tomorrow I'm heading down to take a look at an existing SCADA system that has failed, and I was wondering if anyone had some suggestions for what I might keep an eye out for.
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