[Dsg-hallb_magnets] Magnet Issues

[Brian Eng]

Just to keep everyone on the same page, the local chassis of the solenoid PLC lost network yesterday and was recovered by a power cycle.

https://logbooks.jlab.org/entry/4302975

Due to the loss and recovery of the solenoid PLC the torus PLC lost its connection to the solenoid PLC, since they share tags these are no longer getting transferred between them (at a minimum DP8620VCLDP isn't updating on the torus, but is on the solenoid).

Performing a "Reset PLC Interlocks" from the MPS screen should​ recover this connection, but it doesn't appear to be working. Normally in the past when this has happened I've connected to the PLC and manually togged the error bit. However, we still can't go online with the torus PLC.

https://logbooks.jlab.org/entry/4252466

Rockwell Automation pointed to a knowledge base article about this error, which I've attached as a PDF. In short it is due to a firmware anomaly which I've confirmed via their packet logs. It will at a minimum require a power cycle of the torus PLC to recover. We should plan on updating the firmware during the upcoming SAD.

I'm still waiting to hear back if the power cycle can be postponed until the pass change tomorrow or needs to be done today.
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