I found a peculiar issue today. The C1:IOO-MC_RFPD_DCMON remains constantly 0. I wonder if the RFPF output is being read properly. I opened the table and used an oscilloscope to confirm that the DC output from the MC REFL photodiode is coming consistently but our EPICs channel is not reading it. I tried restarting the modbusIOC service but that did not affect anything. I power cycled the acromag chassis while keeping the modbusIOC service off, and then restarted teh modbusIOC service. After this, I saw more channels got stuck and became unresponsive, including the PMC channels. So then I rebooted c1psl without doing anything to the acromaf chasis, and finally things came back online. Everything looks normal to me now but I'm not sure if one of the many channels is not in the right state. Anyways, problem is solved now.