For almost exactly 10 mins, network connection to the h1pslctrl0 machine (Beckhoff PLC controller in the diode room) was lost. The DAQ-EDCU reported loss of channels, and the laser MEDM screen showed disconnected channels. It would appear it all came back by itself.
Problem was between the times 18:22:16 and 18:32:17 UTC Friday 22 Feb 2019.