On 24th October 2018 I found some of the Beckhoff SDF systems were unresponsive (alog-44798), at that time I started an hourly script which checks that the display list responds to commands. I've been checking the SDF status periodically, more infrequently recently.

Today I found that h1ecatc1plc2sdf is reported as being unresponsive, which I verified by trying to change the channel list from 'differences' to 'not monitored' channels. I think Daniel was using this SDF on Tuesday, so presumably if has failed in the past 4 days.

I'll restart this faux-model on Monday, and change my checker to email problems if the time-between-failures is as large as 3 months.