Kyle pulled the fuse for the LX PT180 Inficon BPG402 gauge on Nov. 22 (alog 31814). For reasons not entirely clear to me, this put all of the input channels for LX into an invalid state with their values flatlined. In Beckhoff this error was was only indicated by the WcState for each channel.

To fix this, in the TwinCAT software on h0vaclx, I right clicked on 'Pressure Gauge PT180 (BPG 402)', clicked on 'Disable', then went to the 'TwinCAT' menu and ran 'Activate Configuration'. When it asked whether to restart in run mode I said yes. This ended up crashing the EPICS IOC, which I restarted. I burtrestored the IOC to 6:00 AM on Nov. 22 (local time).

For each readback channel there is a channel with the same name that ends in _ERROR. These channels reported this condition, however they are not on any of the overview MEDM screens or in any alarm handler. This should be changed.

So currently, the PT180 pressure gauge is powered off and disabled in Beckhoff. The other LX channels should be valid again.