Following the Beckhoff chassis work, we brought the h1psl0 system back online by power cycling the CPU and IO Chassis. We are seeing a regular excursion of the IRIGB timing signal on the IOP model (every restart in the past two days has seen this). It takes about 30mins to ramp back to its nominal value. In the plot you can see the current ramp and the one associated with last night's reboot.