If the suspension damping loops become instable, the ISI watchdogs must trip. Consequently, one of the ISI watchdog inputs is the state of the suspension watchdogs (for instance ITMY & FMY for BSC8). The connection between the ISI and the SUS model is realized using EPICS channels.

Seismic was concerned by the reliability of the EPICS connection between the two models that could trip the ISI watchdog in case of connection loss.

During two weeks, we exclusively fed the SUS-ITMY watchdog state variable into the ISI watchdog (making sure SUS-ITMY watchdogs could not trip). During this period, the state of the ISI watchdogs did not change. It confirms that we can use the EPICS channels for  SUS-ISI watchdogs interactions.