If the H1 card fails, the system loses visibility on the attached fieldbus segments. On a segment that does not support the backup Link Active Scheduler (LAS), if the H1 card failure causes the PCMCIA within the H1 card to go down, all communication on the attached fieldbus segment stops.
To recover from an H1 card failure, replace the card. The H1 card is automatically downloaded and resumes functioning as the LAS. Startup of the loop depends on how the loop is configured.