# Alarm heartbeat PVs (ALRM:HRTBT changes alarm status to major every 10 min,
# back to no_alarm 30 sec later) 
record(calc, "$(STN):IOC:ALRM:COUNTER")
{
        field(DESC, "Alarm heartbeat counter")
        field(SCAN, "Passive")
        field(PINI, "YES")
        field(VAL,  "0")
        field(CALC, "(A<B)?(A+1):0")
        field(INPA, "$(STN):IOC:ALRM:COUNTER.VAL NPP NMS")
        field(INPB, "59")
}
record(calc, "$(STN):IOC:ALRM:HRTBT")
{
        field(DESC, "Alarm heartbeat")
        field(SCAN, "10 second")
        field(CALC, "(A<B)?0:1")
        field(INPA, "$(STN):IOC:ALRM:COUNTER.VAL PP NMS")
        field(INPB, "57")
        field(HIHI, ".5")
        field(HHSV, "MAJOR")
}