CLAS12 ECAL PCAL DC FTOF... Region 2 DewPnt Region 3 Region 4 Region 1 Mod 1... Mod 2 HV TEMP LV Hierarchy of Slow Controls: Driven by Finite State Machine EPICS is integrated with SMI++ software SVT is part of hierarchy: DewPoint and Region branches. SVT Commands propagation from top to bottomAlarms propagation from bottom to topFSM schema defines states, commands,relation between nodes.Node commands: switch on, switch off, disableNode states: on, off, ramping, error, disabled,...

Fragment of GUI with SVT alarm propagation (Qt generic GUI : automatically digest any FSM hierarchy: no configuration needed )

SVT slow controls components: HV, LV: Software: Driver/Epics IOC Hardware: Wiener MPOD crate, boards: Wiener MPV 8008L, ISEG EHS F 205 PF Temperatures, humidities, dew points: Software: Driver/Epics IOC Hardware: VME crate, board: Highland V450. Implemented algorithms (via finite state machine): Order of switching LV and HV Power down HV if LV is not ON Power down the module if T is out of range Power down the detector if Dew Point is out of range The algorithms can be bypassed using nodes DISABLING.