1. ACC ? Detector PVSS II Ethernet Database(s) OPC client DIM client 14448 High VoltageLow Voltage User interface PVSS II LV PMD Control room (ACR) [FSM?] Crate Control On-detector electronics 32 Temp. Monitor VME (wiener?) 1 15/03/06 Detector 12156 Crocus (on-detector crates) UX-C05/06 CR3 CR4-X03 UX-C05/06 SY1527 (A1821N) CAEN OPCserver EASY 3000 PVSS II OPC client E HV LV 48V PS C LV (48V) 12661 CR3 PCI-CAN Wiener OPCserver PVSS II OPC client C CR3 PCI-CAN ELMB OPCserver PVSS II OPC client C 1 ELMB 2 DDL CR3 SG2 CR5 SG2 Gas system PLC Gas E Detector PVSS II DIP [GWG] Gas Gas PVSS UX-C CR3 Cooling Plant PLC Detector Cooling E Detector PVSS II Modbus/TCP 1 [TS/CV] TS/CV SCADA

2. PMDDCS SMI Control Unit SMI Device Unit VETOPRE HVPS UM2448 UM 023 LVPS 2.5 - 2.5 HV 3.3 Detector oriented hierarchy CrateCtrl Temp Hardware Device Infra

3. Present Standard State diagram for the DCS Due to the increasing number of integrated sub- systems in the ALICE DCS, in order to allow a complete integration the present sub- detector DCS state diagram may change. GO_STANDBY CONFIGURE (run_mode) CALIBRATE (calib_mode) GO_BEAM_TUN GO_READY MOVING_BEAM_TUN MOVING_STBY_CONF MOVING_READY MOVING_BEAM_TUN CONFIGURE (run_mode) CALIBRATE (calib_mode) GO_STBY_CONF GO_READY GO_STBY_CONF GO_BEAM_TUN CALIBRATE (calib_mode) CONFIGURE (run_mode) LOCK OFF DOWNLOADING GO_OFF CONFIGURE (run_mode) GO_STANDBY CALIBRATING READY DOWNLOADING READY_LOCKED UNLOCK STBY_CONFIGUREDSTANDBYBEAM_TUNING CALIBRATINGDOWNLOADING STOP

4. Need Of LVDB Without LV Distribution, if the LV trips all 6 chains on the module consisting 4608 cells will be off. LV segmentation will help in isolating the faulty chains by tripping LV supply for the particular chain if fault persists.Also fault can be monitored remotely and can be use for data analysis. Prevents FEE boards from going bad due to excess current drawn by the chips due to HV sparks.

5. General description of LVDB LVDB helps us in actively distributing the LV- supply among the FEE board chains (12 FEE Boards per chain). It also controls the over-current in a chain which may be caused by HV spikes or board going bad. Current limit can be adjust for the different no of FEE boards in a chain. One board can supply 6 chains and also through DCS, chains can be monitored and we can have off time of chain in database.

6. Low Voltage Distribution Box (LVDB) To translator Supply Current adjustment pot Sensing points to DCS Power I\P from LV Supply

7. Remaining work LV no work done till now FSM’s need to be finalized Configuration dB Testing and finalization of LVDB Use of ALICE GUI