1. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 DCS – Frontend Monitoring and Control

2. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 FEE Architectures in Alice DETECTOR Control (setup of DCS Parameters…) Monitoring (Temp, I, V, Status…) DCS Supervisory Layer A/D Conversion (e.g. PLC…) Detector-DCS “Shared” architecture Detector “private” architecture Standard Software Interface DCS “private” architecture HARDWARE INTERFACE PRIVATE LINK FIELDBUSETHERNET… PRIVATE LINK FIELDBUSETHERNET…

3. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 Example: TRD FEE Design Readout chamber MCM ADCs (Temp, I,V) MCM Ethernet (TCPIP) DCS ADC (Humidity, I,V) Control Workstation DCS Voltage Regulators Both Control and Monitoring based on TCP/IP Ethernet Connection

4. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 Example: FEE in TPC Readout Chamber FEC DCS Network Profibus (Ethernet…) RCU Both Control and Monitoring based on Fieldbus

5. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 Configuration via DDL initiated by DAQ DAQ initiates FEE setup (by sending a command) Acknowledge DAQ starts polling the status Not Ready Ready Control CPU recognizes the request Control CPU informs the DCS DAQ DDL Local Control DCS + FEE FEE Ready DCS releases the equipment and confirms the request Control CPU informs the DCS FEE Configuration

6. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 Why do we need involve ECS in configuration? A.DCS may need to ask for reconfiguration in some cases (e.g. voltage regulator failure) B.It should be possible to reconfigure FEE without the presence of DAQ (recovery from power cut)

7. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 A. Configuration via DDL initiated by DCS DAQ DDL Local Control DCS + FEE FEE Configuration ECS DCS DAQ DCS asks for reconfiguration of FEE ECS routes the request to DAQ Ready

8. Peter Chochula CERN-ALICE ALICE DCS Workshop, CERN September 16, 2002 B. Configuration without DAQ DAQ DDL Local Control DCS + FEE FEE Configuration ECS DCS DAQ DCS asks for reconfiguration of FEE Ready ECS routes the request to local control CPU