The FEE Server Control Engine of the ALICE-TRD - Westfälische ...

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FeeServer Core creates an instance of calls in a separate thread 5 The FEEServer Control Engine CEStateMachine calls its contructor constructor main tasks: − register DIM channels − initialize the logging system − sets the FSM state to STANDBY CEStatemachine::loopFunction() − contains an infinite loop − task: sensor monitoring Figure 5.2: Control flow during the initialisation of the control engine. The control flow is symbolized by the solid lines. The dashed line is for illustration purpose only. Second, the constructor initializes the logging system (for details see section 5.5). Third, it initializes the FSM and sets the state of the FSM to STDBY. When the control engine is initialized, the FEEServer core creates a separate thread and calls the function int CEStateMachine::loopFunction(void). This function contains an infinite loop. The function reads the DCS board temperature sensor and the voltage sensors by calling float voltage_sensor::read_voltage(int) and float temp_sensor::read_temp(int) (see section 5.2.4) and updates the corresponding DIM data channels in regular intervals. If the MCMs are switched on later and the MCM temperature monitoring is activated this function triggers the regular readout of the MCM temperature sensors, too. After the initialization is finished the system waits for incoming commands from the ICL. 5.2.2 The Finite State Machine Figure 5.3 shows the state diagram of the TRD frontend readout electronics. The finite state machine (FSM) of the control engine implements all these states execpt the states OFF and READY. Description of the finite state machine states In state OFF the supermodules have no power. The DCS boards are off and the FEEServer with the control engine is not running. Therefore OFF cannot be reached by the control engine itself. When the DCS board is powered up, the FEEServer starts. The control engine is initialized and the FSM has the state STDBY. In this state only the DCS boards have power. All other parts of the chamber electronics including the MCMs and ORIs are still switched off. Since the DCS board has power, the sensors on the DCS board are already active and 52
TESTING (45) TEST 5 The FEEServer Control Engine OFF (4) START STANDBY (5) INITIALIZE INITIALIZING (42) STDBY_INITIALIZED (43) CONFIGURE CONFIGURING (44) CONFIGURED (3) READY (6) GO_READY GO_OFF GO_STANDBY INITIALIZE GO_CONFIGURED RESET ERROR (13) ANY STATUS Figure 5.3: State diagram of the frontend reaout electronics. Transitional states are marked with yellow background. The numbers in brackets are the official numbers of these states in the ECS of ALICE. 53
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Page 7: 1 Introduction The standard model o
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Block Class task Configuration hand
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Bibliography [A + 05] V. Angelov et
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Bibliography [Mah04] T. Mahmoud. De
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