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Wiring for CAN bus

Wiring for CAN bus. ATLAS DCS. CAN frame format. Arbitration occurs during the identifier field and implies that multiple nodes simultaneously drive their identifier bits onto the bus. CAN bit segmentation. Propagation delay. SOF bit. 1 st IDENTIFIER bit.

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Wiring for CAN bus

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  1. Wiring for CAN bus ATLAS DCS Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  2. CAN frame format Arbitration occurs during the identifier field and implies that multiple nodes simultaneously drive their identifier bits onto the bus Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  3. CAN bit segmentation Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  4. Propagation delay SOF bit 1st IDENTIFIER bit The bit transmitted by node B must arrive at node A before the start of Seg1. This condition defines the length of the Prop_Seg. Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  5. Round-trip delay Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  6. Round-trip delay Tloop_trc: transceiver loop delay Tloop_cont: controller (+optocoupler) delay Tbus: bus propagation delay Round trip delay = 2*(Tloop_trc+Tloop_controller+Tbus) Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

  7. Signal reflection • CAN signal noise margin • Nominal bus levels according to ISO 11898 But can be between -500mV & +50mV Dif. Voltage = 0V but can be between 1.5V & 3V 2V Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

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