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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

Wiring for CAN bus

ATLAS

DCS

Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

can frame format
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

can bit segmentation
CAN bit segmentation

Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

propagation delay
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

round trip delay
Round-trip delay

Sébastien Franz PH-ATI-DC Stéphane Detraz PH-ESS

round trip delay6
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

signal reflection
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