Gateway. Burk 8681

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Type 8681 büS/CANopen büS/CANopen-Design

• Each gateway can control up to 63 nodes (Control Heads Type 8681 büS/CANopen) if the network topology considers the max. permitted cable length and the required power supply. Each node requires a unique “Node ID”, otherwise an error occurs.

• The max. total line length is 200 m for 125 kbit/s, 100 m for 250 kbit/s, 40 m for 500 kbit/s.

• The max. cable length for a single drop line is 6 m, the max. total length of all drop lines in the network is 100 m for 125 kbit/s, 55 m for 250 kbit/s, 30 m for 500 kbit/s.

• If the voltage drop is too large, an additional power supply can feed in at a CAN junction box (PWR

IN connection). In this case, connect CAN ONLY to CAN IN using a CAN cable .

This cable (which interconnects the CAN junction boxes at “CAN ONLY” and “CAN IN”) cannot be used for T-connectors to branch “nodes” because no power is supplied to this cable (compare example

3 in chapter “8”).

• Unused or open connections must be closed with the appropriate protective caps.

• Required tightening torque for all plug-in connections (cables, T-pieces, ...) to ensure the required leak-tightness against moisture: 0.6 Nm + 0.1 Nm.

• The CAN cable must be “terminated” at both ends: connect a terminating resistor (120 ohms) to the end of the CAN cable / T-connector or, if the line ends with a CAN junction box, connect the terminating resistor to the CAN OUT connection.

• For service work and also when reading out CAN data, a PC with Bürkert Communicator Type 8920 can be connected to any free connection at the CAN junction box or to the CAN ONLY connection.

A büS stick is necessary to connect the PC to the CAN network.

• T-connectors can be used to connect single “nodes” or a PC to read out the CAN data (via Bürkert

Communicator).