BUS datasheet(11/42 Pages) BURKERT

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Type büS

Getting to know the basics of a büS

infrastructure – accessories, cables,

pin assignment

4.2.4

Termination

Definition: A termination resistor is available as an M12 connector (female and male) or as a chip and has to

be used twice in one network.

Purpose: To avoid signal reflections in the cable, the büS network always needs to be terminated with two

120 Ω resistors at the ends of the cable. One is required at the beginning of the network and one at the end.

Bürkert Id Nr

772424

Fig. 6: Termination

Fig. 7: Termination resistor chip

4.3

Cable configuration

There are two types of cable: connecting cables and extension cables. All cables are available with different

cable lengths. An overview can be found in the appendix.

4.3.1

Characteristic impedance and cables standards

All nodes are connected to each other through a physically conventional two-wire bus. The wires are a twis-

ted pair with a 120 Ω (nominal) characteristic impedance. CiA 301 (CANopen application layer) is standard-

ised as EN 50325-4.

4.3.2

Connecting cables

Definition: Connecting cables are equipped with a female M12 connector on one side and with open leads

on the other.

Purpose: These cables connect a device with a terminal block to an M12 connector, e.g. gateway Type

ME43.

4.3.3

Extension cables

Definition: Extension cables are equipped with a female M12 connector on one side and with a male M12

connector on the other.

Purpose: These cables are used to connect a device with an M12 connector.

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