Eaton XV-112, Руководство по эксплуатации

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5 Installation
5.3 Interfaces
MICRO PANEL XV-112 11/2011 MN04802005Z-EN www.eaton.com
31
Wiring

Shielded twisted pair cables must be used.
Tab. 11 Cable specifications

The maximum baud rate depends on the cable length:
Tab. 12 Relationship of cable length / baud rate
CAN bus topology

A bus segment can connect up to 32 bus stations.

Several bus segments can be linked via repeaters (bidirectional amplifiers). Refer to the documen-
tation of the repeater manufacturer for further information.

A bus segment must be provided with cable termination (120 Ω ) at both ends. These terminations
must be connected in the connector, directly between pin 2 and 7.
Cable specifications
Rated surge impedance 120 Ω
Permissible surge impedance 108…132 Ω
Capacitance per unit length < 60 pF/m
Core cross-section / max. cable length ≥ 0.25 mm
2
/ 100 m
≥ 0.34 mm
2
/ 250 m
≥ 0.75 mm
2
/ 500 m
Cable length Max. baud rate
25 m 1000 Kbit/s
50 m 800 Kbit/s
100 m 500 Kbit/s
250 m 250 Kbit/s
500 m 125 Kbit/s
500 m 100 Kbit/s (adjustable via software)
1000 m 50 Kbit/s
2500 m 20 Kbit/s
5000 m 10 Kbit/s


The use of repeaters is recommended with cables over 1000 m in length. Repeaters
can also be used to implement electrical isolation. Refer to the documentation of the
repeater manufacturer for further information.

Observe the recommendations of the CiA (CAN in Automation).

When preparing the cables, ensure that there is a low-resistance connection between
the cable shield and the connector casing (
→ Chapter 5.3.2,

23).


The bus segment must be terminated at both ends.

No more than two terminations must be provided on each bus segment.

Transmission faults can occur if operation is carried out without the correct termina-
tion.