ITEM C 3-Series, Product Manual

Page: 102 / 160

Electrical installation
Page 102

The individual nodes of the network are always connected in line so that the CAN cable is looped through from controller
to controller (see
Figure 25)
.

A terminating resistor of 120 Ω ± 5% must be present on both ends of the CAN bus cable. The item Servo Positioning
Controller C 3-Series is equipped with an integrated terminating resistor that can be activated/deactivated via the DIP
switch "CAN TERM" on the front panel (see
Figure 26
).

Shielded cables with exactly two twisted pairs must be used for cabling.

Use one twisted pair to connect CAN-H and CAN-L.

The cores of the other pair are used jointly for CAN-GND.

The shield of the cable is connected to the CAN shield connectors for all nodes.

For information about suitable and item-recommended cables, refer to
chapter 8.10.4, Cable type and configuration [X4]
.

We advise against the use of plug adaptors for cabling the CAN bus. However, if this is necessary, use metal connector
housings for connecting the cable shield.

In order to keep interferences as low as possible ensure that

the motor cables are not installed parallel to signal lines

the motor cables comply with the item specification

the motor cables are properly shielded and earthed (grounded)

For further information on interference-free CAN bus cabling, please refer to the Controller Area Network protocol
specification, version 2.0, by Robert Bosch GmbH, 1991.
integrated
terminating resistor
120
Ω
X4, Pin 7
(CAN-H)
X4, Pin 2
(CAN-L)
DIP switch
CAN TERM
Figure 26: Integrated CAN terminating resistor