Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual - Manual (Page 15)

Publication 1760-UM003A-EN-P - September 2005
Installation 2-3
All pins of the plug must be connected to ensure safe communication
of the
1760-DNET on the fieldbus DeviceNet. This also applies to the
24V bus voltage.
Terminating Resistors
The first and last node of a DeviceNet network must be terminated by
means of a 120
O bus termination resistor. This device is
interconnected between the CAN_H and CAN_L terminals.
EMC Compatible Wiring Electromagnetic interference may lead to unwanted effects on the
communications fieldbus, which can be significantly reduced by using
the cable described above, a shielded RJ45 connector and by
terminating the screen.
The two figures below show the correct termination of the shielding.
Figure 1.3 Shield Connection to the Mounting Rail
IMPORTANT
The gateway does not participate in communication
on the bus if the bus voltage is not available. The
Network status LED is OFF in this situation.
0 1 n . . .
R
T
R
T