Burkert Type 8640 - Manual (Page 53)

53
FELDBUSmoduleDeviceNet
Pin 2 of the power supply must be supplied with a 4 A medium time-lag fuse; Pin 4 with 1 A.
NOTE!
To ensure electromagnetic compatibility (EMC) connect the screw terminal FE (functional earth) to earth
potential using a short cable (30 cm).
11.1.2. IP20 field bus connection
For connecting the field bus a 9-pole D-SUB connection is used with the following pin assignment (plug in device,
socket on cable).
Pin No. Signal name
1 not used
2 CAN LOW
3 GND
4 not used
5 not used
6 not used
7 CAN HIGH
8 not used
9 not used
11.1.3. IP20 terminating circuit
When installing a DeviceNet system, ensure that the terminating circuit of the data lines is correct. The circuit pre-
vents the occurrence of interference caused by signal reflection in the data lines. The trunk line must be terminated
at both ends with resistors of 120 Ω each and 1/4 W power loss.
For the IP20 variant a terminal resistance of 120 Ohm between the two bus connections CAN High and
CAN Low can be added using a bridge in the 9-pole D-SUB field bus connection between pin 4 and pin 8.
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Type 8640