Description of CANopen-Interface
HYDAC ELECTRONIC GMBH
07.10.2010
Mat. No. 669824
Page 37 of 63
5 Installation / Preparation for start-up
The CANopen system is wired in bus topology with terminating resistors (120 ohms)
at the beginning and at the end of the bus line. If it is possible, drop lines should be
avoided. The cable is to be implemented as shielded twisted pair cable and should
have an impedance of 120 ohms and a resistance of 70 m /m. The data
transmission is carried out about the signals CAN-H and CAN-L with a common GND
as data reference potential. Optionally also the 24 V supply voltage can be carried.
In a CANopen network max. 127 slaves can be connected. The measuring system
supports the Node-ID range from 1-127. The transmission rate can be adjusted via
LSS-Protocol and supports the baud rates 20 kbit/s, 125 kbit/s, 500 kbit/s and
1 Mbit/s.
The length of a CANopen network is depending on the transmission rate and is
represented in the following:
Cable cross section
20 kbit/s
125 kbit/s
500 kbit/s
1 Mbit/s
0.25 mm
2
– 0.34 mm
2
2500 m
500 m
100 m
25 m
The
-
ISO 11898,
-
the recommendations of the CiA DR 303-1
(CANopen cabling and connector pin assignment)
-
and other applicable standards and guidelines are to be observed to insure
safe and stable operation!
In particular, the applicable EMC directive and the shielding and grounding guidelines
must be observed!
