34 Electrical installationAC and DC parameters for the CANopen network Bus cable and termination resistorsThe cables, connectors, and termination resistors used inCANopen networks must meet the requirements specified in ISO11898.The table below lists the standard values for DC parameters forCANopen networks with less than 64 nodes:With drop cables the recommended cable cross-section is0.25…0.34 mm 2.In addition to the cable resistance, the real resistance of theconnectors should be taken into account in voltage dropcalculation. The transmission resistance of one connector shouldbe 2.5...10 mohm.The following table lists the maximum bus cable length for differentnode numbers (n), when• minimum dominant value Vdiff.out.min = 1.5 V• minimum differential input resistance Rdiff.min = 20 kohm• requested differential input voltage Vth.max = 1.0 V• minimum termination resistance RT.min = 118 ohm.Bus length[m]Bus cable1) Terminationresistance[ohm]Baud rate[kbit/s]Length-relatedresistance[mohm/m]Cross-section[mm 2 ]0…40 70 0.25…0.34 124 1000 at 40 m40…300 < 60 0.34…0.6 150…300 > 500 at 100 m300…600 < 40 0.5…0.6 150…300 > 100 at 500 m600…1000 < 26 0.75…0.8 150…300 > 50 at 1 km1) Recommended cable for AC parameters: 120 ohm impedance and 5 ns/m line delay
