Moeller XION-PLC-CANopen, Оборудование, инженерия и описание функций, Страница: 15 / 54

02/05 AWB2724-1566GB
CPU functions
11
CANopen fieldbus interface
The XN-PLC can be connected to the CANopen bus through the
isolated ISO 11898 interface. The device can be operated as CAN
master or CAN device.
Power supply for CAN network stations
You can connect the power supply for the individual CAN stations
in any order.
Bus termination resistors
The ends of the network link must be terminated with 120 O bus
termination resistors:
Properties of the CANopen cable
Use only cable approved for CANopen applications and with the
following characteristics:
• Characteristic impedance 100 to 120 O
• Capacitance < 60 pF/m
The demands placed on the cable, connectors and bus termination
resistors are specified in ISO 11898. Listed below are a few
requirements and rules for CANopen networks.
table 4 lists default parameters for CANopen networks with fewer
than 64 CANopen stations.
Table 4: Standard parameters for CANopen network cable according to
ISO 11898
Figure 10:Pin assignment, CANopen
CAN H Non-inverted data signal (dominant high)
Shield Fieldbus screen connection
CAN L Inverted data signal (dominant low)
GND Chassis (optional for the CAN data signals)
Figure 11: Possible configuration of a CANopen bus with bus
termination resistors
a Screen
CAN H
SHIELD
CAN L
GND
CAN H
120
O
CAN L
CAN H
120
O
CAN L
GND GND
a a
Bus length Loop re
sistance
Conductor cross-section Bus ter
m
inat
ion
resistor
Tran
sfer rat
e
at c
a
ble le
ngt
h
[m] [mO/m] [mm
2
] [O] [kbit/s]
0 – 40 70 0.25 – 0.34 124 1000 at 40 m
40 – 300 < 60 0.34 – 0.6 150 – 300 > 500 at 100 m
300 – 600 < 40 0.5 – 0.6 150 – 300 > 100 at 500 m
600 – 1000 < 26 0.75 – 0.8 150 – 300 > 50 at 1000 m