Field Bus Interface

Interface socket 5-pin COMBICON
Transmission standard ISO 11898, potential-free
Transmission protocol CANopen® (CAN), 1 Mbaud max.
Transfer rate (baud rate) 20 kbit/s, 125 kbit/s, 250 kbit/s, 500 kbit/s and 1 Mbit/s

The CANopen® connector has the following pin assignment:

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Pin assignment of the CANopen® field bus interface, Combicon, 5-pole, male, Communication module interface

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Combicon, 5-pole, female, removable plug with spring terminals

Pin assignment:
Pin No. Signal Meaning
1 CAN_GND CAN reference potential
2 CAN_L Bus line, receive/transmit line, LOW
3 CAN_SHLD Shield of the bus line
4 CAN_H Bus line, receive/transmit line, HIGH
5 Not connected -

Cable Lengths

The maximum possible cable length of a CANopenâ network depends on the baud rate (transmission rate).

Bit Rate (speed) Bus Length
1 Mbit/s 30 m
800 kbit/s 50 m
500 kbit/s 100 m
250 kbit/s 250 m
125 kbit/s 500 m
62.5 kbit/s 1000 m
20 kbit/s 2500 m
10 kbit/s 5000 m

Types of Bus Cables

For CANopen®, only bus cables with characteristics as recommended in ISO 11898 have to be used. The requirements to the bus cables depend on the length of the bus segment. Regarding this, the following recommendations are given by ISO 11898:

Length of segment [m] Bus cable Max. baud rate [kbit/s]
 

Conductor cross section

[mm²]

Line resistance

[Ω/km]

Wave impedance

[Ω]

 
0…40 0.25…0.34 / AWG23, AWG22 70 120 1000 at 40 m
40…300 0.34…0.60 / AWG22, AWG20 < 60 120 < 500 at 100 m
300…600 0.50…0.60 / AWG20 < 40 120 < 100 at 500 m
600…1000 0.75…0.80 / AWG18 < 26 120 < 50 at 1000 m

Bus Terminating Resistors

The ends of the data lines have to be terminated with a 120W bus termination resistor. The bus termination resistor is usually installed directly at the bus connector.

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CANopen® interface, bus terminating resistors connected to the line ends

1 CAN_GND
2 CAN_L
3 Shield
4 CAN_H
5 Data line, twisted pair
6 COMBICON connection, CANopen® interface
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DeviceNet™interface, bus terminating resistors connected to the line ends

6 DeviceNet™ power supply
7 COMBICON connection, DeviceNet™ interface
8 Data lines, twisted pair cables
9 red
10 black
11 white
12 blue
13 bare

Note

The earthing of the shield should take place at the switch-gear cabinet, see System-Data AC500 System Data AC500.