This interface is the connection to a processor module with onboard CAN e.g. PM56xx-2ETH.
|
Interface socket |
COMBICON, 5-pin, female, removable plug with spring terminals |
|
Transmission standard |
ISO 11898, potential-free |
|
Transmission protocol |
CANopen (CAN), 1 Mbaud max. |
|
Transfer rate (transmission rate) |
50 kbit/s, 100 kbit/s, 125 kbit/s, 250 kbit/s, 500 kbit/s, 800 kbit/s and 1 Mbit/s, |
Pin assignment
|
Interface |
PIN |
Signal |
Description |
|
|---|---|---|---|---|
 Terminal block removed |
 Terminal block inserted |
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 |
NC |
Not connected |
||
NOTICE
Unused connector!
Make sure that the terminal block is always connected to the terminal base or communication module, even if you do not use the interface.
Bus length
The maximum possible bus length of a CAN network depends on bit rate (transmission rate) and cable type. The sum of all bus segments must not exceed the maximum bus length
|
Bit Rate (speed) |
Bus Length |
|---|---|
|
1 Mbit/s |
40 m |
|
800 kbit/s |
50 m |
|
500 kbit/s |
100 m |
|
250 kbit/s |
250 m |
|
125 kbit/s |
500 m |
|
50 kbit/s |
1000 m |
Types of bus cables
Only bus cables with characteristics as recommended in ISO 11898 are to be used. The requirements for the bus cables depend on the length of the bus segment.
Bus terminating resistors
Both ends of the CAN bus have to be terminated with a 120 Ω (≥ 1/4 W, ≤ 5 %) bus terminating resistor, to minimize signal reflection. The bus terminating resistor should be connected directly at the bus connector between the CAN signals (CAN_H and CAN_L).