"Bus error: an error counter reached the 'heavy'/'warning' limit" with Elobau Canopen angle sensor

[Topper69]

Hi,

I'm trying to read & configure Elobau canopen angle sensor with a Peak PCAN-USB FD reader.
Wiring :
DEUTSCH Sensor connector --- PEAK
PIN 1 GND
PIN 2 +12V power supply
PIN 5 (can L) --- CAN L
PIN 6 (can H) --- CAN H
120Ohm between pin 5&6.

OS : Windows 10 64b + python3.10.2
Example python sketch:

import canopen
network = canopen.Network()
network.connect(bustype='pcan', channel='PCAN_USBBUS1', bitrate=250000)
##green light is flashing
network.scanner.search()
##error : Bus error: an error counter reached the 'heavy'/'warning' limit
##Peak is flashing red

Any clue what's going on?

Many thanks.

[af-silva]

Hi @Topper69,

PCAN_ERROR_BUSHEAVY: Indicates a bus error within the given PCAN Channel. The hardware is in bus-heavy status

It can a number of things related to Network:

• Is the bus correctly terminate? (I will assume yes since you mentions the resistor);
• Are you using the correct bitrate for the given adapter?;
• How many devices do you now on the bus, one? or more? if more they are all configured equal, this is with the same bitrate?
• Do you have the drives updated or using the correct/recomended version?
• Have you tried, using candump and cansend to try communicate with the device beforehand and check if the connection is ok?

Please check the forums and documentation from Peak -> BUSLIGHT, BUSHEAVY & BUSOFF

In the past I have used SockectCan to connect but I was on linux.

Have you tried this -> network.connect(bustype='pcan', channel='PCAN_USBBUS1', state=BusState.ACTIVE, bitrate=500000) ( from the python-can documentation here )

Good luck ;)

[Topper69]

Bad wiring ;) working good now (i have mirrored the wiring).
Closed the issue.
Many thanks for the help.