PM511V08 3BSE011180R1 | ABB | Diagnostic display bus load module

Description

PM511V08 3BSE011180R1 | ABB | Diagnostic display bus load module

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PM511V08 3BSE011180R1 diagnostic method: Use Hongke PCAN View or handheld diagnostic instrument to display the bus load rate

/Solution/

1. Reduce messages

2. Extend the message sending cycle,

3. Increase bus baud rate

4. If using CAN2.0, we can consider using CAN FD in the future

Terminal resistance error

The PM511V08 3BSE011180R1 high-speed CAN bus (ISO 11898-2) must have a 120 Ω terminal resistor connected at both ends of the CAN line (between CAN-L and CAN-H). This is beneficial for reducing signal reflection in cables and ensuring that CAN transceivers can function properly
1. Measure the terminal resistance between CAN-L and CAN-H using Hongke PCAN-Diag FD.

2. Experienced users can evaluate the terminal resistance by using the waveform shape on the PCAN Diag FD oscilloscope (observing wing ringing, etc.)

Below, we will take a look at the waveform characteristics under different terminal resistances:

① Terminal resistance situation 1: Overload Over termination

Overload cause: Too many terminal resistors connected

The normal parallel connection of two 120 ohm terminal resistors should be around 60 ohms, as shown in the figure below, it is 13 ohms, causing distortion of the CAN waveform.

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