The individual bytes of the Transmit PDOs (process data objects) of the EMF 2175 communication module contain sporadically shifted and wrong data when being operated in the CANopen mode

Which products are affected?
EMF2175IB communication module < FW1.3 in combination with 9300, Drive PLC and Servo PLC

What happens?
Sporadically shifted and therefore wrong data is sent in the individual user data bytes (byte 1-8) of the Transmit PDOs.

When does the problem occur?
The problem may sporadically occur when the value 0xAA exists several times in succession in one of the 8 user data bytes of a transmit telegram and in addition the EMF 2175 communication module is operated with node guarding.

Possible diagnostics?
The higher-level control receives sporadically shifted bytes and therefore wrong values from the CANopen station connected. As a result, the PLC program responds incorrectly.

Short-term measures/recommendations?
None.

Evaluation:
It is very improbable that the behaviour described before appears since the error can only occur if the value 0xAA is sent in several successive transmit telegrams. This is also confirmed by very few feedbacks received from the field.

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/200702841/1/