Pixsys Forum

Hi,

I have a big problem with CANOpen Master on TD700.

We have PLCs in a CANOpen network configured as slaves.
They discuss in CAN SDO (PDO is not supported on PLCs).

We use your SDO function declared on the LogicLab (CAN_Read_SDO_WORD, CAN_Write_SDO_WORD) and everything is OK (the data read is OK)

The big problem is : as our PLCs can make SDO requests between them, if one our PLCs make a SDO request on another of our PLCs, the application on the TD700 crashes ! (Applicaton LLexec.exe encountered a serious error and must shut down).

Is the TD700 can support CANopen Slave ?

Thank you

Eric

Hi,
TD700 can only be MASTER. If your PLCs communicate together, probably one of them is Master. Can protocol allow only one master per bus.

No my PLCs are all slaves and they can comunicate in both ways

If one of them make a SDO request the TD700 crashes

TD700 crashes because it cannot be slave. It can only be master.

Ok but I thought CANOpen devices were both Slave and master at the same time.

Hi,

So TD700 cannot just use SDO functions without being Master ?

It would be cool that TD700 could be a client or server with a node ID like Danfoss PLCs.

Eric

Sorry, TD700 cannot be slave.
Also it cannot use SDO function because they work only if it is set as master.