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I've done a fair amount of looking. Codesys doesn't seem to have a library that easily supports sending and receiving of SDO messages greater than 4 bytes.
Is this true, or is there a library I'm unaware of?
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Yes that seems correct to me. I have a library that I assume is written by my PLC vendor that allows reading/writing segmented SDO's. I personally haven't tried them yet. I would be happy to share them with you if they work in your system but I would also assume that the library would be hardware independent. There are two separate function blocks SDO_READ_NET.lib and SDO_WRITE_NET.lib. One function block in each library. Now the only thing I would guess is if you already have a node configured via the 3S CANOpen Stack in the PLC configuration I am not confident that this block will send or receive anything because the CANOpen stack may interrupt it first? I don't have any documentation on the library. Let me know if you want to try it.
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Originally created by: jking222
I've done a fair amount of looking. Codesys doesn't seem to have a library that easily supports sending and receiving of SDO messages greater than 4 bytes.
Is this true, or is there a library I'm unaware of?
Yes that seems correct to me. I have a library that I assume is written by my PLC vendor that allows reading/writing segmented SDO's. I personally haven't tried them yet. I would be happy to share them with you if they work in your system but I would also assume that the library would be hardware independent. There are two separate function blocks SDO_READ_NET.lib and SDO_WRITE_NET.lib. One function block in each library. Now the only thing I would guess is if you already have a node configured via the 3S CANOpen Stack in the PLC configuration I am not confident that this block will send or receive anything because the CANOpen stack may interrupt it first? I don't have any documentation on the library. Let me know if you want to try it.