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  • Hi all,

    Have a new and exciting problem with M2M2 with regards to continuity of data.

    Ive got a 5 devices in a daisy chain. Controller->Power Peter->3x I/O Modules to Rs485/LAN gateway that M2M2 polls from. This should work just fine. The unit beside it doesnt have a problem.

    Now, the problem seems to be data collisions. my sampling intervals are 5 seconds and at the end of every other interval a non-zero value (lets say discharge temperatures) just cuts down to zero and then picks up to the "proper" value after the next 5 seconds.

    The baudrates of the devices are all 19200, everything is setup properly as far as I can tell.

    I dont understand why this is different than the time I did this before...any ideas?

    Thanks,

    Jonathan


  • Not sure what you mean by data collisions. Do you think this is a problem with Modbus? You're using Modbus, right? If so, you could enable I/O logging and see if that help troubleshoot the problem.


  • This is a pic of what Im experiencing. And its only 2 points (OD outlet and discharge temp). The other 13pts work fine.

    I dunno if this helps or not.

    Jonathan

    Attachment: download link


  • How do I enable I/O logging?

    Also, does the "point value may not be reliable" have anything to do with it?

    Jonathan


  • You need at least 1.13.0 to do I/O logging with Modbus. Your other possibility is to set a discard low limit on the point that is > 0, but then you'll only be getting 10 second updates.