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Ash Neilson

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Blog Comments posted by Ash Neilson

  1. Simon,

    I think Phil is the only one who can delete the duplicate comment :D

    As far as the Loop side of things goes. In my experience of using them, I found they would simple "Add the Scan" if you were "Jumping Back" to a Label.

    If you make a Loop take too long to complete, you can trigger a "Software Watchdog" error, which means the PLC Scan never actually finished within a reasonable time.

    I just made a quick test program and added an INC Utility in Net 1, made a Label with another INC Utility in Net 2, then in Net 3 a "Jump to Label" so it would jump "Back to Net 2". I also added a INC Utility in Net 4.

    When I started the PLC Program, the INC in Net 1 counted up just once, then the MI on the INC Utility in Net 2 was counting up very fast - then I hit a Watchdog Timeout because my loop "Never Ended".

    So based on this one thing to remember would be Inputs and Outputs won't be updated whilst in a "Loop" of Label Jumping.

    Very handy, but dangerous feature at the same time! :D

  2. Nice blog entry Saragani!

    I have been looking at using the SD Card as a way to store history for MI / ML values, then transfer them from the SD Card to a remote server for graphing :D

    I just noticed that the latest SD Card Suite uses a version 1.0.0.31 of the Unitronics.ComDriver looking at the properties off the DLL. Are you planning on updating the available Source Code + DLL from the downloads section any time soon?

    Looking forward to the next blog entry!

  3. How about Unitronics offering;

    Profibus RTU serial Protocol as well as Profinet

    I was more thinking down the lines of Computer software to compliment or "Enhance" the Unitronics OPLC range.

    But since you brought it up, what is your reason for having Profibus or Profinet implemented in a Unitronics PLC? I find between Modbus, CANbus, CANopen, Unitronics Protocols and the ability to do a Raw Serial or Ethernet protocol - that I never come unstuck trying to talk to something!

    Basically everything on the face of this earth that is related to PLC's / Automation supports Modbus, CANbus or CANopen :D

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