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Thread: What’s the reason for freezing the value of dynamic element?

  1. #1
    shahramkh59 Gast

    Default What’s the reason for freezing the value of dynamic element?

    What’s the reason for freezing the value of dynamic element?
    One problem has been occurred in my project,as when I disconnect the plc connection to PC(disconnect the communication connection) the values of dynamic element is freezed in latest value that has seen in dynamic element instead of zero value.
    whether there is a way to see zero value (videlicet numerical value) when connection is disrupted.
    connecting protocol is MODBUS.

  2. #2
    Join Date
    01.07.2008
    Location
    Salzburg, AT
    Posts
    808

    Default Re: What’s the reason for freezing the value of dynamic element?

    By lost of communication to PLC, zenon shows last value (as no new value is coming). But the variables receive a status bit - invalid - so called I-Bit.

    The simplest way to show a communication lost on a picture element linked with a variable is activate the element property "Display status with red square".

    If a red square on picture element is not sufficient for you, you can also define in your dynamic element a state detecting I-Bit and change the way you are showing it, use some special colors, text or graphic.
    You can also e.g. detect I-Bit using Reaction matrix and turn your variables to alternative values kept on 0, but it's more complicated as just to let signal I-Bit by this red square in element corner.

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