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Siemens spc zone reading null

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  • 17-09-2015 3:44am
    #1
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭


    What does it mean when a zone on a Siemens spc panel is reading back a (null) value in the log? Is it just the resistance is somewhere between open and closed? Or something different?


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    #2
    kub
    Registered Users Posts: 6,546 ✭✭✭kub


    If you have dual end of line resistors on that particular zone, then it cannot see the value of those resistors therefore you have an open tamper condition.


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    #3
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    Ahh ok, so its an issue with the tamper switch/circuit. There was two sensors on that zone and I split each onto a separate zone. So its either a break on one of the wires form the panel or at the tamper switch.

    I'm quite new to the Europlex/SPC, so i would of thought a "Tamper" would of been thrown like the other systems i've seen.


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