Open Wire Detection

Open Wire detection detects when a wire is disconnected from the channel. For 5034-IF4/IF8C/IF8V module, to enable Open Wire detection, go to Channels → Chxx view in Module Properties and select Enable Open Wire Detection checkbox. For 5034-IRT4I module, Open Wire detection is always enabled.
For 5034-IRT4I module, the value that is reported during an Open Wire detection depends on the Diagnostics selection (minimum/maximum engineering) on the channel. See Chxx View to set the diagnostic condition.
Open Wire Conditions - 5034-IF4, 5034-IF8C, and 5034-IF8V Modules
Mode
Cause of Detection
Resulting Module Behavior
Current (mA)
The input signal for a channel is below 92 μA.
  • The
    I:Chxx.OpenWire
     tag changes to 1.
  • A fault occurs and the
    I:Chxx.Fault
     tag is set to 1.
  • The
    I.Chxx.Underrange
     tag set to 1.
Voltage (V)
The input signal value is above 11V.
  • The
    I:Chxx.OpenWire
     tag changes to 1.
  • A fault occurs and the
    I:Chxx.Fault
     tag is set to 1.
  • The
    I.Chxx.Overrange
     tag set to 1.
Open Wire Conditions - 5034-IRT4I Module
Mode
Cause of Detection
Resulting Module Behavior
RTD
A wire is disconnected from the channel.
  • Input data for the channel changes to Maximum/Minimum Engineering value depending on the configuration of parameter Input Value During Open Wire.
  • The
    I:Chxx.OpenWire
     tag changes to 1.
  • The
    I.Chxx.Overrange
     or
    I.Chxx.Underrange
     tag may be set to 1 based on the configuration of parameter Input Value During Open Wire.
  • A fault occurs and the
    I:Chxx.Fault
     tag is set to 1.
Thermocouple
IMPORTANT:
The Disable All Alarms feature does not disable the Open Wire detection feature but it disables all alarms on the module.
The Open Wire detection feature is not an alarm. It is an indicator that a wire has been disconnected from the channel but does not trigger an alarm.
For 5034-IF4, 5034-IF8C, and 5034-IF8V modules, to disable the Open Wire detection feature, you must clear the Enable Open Wire Detection checkbox in the Chxx view.
For 5034-IRT4I module, open wire detection is always enabled. You can disable the channel if it is not in use.
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