PDI status and parameters

Use the
General
 tab of the
PDI Properties
 dialog box to monitor the status and set parameters for Process Discrete Input (PDI) instructions.
To monitor the status and set parameters for PDI instructions
  1. On the instruction in the routine, perform one of these actions:
    • On the Ladder or FBD instruction, select .
    • In the Structured Text editor, right-click the tag name and select
      Configure <tag name>
      .
  2. Open the
    General
     tab.
  3. Set the parameters:
    • Device.
       Select the physical or virtual device providing the PV value.
    • Virtual PV.
       Select the
      On
       or
      Off
       option to set the state of the input from virtual device. Configure the
      On
       and
      Off
       labels in the
      HMI
       tab.
    • Maintenance substitution.
       Change the PV source when the device providing the PV value is in maintenance. The button shows the alternative PV source. By selecting the button when
      Use substitute PV
       is displayed, the substitute PV value is used in calculations. By selecting the button when
      Use input PV
      is displayed, the input PV/virtual PV value is used in calculations depending on the status of the PDI instruction. The action is immediate, no need to select
      Apply
       to confirm.
    • Substitute PV.
       Select the
      On
       or
      Off
       option to set the maintenance-entered substitute PV that overrides Input PV when maintenance substitution is selected. If substitution is configured to follow the PV target, the input target will be used as the substitution value, rather than the maintenance entered value. Configure the
      On
       and
      Off
       labels in the
      HMI
       tab.
    • Debounce time.
       Enter the value (in seconds) of the minimum time the PV status must maintain the state.
    • PV target.
       Select the
      On
       or
      Off
       option to set the target state of the input. Configure the
      On
       and
      Off
       labels in the
      HMI
       tab.
    • Gate delay.
       Enter the value (in seconds) of the Target disagree gate delay time.
    • Target disagree.
      • On delay.
         Enter the value (in seconds) of the Target disagree on delay time.
      • Off delay.
         Enter the value (in seconds) of the Target disagree off delay time.
  4. View the read-only parameters:
    • Device state
      . When the
      Logix Designer
       application is online with the controller, the indicator displays the current device state, such as Off, Pulse on, or Out of service.
    • Device issues
      . When the
      Logix Designer
       application is online with the controller, the indicator displays fault conditions, such as Feedback fault or I/O fault.
  5. Select
    Apply
    .
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