PAO output pulsing mode and values

Use the
Positioning
 tab of the
PAO Properties
dialog box to monitor the instruction status in output pulsing mode and to set the parameter values for the Process Analog Output (PAO) instruction.
To monitor the instructions status in output pulsing mode and set parameter values for PAO 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. Select the
    Positioning
    tab.
  3. Set the parameters:
    • Deviation (actual position minus target position)
      .
      • High limit.
         High limit for deviation (actual position minus target position) alarming (engineering units).
      • Low limit
        . Low limit for deviation (actual position minus target position) alarming (engineering units).
      • Delay
        . Period of time the deviation condition must hold before the deviation status is set to minimize false alarms (seconds).
    • Device pulsing parameters
      .
      • Cycle time
        . Period of time for a pulse to repeat (seconds).
      • Max On time
        . The maximum duration allowed for a pulse (seconds).
      • Min On time
        . The minimum duration allowed for a pulse (seconds).
      • Dead time
        . Dead time of a device/actuator the instruction will compensate for when generating pulses (seconds).
      • Opening rate
        . Rate of a device/actuator when opening (engineering units/second). The rate is used in pulse duration calculation. The rate is also used for estimating the actual position when feedback from the device position or limit switch is not available.
      • Closing rate
        . Rate of a device/actuator when closing (engineering units/second). The rate is used in pulse duration calculation. The rate is also used for estimating the actual position when feedback from the device position or limit switch is not available.
    • Bump.
      • Open
        . Request the device to open in one shot. The button is enabled when the device is online. The request is immediate if no confirmation is required or waits for confirmation if the instruction is configured to do so. The button is disabled when the instruction is not configured for device pulsing or when security is enforced, and the operator command requires confirmation with eSignature.
      • Close
        . Request the device to close in one shot. The button is enabled when the device is online. The request is immediate if no confirmation is required or waits for confirmation if the instruction is configured to do so. The button is disabled when the instruction is not configured for device pulsing or when security is enforced, and the operator command requires confirmation with eSignature.
      • Bump time
        . User setting of a pulse duration applied when the device is switched to open or close in one shot by the operator (seconds).
  4. View the read-only parameters:
    • Desired value.
      Desired CV value calculated by the instruction (engineering units).
    • Actual value.
      Actual device confirmed value (position) provided by the feedback, if available, or value calculated by the instruction as a virtual feedback, if the device does not provide its position (engineering units).
    • Deviation.
      Value calculated by the instruction as a deviation, difference between desired and actual device position (engineering units).
    • Deviation status
      . Text description of current status of deviation.
    • Action
      . Device bump action in progress, if any.
    • Pulse output.
       Status of pulse outputs as a text string.
    • 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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