About continuous execution

Feedback processing (when feedbacks are enabled)

• Get input Boolean values.

• Map input Boolean values to the corresponding configured state and set PVAuto state.

  • If PVMode==Auto, then PV=PVAuto

• If alarming, then calculate the alarms.

Command processing (when outputs are enabled)

• If command tracking is enabled, and command tracking input is true:

  • Set Cmd = PV (for PV in Active1, Active2 or Passive states)

  • Set Cmd = Null (for PV in Transition or Fault states)

• Else if Cmd write is pending (due to Cmd write request):

  • Write outputs to the field based on configured output values for state.

  • Remember command request time.

  • Set Cmd write issued flag.

• If PVMode is Simulate, then set PV equal to Cmd after the timeout period (if configured).

• If PVMode is not Simulate, and command tracking is disabled, then:

  • Detect uncommanded change alarm: PV not equal to Cmd.

  • If Cmd write issued flag is true, detect the command timeout alarm. If PV not equal to Cmd within timeout period.

Statistics processing (when statistics are enabled)

• Calculate the durations for the current time and total time that the discrete device was in the Active1, Active2, and Passive states.

• If PV has just changed to a new state, increment the counter for the new PV state.

• Detect the duration alarms for the Active1 state total duration and Active2 state total duration.