You should be isolating your SCADA from your control logic.
You should NOT rely upon the SCADA to perform control functionality, it decreases the reliability of the overall system, and complicates diagnostics.
The recommendation would be to push the High High Setpoint into the PLC, and allow it to be changed from SCADA. The PLC will then do the comparison between the PV and the High High SP, and perform the control action based upon this.
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