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<< Click to Display Table of Contents >> Trend Chart Tolerance Bands |
  
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<< Click to Display Table of Contents >> Trend Chart Tolerance Bands |
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Setting up tolerance bands on a trend chart pen (max & min allowable values) can be done in the following ways:
| • | Warning 'flashing' of the pen line on a Trend Chart when out of range using the Blink on Alarm from box on the Pen Properties setup box |
| • | Warning flashing using Color Dynamics |
| • | Warning messages using Position Dynamics |
| • | Ramp/Soak controllers have a Working Setpoint, so plotting the Working Setpoint on the chart can be used to indicate a tolerance band. This can be done with User Variables that have been set using the Strategy Controller to the Working Setpoint plus or minus a tolerance |
| • | If the upper and lower limits don't change during the process then simply plotting 2 User Variables on the Trend Chart that contain the upper and lower values will visually show if the reading goes out-of-range. |
For determining if a value is 'in-range' in order to e.g. send an email, there is some Strategy that will need implementing to do range-checking.