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Transfer pressure values with units of inches of water between I/NET and LON with a 913/527/731.

Issue

Transfer pressure values with units of inches of water between I/NET and LON with a 913/527/731.

Environment

I/NET

Xenta 913/527/731

XBuilder

Cause

When reading pressure from LON, the value is always in metric units, Pascals, on the LON wire. When the value comes into I/NET, it will be a large, unexpected number.

Resolution

To read in a LON pressure value into I/NET:

  1. Create two internal points in I/NET.
    1. AO to receive the raw pressure value in Pascals
    2. AI to perform the conversion to inches of water
  2. Add a calculation to the AI to perform the conversion: P0*C0
    • P0 = AO created to receive the raw pressure value in Pascals
    • C0 = 0.004 to convert value from Pascals to inches of water
  3. Set the connection object in XBuilder:
    • From = LON SNVT_press
    • To = AO to receive the raw pressure value
    The AI should be reading the correct value in units inches of water.

To write a setpoint value out of I/NET to LON:

  1. Create two internal points in I/NET:
    1. AO where the user enters desired static setpoint in inches of water
    2. AO to perform the conversion to Pascals
  2. Add a calculation to the AO to perform the conversion: P0*C0
    • P0 = AO created to enter desired static setpoint in inches of water
    • C0 = 249 to convert value from inches of water to Pascals
  3. Set the connection object in XBuilder:
    • From = AO to perform the conversion
    • To = LON SNVT_press
    The SNVT should be reading the correct value in desired units.
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