Process value (PV) and signal value (SV) pairs are analogous to the slope and intercept in APOGEE. PV/SV pairs can be found in an application team's properties or can be calculated manually for users that want to change their units.

  • A P1 TEC device object has been created.
  1. Go to Field bus.
  1. Expand a P1 Fln view node.
  1. Click on the P1 TEC structured view object.
  1. In the P1 TEC's properties, click Data point definition.
  • A list of P1 subpoints and definitions will display.
  1. Locate the desired point in the list.
  • The definition will display the process values (PV1 and PV2) and the signal values (SV1 and SV2).

①

PV1 and PV2 have two values. Each value represents a different unit type: US System of units and Internat. system of units (SI), respectively. For a device that has been configured to use the US System of units, write the first value for PV1 (48.000) and PV2 (111.750). For a device that has been configured to use the Internat. system of units (SI), write the second value for PV1 (8.890) and PV2 (44.4590).

②

PV1 and PV2 have one value each. In this example, the unit type is percentage, which is the same in both systems of units. In this example, you would write 0 for PV1 and 102 for PV2, regardless of the configured system of units.

③

SV1 and SV2 have one value each, are based on the physical value of the point, and have no unit type. SV1 should always be 0. SV2 represents the physical range of the point.

Manually calculating process value and signal value pairs

Users can manually calculate process value and signal value pairs if they want to change their units. To do so, determine the range of the new unit and the range of the signal.

For example, the native units of a voltage point range from 0 to 10 volts. By default, the PV/SV pairs are 0 and 1. If the units were changed to percentage, the process values would represent the range of the new unit, 0 to 100. The signal values would represent the range of the volts, 0 to 10. Therefore, the new PV/SV pairs for in new units would be PV1[0];PV2[100] and SV1[0];SV2[10].