Integer scaler (only when using PDO SINT16)

The optional extended range "107%" has been introduced for Beckhoff analog channels in order to be able to measure slightly above the nominal full scale value (FSV_nom) of e.g. 20 mA for commissioning and diagnostic purposes (support depends on the device). Then the channel actually measures up to a defined technical full scale value FSV_techn which is slightly higher than the nominal full scale value FSV_nom.

The definition for 16 bits is as follows:

Fig.29: Defined resolution, 16-bit

Setting:

• Index 80nD:12 = Extended Range Range (default Einstellung)
  The channel measures up to the technical measuring range, which is approximately 107% of the nominal measuring range.
  For the extended range with 16-bit SINT PDO (16 bits + sign), the PDO value ±30518 (0x7736) has been defined as the nom. FSV = 100%. Accordingly, the displayable measuring range now extends to 0x7FFF = 32767 ~ 107.37% of the nominal measuring range.
• Index 80nD:12 = Legacy Range
  The channel measures up to 100% of the nominal measuring range.
  Accordingly, 0x7FFF = 32767 should be interpreted as 100% of the nominal FSV.

Fig.30: Setting Index 80nD:12, Legacy Range, Extended Range

Depending on the interface, this then means SINT16 -> Real32 for the conversion in the controller (if the over/underrange PDO is set to the default setting):

Measuring range ±20 mA (bipolar)

Fig.31: Measuring range ±20 mA (bipolar)

Measuring range 0...20 mA (current loop)

Fig.32: Measuring range 0...20 mA (current loop)

Measuring range 4...20 mA (current loop)

Fig.33: Measuring range 4...20 mA (current loop)

Measuring range 4...20 mA, NAMUR NE43 (current loop)

Fig.34: Measuring range 4...20 mA, NAMUR NE43 (current loop)