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:

Integer scaler (only when using PDO SINT16) 1: — Fig.26: Defined resolution, 16 bit

Notice

Invalid error limits following a change to the “Integer Scaler”

If the “Integer Scaler” parameter is changed, the error limits (“Range Error”) are not automatically updated. As a result, measured values may be incorrectly interpreted as invalid or valid after a change.

After each change to “Integer Scaler”, also set the parameter “Input Interface”.
Changing the “Input Interface” sets the correct error limits, taking into account the configured “Integer Scaler”.
If the “Input Interface” is already set correctly when you change the “Integer Scaler”, you must temporarily set the “Input Interface” to a different value and then reset it to the correct value.

Setting:

Index 0x80nD:12 = Extended Range (default setting)
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 nominal FSV = 100%. Accordingly, the displayable measuring range now extends to 0x7FFF = 32767 ~ 107.37% of the nominal measuring range.
Index 0x80nD: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.

Integer scaler (only when using PDO SINT16) 2: — Fig.27: Setting Index 0x80nD: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)

Integer scaler (only when using PDO SINT16) 3:

Measuring range 0…20 mA (current loop)

Integer scaler (only when using PDO SINT16) 4:

Measuring range 4…20 mA (current loop)

Integer scaler (only when using PDO SINT16) 5:

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

Integer scaler (only when using PDO SINT16) 6: