Data stream and measurement ranges

Measurement ranges

The diagrams at the bottom show the output values of the measurement ranges and the behavior if the limit ranges are exceeded.

EL3072, EL3074 Scaler: Extended Range/ Legacy Range

The EL3072 or the EL3074 has preset the scaling (Scaler, AI Advanced settings Object 0x80nD:12) "Extended Range". This type of scaling allows the actual measuring range to be exceeded or undershot by c.a. 7%. The technically usable range is therefore -107% to +107% of the respective full scale value. Example: full scale value = ±10 V then the technical measuring range is c.a. -10.7 V...+10.7 V. The Legacy Range, on the other hand, represents the conventional range from -100% to 100% (e.g. usable range -10 to +10 V) and +100% corresponds to +32767 (-100% -32768).

For the Extended Range the PDO value ±30518 (0x7736) has been defined as 100% for 16 bits. As a result, the bit meaning with the (user-selected measuring range) full scale value (FSV) is as follows:

The diagrams associated with all measuring ranges are shown below:

Measuring range ±10 V (bipolar):

Data stream and measurement ranges 2: — EL3072, EL3074; measuring range -10…+10 V

Measuring range 0...10 V (unipolar):

Data stream and measurement ranges 3: — EL3072, EL3074; measuring range 0…10 V

Measuring range ±20 mA (bipolar):

Data stream and measurement ranges 4: — EL3072, EL3074; measuring range -20…+20 mA

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

Data stream and measurement ranges 5: — EL3072, EL3074; measuring range 0…20 mA

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

Data stream and measurement ranges 6: — EL3072, EL3074; measuring range 4…20 mA

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

Data stream and measurement ranges 7: — EL3072, EL3074; measuring range 4...20 mA (NAMUR NE43)