Commissioning
EL31xx-00xx
180
Version: 5.9
EL3174, EL3174-00xx scaler: extended range/ legacy range
The EL3174 or the EL3174-00xx terminal respectively has the scaler (AI Advanced settings Object
0x80nD:12 [
}
195]
) “Extended Range” default set. This type of scaling allows an exceeding of the positive or
negative value of approx. 7%. The technical useable range is within -107% to +107% of the respective full
scale value. Example: the full scale value is ±10 V, so the technical range is -10.7 V to +10.7 V. The Legacy
Range however provides the conventional range from -100% to +100% (e.g. usable range -10 V to +10 V)
and +100% correspond to +32767 (-100% to -32768).
For the Extended Range 100% of a 16 bit PDO value ±30518 (0x7736) have been defined. Therefore
resulting is the meaning of a bit given by the (user selected measurement range) respective full scale value
(FSV) as follows:
Diagrams of all measurement ranges are shown as follows:
Measurement range ±10 V (bipole):
Fig. 197: EL3174, EL3174-0002, EL3174-0090: measurement range -10…+10 V
