Lenze DDS Function library Drive Manual de usuario descargar pdf (Pagina 16)

2.2.3 Input gain and offset (L_AIN)

Function library LenzeDrive.lib

Analog signal processing

2−6

LenzeDrive.lib EN 1.7

2.2.3 Input gain and offset (L_AIN)

This FB is preferentially used for addition circuitry at the analog input terminals, to adjust the gain and

offset.

nOffse t_ a

L_AIN

nOut_a

nGain_a

nIn_a

Fig. 2−4 Input gain and offset (L_AIN)

VariableName DataType SignalType VariableType Note

nIn_a Integer analog VAR_INPUT Input signal

nOffset_a Integer analog VAR_INPUT Offset of the input signal

nGain_a Integer analog VAR_INPUT Gain of the input signal

nOut_a Integer analog VAR_OUTPUT

Function

 Offset

– The value at nOffset_a is added to the value of nIn_a

– The result of the addition is limited to ±32767.

 Gain

– The limited value (after the offset) is multiplied by the value at nGain_a .

– Next, the signal is limited to ±32767.

 The signal is given out at nOut_a .

nOffset_a

nGain_a

nIn_a

nOut_a

Fig. 2−5 Offset and gain of the analog input

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Lenze DDS Function library Drive Manual de usuario Pagina 16