Read Scale

This service can be used to determine the scaling of a parameter. The inverter provides a so-called measurement index and a conversion index.

Byte 4

Byte 5

Byte 6

Byte 7

MSB data

Data

LSB

LSB data

Reserved

Quantity index

Conversion index

Quantity index:

The quantity index is used for coding physical values. This index provides a communication partner with information about which physical quantity is involved with the corresponding parameter value. The values are coded according to the sensor/actuator profile of the PROFIBUS user organization (PNO). The entry FFhex means that no measurement index is specified. You can also gather the measurement index from the parameter list of the inverter.

Conversion index:

The conversion index is used for converting the transmitted parameter value into a basic SI unit. The values are coded according to the sensor/actuator profile of the PROFIBUS user organization (PNO).

Example:

Drive parameter:            P131 ramp t11 down CW

Measurement index:               4 (= time with second as measurement unit)

Conversion index:          3 (10-3 = milli)

Transmitted numerical value:  3000dec

The frequency inverter interprets the numerical value received via bus as follows: 3000 s × 10-3 = 3 s