Automation and Drives - SCE
T I A Training Document Page 137 of 147 Module
H01
Issued: 02/2008 Frequency Converter SINAMICS G120 on PROFIBUS DP and PROFINET
Preface Notes Startup with PROFIBUS Startup with PROFINET Program Example
6.1.3 The Main Setpoint (HSW)
The main setpoint is a 16 bit word that transmits the required frequency setpoint to the converter.
The setpoint is transmitted as a signed integer (-32768 to 32767). The value 16384 (4000 hex)
corresponds to +100%.
By means of the parameter P1082, the value 100% is normalized to a plant frequency. In this
parameter, the frequency value is entered to which a setpoint of 100% is to correspond over the
serial interface.
The output frequency is calculated as follows:
f = (HSW x P1082)/16384
6.1.4 The Main Actual Value (HIW)
The main actual value is a 16 bit word that transmits the converter’s actual frequency output. The
normalization of this value corresponds to that of the setpoint.