Parameter Data Channel (Pkw) - Siemens SINAMICS G120 Operating Instructions Manual

Functions
8.7 Communication via USS
8.7.4

Parameter data channel (PKW)

Parameter data area (PKW)
The USS protocol defines for the inverters, the user data structure with which a master can
access the inverter slaves. The PKW (parameter identifier value) telegram section can be
used to monitor and/or change any parameter in the inverter.
PKW mechanism for processing parameters
Using the PKW mechanism parameters can be processed and monitored (write/read) as
described below. The parameter area includes at least 3 words and is set with parameter
P2013. Values for P2013 are the number of PKW words. Possible settings are 0, 3, 4, 127
with 127 for variable length.
Figure 8-20
Parameter identifier (PKE), 1
The parameter identifier (PKE) is always a 16-bit value.
Figure 8-21
● Bits 0 to 10 (bPNU) contain the remainder of the parameter number (value range 1 to
● Bit 11 (SPM) is reserved and always = 0.
● Bits 12 to 15 (AK) contain the request or the response identifier.
8-28
Structure of parameter area (PKW)
word
st
PKE structure
1999). For parameter numbers ≥ 2000 it is necessary to add an offset which is defined
with the high byte bits of IND.
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S