Siemens SINAMICS G120XA - USS Process Data Channel (PZD)

● p2023 = 4:
If you want to read or write 32-bit values (for example indexed parameters or bit parameters,
e.g. r0722.2), then this setting is required. In this case, the send or receive telegram always
contains four words, even if only three would be required. The values are right-justified in the
4th word.
● p2023 = 127:
If you set p2023 = 27 (variable length), the send and response telegrams are as long as the
task actually requires.
Process data
Parameter p2022 defines the length for the process data. You can transfer up to eight process
data items in one telegram (p2022 = 0 … 8). For p2022 = 0, no process data is transferred.
Parameters
Parameter Description Factory setting
p2022 Fieldbus interface USS PZD number 2
p2023 Fieldbus interface USS PKW number 127
6.2.4.5 USS process data channel (PZD)
Function description
The process data channel (PZD) contains the following data depending on the transmission
direction:
● Control words and setpoints for the slave
● Status words and actual values for the master.
$QVZHU
WR866PDVWHU
5HTXLUHPHQW
WR866VODYH
3='3='3='3='3='
3='3='3='3='3='
S 
S 
=6:+,:=6:
S
67:+6:67:


Figure 6-10 Process data channel
The first two words are:
● Control 1 (STW1) and main setpoint (HSW)
● Status word 1 (ZSW1) and main actual value (HIW)
If p2022 is greater than or equal to 4, then the converter receives the additional control word
(STW2).
Advanced commissioning
6.2 Drive control
SINAMICS G120XA converter
170 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB