Operating Instructions

Communication via RS485
5.3 Communication via USS
Fieldbuses
122 Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
5.3.5
USS process data channel (PZD)
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.
Figure 5-7 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).
You define the sources of the PZD using parameter p2051.
For further information, please refer to the List Manual.