Siemens SINAMICS G120 - USS Process Data Channel (PZD); Time-Out and Other Errors

Configuring the fieldbus
7.6 Communication via RS485
Inverter with CU230P-2 Control Units
158 Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
7.6.2.5
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 7-14 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.
7.6.2.6
Time-out and other errors
You require the telegram runtimes in order to set the telegram monitoring. The character
runtime is the basis of the telegram runtime:
Table 7- 15 Character runtime
Baud rate in bit/s
Transmission time per bit
Character run time (= 11 bits)
9600
104.170 µs
1.146 ms
19200
52.084 µs
0.573 ms
38400
26.042 µs
0.286 ms
115200
5.340 µs
0.059 ms