Uss Process Data Channel (Pzd); Time-Out And Other Errors - Siemens SINAMICS G120 Operating Instructions Manual

Configuring the fieldbus
6.2 Communication via RS485
6.2.2.8

USS process data channel (PZD)

Description
Process data (PZD) is exchanged between the master and slave in this telegram range.
Depending on the direction of transfer, the process data channel contains request data for
the slave or response data to the master. The request contains control words and setpoints
for the slaves, while the response contains status words and actual values for the master.
Figure 6-9
The number of PZD words in a USS telegram is defined by parameter p2022. The first two
words are:
● Control 1 (STW1, r0054) and main setpoint (HSW)
● Status word 1 (ZSW1, r0052) and main actual value (HIW)
If P2022 is greater than or the same as 4, the additional control word (STW2, r0055) is
transferred as the fourth PZD word (default setting).
You define the sources of the PZD using parameter p2051.
For further information, please refer to the Parameter Manual.
6.2.2.9

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 6- 27
Baud rate in bit/s
9600
19200
38400
115200
134
Process data channel
Character runtime
Transmission time per bit
104.170 µs
52.084 µs
26.042 µs
5.340 µs
Character run time (= 11 bits)
1.146 ms
0.573 ms
0.286 ms
0.059 ms
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB