Siemens SINAMICS G120 Operations Instructions download pdf (Page 136)

Configuring the fieldbus

6.2 Communication via RS485

Inverter with CU240B-2 and CU240E-2 Control Units

134 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

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.



67: +6: 67:

S

=6: +,: =6:

S 

S 

3=' 3=' 3=' 3=' 3='

3='

3=' 3=' 3=' 3='

5HVSRQVH

WR866PDVWHU

5HTXHVW

WR866VODYH

Figure 6-9 Process data channel

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 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

1 2 ... 131 132 133 134 135 136 137 138 139 140 141 ... 303 304

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Siemens SINAMICS G120 Operations Instructions Page 136