Communication Via Uss; Setting The Address; Structure Of A Uss Telegram - Siemens SINAMICS G120 Operating Instructions Manual

Configuring the fieldbus
7.3 Communication via RS485
7.3.2

Communication via USS

7.3.2.1

Setting the address

You can set the inverter's USS address using either DIP switches on the Control Unit or
parameter p2021.
Valid USS addresses:
Invalid USS addresses:
If you have specified a valid address using DIP switches, this address will always be the one
that takes effect and p2021 cannot be changed.
If you set all DIP switches to "OFF" (0) or "ON" (1), then p2021 defines the address.
The positions and settings of the DIP switches are described in Section Interfaces,
connectors, switches, terminal blocks and LEDs of the inverter (Page 39).
CAUTION
A bus address that has been changed is only effective after the inverter has been switched
off and back on again.
7.3.2.2

Structure of a USS telegram

A USS telegram comprises a sequence of characters, which are sent in a defined sequence.
Every character within the telegram comprises 11 bits. The sequence of characters of a USS
telegram is shown in the following diagram.
Figure 7-5
110
Header information
STX LGE
Structure of a USS telegram
1 ... 30
0, 31 ... 127
n net data
ADR 1. 2.
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
Final
information
: : : n BCC
SINAMICS G120C Inverter