Siemens SINAMICS G120XA - Telegram Structure; Setting the Address

6.2.4.2 Setting the address
Function description
Procedure
1. Using parameter p2021, set the address using an operator panel or SINAMICS G120 Smart
Access.
Permissible addresses: 1 … 247.
2. Switch off the converter power supply.
3. Wait until all LEDs on the converter are dark.
4. Switch on the converter power supply again.
Your settings become active after switching on.
You have set the bus address.
❒
Parameters
Parameter Description Factory setting
p2021 Fieldbus interface address 0
6.2.4.3 Telegram structure
Overview
A USS telegram comprises a series of elements with a defined sequence. Each element
contains 11 bits.
6WDUWGHOD\866IUDPH
QQHWGDWD)LQDOLQIRUPDWLRQ+HDGHULQIRUPDWLRQ
ELWGDWD
%LW
6WRS
%LW
3HYHQ
%LW
6WDUW
67;/*($'5Q%&&
Figure 6-8 Structure of a USS telegram
Telegram part Description
Start delay / re‐
sponse delay
There is always a start and/or response delay between two telegrams.
Telegram monitoring (Page 173)
STX An ASCII character (02 hex) indicates the beginning of the message.
LGE The telegram length "LGE" is calculated as follows:
LGE = user data (n bytes) + ADR (1 byte) + BCC (1 byte)
Advanced commissioning
6.2 Drive control
SINAMICS G120XA converter
168 Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB