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Commissioning
3
Communication
3.7.2
3.7.2.1
32
Siemens AG
NOTICE
A bus address, baud rate or protocol selection that has been changed only
becomes effective once the drive has been switched off and back on again.
Restart the drive after changing the bus address.

USS protocol

Using the USS protocol (Universal Serial Interface), users can set up a serial data
connection between a higher-level master system and several slave systems (RS
485 interface). Master systems can be building services control systems (e.g.,
Desigo), programmable logic controllers or PCs.
Basic settings
Parameter
Description
p0015
Macro drive unit
During the basic commissioning, select the value 108 "USS fieldbus", or with
firmware < 4.6 the value 21.
p2020
Value
4
5
6
7
8
9
10
11
12
13
p2021
Valid USS addresses: 1...30
Invalid USS addresses: 0.31...127
p2022
Fieldbus interface USS PZD number
Setting the number of 16-bit words in the PZD part of the USS telegram
p2023
Fieldbus interface USS PKW number
Setting the number of 16-bit words in the PKW part of the USS telegram
0
3
4
127
p2030
Fieldbus protocol selection
1: USS
p2040
Fieldbus interface, monitoring time [ms]
Setting the time to monitor the process data received via fieldbus. If no process data
is received within this time, an appropriate message is output
The setting 0 ms deactivates the monitoring.
Baud rate
2400
4800
9600
19200
38400
57600
76800
93750
115200
187500
0 words
3 words
4 words
Variable number of words
CM2G5111en
2014-05-16

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