Drive Control Via Uss - Siemens SINAMICS G120 Operating Instructions Manual

6.7

Drive control via USS

USS is used to transfer cyclic process data and acyclic parameter data between precisely one
master and up to 31 slaves. The inverter is always the slave, and sends data when requested
to do so by the master. Slave-to-slave communication is not possible.
Settings for USS
Parameter
p2020
p2021
p2022
p2023
p2024
r2029
p2030 = 1
p2031
p2040
Converter with the CU250S-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E31759476B AG
Explanation
Fieldbus interface baudrate
(Factory setting: 8)
Fieldbus interface address (Factory setting: 0)
Valid addresses: 0 ... 30.
The parameter is only active if address 0 is set at the Control Unit address switch.
A change only becomes effective after the inverter power supply has been switched off
and switched on again.
Fieldbus interface USS PZD number (Factory setting: 2)
Fieldbus interface USS PKW number (Factory setting: 127) 0: PKW 0 words
Fieldbus interface times (Fac‐
tory setting: [0] 1000 ms,
[1] 0 ms, [2] 0 ms)
Fieldbus interface error statis‐
tics
Fieldbus interface protocol selection: USS
Fieldbus interface Modbus
parity (Factory setting: 2)
Fieldbus interface monitoring time (Factory setting: 100 ms)
p2040 = 0: The monitoring is deactivated
4: 2400 baud
5: 4800 baud
6: 9600 baud
7: 19200 baud
8: 38400 baud
[0] Maximum permissible telegram processing time of
the Modbus slave
[1] Character delay time
[2] dead time between two telegrams
[0] number of error-free
telegrams
[1] number of rejected tele‐
grams
[2] number of framing er‐
rors
[3] number of overrun er‐
rors
0: No parity
1: Odd parity
2: Even parity
Advanced commissioning
6.7 Drive control via USS
9: 57600 baud
10: 76800 baud
11: 93750 baud
12: 115200 baud
13: 187500 baud
3: PKW 3 words
4: PKW 4 words
127: PKW variable
[4] number of parity errors
[5] number of starting char‐
acter errors
[6] number of checksum
errors
[7] number of length errors
209