Operating Instructions

6.6 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 Explanation
p2020 Fieldbus interface baudrate
(Factory setting: 8)
4: 2400 baud
5: 4800 baud
6: 9600 baud
7: 19200 baud
8: 38400 baud
9: 57600 baud
10: 76800 baud
11: 93750 baud
12: 115200 baud
13: 187500 baud
p2021 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.
p2022 Fieldbus interface USS PZD number (Factory setting: 2)
p2023 Fieldbus interface USS PKW number (Factory setting: 127) 0: PKW 0 words
3: PKW 3 words
4: PKW 4 words
127: PKW variable
p2024 Fieldbus interface times (Fac‐
tory setting: [0] 1000 ms,
[1] 0 ms, [2] 0 ms)
[0] Maximum permissible telegram processing time of
the Modbus slave
[1] Character delay time
[2] dead time between two telegrams
r2029 Fieldbus interface error statis‐
tics
[0] number of error-free
telegrams
[1] number of rejected tele‐
grams
[2] number of framing er‐
rors
[3] number of overrun er‐
rors
[4] number of parity errors
[5] number of starting char‐
acter errors
[6] number of checksum
errors
[7] number of length errors
p2030 = 1 Fieldbus interface protocol selection: USS
p2031 Fieldbus interface Modbus
parity (Factory setting: 2)
0: No parity
1: Odd parity
2: Even parity
p2040 Fieldbus interface monitoring time (Factory setting: 100 ms)
p2040 = 0: The monitoring is deactivated
Advanced commissioning
6.6 Drive control via USS
Converter with the CU230P-2 Control Units
Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257946B AF 239