Modbus Rtu - Siemens SINAMICS G120P CU230P-2 Compact Operating Instructions

4.3.2

Modbus RTU

Settings for Modbus RTU
Parameter
p0015 = 109
p2020
p2021
p2024
r2029
p2030 = 2
p2031
CU230P-2 Control Units
Compact Operating Instructions, 01/2017, A5E38815802B AA
Explanation
Macro drive unit
Set communication via Modbus RTU
Default setting of the interfaces (Page 16)
Fieldbus interface baud rate
p0015 = 109 sets p2020 = 6
Fieldbus interface address
Valid USS addresses: 1 ... 247.
The parameter is only active if address 0 is set at the Control Unit address switch.
A change only becomes active after the inverter power supply is switched off and
switched on again.
Fieldbus [0] Maximum permissible telegram processing time of the Modbus
interface slave
times
[2] dead time between two telegrams
Fieldbus [0] number of error-free telegrams
interface
[1] number of rejected telegrams
error statis-
[2] number of framing errors
tics
[3] number of overrun errors
Fieldbus interface protocol selection
p0015 = 109 sets p2013 = 2 → Modbus RTU
Fieldbus interface Modbus
parity
4.3 Connecting the inverter to the fieldbus
4: 2400 baud
5: 4800 baud
6: 9600 baud
7: 19200 baud
8: 38400 baud
[4] number of parity errors
[5] number of starting character
errors
[6] number of checksum errors
[7] number of length errors
0: No parity
1: Odd parity
2: Even parity
Commissioning
9: 57600 baud
10: 76800 baud
11: 93750 baud
12: 115200 baud
13: 187500 baud
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