Drive Control Via Modbus Rtu - Siemens SINAMICS G120 Operating Instructions Manual
Low voltage converters
chassis devices with cu240b-2 and cu240e-2
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Also See for SINAMICS G120:
- List manual (1256 pages) ,
- Manual (732 pages) ,
- Operating instructions manual (550 pages)
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Advanced commissioning
6.6 Drive control via Modbus RTU
6.6
Drive control via Modbus RTU
Modbus RTU is used to transfer cyclic process data and acyclic parameter data between
precisely one master and up to 247 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 Modbus RTU
Parameter
p2020
p2021
p2024
r2029
p2030 = 2
p2031
p2040
Control word 1 (STW1)
Bit
0
212
Explanation
Fieldbus interface baudrate
(Factory setting: 7)
Fieldbus interface address (Factory setting: 1)
Valid addresses: 1 ... 247.
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 times (Fac‐
tory setting: [0] 1000 ms,
[2] 0 ms)
Fieldbus interface error statis‐
tics
Fieldbus interface protocol selection: Modbus RTU
Fieldbus interface Modbus
parity (Factory setting: 2)
Fieldbus interface monitoring time (Factory setting: 100 ms)
p2040 = 0: The monitoring is deactivated
Meaning
0 = OFF1
0 → 1 = ON
5: 4800 baud
6: 9600 baud
7: 19200 baud
8: 38400 baud
9: 57600 baud
[0] Maximum permissible telegram processing time of
the Modbus slave
[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
Explanation
The motor brakes with the ramp-down time p1121 of
the ramp-function generator. The inverter switches off
the motor at standstill.
The inverter goes into the "ready" state. If, in addition
bit 3 = 1, then the inverter switches on the motor.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
10: 76800 baud
11: 93750 baud
12: 115200 baud
13: 187500 baud
[4] number of parity errors
[5] number of starting char‐
acter errors
[6] number of checksum
errors
[7] number of length errors
Signal inter‐
connection in
the inverter
p0840[0] =
r2090.0
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