Parameters For Modbus Communication Settings - Siemens SINAMICS G110M Function Manual

Communication via RS485
5.4 Communication using Modbus RTU
5.4.1.2

Parameters for Modbus communication settings

General settings
Fieldbus protocol selection
Baud rate
Setting range: 4800 bit/s ... 187500 bit/s
Parity
In the factory, the Control Unit is set for controllers with even parity You can adapt the parity
at your controller using p2031:
● p2031 = 0: No parity
● p2031 = 1: Odd parity
● p2031 = 2: Parity even
Note
Number of stop bits
For No parity, the control sends 2 stop bits, for parity odd or parity even, only 1 stop bit
Modbus timing
● p2024[0]: Maximum slave telegram processing time:
The time after which the slave must have sent a response to the master. 0 ms ...
10000 ms, factory setting = 6000 ms.
● p2024[1]: Character delay time:
Character delay time: Maximum permissible time between the individual characters in the
Modbus frame. (Modbus standard processing time for 1.5 bytes).
● p2024 [2]: Inter-telegram delay:
maximum permissible time between Modbus telegrams. (Modbus standard processing
time for 3.5 bytes).
Values for p2024 [1] and p2024 [2]
Fieldbus monitoring time
Setting range: 0 ms ... 1999999 ms
The more slaves that are connected in the network, the longer the fieldbus monitoring time
must be.
If process data is not transferred within one cycle of the fieldbus monitoring time, then the
inverter shuts down with fault F01910.
p2040 = 0 ⇒ bus monitoring deactivated.
Fieldbus error statistics
Displaying receive errors at the fieldbus interface
128
p2030 = 2 (Modbus RTU)
p2020 = 7, 19200 bit/s
p2024[0 ... 2]
Table 5-10 Baud rates, transmission times, and delays (Page 131).
p2040 = 1000 ms
r2029
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
Fieldbuses