Baud Rates And Mapping Tables - Siemens SINAMICS G110M Function Manual

Communication via RS485
5.4 Communication using Modbus RTU
5.4.3

Baud rates and mapping tables

Permissible baud rates and telegram delay
The Modbus RTU telegram requires pauses for the following situations:
● for the start identifier
● for separating the individual frames
● for the end identifier
Minimum duration: Processing time for 3.5 bytes (can be set via p2024[2]).
A character delay time is also permitted between the individual bytes of a frame. Maximum
duration: Processing time for 1.5 bytes (can be set via p2024[1]).
Table 5- 10
Baud rate in bit/s (p2020)
4800
9600
19200 (factory setting)
38400
57600
76800
93750
115200
187500
Note
The factory setting for p2024[1] and p2024[2] is 0. The inverter defines the particular values
depending on the protocol selection (p2030) or the baud rate.
Modbus register and Control Unit parameters
The Modbus protocol contains register or bit numbers for addressing memory. You must
assign the appropriate control words, status words and parameters to these registers in the
slave.
The inverter supports the following addressing ranges:
Addressing range
40001 ... 40065
40100 ... 40722
The valid holding register address range extends from 40001 up to 40722. When trying to
access other holding registers, the "Exception code" error is output
126
Baud rates, transmission times, and delays
Transmission time per
character (11 bits)
2.292 ms
1.146 ms
0.573 ms
0.286 ms
0.191 ms
0.143 ms
0.117 ms
0.095 ms
0.059 ms
Remark
Compatible to MICROMASTER MM436
Minimum pause
between two tele-
grams (p2024[2])
≥ 8.021 ms
≥ 4.010 ms
≥ 1.75 ms
≥ 1.75 ms
≥ 1.75 ms
≥ 1.75 ms
≥ 1.75 ms
≥ 1.75 ms
≥ 1.75 ms
Function Manual, 01/2016, FW V4.7 SP6, A5E34229197B AC
Maximum pause
between two bytes
(p2024[1])
≤ 3.438 ms
≤ 1.719 ms
≤ 0.859 ms
≤ 0.75 ms
≤ 0.556 ms
≤ 0.417 ms
≤ 0.341 ms
≤ 0.278 ms
≤ 0.171 ms
Fieldbuses