Siemens SINAMICS G120 - Page 165

Configuring the fieldbus
7.6 Communication via RS485
Inverter with CU230P-2 Control Units
Operating Instructions, 11/2013, FW V4.6.6, A5E02430659B AG
165
Table 7- 17 Baud rates, transmission times, and delays
Baud rate in bit/s (p2020)
Transmission time per
character (11 bits)
Minimum pause
between two
telegrams (p2024[2])
Maximum pause
between two bytes
(p2024[1])
4800
2.292 ms
≥ 8.021 ms
≤ 3.438 ms
9600
1.146 ms
≥ 4.010 ms
≤ 1.719 ms
19200 (factory setting)
0.573 ms
≥ 1.75 ms
≤ 0.859 ms
38400
0.286 ms
≥ 1.75 ms
≤ 0.75 ms
57600
0.191 ms
≥ 1.75 ms
≤ 0.556 ms
76800
0.143 ms
≥ 1.75 ms
≤ 0.417 ms
93750
0.117 ms
≥ 1.75 ms
≤ 0.341 ms
115200
0.095 ms
≥ 1.75 ms
≤ 0.278 ms
187500
0.059 ms
≥ 1.75 ms
≤ 0.171 ms
Note
The factory setting for p2024[1] and p2024[2] is 0. The converter specifies the associated
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 converter supports the following addressing ranges:
Addressing range
Remark
40001 … 40065 Compatible with Micromaster MM436
40100 … 40522
The valid holding register addressing range extends from 40001 to 40522. Access to other
holding registers generates the fault "Exception Code".
The registers 40100 to 40111 are described as process data.
Note
"
R"; "W"; "R/W" in the column Modbus access stands for read (with FC03); write (with FC06);
read/write.