Siemens SINAMICS G120X, Руководство по эксплуатации

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6.3.5.5 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 6-41 Baud rates, transmission times, and delays
Baud rate in bit/s (p2020) Transmission time per
character (11 bits)
Minimum pause be‐
tween two telegrams
(p2024[2])
Maximum pause be‐
tween 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 defines the particular values
depending on the protocol selection (p2030) or the baud rate.
Modbus register and Control Unit parameters
The converter supports the subsequently listed registers. Error "Exception Code" is output if an
attempt is made to access other registers.
Note
Read and write access to converter data
R: read via FC03; W: write via FC06; R/W: read via FC03 or write via FC06
Advanced commissioning
6.3 Drive control
SINAMICS G120X converter
248
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC