Time-Out And Other Errors - Siemens SINAMICS G110M Function Manual

5.3.6

Time-out and other errors

You require the telegram runtimes in order to set the telegram monitoring. The character
runtime is the basis of the telegram runtime:
Table 5- 8
Baud rate in bit/s
9600
19200
38400
57600
115200
The telegram runtime is longer than just purely adding all of the character runtimes
(=residual runtime). You must also take into consideration the character delay time between
the individual characters of the telegram.
Figure 5-8
The total telegram runtime is always less than 150% of the pure residual runtime.
Before each request telegram, the master must maintain the start delay. The start delay
must be > 2 × character runtime.
The slave only responds after the response delay has expired.
Figure 5-9
Fieldbuses
Function Manual, 04/2018, FW V4.7 SP10, A5E34229197B AE
Character runtime
Transmission time per bit
104.170 µs
52.084 µs
26.042 µs
17.361 µs
8.681 µs
Telegram runtime as the sum of the residual runtime and character delay times
Start delay and response delay
Communication via RS485
5.3 Communication via USS
Character run time (= 11 bits)
1.146 ms
0.573 ms
0.286 ms
0.191 ms
0.095 ms
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