Telegram Monitoring; Character Runtime; Start Delay And Response Delay - Siemens SINAMICS G120XA Operating Instructions Manual

6.2.4.6

Telegram monitoring

Function description
You require the telegram runtimes in order to set the telegram monitoring. The character
runtime is the basis of the telegram runtime:
Table 6-32
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 6-11
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 6-12
Table 6-33
Baud rate in bit/s
9600
19200
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB

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

Start delay
Transmission time per character (= 11 bits)
1.146 ms
0.573 ms
Advanced commissioning
6.2 Drive control
Character run time (= 11 bits)
1.146 ms
0.573 ms
0.286 ms
0.191 ms
0.095 ms
Min. start delay
> 2.291 ms
> 1.146 ms
173