Siemens SINAMICS G120XA, Operating Instructions Manual

Page: 175 / 918

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 Character runtime
Baud rate in bit/s Transmission time per bit Character run time (= 11 bits)
9600 104.170 µs 1.146 ms
19200 52.084 µs 0.573 ms
38400 26.042 µs 0.286 ms
57600 17.361 µs 0.191 ms
115200 8.681 µs 0.095 ms
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.
&KDUDFWHUGHOD\WLPH &KDUDFWHUUXQWLPH
0D[LPXPUHPDLQLQJWHOHJUDPUXQWLPH
5HVLGXDOUXQWLPH
FRPSUHVVHGWHOHJUDP
RIFRPSUHVVHGWHOHJUDP
UHVLGXDOUXQWLPH
%&& Q $'5 /*( 67;
%&& Q $'5 /*( 67;
Figure 6-11 Telegram runtime as the sum of the residual runtime and character delay times
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.
6WDUWGHOD\ 6WDUWGHOD\ 5HVSRQVHGHOD\
5HTXHVWIURPPDVWHU 5HTXHVWIURP
WKHPDVWHU
6ODYHUHVSRQVH
Q
%&&
/*( 67;
%&& $'5 /*( 67;
%&& Q $'5 /*( 67;
Figure 6-12 Start delay and response delay
Table 6-33 Start delay
Baud rate in bit/s Transmission time per character (= 11 bits) Min. start delay
9600 1.146 ms > 2.291 ms
19200 0.573 ms > 1.146 ms
Advanced commissioning
6.2 Drive control
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
173