Time-Out And Other Errors - Siemens SINAMICS G120 Operating Instructions Manual

The first two words are:
● Control 1 (STW1) and main setpoint (HSW)
● Status word 1 (ZSW1) and main actual value (HIW)
If p2022 is greater than or equal to 4, the additional control word (STW2) is transferred.
You define the sources of the PZD using parameter p2051.
For further information, please refer to the Parameter Manual.
8.4.2.6

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 8- 24
Baud rate in bit/s
9600
19200
38400
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 8-14
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.
SINAMICS G120C frequency converter
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
Character runtime
Transmission time per bit
104.170 µs
52.084 µs
26.042 µs
5.340 µs
Residual runtime
(compressed telegram)
Telegram runtime as the sum of the residual runtime and character delay times
Character run time (= 11 bits)
1.146 ms
0.573 ms
0.286 ms
0.059 ms
50% of compressed
telegram residual runtime
: : :
: : :
Configuring the fieldbus
8.4 Communication via RS485
119