Siemens Sinamics G120P Operating Instructions Manual page 229

Telegram monitoring of the master
With your USS master, we recommend that the following times are monitored:
• Response delay:
• Telegram runtime:
Telegram monitoring of the inverter
The inverter monitors the time between two requests of the master. Parameter p2040
defines the permissible time in ms. If a time p2040 ≠ 0 is exceeded, then the inverter
interprets this as telegram failure and responds with fault F01910.
150% of the residual runtime is the guide value for the setting of p2040, i.e. the telegram
runtime without taking into account the character delay times.
For communication via USS, the inverter checks bit 10 of the received control word 1. If the
bit is not set when the motor is switched on ("Operation"), the inverter responds with fault
F07220.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
Response time of the slave to a request from the master
The response delay must be < 20 ms, but longer than the start
delay
Transmission time of the response telegram sent from the slave
Operation
6.8 Communication via RS485
229