Siemens Sinamics G120P Operating Instructions Manual page 291

● Life guarding:
Is active if you use p8604[0] and p8604[1] to set a Life Time ≠ 0.
Life Guarding means that the inverter monitors the master's monitoring query and reports
fault F8700 (A) with fault value 2, if a life guarding protocol (life guarding event) is not
received within the lifetime. Set additional responses to a bus failure in the master.
Calculate value for life time
Life Time = Guard Time in milliseconds (p8604[0]) x Life Time Factor (p8604[1])
Heartbeat
Principle of operation
The slave periodically sends heartbeat messages. Other slaves and the master can monitor
this signal. In the master, set the responses for the case that the heartbeat does not come.
Setting value for heartbeat
Set in p8606 the cycle time for the heartbeat in milliseconds.
Inverter behavior with a bus fault
With a bus fault, the CAN master goes to the "Bus OFF" status. In the inverter set the
response via the p8641 parameter. Factory setting: p8641 = 3 (OFF3). Once the bus fault
has been remedied, you can confirm the fault as follows:
● Via OFF/ON: This enables you to remove the "Bus OFF" state and restart the
communication.
● Via DI 2 or directly via p3981: the inverter remains in the "Bus OFF" state. To restart the
communication, set p8608[1] = 1.
Danger to life due to rotating motor after bus fault
If, in the event of a fault, the inverter does not set a bus fault (p8641 = 0), the motor cannot
be stopped via the controller. This can result in death or severe physical injury.
• In this case, wire an additional OFF command to the terminals in order to stop the
• To stop the motor via the controller, you must resolve the bus fault and restart the
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
WARNING
motor.
communication via p8608[1] = 1.
6.9 Communication over CANopen
Operation
291