Siemens SIMOTION Series Commissioning And Hardware Installation Manual page 198

Alarm, error and system messages
12.4 Power failure / POWER FAIL
SIMOTION P Runtime
If a power failure occurs, the POWER FAIL functionality of the SIMOTION P Runtime will
perform the following steps:
● SIMOTION P Runtime is shut down correctly
● The user data marked as retain is saved in the non-volatile memory of the
SIMOTION P320‑4
The backed-up user data is available again at the next power-up of the SIMOTION P Runtime.
SIMOTION P Runtime is therefore ready for operation again without any data loss.
Note
Backup of the user data in the SRAM of the SIMOTION P320‑4 in case of power failure is only
guaranteed if the SIMOTION P320‑4 is operated within its defined specifications.
The message POWER FAIL is displayed if the supply voltage for SIMOTION P320‑4 falls below
20.4 V. In this case, check the voltages in the external power supply:
1. Check if the input voltage (mains voltage) for the external power supply has the rated value.
2. If so, check the output voltage of the external power supply. If the voltage is not within the
limits for the supply voltage of the SIMOTION P320‑4 (19.2 ... 28.8 VDC), then change the
external power supply.
Windows
If the SIMOTION P320-4 is shut down during operation, the Windows installation may be
damaged.
The consistency of Windows applications cannot be guaranteed during a power failure.
In these cases, we strongly recommend use of an EWF or a UPS system.
NOTICE
Do not protect external CFast cards with EWF
Drive D: - the external CFast card - must not be protected with EWF as otherwise the
functionality of SIMOTION cannot be assured.
Note
Only applies to the SIMOTION P320-4 E
SIMOTION P320-E is delivered with deactivated EWF (Enhanced Write Filter).
After the device is commissioned, activate the EWF for drive C: because this ensures:
● An extended service life for the internal CFast card
● No data loss on the internal CFast card when switching the device off via the line side switch
or through disconnection from the power supply
198
SIMOTION P320-4 E / P320-4 S
Commissioning and Hardware Installation Manual, 11/2016