Siemens SIMATIC Series Operating Instructions Manual page 64

Commissioning the device
4.6 Switching off the device
Hardware reset
You can perform a hardware reset to restart the device when the operating system no longer
responds to input from the keyboard or mouse. The operating system is not safely shut down
in this case.
NOTICE
Risk of data loss
The device is restarted in the case of a hardware reset. Data in the main memory can be
deleted. Data on the drive may be lost. The device may be damaged.
Perform a hardware reset only in the case of an emergency.
Procedure:
1. Press the on/off button for more than 4 seconds.
2. Alternatively, you can press the reset button.
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Operating Instructions, 04/2020, A5E49948632-AA
SIMATIC IPC547G