Siemens SIMATIC IPC347E Operating Instructions Manual page 16

Overview
1.2 Design of the device
Note
The PC switches on automatically after the power recovers when "Power Failure Recovery"
is active.
Depending on the "Power Failure Recovery" setting in BIOS, the PC switches on
automatically or you must press the on/off button on the front. The BIOS setting only
becomes effective when the device is without mains voltage for at least 10 seconds.
Automatic startup may endanger the operation of the machine or plant, for example, after a
power failure. Take this into account when designing the plant.
The following figure shows the position of the on/off button at the front of the device.
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NOTICE
Data loss
If the device is restarted by hardware reset, data in the main memory is deleted and the
data on the hard disk drive may be lost.
Perform a hardware reset only in the case of an emergency. Close all running programs.
Make sure that there is no more read or write access to drives and I/O before performing
the hardware reset.
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You can set this operation as shut down, sleep or hibernate in operating system.
The on/off/reset button
• Switch on the PC, press the on/off button once
shortly.
• Shut down the operating system and switch off
PC, press the on/off button once shortly.
• Switch off PC without shutting down the
operating system, press for more than 4
seconds – hardware reset.
Operating Instructions, 09/2018, A5E41134132-AE
①
has three functions:
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SIMATIC IPC347E