Installing the CPU 41x-2 PCI and the Software
Windows Automation Center, WinAC Slot Version 4.0
30
Hardware Installation and Operating Manual, Edition 02/2006, A5E00273194-02
2.3
Connecting the CPU 41x-2 PCI to the Power Supply
2.3.1 Important
Information
This section provides decision-making guidance for connecting the CPU 41x-2 PCI
to the power supply. Depending on the power supply type and the settings in the
Restart Method and Autoload dialogs (refer to Status and Error Indications), the
restart behavior of the CPU 41x-2 PCI will vary.
•
Operation without an external independent 24 VDC power supply and without a
backup battery
When the PC is switched off, the data are lost.
You have the option of storing the STEP 7 user program in a memory card file
on the PC and loading this file automatically to the CPU 41x-2 PCI after Power
On.
The automatic warm restart/hot restart feature is
not
available.
•
Operation without an external independent 24 VDC power supply but with a
backup battery
The CPU 41x-2 PCI is independent of the PC as long as the power supply of
the PC functions, i.e., a warm restart of the PC does not affect operation of the
CPU 41x-2 PCI.
If the PC is switched off, the CPU 41x-2 PCI stores the current values of the
STEP 7 user program in such a way that an automatic warm restart/hot restart
is possible after Power On.
•
Operation with an external independent 24 VDC power supply and with a
backup battery
In this case, you can switch off the PC - the CPU 41x-2 PCI will continue
running!
The CPU 41x-2 PCI is independent of the PC. The PC can be switched off or
can even fail, and the CPU 41x-2 PCI will continue running (uninterrupted
power supply switchover). Here again, an automatic warm restart/hot restart is
possible.
Note
In order to operate the CPU 41x-2 PCI independently of the PC, OB 84 must be
programmed. If you have not programmed OB 84 and the PC is switched off or
it crashes, the CPU 41x-2 PCI goes to STOP.
For more detailed information, refer to .Responding to Diagnostic Events.
