Operating the device and device functions
5.5 Extended device functions
SIMATIC IPC677D
66
Operating Instructions, 09/2014, A5E32995420-AC
5.5.4
Buffer memory SRAM (optional)
In order for applications to store data following a power failure, motherboards with fieldbus
(PROFIBUS or PROFINET) feature battery-buffered SRAM. If the supply voltage fails for
more than 20 ms for the AC power supply or more than 5 ms for the DC power supply, then
you will be informed about this situation by the NAU signal.
At least 10 ms is available to copy the data to the buffered RAM. During this time, 128 Kb
can be saved with a full load and even more with a smaller configuration, in other words, a
lesser load. A maximum 2 MB memory window is displayed via a PCI address register. The
base address is initialized by the BIOS.
A corresponding function is implemented there for using the SRAM under WinAC RTX.
Note
If replacement of the battery takes longer than 30 seconds, the data saved in the CMOS
RAM and in the buffered SRAM is lost.
Note
The buffer memory SRAM is available only with devices with PROFIBUS or PROFINET
interfaces.
5.5.5
Active Management Technology (AMT)
AMT (Active Management Technology) is technology for the remote maintenance of
computers (simply called AMT-PC in the remainder of the document) and it includes the
following functions:
●
Keyboard Video Mouse( KVM) Redirection: Using KVM that is integrated in the AMT
hardware you access the AMT PC remotely. With KVM, you can also control AMT PCs
that have no operating system or a defective operating system. A KVM remote session is
always possible with the KVM server integrated in the firmware. This means you can
restart the PC and change the BIOS setup remotely.
●
Remote power management: AMT PCs can be turned on and off and restarted from
another PC.
●
SOL (Serial over LAN): Redirection of the data of a serial interface to the network. The
main use of the function is text-based remote control of an AMT PC using a console.
●
IDE redirection: An ISO file on the help desk PC can be mounted on the AMT PC and
used as a DVD drive.
An ISO file contains a memory image of the content of a CD or DVD structured in the ISO
9660 format.
●
Remote reboot: An AMT PC can be booted from a bootable ISO file made available by
another PC.
