Functions
10.5 Status display
SIMATIC HMI IPC677C
110
Operating Instructions, 04/2013, A5E02722710-04
10.5
Status display
The status display consists of two 7-segment displays and two three-color LEDs.
①
LED H1
②
2 x 7-segment display
③
LED H2
Function of the 7-segment displays
The POST codes of the respective test step are displayed during the startup of the BIOS.
The POST code of the most recently started test step is displayed should an error occur.
Code 00 is displayed when the startup is completed without error.
Application codes can also be displayed if required.
Function of the LED H1, H2
During the BIOS startup, the two LEDs light up in three colors (red, yellow and green) to test
their operation. The two LEDs switch off when the startup is completed without errors.
Applications can trigger the two LEDs if required.
Note
You will find the programming interface and sample programs on the DVD
"Documentation & Drivers" in the folder "Drivers\DiagBase\program
files\Siemens\DiagnosticManagement".
10.6
SRAM buffer memory
In order for applications to store data following a power failure, the motherboard features
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.