GE D25 User Manual page 98

D25
User's Manual
Downloading a Configuration,
What Happens A mismatch error between Code and Configuration files causes the D25 to
when the Files
reboot.
do not Match?
The D25's base system performs this procedure after each reboot:
How Does the
D25 React to
1. Every time the D25 is rebooted, a counter is incremented.
This type of
Error?
2. If the D25 runs for 2 minutes without a reboot, this counter is cleared.
3. If the counter ever reaches 20, the base system invalidates the
configuration by writing "KILL" into the configuration file without
recalculating the file's CRC.
4. The base system then forces a system reset.
5. When the unit comes back up, the base system detects a configuration that
is now invalid and creates a default configuration instead (or loads a
stored back-up configuration, if it is available in memory).
Why is This This process is designed to protect systems that have fatal errors that cause
Done?
the system to reset before the user can get into WESMAINT to fix the
problem
While a user can always directly default the configuration by pressing <ESC>
during the start-up sequence, this only works if the customer is physically
present and connected to the WESMAINT port.
Since the D25 has the ability to receive files remotely over a LAN, the
problem may occur when a user is downloading remotely and logging in over
TELNET. An error that causes the system to constantly reboot could
potentially continue forever, filling up NVRAM with many error messages.
This process enables the D25 to eventually settle down on its own.
When to Erase Rule:
a Configuration
98
Continued
If the code file is not exactly the same as the one that was in use
before the download, then erase a configuration file from the D25's
NVRAM before downloading a new code file into FLASH memory.
994-0081-3.00-21
GE Grid Solutions
GE Information