MAN0964-14-EN_XL4_XL4P_UM
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CHAPTER 18: FAIL
–
SAFE SYSTEM
18.1 Overview
The Fail-Safe System is a set of features that allow an application to continue running in the
event of certain types of "soft" failures. These "soft" failures include:
•
Battery power loss
•
Battery-Backed Register RAM or Application flash corruption due to, for example, an
excessive EMI, Electromagnetic Interference, event.
The Fail-Safe System has the following capabilities:
•
Manually backup the current battery-backed RAM Register Settings into flash memory.
•
Manually restore Register Settings from the values previously backed up in flash
memory to battery-backed RAM.
•
Detect corrupted Register Settings at power-up and then automatically restore
them from flash.
•
Detect corrupted or empty application in flash memory at power-up and then
automatically load the AUTOLOAD.PGM application file from Removable Media
(Compact flash or microSD).
•
If an automatic Register Restore or Application Load occurs, the OCS can
automatically be placed in RUN mode.
The fail-safe system can be accessed by going to the System Menu of the controller. A new
menu “Fail
-
Safe System” has been added at the end of the
main System Menu for this.
Selecting “Fail
-
Safe System” menu will open the following menu screen:
Figure 18.1
–
Fail
–
Safe System Menu