MAN0974-11-EN_XL7_UserManual
March 22
nd
, 2020
Page 165 | 195
CHAPTER 19: FAIL
–
SAFE SYSTEM
19.1 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 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 19.1
–
Fail
–
Safe System Menu