MAN1256-05-EN_EXLW_XLWP_UM
November 10, 2021
163 | 201
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 an excessive EMI,
Electromagnetic Interference, event, for example.
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 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