Chapter 19: Fail - Safe System; Overview - HORNER APG EXL10 OCS User Manual

CHAPTER 19:

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 to battery-
-
backed RAM.
- Detect corrupted Register Settings at power-up and then automatically restore them from flash
memory.
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:
t h
A p r i l 2 4 , 2 0 2 0
FAIL – SAFE SYSTEM
Figure 19.1 – Fail – Safe System Menu
MAN1029-08-EN_EXL10_UserManual
P a g e 161 | 191