MAN0974-14-EN_XL7_XL7P_UM
July 6, 2022
Page 168 | 199
CHAPTER 19:
FAIL
–
SAFE SYSTEM
19.1 Overview
For the XL7 Series
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.
For the XL7 Prime Series
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:
•
Retentive Register 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 Retentive 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 M
enu of the controller. A new menu “Fail
-
Safe System” has been added at the end of the main
System M
enu for this. Selecting “Fail
-
Safe System”
menu will open the following menu screen:
Figure 19.1
–
Fail
–
Safe System Menu