Horner-apg QX751 OCS Manuale Utente Scaricare il pdf (Pagina 73)

MAN0890-02-EN CH. 14

August 20, 2009 Page 73 of 96 ECN # 979

CHAPTER 14: FAIL-SAFE SYSTEM

14.1 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.

• 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. The 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 14.1 – Fail-Safe System

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Horner-apg QX751 OCS Manuale Utente Pagina 73