Flash Eprom And Ram Management; Erasing Flash Eprom - Honeywell XI581AH User Manual

XI581/2 BUSWIDE OPERATOR INTERFACE

Flash EPROM and RAM Management

Access Level
Select System Data from Main Menu
Select Flash EPROM Item
Erase Flash EPROM
General Excel controllers contain their application data in RAM. However, RAM is a volatile
form of memory and the information can be lost in a power outage. To ensure the
information is not irretrievably lost, you can save the application data to EPROM
which is a nonvolatile form of memory that retains information without power.
Since the save procedure does not require to physically burn an EPROM, and thus
is relatively quick, the EPROM is called a "Flash" EPROM and the process is called
"flashing" the EPROM.
NOTE:
This section describes the procedures that apply to moving data between Flash
EPROM and RAM:
— Erasing the Flash EPROM
— Saving application in RAM to Flash EPROM
— Restoring application from Flash EPROM to RAM
Purpose To clear all application data from Flash EPROM.
You must have access level 3 to perform this task.
CAUTION
The following procedure erases ALL application data in Flash EPROM.
1. At the Main Menu, use the arrow keys to move to and highlight System Data.
Press Enter (↵) to complete the selection.
RESULT: The 'System Data' screen displays with controller name and software
System Data
2. Use the arrow keys to move to and highlight Flash EPROM. Press Enter (↵) to
complete the selection.
RESULT: The display window lists options for controlling Flash EPROM.
3. Use the arrow keys to move to and highlight Erase Flash EPROM and then
press Enter (↵) to complete the selection.
While it is possible to flash additional applications to EPROM without
affecting previously stored applications, it is not possible to erase only
individual applications (for example, to make space for new
applications).
version as well as three possible functions (depending on access
level).
System Info
HW-Interface Config.
Flash EPROM
Buswide Access
Flash EPROM
Save Application
Erase Flash EPROM
Show Applications
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ALPHABETIC REFERENCE

Erasing Flash EPROM

EN2B-0126 (74-3554-8)