Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 263)

Chapter
Call Routines 69–127 13
13 -5
Use CALL 73 to disable the battery-backed RAM and purge reset. You see
“Battery Backup Disabled” when you execute this call. The next power
loss destroys the contents of RAM. When you reapply power (if JW7 is
enable, page 1 -9), RAM is cleared and battery back-up is automatically
re-enabled.
Input and Output Arguments
This routine has no input or output arguments.
Syntax
CALL 73
Example
>CALL 73
CALL 74 enables the battery-backed RAM. You see “Battery Backup
Enabled” when you execute this call. The battery is enabled on power-up
and remains enabled until you execute a CALL 73 or until the battery fails.
Make sure jumper JW7 is set to the “battery enabled” position (page 1 -9).
Input and Output Arguments
This routine has no input or output arguments.
Syntax
CALL 74
Example
>CALL 74
Undefined. If you execute an undefined call, you receive the error
message, “
ERROR–UNSUPPORTED CALL” .
CALL 73: Battery-Backed
RAM Disable
CALL 74: Battery-Backed
RAM Enable
CALL 75 – 76