ON-LINE CONFIGURATION
OPERATION
A - 4
I-E96-211A
®
Backup Cycle
The step numbers in this cycle correspond to the states of Fig-
ure
. The state of the LEDs and the contents of the second
module status byte are indicated in the left margin.
NOTE: When resetting the module with the Reset pushbutton,
always halt the module first by pressing the Stop pushbutton. Wait
for the status light to turn red before you press the Reset
pushbutton.
Primary
Backup
n
n+1
00xx0x0x 10xx0x0x
z
{
z
z
1. Save a copy of the old configuration. This enables it to be
easily restored if necessary.
Figure A-2. Backup MFC Operation Cycle
CHECKPOINT DATA
IS COMPLETE
4
BACKUP
EXT
3
BACKUP
EXT
2
BACKUP
CFG
1
BACKUP
EXT
2A
BACKUP
ERR
9
PRIMARY
EXT
8
PRIMARY
EXT
7
BACKUP
EXT
6
BACKUP
EXT
5
BACKUP
EXT
T00040A
LEGEND:
EXT = EXECUTE MODE
CFG = CONFIGURATION MODE
ERR = ERROR MODE
BUSCLK = LOSS OF BUS CLOCK
ST EP
RO LE
MOD E
CHECKPOINT
DATA IS
COM PLETE
RESET
(CHANGES MADE)
REQUEST
SHUTDOWN OF
PRIMARY
BUSCLK
BUSCLK
BUSCLK
BUSCLK
RESET (CONFIGURATION NOT COPIED)
CONFIGURATION
IS COPIED TO
THE BACKUP
RESET
(NO CHANGE)
EXT
EXT
CFG
CFG
CFG
INITIALIZE
EEROM