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15GFK-0827 Chapter 2 System Components
timer is 10 milliseconds to 1000 milliseconds. The default value for the watchdog timer is
200 milliseconds. The watchdog timer resets at the beginning of each sweep. The fail
wait time is included in the watchdog check. The watchdog timer should be set to allow
for the expected scan plus two fail wait times.
CPU Features
The CPU must reside in Slot 1 in rack 0, the main (CPU) rack. An illustration of the CPU
780 is shown in the following figure, followed by a description of the CPU features.
OK
RUN
ENABLED
MEM PROTECT
CENTRAL
PROCESSOR
UNIT
Y
R
E
B
A
T
T
MODULE
IC697CPU 780
LABEL
44A726758-130R03
SERIAL PORT
USE THIS MODULE
IN SLOT 1 ONLY
CPU 780
OFF
ON
TOP
REMOTE PROGRAMMER
MODULE OK
RUN
OUTPUTS
ENABLED
FRONT
STOP
KEY POSITION
MODULE FUNCTION
16MHz 32 BIT CENTRAL
PROCESSING UNIT
BATTERY
CONNECTORS
INSTALL NEW
BATTERY BEFORE
UNPLUGGING OLD
BATTERY. USE
IC697ACC701
MEMORY PROTECT
MEMORY PROTECT
REMOTE
PROGRAMMER
ONLY
RS-485
COMPATIBLE
RUN WITH
OUTPUTS
ENABLED
RUN WITH
OUTPUTS
DISABLED
ON = OK, ENABLED
PROTECTED
WITH FLOATING POINT
MATH COPROCESSOR
FOR HOT STANDBY
CPU APPLICATIONS
OPEN
REPLACEMENT
BATTERY
CONNECTOR
EXPANSION
MEMORY
BOARD
IC697MEM731
IC697MEM732
IC697MEM733
IC697MEM735
CURRENTLY
INSTALLED
BATTERY
CONNECTOR
MEMORY
PROTECT
KEY
SWITCH
SERIAL PORT
RS-485
COMPATIBLE
CPU
STATUS
LEDS
CPU MODE
SWITCH
a47003
Figure 4. Redundancy CPU - IC697CPU 780