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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.
a47003
OK
RUN
ENABLED
MEM PROTECT
CENTRAL
PROCESSOR
UNIT
MEMORY
PROTECT
KEY
SWITCH
CPU |
| |
STATUS |
| |
LEDS | B | |
CPU MODE | ||
A | ||
SWITCH | T | |
| T | |
OPEN | E | |
R | ||
REPLACEMENT | ||
Y | ||
BATTERY |
| |
CONNECTOR |
| |
CURRENTLY |
| |
INSTALLED |
| |
BATTERY |
| |
CONNECTOR |
|
EXPANSION
MEMORY
BOARD
IC697MEM731
IC697MEM732
IC697MEM733
IC697MEM735
COMPATIBLE
SERIAL PORT
CPU 780
TOP
OFF
ON
REMOTE PROGRAMMER MEMORY PROTECT KEY POSITION
FRONT
MODULE OK
RUN
OUTPUTS ENABLED
MEMORY PROTECT
REMOTE PROGRAMMER ONLY
ON = OK, ENABLED PROTECTED
RUN WITH
OUTPUTS
ENABLED
RUN WITH
OUTPUTS
DISABLED
STOP
BATTERY
CONNECTORS
INSTALL NEW BATTERY BEFORE UNPLUGGING OLD BATTERY. USE IC697ACC701
MODULE FUNCTION
16MHz 32 BIT CENTRAL PROCESSING UNIT WITH FLOATING POINT MATH COPROCESSOR FOR HOT STANDBY CPU APPLICATIONS
SERIAL PORT
COMPATIBLE
USE THIS MODULE
IN SLOT 1 ONLY
MODULE IC697CPU 780
LABEL
Figure 4. Redundancy CPU - IC697CPU 780
Chapter 2 System Components | 15 |