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4.3.3
Comparison between
COLD RESTART and
WARM RESTART
Table 4-2
Manual
Mode selector from position STOP to RUN
triggering:
and reset switch set to RESET position
or
PG function PLC START (COLD
RESTART)
Automatic
Switching on the power supply, when
triggering:
"AUTOMATIC COLD RESTART after
POWER UP" is entered in DX 0
System
Set up block address list in DB 0
program
activities:
Delete process image of the inputs
Delete process image of the outputs
Delete flags, timers and counters
Delete digital/analog I/Os
(each 2 x 128 bytes)
Delete IPC flags (256 bytes)
Delete delayed interrupts and timed jobs
Delete ISTACK/BSTACK
Delete semaphore
If DB 1 exists:
write the digital I/Os entered in it into
the PI lists
If DB 1 does not exist:
enter the modules which actually exist
(only digital I/O) into the PI lists
IPC flags are ignored
CPU 948 Programming Guide
C79000-G8576-C848-04
The following table contains a comparison of the start-up types
COLD RESTART and WARM RESTART..
Characteristics of COLD RESTART and WARM RESTART
COLD RESTART
WARM RESTART
Mode selector from position STOP to
position RUN
or
PG function PLC START (WARM
RESTART)
Switching on the power supply when the
default is entered in DX 0 or no DX 0 exists
Block address list retained in DB 0
Process image of the inputs retained
Process image of the outputs retained
Flags, timers and counters retained
IPC flags retained
Delete delayed interrupts,
timed jobs retained
ISTACK/BSTACK retained
Semaphore retained
No entries made from DB 1
START-UP Mode
4 - 21
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