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Technical Description
Mode selector STOP RUN
Process I/O image (PII and PIQ) is
deleted ;
Non-retentive timers, counters and
flags are deleted ;
Digital outputs are overwritten with
"0";
Configuration
determined and stored;
Cold
Memory submodule
restart
Address list for the control program is
routine
constructed ;
DB1 is interpreted (see Section 11.3)
Processing of OB21
RESTART
RUN
1 If the PLC was in RUN at POWER OFF.
2 Please note the following differences:
* If OB21 or OB22 contains the RA (enable interrupt) operation, a central process interrupt is possible from this point.
If this operation has not been used in the RESTART OB, interrupt and timed-interrupt OBs can only become effective
after the RESTART OB has been processed.
2-18
PG command RUN
of
I/O
modules
2
is tested :
*
Outputs enabled
(BASP signal revoked)
Processing of OB1
-
CPU 941/942: Program runs from memory submodule
-
CPU 943/944: Program is loaded from the memory submodule into inter-
nal program memory and processed there
Figure 2-9. Restart Characteristics of the CPU
Power restoration
Process I/O image (PII and PIQ) is
deleted ;
Non-retentive timers, counters and
flags are deleted ;
Digital outputs are overwritten with
"0";
is
Cold restart routine is delayed (delay
time in SD 126);
Configuration
determined and stored;
Memory submodule
Address list for the control program is
constructed ;
DB1 is interpreted (see Section 11.3)
In addition, the battery, memory submodule
and status before POWER OFF are evaluated
(see Figure 2-10)
Processing of OB22
PII read in
PIQ output
S5-115U Manual
1
of
I/O
modules
is
2
is tested :
*
EWA 4NEB 811 6130-02b
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