Technical Description
S5-115U Manual
Figure 2-9. Restart Characteristics of the CPU
1 If the PLC was in RUN at POWER OFF.
2 Please note the following differences:
-
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
* 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.
Process I/O image (PII and PIQ) is
deleted;
Non-retentive timers, counters and
flags are
deleted;
Digital outputs are
overwritten with
"0";
Cold restart routine is
delayed (delay
time in SD 126);
Configuration of I/O modules is
determined and stored;
Memory submodule
2
is
tested:
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)
PII read in
Processing of OB1
PIQ output
Power restoration
1
Outputs enabled
(BASP signal revoked)
Processing of OB22
*
Processing of OB21
*
Process I/O image (PII and PIQ) is
deleted;
Non-retentive timers, counters and
flags are
deleted;
Digital outputs are
overwritten with
"0";
Configuration of I/O modules is
determined and stored;
Memory submodule
2
is
tested:
Address list for the control program is
constructed;
DB1 is
interpreted (see Section 11.3)
Mode selector STOP RUN
PG command RUN
RUN
RESTART
Cold
restart
routine
2-18
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Содержание SIMATIC S5-115U
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