Introduction to STEP 5 S5-95F
Figure 7-9. Setting the Start-Up Procedure
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1 This is the procedure if the programmable controller was in the "RUN" mode when the power went off, if the mode
switch was still on RUN when the power was restored, and if the battery was inserted.
Clear the process image I/O table,
the non-retentive timers, counters,
and flags. Interpret DB1
Processing OB21 Processing OB22
Read in the PII
Processing OB1
Read out the PIQ
Clear the process image I/O table,
the non-retentive timers, counters, and
flags. Interpret DB1
Enabling the outputs
Cold
restart
routine
START-
UP
RUN
Operating mode switch STOP
RUN; Programmer command START
Power recovery
1
The following two examples show you how you can program a start-up OB.
Example: Programming OB21/OB22
STLExample Explanation
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Value ”0” is loaded in
ACCU 1and transferred into
flag words 0, 2, 4, 6, and 8.
After the operating mode
switch causes a cold restart,
flag bytes 0 to 9 are preset
with ”0”. The other flag bytes
are retained since they contain
important machine functions.
LKH0
TFW0
TFW2
TFW4
TFW6
TFW8
BE
7-20
EWA 4NEB 812 6210-02
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