Start-Up Sequence - Siemens SIMATIC S5 Manual
Interface of the programmable controller
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Also See for SIMATIC S5:
- Manual (396 pages) ,
- Equipment manual (197 pages) ,
- Operating instructions manual (43 pages)
Table of Contents
Start-Up, Tests, and Diagnostics
3.2
START-UP Sequence
In the START-UP sequence, the communications processor is activated before the START-UP OBs
are processed, as illustrated in Figure 3-2.
Operating mode switch set from STOP
to RUN; Programmer command RUN
Clear the process image I/O table, the
non-retentive timers, counters, flags, and
the ZP output area (if configured)
Interpret DB1
L2 interface activation
Processing OB21
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. If the battery was not inserted,
you must insert a memory submodule containing the valid blocks.
Figure 3-4. Start-Up Sequence at Power ON/Switch from STOP to RUN
When the S5-95U is in the STOP mode, only the cyclical I/O (ZP) and the programmer functions
are supported.
When the mode is switched from STOP TO RUN after a modification of the SL2 parameters in
DB1, the status bytes for SINEC L2 communication are reset on the CPU side, and running jobs are
deleted (communications processor is reset)
When the mode is switched from STOP TO RUN without a modification of the SL2 parameters
in DB1, the status bytes for SINEC L2 communication remain on the CPU side, and processing of
running jobs continues.
3-4
Clear the process image I/O table, the
non-retentive timers, counters, flags, and
the ZP output area (if configured)
Enabling the outputs
Read in the PII
Processing OB1
Read out the PIQ
1
Power recovery
Interpret DB1
L2 interface activation
Processing OB22
S5-95U, SINEC L2
Cold
restart
routine
red LED
lights up
START-
UP
red and
green
LEDs light
up
RUN
green
LED lights
up
EWA 4NEB 812 6112-02
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