Operating Modes Of The Cpu; Startup Mode - Siemens SIMATIC ET 200SP System Manual

Commissioning

11.6 Operating modes of the CPU

Reactions after removing/inserting the SIMATIC memory card
Inserting and removing the SIMATIC memory card in STOP, STARTUP or RUN mode
triggers a re-evaluation of the SIMATIC memory card. The CPU hereby compares the
content of the configuration on the SIMATIC memory card with the backed-up retentive data.
If the backed-up retentive data matches the data of the configuration on the SIMATIC
memory card, the retentive data is retained. If the data differs, the CPU automatically
performs a memory reset (which means the retentive data is deleted) and then goes to
STOP.
The CPU evaluates the SIMATIC memory card, and this is indicated by the RUN/STOP LED
flashing.
Reference
You can find more information on the SIMATIC memory card in the function manual
Structure and use of the CPU memory
(https://support.industry.siemens.com/cs/ww/en/view/59193101).
11.6 Operating modes of the CPU
Introduction
Operating modes describe the status of the CPU. The following operating modes are
possible using the mode selector:
● STARTUP
● RUN
● STOP
In these operating modes, the CPU can communicate, for example, via the PROFINET
interface.
The status LEDs on the front of the CPU indicate the current operating mode.
11.6.1

STARTUP mode

Behavior
Before the CPU starts to execute the cyclic user program, a startup program is executed.
By suitably programming startup OBs, you can specify initialization tags for your cyclic
program in the startup program. You have the option of programming no, one or several
startup OBs.
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Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ