Configuration And Operation; Controlling The Mode; Security Recommendations - Siemens SIMATIC S7-400 Operating Instructions Manual

Configuration and operation

4.1

Controlling the mode

Changing the mode
You can change the mode of the CP between RUN and STOP using STEP 7 or using
STEP 7 special diagnostics.
STOP → RUN
During startup, the CP adopts configured and/or downloaded data in the work memory and
then changes to RUN mode.
RUN → STOP
The CP changes to STOP (transitional phase with LED display "Stopping").
The reaction is as follows in STOP:
● Established connections (OPC UA) are terminated
● The following the functions are disabled:
– Time-of-day synchronization
● The following functions remain enabled:
– The configuration and diagnostics of the CP (system connections for configuration,
– Web diagnostics
4.2

Security recommendations

Keep to the following security recommendations to prevent unauthorized access to the
system.
General
● You should make regular checks to make sure that the device meets these
recommendations and other internal security guidelines if applicable.
● Evaluate your plant as a whole in terms of security. Use a cell protection concept with
suitable products.
● Do not connect the device directly to the Internet. Operate the device within a protected
network area.
CP 443-1 OPC UA
Operating Instructions, 01/2017, C79000-G8976-C427-02
diagnostics, and PG channel routing are retained);
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