Controlling The Mode - Siemens SIMATIC NET S7-400 Manual

Configuration and operation

6.2 Controlling the mode

● Authentication
Specifies whether the communication partner is authenticated.
● Encryption
Specifies whether the transfer is encrypted.
Ports of communication partners and routers
Make sure that you enable the required client ports in the corresponding firewall on the
communications partners and in intermediary routers.
These can be:
● DHCP / 67, 68 (UDP)
● (S)NTP / 123 (UDP)
6.2 Controlling the mode
You can change the mode of the CP between RUN and STOP using the STEP 7
configuration software or using STEP 7 special diagnostics.
Change from STOP to RUN:
The CP loads configured and/or downloaded data into the work memory and then changes
to RUN mode.
Change from RUN to STOP:
The CP changes to STOP (transitional phase with LED display "Stopping").
The reaction is as follows in STOP:
● Established connections (ISO transport, ISOonTCP, TCP, UDP connections) are
terminated
● The following the functions are disabled:
– Time-of-day synchronization
– PROFINET IO
● The following functions remain enabled:
– The configuration and diagnostics of the CP (system connections for configuration,
– Web diagnostics
– FTP access to the file system
– HTTP access
– Routing function
46
diagnostics, and PG channel routing are retained);
CP 443-1 (EX30)
Manual, 03/2019, C79000-G8976-C255-05