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Help in the STEP 7 information system
You will find the required information in the STEP 7 information system with the following
search term:
• Creating a standard machine project
Changing address parameters at runtime
After the standard machine has started up, you can adapt the preset address parameters
using the following methods:
• Using the following STEP 7 commissioning tools:
– SINEC PNI
– PRONETA
• From the user program using the program block "IP_CONFIG"
• Using the program block "T_CONFIG"
4.4
Media redundancy
You can use the CM in a ring topology with media redundancy.
For more detailed information on configuration, refer to the STEP 7 online help of the "Media
redundancy" parameter group.
4.5
Time-of-day synchronization
Note
Recommendation for setting the time
Synchronization with a external clock at intervals of approximately 10 seconds is
recommended. This achieves as small a deviation as possible between the internal time and
the absolute time.
Procedure
When the option is enabled the CM sends timeofday queries at regular intervals to an NTP
server and synchronizes its local time of day.
The time is also be forwarded automatically to the CPU modules in the S7 station allowing the
time to be synchronized in the entire S7 station.
The CM supports the following mode for time-of-day synchronization:
• NTP (NTP: Network Time Protocol)
Four NTP servers can be configured in STEP 7.
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
Configuration, program blocks
4.4 Media redundancy
41
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