Siemens SIMATIC S7-400H System Manual page 223

Fault-tolerant systems

Hide thumbs Also See for SIMATIC S7-400H:

Table of Contents

Time synchronization via the PROFINET interface

At the PROFINET interface, time synchronization is possible using the NTP method. The

PROFINET CPU is client.

You may configure up to four NTP servers. You can set the update interval between 10

seconds and 1 day. If times exceed an interval of 90 minutes, the PROFINET CPU requests

an NTP at cyclic intervals of 90 minutes.

If synchronizing the PROFINET CPU based on the NTP method, you should configure the

PROFINET CPU as the time master for the synchronization method in the S7-400. Select a

synchronization interval of 10 seconds.

Use FB "LT_BT" or FB "BT_LT" from the STEP 7 standard library to make allowances for a

time zone or daylight saving/standard time.

Time synchronization is also possible via Ethernet MMS as master or slave. The

combination NTP with SIMATIC method is allowed in this case.

System Manual, 03/2012, A5E00267695-11

Communication

14.1 Communication services