Time Synchronization - Siemens SIMATIC S7-1500 System Manual

Commissioning

11.7 Time synchronization

The following texts are also loaded into the CPU in the selected languages with the project
languages, but are not used by the CPU display:
• Comments in tag tables (for tags and constants)
• Comments in global data blocks
• Comments of elements in block interfaces of FBs, FCs, DBs and UDTs
• Network titles in blocks written in LAD, FBD or STL
• Block comments
• Network comments
• Comments of LAD and FBD elements
The S7-1500R/H CPUs support archiving of multilingual project texts in up to three different
project languages. If the project texts for a project language nevertheless exceed the memory
space reserved for them on the SIMATIC memory card, the project cannot be downloaded to
the CPU. The download is aborted with a notice that not enough memory space is available.
In such a case, take measures to reduce the required storage space, for example by
shortening comments.
NOTE
SIMATIC memory card
Make sure that there is enough available storage space on your SIMATIC memory card for
downloading projects.
In order to be able to download and back up projects, the project size and the size of files on
the SIMATIC memory card may not exceed 2 GB.
Do not manipulate any contents in the OMSSTORE folder on the SIMATIC memory card.
You can find information on reading out the memory usage of the CPU and the SIMATIC
memory card in the Structure and Use of the CPU Memory
(https://support.industry.siemens.com/cs/de/de/view/59193101/en) Function Manual.
You can find information on parameter assignment of multilingual project texts in STEP 7 in
the STEP 7 online help.
11.7 Time synchronization
Introduction
All S7-1500R/H CPUs have an internal clock. The clock shows:
• The time of day with a resolution of 1 millisecond
• The date and the day of the week
The CPUs take into account the time change caused by daylight saving time.
In redundant mode, the two CPUs of the S7‑1500R/H redundant system constantly
synchronize their internal clocks.
You can synchronize the time of the CPUs using the NTP procedure.
302
S7-1500R/H redundant system
System Manual, 11/2022, A5E41814787-AD