Memory Usage For Data Logging; Overview Of Data Logging - Siemens S7-1500 Function Manual
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Also See for S7-1500:
- System manual (523 pages) ,
- Function manual (402 pages) ,
- Manual (188 pages)
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3.2
Memory usage for data logging
3.2.1
Overview of data logging
With data logging, you save selected process values from the user program in a file, the data
log. The data logs are saved on the SIMATIC memory card in csv format and stored in the
"\datalogs" directory. A web browser can read data via the web server of the CPU, even
when the CPU is in STOP state. You can also directly access the data of the SIMATIC
memory card using a card reader on the programming device.
NOTICE
Service life of the SIMATIC memory card
Only a limited number of delete and write operations are possible on the SIMATIC memory
card. Cyclic write operations to the SIMATIC memory card by the user program reduce the
service life of the SIMATIC memory card. After expiration of the service life, there is a risk
that the card can no longer be used. Therefore, use a SIMATIC memory card with sufficient
memory for your particular purposes.
Information on the service life of the SIMATIC memory card can be found in the section
Service life of the SIMATIC memory card (Page 68).
The "data logging" instructions may be used in your program to create, open, write, and
close data logs. You decide which tags are logged by creating a data block that defines a
single data log data record. Your data block is used as temporary storage for a new data log
data record. New current values for the tags must be transferred into the data block during
runtime by means of user program instructions. If all tag values have been updated, you can
execute the "DataLogWrite" instruction, in order to transfer data from the data block into the
data log.
You manage your data logs with the integrated web server. You can download data logs
from the standard "File Browser" website. After you have transferred a data log to your PC,
you can analyze the data using popular spreadsheet programs, e.g. Microsoft Excel.
Note
Redundant system S7-1500R/H
Data logging is not supported by the CPUs of the redundant system S7-1500R/H.
Structure and Use of the CPU Memory
Function Manual, 10/2018, A5E03461664-AC
Memory usage and application examples
3.2 Memory usage for data logging
43
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