Siemens S7-1500 Operating Instructions Manual page 51

Reading/writing via DBs of the CPU
To transfer data with FTP via data blocks, create the required DBs in the CPU. Due to their
special structure, these are known as file DBs.
When it receives an FTP command, the CP acting as FTP server queries its assignment
table to find out how the data blocks used for file transfer in the CPU will be mapped to files.
You make the data block assignment in the STEP 7 configuration of the CP (FTP
configuration).
Figure 4-1
DB assignment in STEP 7
The fields of the table in the data block assignment in STEP 7 have the following meaning
and syntax:
Column title CPU
Meaning Assignment of the CPU
Selectable from drop-
down list
Example cpu1 [PLC_1]
CP 1543-1
Operating Instructions, 05/2017, C79000-G8976-C289-07
S7 CPU with CP 1543-1 as FTP server for the S7 CPU data
DB
No. of the data block
(file DB)
Selectable from drop-
down list
20
Configuration, programming
4.7 Setting up FTP communication
File name
The file name assigned
to the file DB
Automatic name pro-
posal; entry can edita-
ble.
cpu1_db20.dat
Comment
Informal comment
Measured values plant
1
51