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9 File Management and File Access with FTP
9.4.4
FCs and FBs for FTP services
Using the blocks
For data transmission using FTP, the user program uses either FC40...44 or FB40.
Depending on the module type of the Advanced CP, either FC40...44 or FB40 can
be used in the user program:
S FB40
FB40 is available as of STEP 7 V5.4 SP4. It can be used as of the following
module types:
− As of CP 343−1 Advanced (GX30)
− As of CP 443−1 Advanced (GX20)
These module types continue to support FC40...44.
The module types listed below, on the other hand, do not support FB40:
− Advanced CPs up to CP 343–1 Advanced (GX21)
− Advanced−CPs up to CP 443–1 Advanced (EX41)
S FC40...44
The FCs can be used with all Advanced CPs.
Using FB40 has the following advantages:
S Simplification in the user program due to working with command variables
instead of differing function calls
S Additional function "APPEND"
"APPEND" allows data to be appended to an existing file.
S Additional function "RETR_PART"
"RETR_PART" allows data areas to be selected and read from a file.
Further information
The blocks are described in detail in /10/. There, you will also find sample
programs.
A−228
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 07/2010
C79000−G8976−C182−10
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