Siemens SIMATIC NET CP 443-1 Advanced, Руководство пользователя

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Performance data
2.9 Characteristic data of TCP connections for HTTP / HTTPS
CP 443-1 Advanced (GX30)
Manual, 03/2019, C79000-G8976-C256-05
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The block execution time in FTP depends on the reaction times of the partner and the length
of the user data. A generally valid statement is therefore not possible.
Older program blocks for FTP client mode
The program blocks used in the predecessor modules for FTP transfer can continue to be
used.
● FTP_CONNECT, FTP_STORE, FTP_RECTRIEVE, FTP_DELETE, FTP_QUIT
Restriction: FTPS mode is not possible with these program blocks even when the security
functions are enabled..
2.9 Characteristic data of TCP connections for HTTP / HTTPS
Characteristic data of TCP connections for HTTP / HTTPS
For HTTP access, up to 32 TCP connections are available. When necessary, these TCP
connections are used by one or more Web browsers to display data or files of the CP.
2.10 Characteristic data for the use of Java applets
To transfer larger amounts of data efficiently from the S7BeansAPI using Java applets and
the Java bean "S7Variable", you can make use of arrays.
Maximum array size
The maximum array size for the CP 4431 Advanced
● is 400 bytes when writing data to the CPU and
● 400 bytes when reading data from the CPU.
Note
Please note that the maximum block size in bytes is specified here and that the maximum
number of array elements is decided by the byte size of the array basic data type.
Example
The CP 4431 Advanced can transfer a maximum of 100 array elements of the type DWORD
or REAL with a read job since each element of the type DWORD or REAL occupies four
bytes.