Siemens SIMATIC NET CP 343-1 Uživatelský manuál stáhnout pdf (Strana 40)

5 Performance Data / Operation

B−40

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

FB40 for FTP client mode

For communication via a TCP connection configured with the “Use FTP protocol”

option, use the FTP block FB40.

The block execution time in FTP depends on the reaction times of the partner and

the length of the user data; a general statement about the times is therefore not

possible.

The functions used in the predecessor modules for FTP transfer (FC40...FC44)

can continue to be used.

Additional features of FB40:

S Simplification in the user program due to working with command variable

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.

5.8 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

Depending on the transfer direction, the maximum size of arrays is as follows:

S When writing data to the CPU

164 bytes

S When reading data from the CPU

210 bytes

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.

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 79 80

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Siemens SIMATIC NET CP 343-1 Uživatelský manuál Strana 40