Requirements for use
2.3 Programming
CP 343-1 ERPC
Manual, 03/2010, C79000-G8976-C239-02
13
2.3 Programming
Programming - FCs / FBs
For some communications services, there are pre-programmed blocks (FCs/FBs) available
as the interface in your STEP 7 user program.
Refer to the documentation of the FCs / FBs in the online help of STEP 7 or in the manual
/6/.
NOTICE
Current block versions
We recommend that you always use the latest block versions for all module types.
You will find information on the latest block version and links to download the current blocks
in our Customer Support area on the Internet:
Link to the blocks: (http://support.automation.siemens.com/WW/news/en/8797900
)
If you are using older block types, this recommendation only applies if you also have the
latest firmware version.
CAUTION
Block call
The communication blocks for S7300 (SIMATIC NET block libraries for S7300 in STEP 7)
must not be called in more than one priority class! If, for example, you call a communication
block in OB1 and in OB35, block execution could be interrupted by the higherpriority OB.
If you call blocks in more than one OB, you must write your program so that a
communication block that is currently executing cannot be interrupted by another
communication block (for example by disabling/enabling SFC interrupts).
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