2 Requirements for Use
B−12
CP 343-1 Lean for Industrial Ethernet / Manual Part B
Release 09/2009
C79000-G8976-C198-06
Notice
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:
http://support.automation.siemens.com/WW/news/en/8797900
With the older module types, this recommendation assumes that you are using the
latest firmware for the particular block type.
Caution
The communication blocks for S7-300 (SIMATIC NET block libraries for S7-300 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 higher-priority 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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