Siemens SIMATIC NET CP 343-1 Uživatelský manuál stáhnout pdf (Strana 14)

2 Requirements for Use

B−14

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

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.

Please refer to the documentation of the FCs / FBs in the online help of STEP 7 or

in the manual /63/.

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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Siemens SIMATIC NET CP 343-1 Uživatelský manuál Strana 14