Hello friend's . I have a big problem ( for me ) . I use pcs7 with cfc.
I need to move a real value from a data block to another with a trigger.
I need also to overwrite the out value from wincc.

For example i need to move a DB10.DBD0 to DB20.DBD14 when a I3.5 is true, But only "one shoot" because DB20.DBD14 is accessible from supervision WCC. I have create a little FB (see attachment) to do this, but the out value linked to DB20.DBD14 is every write and it's no possible to change value from WCC.
In other word, when I3.5 is true i need to restore a default value in to operator field value

Can you help me ?

thank you in advancce

thank you a lot !!! working, but i don't know how to do to change attribute "s7_link" ...

thank you again

cabreytj

See attached.

The key here is to use the IN_OUT function of the OP_A.U parameter (note need to modify S7_link attribute to true). The U parameter only writes backwards (i.e. move functionality)when written to inside the block. This happens when the LINK_ON is true, writing the LINK_U value to the U parameter. Which in-turns writes to the data block. When LINK_ON is false the U parameter just reads the data block, so the value can then be changed freely by WinCC/HMI.

For your case DB10.DBD0 would be connected to LINK_U and DB20.DBD14 would be connected to U.

cabreytj

Hi.

Please send standard CFC ( OP_A ) number available???
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Hello AutoGen_1048067,

this post is from a old PCS 7 Version, so the PCS 7 V7.0 Library with the block OP_A (FB 45) was used.

Why do you want to move the real value? The application example Fast archiving of process data in SIMATIC PCS 7 with AR_SEND offers a solution for transfer the data from the AS to WinCC via variable trigger.

With regards
Heisenberg