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DB parameter variable pass to a FC from a FB

Created by: MustOne at: 8/31/2010 4:45 PM (1 Replies)

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8/31/2010 4:45 PM	Rate (0)
MustOne Posts: 22 Rating: (0)	Hi, Ilooked everywhere but I did not find appropriate answers. I like to pass a DB parameter to a FC inside a FB.The DB is a parameter passed to the FB. Below you can find the original idea, but that does not work. I tried to work with pointers, but nothing either.Noted that I should not change the entry type of FC because it is a standard block in the project. But if this is the only one way... FUNCTION_BLOCK "PH_PES" TITLE =toto AUTHOR : MRA NAME : PH_PES VERSION : 0.1 VAR_INPUT DB_BAL : BLOCK_DB ; //It is not the DB instance from the FB PH_PES. END_VAR VAR_OUTPUT END_VAR VAR_IN_OUT END_VAR VAR END_VAR BEGIN NETWORK TITLE =FC block call CALL "FC_PES" ( DBWA := DB_BAL;) END: NOP 0; END_FUNCTION_BLOCK
MustOne Posts: 22 Rating: (0)	Last edited by: MustOne at: 8/31/2010 4:47 PM tried to clean the code block. cannot put the code between [Code] label. sorry
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9/4/2010 5:59 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 5/30/2023 Posts: 2966 Rating: (1025)	MustOne I like to pass a DB parameter to a FC inside a FB.The DB is a parameter passed to the FB. Noted that I should not change the entry type of FC because it is a standard block in the project. But if this is the only one way... Hello MustOne I'm afraid to say that you are out of luck and will need to change your FC and/or your FB. Passing ofaformal Block type Parameter from an FB to an FC is nor possible (the other way round is permitted though) and attached is a pdf that shows what type of formal Parameters can be passed between FC's and FB's (you can also find this infoin the Appendix of the Step7 help). Some possible solutions for your problem are: 1.) Change the FC to an FB (and consider making it a multi instance call inside the FB) 2.) Change the FC's "Block_DB" Parameter to an INT, open the DB inside the FB, use "L DBNO" toget the DB number, tranfer it into a TEMP variable and passthis on to the FC. 2.) Change the FC's as well as the FB's "BLOCK_DB" Parameter to an INT I hope this helps Attachment Permitted Data Types when transferring Parameters.pdf (444 Downloads)
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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