Dear Expert,

my project  use CPU s7-300(315-2 PN/DP). when i simulate have some issue:

in FB . %DB1DBX0.0 value is True.

but in DB. %DB1.DBX0.0 value is False.

Pls view attached file and give me advise.

Vinh Vũ

Regards.

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Split from TIA Portal simulation for S7-300.

Hello,

probably problem in your code, check all code if some other tag doesn't affect your DB bit. Look to next lines of DB, there you have some tag with true without problems. Also when you look to your second Picture, on top I see some condition with check of bit and at same time maybe set/reset same bit as output. This looks like you have other not correct code in other place of program.

Duris_I

Hello,

probably problem in your code, check all code if some other tag doesn't affect your DB bit. Look to next lines of DB, there you have some tag with true without problems. Also when you look to your second Picture, on top I see some condition with check of bit and at same time maybe set/reset same bit as output. This looks like you have other not correct code in other place of program.

 Hi Duris_I,

Thanks for your advisement. My code wrong. Some bit exist the other FB. i modified and code was working. ^^