Hello,

Please, is it also bad practice in Step7 v5.6? Is there any risk, if I use READ access to instace DB output values?

Thank you very much.

0_Einstein

It is generally considered bad practice (per the Siemens TIA Portal Programming and Style Guide) to access iDB tags directly.

eltiu

Hello:

Is it a good programming practice to use the instance data blocks in the general program? I attach a picture to be clearer.

For example, if inside an FB we have an input bool like "enable", then, when we call the FB we can linnk to the block input the global variable to this FB-input. However, we could do it directly to the instance-DB, because we could "save" a data block..

Thanks

 

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Split from Using instance data blocks in general program.