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function blocks

1 article tagged “function blocks”.

Flat vector diagram of three TIA Portal Function Blocks each linked to their own Instance Data Block with IN and OUT parameter arrows on an S7-1200 PLC
siemens tia portalfunction blockss7-1200

TIA Portal Function Blocks: FB, DB and Instance Data

Learn how TIA Portal Function Blocks work with Instance Data Blocks, how to pass IN, OUT and IN_OUT parameters, and the real-world gotchas that trip up even experienced S7 programmers.

Aug 8, 2026 · 8 min read

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