PLC, PAC & Controller Siemens

Siemens TIA Portal program blocks

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With most of the program finished, we will be branching out to other types of program blocks.

Simatic STEP 7 supports four program blocks, as shown below, you are familiar with one of them already, the Organization block (OB). The others are as follow:

  • Organization Block (OB): The main programming block that incorporate networks and components that drive specific tasks. More discussions later.
  • Function block (FB): Create function blocks. More discussions later.
  • Function (FC): A subroutine that perform a specific task, this block is called by the organization block.
  • Data block (DB): An archive where a different set of tags and data are stored; it is used withfunctions.

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