STEP 7 (TIA Portal) differentiates between local and global user constants that you can define in the block interface or in the PLC tags. Open the block in the S7-SCL programming language, in this example FC1. Escape will cancel and close the window. you pass data to the FB & after modification you pass it back out to the global program. You use this FB to achieve specific functionality through the pieces of code written inside. When calling a function block into your code you will be asked to assign a data block also called data instance to be associated with. TIA Portal is a software and tools package developed by Siemens, which aims to integrate multiple development tools for automation devices from the unification and remodelling of preexisting software such as Simatic Step 7, Simatic WinCC, and Sinamics Starter. The environments are responsible for. Function Blocks (FB) in Siemens TIA Portal are reusable code structures that permanently store their input, output, and in-out parameters in associated instance data blocks (DBs).
