What are function blocks in PLC programming?

Function blocks in PLC programming are special instructions designed to encapsulate and organize complex operations or logic into a single, reusable package. This approach allows for the grouping of multiple rungs of logic within a single block, enabling structured programming and making it easier for engineers to develop, maintain, and troubleshoot control systems.

By utilizing function blocks, programmers can create modular code that simplifies the overall control architecture of the PLC. This modularity enhances readability and reusability, as these blocks can be easily replicated or utilized in different projects or applications without the need to rewrite extensive amounts of code. The use of function blocks contributes to more efficient programming practices and better management of complex logic flows, aiding operators and engineers in understanding the overall system functionality.

The other options do not accurately represent what function blocks are. Network configurations relate to how devices communicate, devices connected to a PLC refers to the physical or virtual items linked but does not define a function block, and basic input/output modules pertain to the hardware component of a PLC rather than the software logic encapsulated in function blocks.