Attention

IronPLC supports IEC 61131-3 Structured Text excluding I/O mapping.

Program Organization Units

IEC 61131-3 programs are structured into program organization units (POUs): programs, function blocks, and functions. These are deployed within a configuration containing resources and tasks.

Unit	Description
PROGRAM	Top-level executable unit
FUNCTION	Stateless callable unit with return value
FUNCTION_BLOCK	Stateful callable unit with inputs and outputs
CONFIGURATION	Top-level deployment container
RESOURCE	Processing resource within a configuration
TASK	Execution scheduling unit