Chapter 5 POU and Task The icons representing POUs are described below. *. Please refer to section 5.4.2 for more information about enabling a POU. Please refer to the following section for more information about tasks. 5-5 Icon Description The POU is a ladder diagram (LD). The POU is an instruction list (IL). The POU is a function block diagram (FBD). The POU is a structured text (ST). The POU is a sequential function chart (SFC). The POU is a continuous function chart (CFC). The object is a POU created in C language. If the icon representing a POU is gray, the POU is disabled. A POU which is disabled is skipped when the program is compiled, and is not executed.
If the icon representing a POU is marked with a red cross, the POU is not assigned to any task. A POU which is not assigned to any task is skipped when the program is compiled, and is not