2. Common objects
Here we present the common features and objects of the programming database. Such objects can be used in any POU (program organization unit: programs, functions or function blocks) written in any SFC, FC, FBD, IL, ST or LD language.
2.1 Data types
Any expression, constant or variable used in a POU (written in any language), must be characterized by a type. Type consistency must be respected in graphical operations and textual instructions.
Types are known by all project resources: types have a common scope. These types are :
IEC 61131 standard types ;
user types (based on basic types).
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Common objects
SFC language
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