What data types and structures are used in modern PLC programming?

Modern PLC data types: Elementary - BOOL (single bit), BYTE/WORD/DWORD/LWORD (8/16/32/64 bits), INT/DINT/LINT (signed integers), UINT/UDINT/ULINT (unsigned), REAL/LREAL (floating point), TIME/DATE/TOD/DT. Compound - ARRAY (indexed collection), STRING (text), STRUCT (user-defined type grouping multiple elements), and FB instances. Using appropriate data types ensures memory efficiency and program clarity. Structures (UDTs) group related data - motor data structure containing speed, current, status bits - enabling modular programming and reusability.