Chapter 3. Program Data56 PACSystems* RX7i, RX3i and RSTi-EP CPU Programmer's Reference Manual GFK-2950C3.10.3 UDT Limits▪ Maximum number of UDTs per target: 2048▪ Maximum UDT size: 65,535 bytesNote: Bit spares created to line up the end of a section of BOOL variables or arrays with the end ofa byte will count toward the maximum size.▪ Maximum number of top-level UDT elements: 1024▪ Maximum array size of a top-level UDT element: 1024 array elements▪ UDTs do not support the following:- Two-dimensional arrays- Function block data types- Enumerated data types▪ You cannot nest a UDT of one memory type in a UDT of a different memory type.▪ You cannot alias a variable to a UDT variable or UDT variable element.▪ A FAULT contact supports a BOOL element of a UDT I/O variable, but not a BOOL element of aUDT parameter in a UDFB or parameterized block.▪ POSCON and NEGCON do not support BOOL elements of UDT parameters in parameterizedblocks or UDFBs.3.10.4 RUN Mode Store of UDTsAn RMS can be performed on a target that contains a variable of a UDT, unless:▪ An operation in the UDT editor modifies the offset or bit mask of an element that has the samename before and after the operation.▪ The size of the UDT definition increases.▪ Array length increases.▪ The memory type of the UDT definition changes.▪ There is a data type change in the UDT definition, except for the following interchangeable datatypes:- WORD, INT, UINT- DWORD, DINT▪ The UDT definition is renamed.
