GE PACSystems RX7i Cpu Programmer's Reference Manual page 268

Chapter 5. Function Block Diagram (FBD)
Function Description
Move From Flat. Copies reference memory data to a UDT variable or
UDT array. Provides the option of locking the symbolic or I/O variable
memory area being written to during the copy operation.
For details, refer to Data Move Functions in Chapter 4.
Move to Flat. Copies data from symbolic or I/O variable memory to
reference memory. Copies across mismatching data types.
For details, refer to Data Move Functions in Chapter 4.
Size Of. Counts the number of bits used by a variable.
For details, refer to Data Move Functions in Chapter 4
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