What are the RWB-, RB-, RW- and RWB- data type meaning in Modbus communication mode?

                                     
Device Type in DOP Standard Modbus Data Type (Address)
RWB- Coils (0x0000 to 0xFFFF)
RB- Discrete Inputs (1x0000 to 1xFFFF)
R- Input Registers (3x0000 to 3xFFFF)
RW- Holding Registers (4x0000 to 4xFFFF)