The Modbus bit address areas 0X and 1X from bit 16 to 2047 can be freely compiled by the user. Almost any regular bit data in the Modbus memory map can be made to appear as a bit data copy in this UDB memory area. The regular Modbus source bit data are not moved away from their original location and thus they can be read also from the original location.
Note: Bit 16 is the first valid bit address in the address space because the register and bit addresses overlap and the register addresses start from the register location 1. The bit address 16 is the same as register 1, bit 0.