#48 - Rockwell PLC BTD Bit Field Distribute and Bit Mask on Word

The Bit Field Distribute (BTD) instruction can be used to copy bits from one variable and write those bits to another variable. A practical application is in identifying the status of a process, when only some of the 16 bits of an INT variable are used. In the example below, the last 4 bits of value_1 are copied and written to the first 4 bits of value_2.