Done Bit

Done Bit is a fundamental ladder logic element or instruction used to implement control logic in PLC programs. Status bit that turns on when timer reaches preset or counter reaches target. This instruction type enables programmers to create specific control behaviors, implement timing functions, or manage data within ladder logic programs. Understanding and properly utilizing Done Bit is essential for developing effective ladder logic programs that meet application requirements.

The implementation of Done Bit follows established conventions and best practices for ladder logic programming. Programmers must consider scan time impacts, proper placement within ladder rungs, and interaction with other instructions when using Done Bit. Common applications include sequential control, state machine implementation, and process interlocking. Effective use of Done Bit contributes to clear, maintainable ladder logic programs that can be easily understood and modified by maintenance personnel.