One Shot

One Shot is a fundamental ladder logic element or instruction used to implement control logic in PLC programs. Instruction that passes power for exactly one scan when input transitions from false to true. This instruction type enables programmers to create specific control behaviors, implement timing functions, or manage data within ladder logic programs. Understanding and properly utilizing One Shot is essential for developing effective ladder logic programs that meet application requirements.

The implementation of One Shot 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 One Shot. Common applications include sequential control, state machine implementation, and process interlocking. Effective use of One Shot contributes to clear, maintainable ladder logic programs that can be easily understood and modified by maintenance personnel.