Latch Coil

Latch Coil is a fundamental ladder logic element or instruction used to implement control logic in PLC programs. Output that remains energized after input goes false, requiring separate unlatch command to reset. This instruction type enables programmers to create specific control behaviors, implement timing functions, or manage data within ladder logic programs. Understanding and properly utilizing Latch Coil is essential for developing effective ladder logic programs that meet application requirements.

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