Not Equal

Not Equal is a fundamental ladder logic element or instruction used to implement control logic in PLC programs. Comparison contact that passes power when two values are different. This instruction type enables programmers to create specific control behaviors, implement timing functions, or manage data within ladder logic programs. Understanding and properly utilizing Not Equal is essential for developing effective ladder logic programs that meet application requirements.

The implementation of Not Equal 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 Not Equal. Common applications include sequential control, state machine implementation, and process interlocking. Effective use of Not Equal contributes to clear, maintainable ladder logic programs that can be easily understood and modified by maintenance personnel.