The XIC, also known as Examine If Closed, instruction is one of the fundamental instructions used in ladder logic programming for Programmable Logic Controllers (PLCs). This instruction is always found on the left side of a ladder rung and will verify if the specified bit is in a logic HIGH state. If that’s the case, the instruction will evaluate to true and allow the rest of the rung to execute.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/plc-programming-fundamentals-xic-instruction