The NEQ, also known as the Not Equal, instruction is used to compare two values just like the EQU Instruction. However, the key difference is that the NEQ will return TRUE if the values are not equal to each other. In other words, the outcome of this instruction is the absolute opposite of what the EQU will give us.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/plc-programming-comparison-instructions-neq-not-equal