PLC Programming EQU NEQ Compare Instructions - Equal Not Equal Instruction RSLogix Studio 5000

PLC Programming EQU NEQ Compare Instructions - Equal Not Equal Instruction RSLogix Studio 5000
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The EQU, also known as the Equal, instruction is used to compare two values. The EQU instruction is an input instruction which will return TRUE if the two values within “Source A” and “Source B” fields are equal to each other. If that condition is met, the instruction will allow what’s on the right of it to execute. The EQU will compare the two values and only evaluate to true is the two integers are equal. Should they become unequal, the instruction will update on the next PLC scan.
The EQU instruction is critical within the Automation world as it’s the only way to see if the values are completely identical. It’s commonly used to check if a certain limit has been met, if a counter reached a certain value or if a certain alarm has been triggered.
The instruction is very versatile as you can use integers, floats and even user-defined tags in certain programming environments as operands. Furthermore, you may choose to use to enter a fixed value instead of an operand tied to a tag. That being said, this isn’t the recommended practice as you’ll need to edit the program and commit the edit if you want to change the said value.
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.
Just like the EQU, this instruction is critical in the control systems world. It provides an easy way to check whether a certain value is holding the value we expect and act based on the outcome.
The NEQ may operate on the exact same operands as the EQU. In fact; the only difference between the two is that their output state is inverted; just as stated above.
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[@patilprashanth1]

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