XOR

The XOR logic function block can evaluate the state of two integers to see if input A and B are equal. If either input A OR B is true - the output C will be true (logic 1). If both input A and B are true (logic 1) - the output C will be false (logic 0). If both input A and B are false (logic 0) - the output C will be false (logic 0).

The input values in a XOR function may be:

• Memory Integer (MI)

• Memory Long Integer (ML)

• Double Word (DW)

• System Operands:(SI) (SL) (SDW)

• Network System Integer (NSI)

• Constant Value #

With the exception of Constant Value, any of these operands may be used to contain the output value.

Use XOR to recognize changes in an integer to check for integer bit corruption. If 2 integers are equal: the result will return logic 0. If there has been bit corruption: the corrupted bit will return logic 1.

The function is located under the Logic menu on the Ladder toolbar.