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Example - Ladder Diagram

LD Execution Condition Example​

The BT instruction can be used as a LD execution condition for a contact A operation.



When the value of the specified bit, S2, is 0, the BT instruction is powered OFF.

Memory Monitor 1​


When the value of the specified bit, S2, is 1, the BT instruction is powered ON.



The coil, Y1.0, is energized.

Memory Monitor 2​

AND Execution Condition Example​

The BT instruction can be used as an AND execution condition for a contact A operation.



When the open contact, M1.0, is powered OFF AND the value of the specified bit, S2, is 0, the coil, Y1.0, is deenergized.



When the open contact, M1.0, is powered ON AND the value of the specified bit, S2, is 0, the coil, Y1.0, is deenergized.



When the open contact, M1.0, is powered ON AND the value of the specified bit, S2, is 1, the coil, Y1.0, is energized.

Memory Monitor​

OR Execution Condition Example​

The BT instruction can be used as an OR execution condition for a contact A operation.



When the open contact, M1.0, is powered OFF OR the value of the specified bit, S2, is 0, the coil, Y1.0, is deenergized.



When the open contact, M1.0, is powered ON the coil, Y1.0, is energized.



When the value of the specified bit, S2, is 1, the coil, Y1.0, is energized.


When the open contact, M1.0, is powered ON OR the value of the specified bit, S2, is 1, the coil, Y1.0, is energized.

Memory Monitor​