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Example - Ladder Diagram

EI​


The EI instruction enables an interrupt program with the ID, n.

Ladder Diagram Example​

This is the periodic interrupt program for the ID 1.


When the contact, M1.0, is powered ON (1), the data register, D1, does NOT increase with the INCP instruction since the periodic interrupt program is NOT being executed in the main scan program.


This is the program for the ID 0, or main program.


When the contact, M0.0 is powered OFF (0), the EI instruction is not executing the periodic interrupt program with the ID 1 to enable it.



When the contact, M0.0 is powered ON (1), the EI instruction executes the periodic interrupt program with the ID 1 to enable it.



Since the EI instruction is executing the periodic interrupt program with the ID 1, the data register, D1, is increasing.