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Example - Ladder Diagram

DDEC​


The DDEC instruction decreases the assigned DWORD data register, D, by 1 until the execution condition is OFF.

Ladder Diagram Example​


When the contact, M0.5, is powered ON, the value of the WORD data register, D30, decrements by 1 every scan.



This is the result after deenergizing the coil, M0.5.


Memory Monitor​

DDECP​


The DDECP one-shot instruction decreases the assigned DWORD data register, D, by 1.
Every time this instruction executes, it energizes the output only once.

Ladder Diagram Example​


When the contact, M0.5, is powered ON, the value of the WORD data register, D30, decrements by 1 every scan.


Memory Monitor​