Topic: DMD0041
(CONTACT) - Delta
The Delta contact mimics the behavior of a momentary, normally open relay as follows:
When the state (if a bit location is used) or value (if a numeric location is used) of the assigned element is NOT equal to the state (or value) of that element from the previous scan the contact is Closed, allowing power flow.
When the state (if a bit location is used) or value (if a numeric location is used) of the assigned element is equal to the state (or value) of that element from the previous scan the contact is Open, interrupting power flow.
Mnemonic (seen in Import, Export, Find, and Program Compare): STRDLT
Parameters:
Note: Use the F9 key or click the 'three dot box' at the right edge of the parameter field to open the Default Element Selection Tool (the Element Picker or the Element Browser) or use the Down-Arrow key (Auto-Complete) on any parameter field to see a complete list of the memory locations that are valid for that parameter of the instruction.
Element specifies the numeric or bit memory location to monitor. This can be any readable bit location or numeric location.
See Also:
(CONTACT) - Negative Differential (One-shot Falling)
(CONTACT) - Positive Differential (One-shot Rising)
(CONTACT) - Delta
Related Topics:
Relational (CONTACT) - if Equal
(Relational CONTACT) - If Not Equal
(Relational CONTACT) - If Greater Than
(Relational CONTACT) - If Greater Than or Equal
(Relational CONTACT) - If Less Than
(Relational CONTACT) - If Less Than or Equal
(CONTACT) - Leading Edge Powerflow Modifier
(CONTACT) - Trailing Edge Powerflow Modifier
Rung Example:
