Topic: DMD0042
(CONTACT) - Negative Differential
When the assigned Bit transitions from ON to OFF, the Negative Differential contact Closes for one complete PLC scan, allowing power flow. Regardless of the state of the assigned bit, the contacts Open on the following scan, interrupting power flow.
Hotkey: Shift-F3
Mnemonic (seen in Import, Export, Find, and Program Compare): STRND, ORND, ANDND
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 selects the Bit location to use. This can be any readable bit location.
See Also:
(CONTACT) - Negative Differential (One-shot Falling)
(CONTACT) - Positive Differential (One-shot Rising)
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:
