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.
Parameters:
Note: Use the F9 key 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) - Normally Closed (STRN / ANDN / ORN)
(CONTACT) - Normally Open (STR / AND / OR)
(CONTACT) Delta (STRDLT)
(CONTACT) - Negative Differential (One-shot Falling) (STRND / ANDND / ORND)
(CONTACT) - Positive Differential (One-shot Rising) (STRPD / ANDPD / ORPD)
Related Topics:
(CONTACT) - if Equal (STRE / ANDE / ORE)
(CONTACT) - if Not Equal (STRNE / ANDNE / ORNE)
(CONTACT) - if Greater Than (STRGT / ANDGT / ORGT)
(CONTACT) - if Greater Than or Equal (STRGE / ANDGE / ORGE)
(CONTACT) - if Less Than (STRLT / ANDLT / ORLT)
(CONTACT) - if Less Than or Equal (STRLE / ANDLE / ORLE)
(CONTACT) - Leading Edge Powerflow Modifier (ANDPDPF)
(CONTACT) - Trailing Edge Powerflow Modifier (ANDNDPF)
(CONTACT) - Invert Powerflow (NOT)
Rung Example:
