Topic: DMD0066
PD - Leading Edge One-Shot
When the input logic generates an OFF to ON transition, the Leading Edge One-Shot (PD) instruction will turn ON the specified discrete location for one complete scan.
Note: use the Leading Edge Powerflow Modifier to generate a single one-shot event for multiple output instructions without requiring the use of a bit memory location.
Instruction Inputs:
The standard Leading Edge One-Shot (PD) has one ladder logic input.
The gray triangle at the right end of the input leg indicates this input is edge-triggered, meaning that each time the instruction's input logic transitions from OFF to ON, the specified bit location will be ON for one complete scan.
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.
Pulse - specifies the bit memory location to use. This can be any writable bit location.
See Also:
Related Topics:
(CONTACT) - Negative Differential (One-shot Falling) (STRND / ANDND / ORND)
(CONTACT) - Positive Differential (One-shot Rising) (STRPD / ANDPD / ORPD)
(CONTACT) - Leading Edge Powerflow Modifier (ANDPDPF)
(CONTACT) - Trailing Edge Powerflow Modifier (ANDNDPF)
(CONTACT) - Invert Powerflow (NOT)
Example:
