CTD

The CTD object represents a DOWN COUNTER. A rising-edge on CD input will decrement the counting by one. The Q output become TRUE when the current counting value is equal or less than zero. Applying a TRUE signal on LD (LOAD) input will load the counter with the value present at input PV ( Asyncronous load ).

Plug	Description

CD	A rising-edge on this input will decrement the counter by one

LD	Applying a TRUE signal on this input will load the counter with the value present at input PV

PV	When the LD pin is asserted, the value applied to this pin will be loaded as current count value. User should use a CONST or IDENT object to enter numerical constant

Q	This output become TRUE when the counting is less or equal than zero

CV	This output reports the current counting value