L9_T1: One Second Timer

Naming

Name in LL984 Editor	Function Block Name
name of legacy 984 instruction	name in other tools and editors like: Type Library Browser Data Editor Animation Tables Search Results

Function Description

The L9_T1 Timer function block measures time in 1 second intervals. It can be used for timing an event or creating a delay.

L9_T1 has 2 control inputs. The operation begins when the input to the ENABLE pin is turned ON. The ACC_TIME value increments while the RUN input remains ON. When the RUN input turns OFF, the ACC_TIME value is reset to 0.

L9_T1 can activate 1 of 2 node outputs. The EQT output turns ON if the ACC_TIME value equals the timer PRESET value; the LESSTH node turns ON if the ACC_TIME value is less than the timer PRESET value.

Representation

Parameters

Input Pin	Name	Data Type	Address Range	Meaning
Top	ENABLE	BOOL	–	OFF to ON starts the timer when RUN also is ON.
Bottom	RUN	BOOL	–	OFF resets the counter to 0; ON lets the timer execute when ENABLE is also ON.

Node	Node Type	Name	Data Type	Address Range	Meaning
Top	IN	PRESET	UINT	%IW, %MW	The maximum number of 1 second counts the timer can accumulate while counting. Can be displayed as an integer constant, or can be stored in a variable located in a %IW input word or a %MW memory word or an UINT unlocated word. Valid range: 1 to 65,535.
Bottom	IN/OUT	ACC_TIME	UINT	%MW	The actual number of counts accumulated during counting. Increments up to the preset value by a value of 1 every second. A variable tied to this pin can be located in a %MW word or an unlocated UINT word.

Output Pin	Name	Data Type	Address Range	Meaning
Top	EQT	BOOL	–	ON indicates the ACC_TIME value equals the PRESET value.
Bottom	LESSTH	BOOL	–	ON indicates the ACC_TIME value is less than the PRESET value.