L9_ADD: Addition

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_ADD procedure adds unsigned VALUE1 to unsigned VALUE2, then posts the result of the addition into a variable tied to SUM.

The addition operation begins when the input to the ENABLE pin is turned ON. If the OVERFL output turns ON, an overflow in the SUM is indicated. An overflow results when the addition produces a SUM greater than 9,999.

Formula

SUM = VALUE1 + VALUE2

Representation

Parameters

Input Pin	Name	Data Type	Address Range	Meaning
Top	ENABLE	BOOL	–	OFF to ON initiates the operation.

Node	Node Type	Name	Data Type	Address Range	Meaning
Top	IN	VALUE1	UINT	%IW, %MW	The first value to be added. Can be displayed as an integer constant, or can be stored in a variable located in a %IW input word, a %MW memory word or an unlocated word. Valid range: 0 to 65,535.
Middle	IN	VALUE2	UINT	%IW, %MW	The second value to be added. Can be displayed as an integer constant, or can be stored in a variable located in a %IW input word, a %MW memory word or an unlocated word. Valid range: 0 to 65,535.
Bottom	IN/OUT	SUM	UINT	%MW	The sum of addition. The variable tied to this node can be located in a %MW memory word or an unlocated UINT word.

Output Pin	Name	Data Type	Address Range	Meaning
Top	OVERFL	BOOL	–	ON indicates a sum overflow: SUM > 9,999. SUM will display an accurate overflowed value up to 19,998 (9,999 + 9,999).