RS

 Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Reset New start of the microprocessor. dominant bistable.

Inputs

Input	Data Type	Range	Unit	Default	Description
SET	BOOL				Condition for forcing to TRUE.
RESET1	BOOL				Condition for forcing to FALSE. Highest priority command.

Outputs

Output	Data Type	Range	Unit	Description
Q	BOOL			Output to be forced.

Remarks

• The output is unchanged when both inputs are FALSE.
• When both inputs are TRUE, the output is forced to FALSE. (reset dominant)

Truth Table

SET	RESET1	Q1 prev	Q1
0	0	0	0
0	0	1	1
0	1	0	0
0	1	1	0
1	0	0	1
1	0	1	1
1	1	0	0
1	1	1	0

FBD Language Example

FFLD Language Example

IL Language Example

(* MyRS is declared as an instance of RS function A function calculates a result according to the current value of its inputs. 
A function has no internal data and is not linked to declared instances. block *)
Op1: CAL MyRS (SET, RESET1)
     FFLD  MyRS.Q1
     ST  Q1

ST Language Example

(* MyRS is declared as an instance of RS function block *)
MyRS (SET, RESET1);
Q1 := MyRS.Q1;

See Also

• R
• RS
• SR