RS

Reset/set

The function block RS (reset/set) allows you to both reset and set an output.

Parameters

Input

S (BOOL)

Set

The output Q1 is set for each rising edge at S if RESET is not set.

R1 (BOOL)

Reset

The output Q1 is reset for each rising edge at R1.

Output

Q1 (BOOL)

set if a rising edge is detected at S and if R1 is not set
reset if a rising edge is detected at R1.
reset if a rising edge is detected at both inputs.

Time chart

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		copy_name: RS;
		set: BOOL:=FALSE;
			(*output_value is set for each
rising edge at set_input,
if reset_input is not set*)
		reset: BOOL:=FALSE;
			(*output_value is reset for each
rising edge at reset_input*)
		signal_output: BOOL:=FALSE;
	END_VAR

LD body

If set is set (status = TRUE) the signal_output will be set. If only reset is set, the signal_output will be reset (status = FALSE). If both set and reset are set, the signal_output will be reset to FALSE.

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_FB,RS!,copy_name,9,1,14,5,,?BS?BR1?AQ1);
B(B_VAROUT,,signal_output,14,2,16,4,);
B(B_CONTACT,,set,3,1,5,3,);
B(B_CONTACT,,reset,3,3,5,5,);
L(1,2,3,2);
L(1,4,3,4);
L(1,0,1,5);
L(5,2,8,2);
L(8,2,8,3);
L(8,3,9,3);
L(5,4,9,4);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

copy_name( SET:= set, RESET:= reset);
        signal_output:= signal_output;