SR

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 Function Block - Set dominant bistable.

Inputs

Input

Data Type

Range

Unit

Default

Description

SET1

BOOL

 

 

 

Condition for forcing to TRUE.

Highest priority command.

RESET

BOOL

 

 

 

Condition for forcing to FALSE.

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. (set dominant)

Truth Table

SET1

RESET

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

1

1

1

1

1

FBD Language Example

FFLD Language Example

  • The SET1 command is the rung.
    • The rung is the output.

IL Language Example

(* MySR is declared as an instance of SR function block *)
Op1: CAL MySR (SET1, RESET)
     FFLD  MySR.Q1
     ST  Q1

ST Language Example

(* MySR is declared as an instance of SR function block *)
MySR (SET1, RESET);
Q1 := MySR.Q1;

See Also