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Function BlockClosedA function block groups an algorithm and a set of private data. It has inputs and outputs. - Set dominant bistable.

Inputs

SET1  : BOOL Condition for forcing to TRUE (highest priority command)
RESET : BOOL Condition for forcing to FALSE

Outputs

Q1     : BOOL Output to be forced

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

Remarks

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

ST Language

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

FBD Language

SrFbd.gif (1307 octets)

FFLD Language

(* the SET1 command is the rung - the rung is the output *)
SrLd.gif (1460 octets)

IL Language:

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

See also

R   S   RS