SR
Function Block - Set dominant bistable.
Inputs
|
Input |
Data type |
Description |
|
SET1 |
BOOL |
Condition for forcing to TRUE (highest priority command). |
|
RESET |
BOOL |
Condition for forcing to FALSE. |
Outputs
|
Output |
Data type |
Description |
|
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
LD Language
The SET1 command is the rung - the rung is the output:
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