Function Block
A function block groups an algorithm and a set of private data. It has inputs and outputs. - 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. |
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 FALSE. (set dominant)
FBD Language
FFLD Language
- The SET1 command is the rung.
- The rung is the output.
IL Language
(* MySR is declared as an instance of SR function block *)
Op1: CAL MySR (SET1, RESET)
FFLD MySR.Q1
ST Q1
ST Language
(* MySR is declared as an instance of SR function block *)
MySR (SET1, RESET);
Q1 := MySR.Q1;
See Also
