R_TRIG
Function Block - Rising pulse detection.
Inputs
|
Input |
Data type |
Description |
|
CLK |
BOOL |
Boolean signal. |
Outputs
|
Output |
Data type |
Description |
|
Q |
BOOL |
TRUE when the input changes from FALSE to TRUE. |
Truth table
|
CLK |
CLK prev |
Q |
|
0 |
0 |
0 |
|
0 |
1 |
0 |
|
1 |
0 |
1 |
|
1 |
1 |
0 |
Remarks
Although ]P[ an ]N[ contacts may be used in LD language, it is recommended to use declared instances of R_TRIG or F_TRIG function blocks in order to avoid unexpected behaviour during an Online change.
ST Language
MyTrigger is declared as an instance of R_TRIG function block:
MyTrigger (CLK);
Q := MyTrigger.Q;
FBD Language
LD Language
The input signal is the rung - the rung is the output:
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R_TRIG |
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IEC 61131-3 Automation platform > Programming - Reference guide > Boolean Operations > R_TRIG |
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