OneShot ONS Strutured text

[BiteBytesButes]

Hi all,

With ControlLogix, I know that we can do something similar to ONS in Strutured text, I cannot remember how to make. It is something like repeat the tag in the code....
Any help would be appreciated.

Thank you
BBB

 

[Geoff White]

You can use an OSRI instruction or you can code your own logic
pulse := Condition and not ConditionOLD;
ConditionOLD:=Condition;

 

[kittydog42]

There should be a function block called R_TRIG.

You'd first define it as a variable.

VAR
One_Shot :R_TRIG;
END_VAR

To activate you reference the CLK input.

One_Shot(CLK:=Some_Bool_Input);

To use the one-shot output, reference Q.

IF One_Shot.Q THEN
...
END_IF

 

[BiteBytesButes]

Thank you, I'll try that