Originally created by: barkamharikrishna

Hello all,
can anyone please help me on this issue.

I had developed an Fb and it is working fine.
Some code of FB I Need to run only once . So i am using Function block R_TRIG:
unfortunately when my R_TRIG Input is false,then R_TRIG output suppose to be false , but it is not Happening .

Many thanks in advance

Hi
The Output of R_Trig is active only for 1 cycle so you would Need to do something like this

FUNCTION_BLOCK FB_Test
VAR_INPUT
xInTrigger : BOOL;
END_VAR
VAR
fbRTrig : R_Trig;
END_VAR

fbRTrig(clk := xInTrigger);
IF fbRTrig.Q THEN
// the code that Needs to work only on Trigger
END_IF

Originally created by: barkamharikrishna

hi learnetk
thnaks for the reply,

i had placed R_Trig in if condition and the condition is not true to reset the R_Trig .
i had chnaged the code and works fine.

many thánks