HI!

UM.. I analyze some program to learn siemens program

So I have not to understand functions

please see the attachment picture

IF "W"."12.10" and "W"."30.03" have  "1" signal state, Tag_855 has "1" signal state and

the output of the instruction has the signal state "1".

but Although this network don't have P_TRIG,  IF "W"."12.10" and "W"."30.03" have  "1" signal state,

the output of the instruction has the signal state "1".

So I don't understand why use this functions.

please tell me why use this function.

Thank you

 The output of the P_TRIG is not equal to the state of its memory bit - in your case Tag_855.

If the CLK switches from FALSE to TRUE, then the output is set to TRUE, but only till next scan. Then it is set to FALSE.

Definition of P_TRIG in pseudo language looks like this:

If NOT CLK then memory_bit:=  FALSE, Q:=FALSE

If (CLK AND NOT memory_bit) then memory_bit:=TRUE, Q:=TRUE

If (CLK AND memory_bit) then Q:=FALSE

Thank you for your answer

but unfortunately I don't understand your answer

first, Did you tell me "The output of the p_trig is not equal to the state of its memory bit" mean that

P_TRIG "TAG_855" is not equal sub IN1 "TAG_854" ??

second, but only still next scan. then it is set to false.

Did comment mean It is set to false after only one cycle next scanning ?

Third, If not CLK then memory bit = False, output False... I have didn't understand this answering.

I m really sorry for inconvenience

please tell me about that inquires

thank you!

Hi

the signal after the P_TRIG is true only during the positive edge of the three previous contacts.

workerworker

first, Did you tell me "The output of the p_trig is not equal to the state of its memory bit" mean that

P_TRIG "TAG_855" is not equal sub IN1 "TAG_854" ?? No, the output of the P_TRIG is the Q "terminal" which in turn is connected to EN of the SUB.

second, but only still next scan. then it is set to false.

Did comment mean It is set to false after only one cycle next scanning ? Yes.

 

Thank you so much

I appreciate your answering !