ST Language

[psm2001 0]

Where i can find the sintax and instrutions of Function Blocks ST Language?

[Jay Anthony 118]

This is the quickstart. I'll see if I can find the operation manual for FB-ST. Intro to FB @ MrPLC.com

[Guest anonymous]

Try Help \ Index \ Structured Text Commands. There is a list of supported commands there, complete with examples, which show construction, syntax, and give an explanation of how they work. Unfortunately, the examples given in the help, is incomplete, as there are no examples for the numerical functions... i.e. Any_REAL := SIN (MyREAL) ; If I can find time, I'll try to put together a list of examples...

[Guest anonymous]

Here is a list of the Numerical functions that are not given examples in the Help. (Did you find the others in the Help?). VAR1 := ABS (VAR2) ; Returns absolute value (Negative becomes positive). VAR1 and 2 can be Any_INT or Any_REAL (both must be the same) For SQRT, LN, LOG, EXP, SIN, COS, TAN, ASIN, ACOS, or ATAN... VAR1 := SQRT(VAR2) ; VAR1 and 2 can be Any_REAL (both must be the same) SQRT – Returns Square Root LN – returns Natural Log LOG – returns Logarithm EXP – returns Natural exponential SIN – returns Sine as radians COS - returns Cosine as radians TAN - returns Tangent as radians ASIN – returns Arc-sine as radians ACOS - returns Arc-cosine as radians ATAN - returns Arc-tangent as radians Hope this helps

[psm2001 0]

thanks

[kevinkevin 0]

Is it possible to create a positive or negative edge in ST language ?

[innoaloe 59]

No... but you can emulate it using internal memory. CMIIW

IF Input = TRUE THEN
     IF EdgeDetect = FALSE THEN
          'Do "Something", anything you want do be done with the program
          EdgeDetect := TRUE;     'This will ensure the "Something" will be called only once
     END_IF;
ELSE
     EdgeDetect := FALSE;     'This will resets the edge detection
END_IF;

Edited 5 May 2018 by innoaloe

[BITS N BYTES 66]

More ideas. Trigger oneshot with differentiated instruction for EN input OR handle oneshot with internal latch within ST.

EdgeDetect_Example_1.cxp

Edited 5 May 2018 by BITS N BYTES
Better examples

[BITS N BYTES 66]

With INNOLALOE'S code on rungs 5 and 6. He's THE BEST!!

 

 

EdgeDetect_Example_2.cxp

[panic mode 246]

This can work in any language. Important thing here is that flag used to store information must be static...

[Crossbow 294]

R_TRIG and F_TRIG function blocks can be used in ST.  They are edge triggers in the Sysmac platform.  You didn't state what PLC.