Programming in ST (Structured Text)

Dariusch

Member
D
Join Date
Sep 2003
Posts
284
Hi all,

I am trying to the GX IEC Developer and are trying the ST programming mode.

But how do you make a Pulse --|P|-- ??

Does any of you have any experience in the ST programming (good or bad)?


Thank you

Dariusch
 
A pulse is not a standard statement for ST. I don't know the GX IEC Developper.
What I do in ST compare the new state of the input with the previous state of the input.

Henry
 
But how do you make a Pulse --|P|-- ??

Example positive puls:
PROGRAM PLC_PRG
VAR
In: BOOL;
Inold: BOOL;
ut: BOOL;
END_VAR
IF In = Inold THEN
ut:=FALSE;
ELSE
IF In THEN
ut:=TRUE;
END_IF
END_IF
Inold:=In;
I think ST programming is the best

Olle.T
 
Hi,

I don't know GX... but this should
work on most PLC:


A input

AN bit xy

= pulse

 

A input

= bit xy



cheers
Rolf
 
This is a better example:

PROGRAM PLC_PRG
VAR
in:BOOL;
out:BOOL;
inold: BOOL;
END_VAR

out:=in AND NOT inold;
inold:=in;

Olle.T
 
Thank you all for the response.

Now Iam so fare:

Test_TRIG(_CLK:=Start); (*Call the FB R_TRIG*)

IF X3 AND ??? THEN;
D12:= D12+1;
END_IF

But where is the output from the oneshot???
The Test_TRIG is the FB "R_TRIG" (IEC) and the variable for execute the FB is "Start" (_CLK) , but where is the (Q) output??
Dariusch
 
Dariusch,
I had to find out "the hard way" too about 5 years ago, not Mitsubishi, but Beckhoff, no documentation.....
 

Similar Topics

S
TwinCat Structured Text programming
Hello everyone: I have been able to read and write data via canopen interface through ADS read and write functional blocks in Twincat PLC...
Replies
9
Views
4,265
Sohaib28
S
N
structured text programming
hi, i think this is my first time to use structure text program in OMRON. i use it for make fuzzy logic to control voltage induction generator...
2
Replies
18
Views
5,758
shooter
S
A
Structured Text Programming
Good day to all, I'm a proficient PLC Programmer in the Ladder format. Just recently I'm studying the Structured Text Programming and it's nature...
Replies
12
Views
20,796
osmanmom
O
S
Which programming method is better - ladder logic or structured text
This question is addressed to those who have ample experience with both LL and ST. I know only ladder logic. I find that many a time it takes...
2 3
Replies
32
Views
26,936
Paullys50
P
M
Structured Text Programming
Hi, I have been working with PLC systems for the past five years, up to now all of my programs have been written in ladder logic. Now I have...
Replies
3
Views
6,410
Martin IRL
M
Back
Top Bottom