Structured text Programming

2020-02-27T13:48:27.258000Z

Dear Ricardo,

Since you are new to ST, you may find some of the videos below useful:
http://www.youtube.com/user/talizadeh?s ... irmation=1

Regards,
Tohid

Structured text Programming

2020-02-27T13:48:27.194000Z

Hi ricardorbinar.

ricardorbinar hat geschrieben:
Hi, Im new in Structured Text Programming, and Im looking for a JUMP command. What is the code for jump in ST?

Look for JMP in the CODESYS online help. Be careful not to build an endless loop!

BR
Martin

Structured text Programming

2020-02-27T13:48:26.900000Z

Originally created by: scott_cunningham

JUMP is not directly supported in ST. You have RETURN available like in LD, but you have to use IF statements or other techniques. Note that the just released programming guidelines from the PLCopen group recommend not using JUMPs and RETURNS for debugging reasons. I agree and suggest to avoid JUMPS. There are times I like to use returns (at the beginning of a POU - IF NOT Enabled THEN RETURN).

Structured text Programming

2020-02-27T13:48:26.823000Z

ricardorbinar hat geschrieben:
Hi, Im new in Structured Text Programming, and Im looking for a JUMP command. What is the code for jump in ST?

IF NOT(Jump Condition) THEN
END_IF


This is not how I typically program. I tend to implement SFC type code using a state variable and a CASE statement. 
PJE

Sent from my SM-G900V using Tapatalk

Structured text Programming

2020-02-27T13:48:26.704000Z

ricardorbinar,

All machine programing is based on states. The easiest way to create a state machine in ST is using a case statement. Please understand the example below is only an example to show how you can expand on the idea. The example does not jump states but that is easy to do by changing the step to a different number.

VAR
   Step:   INT;
   Delay:   TON;
   Enable:   BOOL;
   OUTPUT:   BOOL;
END_VAR
CASE Step OF
0:   (* Wait / Disable*)
   IF Enable THEN
      Step:=10;
   END_IF
10:     (* TURN ON OUTPUT DELAY 10s)
   OUTPUT:=TRUE;
   Delay(IN:=TRUE, PT:=T#10s);
   IF Delay.Q THEN
      Delay(IN:=FALSE, PT:=T#10s);
      Step:=20;
   END_IF
20:     (* TURN OFF OUTPUT DELAY 10s)
   OUTPUT:=FALSE;
   Delay(IN:=TRUE, PT:=T#10s);
   IF Delay.Q THEN
      Delay(IN:=FALSE, PT:=T#10s);
      Step:=0;
   END_IF   
END_CASE

Structured text Programming

2020-02-27T13:48:26.633000Z

I don't know if there is a jump and if there is I don't think I would ever use it.

Within a single POU the way to conditionally run code is to put it into a IF/END_IF block.
If you want to call another POU as a subroutine then you put the name followed by parenthesis:
OTHERPOU( parameters);

PLCs work best when there is a clear line of code execution and Jumps disrupt that.

Structured text Programming

2020-02-27T13:48:26.558000Z

Hi, Im new in Structured Text Programming, and Im looking for a JUMP command. What is the code for jump in ST?

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