How to enter both boxes and jumps inline in an LD?

2020-02-27T23:12:41.825000Z

if statement is possible with the enable input.

and in ladder off course.

How to enter both boxes and jumps inline in an LD?

2020-02-27T23:12:40.202000Z

Hi shooter,

thanks for your answer!

when converting it looks fine but does not work, it will not jump.

At least in simulation mode, it works for me. I don't have any hardware, so I cannot test.

make your own EQ block like BLEQ

Lacking any answer from 3S, this may well be the way to go.

jumps are bad practice in ladder.

I totally agree - jumps are bad practice anywhere. I only allow certain arrangements of jumps to emulate an "IF" as available in Structured Text.

-Oliver

How to enter both boxes and jumps inline in an LD?

2020-02-27T23:12:35.682000Z

you are correct in observation, however when converting it looks fine but does not work, it will not jump.

there is a work around

make your own EQ block like BLEQ as a pou (functionblock)

make sure the output is bool and this you can insert into ladder

test it with a coil parrallel.

however i still think jumps are bad practice in ladder.

yes i know siemens and others are full with them.

How to enter both boxes and jumps inline in an LD?

2020-02-27T23:12:33.989000Z

I use CoDeSys 2.3.9. When I enter a conditional jump in the FBD editor like this:

     +----+
     | EQ |
in---|    |--->>label
 0---|    |
     +----+

```and then let CoDeSys transform the POU from FBD to LD, I get this:

| +----+
| | EQ |
+--- (empty rung) ------|EN |
| in---| |--->>label
| 0---| |
| +----+

```which looks perfect to me.
I just cannot seem to enter the same in the LD editor manually:
- When I start with the box and want to add a jump at the box's output, the menu entries for jumps are greyed out.
- When I start with the jump, adding a box to the jump puts the box in parallel to the jump, not in front of/as the input to the jump, like this:

|---  (empty rung)  -+--->> label
|                    |    
|                    |    +----+
|                    |    | EQ |
|                    +----|EN  |
|                    in---|    |---
|                     0---|    |
|                         +----+

(Of course, I can assign the output of the box to a temporary and then jump on that temporary in the next network, but I need it to be in one network only.) Who can help?

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Recent posts to How to enter both boxes and jumps inline in an LD?

How to enter both boxes and jumps inline in an LD?

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How to enter both boxes and jumps inline in an LD?