Ladder Editor Bug

2020-02-27T14:00:16.967000Z

Just making edits with the ladder editor, saving and opening the project. Ladder POUs that won't open can be opened by either copying them or cut/paste them back into the project. But after a number of iterations the project sometimes gets corrupted.

Ladder Editor Bug

2020-02-27T14:00:16.724000Z

Hi Rick,

your CorruptedProject.project ist just a file with nothing but 151 649 zeroes.
How did that happen?

Regards
Roman

Ladder Editor Bug

2020-02-27T14:00:16.452000Z

I am writing another article, "Four Ladder Rungs - How something so simple can be so useful?" which I hope to publish in Control Engineering magazine. The idea is to show a simple state machine technique that can be used on virtually any PLC platform. Included in the article is a download of the example project and a link to one of you OEM customers website where readers may obtain the IDE.

I have encountered problems with the LD editor not being able to open POUs with a string of compare functions like the following:

I can enter, compile and run the code just fine as shown below. But when I close the project and open it again the POU containing this code will not open. If a copy of the POU is made the copy will open and a momentary message is displayed complaining about not being able to represent something or other. It doesn't stay up log enough to make a screen grab or to read it fully. The copy will not open the next time the project is opened either.

I could of course work around this by adding more rungs but that pretty much destroys the premise of the article. I really would like to showcase codesys and your oem customer's IDE in the article so any advice or information about this bug would be greatly appreciated. I have attached a project that contains the above offending code.

I should also note that this bug had managed to completely hose an entire project. It's something people who do a lot of ladder would be upset about.

Thanks for your attention
Rick

[edit]
I have since recreated the corrupted project which is also attached. When opening the project I get the following message box:

[edit]
And here another project (PlcStateMachinePrograming-0004) using GE,LE, NE with an AND block (FB MSMLD128) where POU does not open. MSMLD64 also does not open.

I am using Bedrock 1.3a IDE

CorruptedProject.project [148.09 KiB]

PlcStateMachineProgramming 0004.project [137.47 KiB]

CodesysLadderBug.project [119.42 KiB]

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