[Debugging the code step by step]

On 5/1/2020 at 12:54 AM, Ausman said:

Initially I'd actually log every single parameter change to a data table with a matching time.  Or log all  variable parameters to a data table every operation start.  It all depends on how many variables change during the full operation.  

If the data tables are going to fill quickly, they can be shifted onto an SD for later viewing.

This method would at least give you a starting point, by imitating those variables to see if you can consistently reproduce the error.

cheers, Aus

Thank you for that suggestion. 
I'd like to make a check if there's a change to any of my bits, and if there is a change in any I'd put them all in a table with addition of cycle counter and some program timers and counters.

How would that influence cycle time? I would idealy clear the table every cycle, write to it, for every single change, so probably few thousand rows, and if the timer gets too long I know there's an error, I'd copy it to the SD card so I can access it later.

I saw a command to add a row to datatable in SD card, but for the tables in memory I have to specify which row? Am I missing something or do I have to make my own counter?

I'd love to test that on my own but I have access only to a PLC that's in production, and this is solving a minor problem so not critical enough to let me access to just play with it. I'll of course try it all, just would like to know if it's even possible/reasonable the way I want it before I mess something up

[Debugging the code step by step]

Hello everyone.

I've been given a code by a person who left the company with a bug that never got solved. The PLC works about 800-900 operations a day, and 1-2 times it will stop in the middle. Is there a way to make a log that I can look at cycle by cycle?  Or step by changes in states, I don't need to see every single one, but I could solve that myself if I could get the data.  I saw DataXport as an option but it has resolution of 1min, and my full operation lasts 20sec.

As the PLC is on a machine in production I can't play with it to test solutions, so what I need is a way to find a problem without interfeering.

PLC is V700 if it makes a difference