detecting actual and previous screen

[stream]

hi,

 

I would like to detect ( in the ladder)  which screen is on at the moment and which screen launched it. I have build rungs for each screen but with many screens is is tedius.

In help I cannot find anything and I can't find a system tag on it. In other companies hmi I used to find system tags keping track of it. To me It can be very helpful knowing where the

"operator" is in deciding the flow through the program (ladder).

[Alexander]

Within UniLogic each screen has an optional tag link for a property if screen is active. This can be found within the main properties window for each individual screen. This tag can be assigned and used in conjunction with set/reset bits when a screen jump is being performed.

[stream]

Thanks Uniguru for your reply.

 

I found it and it works. But is there also a tag telling which screen launched the momentary screen?

[Alexander]

There isn't a direct tag that indicates which screen was selected previously, but you could also implement logic that each time a screen jump is performed a bit tag is set indicating which screen was just implemented.

 

For example:

 

On Display 1, I press a button that performs 2 actions. The first action is to jump to screen 2, the second action is to set a bit tag with the description "Screen Jump from Display 1 Performed". This bit tag can then be used as necessary to indicate that a jump was performed from display 1. It can then be reset as necessary within the logic.

[stream]

Thanks for your advise and help Alexander.

[mzalbadri]

I have a related question.

 

I am looking to load screen (that will show up within short period of time) if a bit is set to one. How can I do that? I would appreciate any help or reply.

[Flex727]

Use a TON timer to trigger setting a bit. Then use that bit as an Action to load the screen you want.

[mzalbadri]

Thank you for your help. I had no problem with the timer part but I did not know about Actions. Nice feature.