Logix executing AOI sheets on sequential scans

[patjdixon]

It appears to me that Logix is improperly executing sheets of an AOI in sequential scans instead of the same scan as the main program. To test this, I created SheetTest.ACD

I have an AOI called SheetTest_AOI. It consists of 5 sheets of function chart logic. The only thing it does is pass a value from the first sheet to the last sheet. The main routine is running 1000 msec and calls the function block routine SheetTest, which only has the SheetTest_AOI in it. Unfortunately I cannot upload the code, so I attached bitmaps.

I created the FT ME version of an HMI to see the result. When I change the input on sheet 1, I see the value I pass update on each of the sequential sheets in the AOI one scan later as you can see from the attached image.

Is this a Rockwell bug, or is there something that needs to be done in sheets or AOIs to make the value pass all the way through in one scan time?

 

[drbitboy]

It looks to me like it is behaving as advertised.


Try using connectors instead of references to control the order of execution, and see if the behavior changes.

• https://literature.rockwellautomati...{"num":3543,"gen":0},{"name":"XYZ"},52,678,0]
• https://literature.rockwellautomati...{"num":3555,"gen":0},{"name":"XYZ"},52,405,0]

 

[patjdixon]

As advertised? I have not found anything in Rockwell literature that states each sheet will execute on its own scan.

 

[patjdixon]

Now I see. It is the IREF that latches. I will try connectors.

Thank you for the response

 

[patjdixon]

Connectors fixed it