Seeing different values on 2 different Panelviews running same application

[wesselvos]

Hi!

Small question. I have a customer currently that is reporting an issue of 2 different panelviews running the same application connecting to the same PLC showing 2 different colors on the same valve. I normally use grey as closed and green as open for my applications. On one panel the valve shows grey and the other shows green. As you understand this makes it very confusing for an operator. I use normal shapes like polygons and circles with animations for the different colors to indicate the status of a valve.

The problem seems to occur when one of the panels is rebooted and the other is not. Have any of you seen this before and perhaps have a solution?

Thank you!

 

[Ken Roach]

Does the difference only show up after the reboot, and resolve itself within a few seconds ?

Ideally, the application will allow you to view the FactoryTalk Diagnostics and see if there are any communication errors between either of the HMIs and the controller.

While it's theoretically possible that FactoryTalk Linx or FactoryTalk View is actually mis-reading a tag, it is more likely that the applications are not actually identical, or there is a communication problem to the CPU.

 

[James Mcquade]

i would check the default settings on the buttons.
1. the state colors are backwards.
2. the default display setting on power up (not exactly the right wording) is set to an initial state.
james

 

[Frost999]

i would check the default settings on the buttons.
1. the state colors are backwards.
2. the default display setting on power up (not exactly the right wording) is set to an initial state.
james

My guess is it's a maintained PB and option 2 above is also involved.

I tend to make the (PLC) logic toggle PB states and the PB's indicator just reflects the state-tag instead of actually writing it. You will practically never have to worry about seeing weird state issues when you go this route, vs having a PV maintain a state through a PB type.

 

[jstolaruk]

What model ethernet switch are you using?

 

[GaryS]

It should be clear the if you showing 2 different values read in from the same plc and tag
then it can not be the same program
it may be reading a different tag, a different plc or the programs are not the same
you ned to check everything carefully
or actually copy the program from one to the other

 

[geniusintraining]

Is there a read/write tag? maybe its only being told to look at and update every so often so one is being updated while the other is not.

What happens if you reboot both HMI's, are they both the same then?