How to clear cache values after connection loss

How to clear cache values after connection loss

Hi Guys
I have a Scenario where I am facing trouble
I have many Relays and calculating the Total Current by adding all the current values of the relay. If suddenly the communication of one relay is lost then the value (that was updated before communication loss) remains the same with a Red Dot at the top corner.
My problem is
1.The cached values are getting used by the mathematical value and Zenon logic resulting in Wrong Calculations. So How to make the value to 0 or unusable once the communication is lost.
2.The Red Dot are Awkward to see. How to Remove that Red and Blue Dot at the top corner.
Please Share some Ideas.

This is a migrated post! Originally posted on 02.08.2017 by user Praveen Kumar Karthikeyan. Please be aware that information can be outdated.