IAC Communication timeout
I am facing a problem with IAC communication between controllers , its keep on fluctuating alarm that IAC communication timeout and then works again good for some time and fail again as well .
I checked the settings in the IAC , the normal interval time for IAC is 2000 while the application interval time is 1000 which shall be okay and as well the interval timeout for IAC is 6000 .
In one of the controllers to solve this problem i extended the interval timeout to become 10000 which is too much but it works . So i am not sure what is the reason for that timeout and is it acceptable to increase the timeout as i believe there shall be another solution for that problem .
When does the timeout happen ? Are you downloading to a controller ?
IAC still uses MMS to communicate between controllers. Anything that would cause MMS to halt temporarily will also cause IAC to halt. And downloading to a controller is the most common cause of problems.
Otherwise you need to look at how many MMS messages are being sent between controllers and if there is any possibility of an overload.