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Please check that application/program scan time is less than the IAC normal interval time
so please make the IAC scan time more than your application/program interval time.
I am facing same problem as well and i configured interval time for IAC to be 2000ms will the application is configured to be 1000ms and configured the timeout to be 6000ms but after some time the IAC will report communication down and the communication could work fine if the timeout is extend to be 10000ms , Is there a problem in the IAC timeout and to extend it to 10000ms is acceptable ?
Generally depends on the controller load,network load & IAC you can use 10000ms as well if you are using those variables for monitoring purpose.