After Mitsubishi TCP/IP communications declares a device "dead", it periodically tries to re-establish communications between poll checks. The default number of tries is 10.
To change the number of retries:
Add the following record to the log_names.cfg file:
<retries> is the number of retries to re-establish communications between poll checks.
Larger values will tend to increase the amount of time it takes to recognize that a device has recovered and re-establish the connection.
Smaller values will increase the overhead if there are a number of devices down.
Change timing and performance characteristics.