When Mitsubishi TCP/IP communications writes an asynchronous request via a socket to the PLC and the request remains outstanding for more than 120 seconds, the device is declared dead.
To change the time-out:
For all devices on a given port:
Add the following record to the log_names.cfg file for all devices on a given port:
For all devices in a selected project:
Add the following record to the log_names.cfg file
<seconds> is the number of seconds to wait before declaring the device dead.
You can disable this feature by using -1 for <seconds>.
Important: The port defined logical has precedence over the project-wide logical.
Change timing and performance characteristics.