I have a client that has many Automation Direct DL06 PLCs for a municipal water/wastewater system. When there is a power outage, one of the sites loses its Communication Port 2 settings and resets back to default. I then have to tunnel into the PLC and reset the settings. We have found that if there is a power outage when the PLC is controlling the pumps and actively pushing water, the comms reset to default. If the site has a power outage when the pumps are not pushing water, the comms will stay configured and they just have to reset alarms like normal. We have tried replacing the whole PLC unit (rack, CPU, expansion modules) and this issue is still presenting itself. I am not sure why this is happening and why it is only happening at this site. My company programs and maintains many DirectLogic systems and this is the only site with this issue.