Hi,

We've got a DT82I running 24/7 at a remote site. The program is meant to retain some CV's to be used as reference for the next day.

But, I've noticed that my DT82I sometimes doesn't seem to retain those values. Upon checking, we found that the DT82I displays the "DT80 restarted / Power loss" message every morning. But we have it running on an UPS, so I doubt power supply is an issue. Upon going through the event log, this is what I found :

EVENT ,2014/08/24,04:03:07,0.576293,"No HTTP listener running: restarting"
EVENT ,2014/08/24,04:03:10,0.760375,"Reset 9.10.4890 PLL/WDOG/DEBUG (c860400d)"
EVENT ,2014/08/24,04:03:11,0.065307,"Beginning entry of job "CONFIG""
EVENT ,2014/08/24,04:03:17,0.986083,"Loaded job "CONFIG""
EVENT ,2014/08/24,04:03:20,0.892944,"HTTP Listener monitor started"
EVENT ,2014/08/25,00:49:40,0.702026,"No HTTP listener running: restarting"
EVENT ,2014/08/25,00:49:43,0.881103,"Reset 9.10.4890 PLL/WDOG/DEBUG (c860400d)"
EVENT ,2014/08/25,00:49:44,0.186157,"Beginning entry of job "CONFIG""
EVENT ,2014/08/25,00:49:50,0.998657,"Loaded job "CONFIG""
EVENT ,2014/08/25,00:49:54,0.013916,"HTTP Listener monitor started"
EVENT ,2014/08/25,22:27:36,0.801147,"No HTTP listener running: restarting"
EVENT ,2014/08/25,22:27:39,0.980712,"Reset 9.10.4890 PLL/WDOG/DEBUG (c860400d)"
EVENT ,2014/08/25,22:27:40,0.290283,"Beginning entry of job "CONFIG""
EVENT ,2014/08/25,22:27:47,0.032714,"Loaded job "CONFIG""
EVENT ,2014/08/25,22:27:50,0.130371,"HTTP Listener monitor started"

Could anyone explain what is the "No HTTP listener running:restarting" message mean? And how do I prevent it from occurring? Or is there a way for the CV values to be retained in the event of a power loss?

Thank you.

Hi Arivan,

That restart happen as part of watchdog function when the logger run out of connection socket. This event is caused by incomplete closing process of TCP IP connection.
You may disable watchdog function to prevent the logger from restarting, however it may prevent you from connecting to the logger if that event happens.
PROFILE HTTP_SERVER ENABLE_WDG=NO

For retaining channel variables, you need to enable it in DT profile setting.
PROFILE STARTUP MAINTAIN_VARS=YES

Best regards,
Rudy Gunawan

Hi Rudy,

Thank you very much for the clarification. I'll try to find what is causing the incomplete TCP/IP connection then.

Regards,
Arivan