Darius, can you tell what solution you have done with this topic problem?

I have almost the same situations (I guess) with S7-1200 and S7-300 stations, which are working with MD720-3 and Sianut Micro SC server. The ISP router some times makes tricks and port 26862 forwarding is not working for some time. The SCADA shows that PLC and GPRS connection is not active. When router is working OK again, then PLC and GPRS connection repair. BUT !!! Some times, there is no real connection for long period, like two days, and after that practiclly all modems are in starnge mode (i.e. S7-300 station modem shows only Q LED active) and GPRS connection does not repair by itself. Only modem power reset can help. I tried to find software solution, but I think modem reinitialization works only with CPU restart!?

Maybe somebody has experience? Now, it seems like only automatic solution for this problem is relay switch from CPU output for 24V modem power.

Thanks in advance

Step7_by_Step7

Maybe somebody has experience? Now, it seems like only automatic solution for this problem is relay switch from CPU output for 24V modem power.