Ricardo R

Hello, I would like to know if someone uses other PLC with Modbus TCP/IP messages over GPRS VPN with a good result. Thanks, Ricardo R

Hello, I have a problen with SCHNEIDER PREMIUM TSX P57 2634M to connect to remote slave devices via Modbus GPRS. In this project, we have to communicate witch remote stations MOTOROLA MOSCAD, via GPRS Modbus TCP/IP. Actually there are 9 remote stations. We program MOTOROLA Moscad to work as Modbus RS-232 Slaves. Then we install VIOLA GPRS Routers and VIOLA M2M in control centre to manage VODAFONE dynamic IP remote addresses. To control GPRS traffic we use PREMIUM READ_VAR and WRITE_VAR functions, the TIMEOUT is set to 5 seconds. Every minute (its depends on the CICLO_LECTURA value), PREMIUM communicate with active remote stations (it depends on ESTACION_X_COM_ACTIVADA is set or not). If I reset PREMIUM, all active stations communicate OK, but if one station fails, in next communication PREMIUM open a new port to communicate with this station. One or two days after, one or more station stop communicate OK, the messages reported as 16#12FF, but if I communicate with ModbusPoll, remote station its OK, then if I reset PREMIUM, all stations can communicate OK, and in SNMP window, pots opened are set to "0". I hope you understand my English. Do you know the solution of this problem? Thank you very much, Ricardo R