tometrajkov
Member
Hello
I have project to connect Visio PLC with WinCC Scada via GPRS modem Enfora. I tried to connect them with modbus protocol via modem, but when the modbus became active, I can not establish connection to the PLC. First I use com init block for the serial port for the modem and I establish communication. But when the modbus is active for the same port, the port is blocked. Could somebody tell me how to make communication with modbus protocol via gprs, or tell me other way to read the values via gprs.
Thanks in advance
I have project to connect Visio PLC with WinCC Scada via GPRS modem Enfora. I tried to connect them with modbus protocol via modem, but when the modbus became active, I can not establish connection to the PLC. First I use com init block for the serial port for the modem and I establish communication. But when the modbus is active for the same port, the port is blocked. Could somebody tell me how to make communication with modbus protocol via gprs, or tell me other way to read the values via gprs.
Thanks in advance