Design of Serial Communication Based on VB and Mitsubishi Protocol

PC-GOT-PLC is a popular automatic control system. Applied F940GOT and FX2N series PLC to system, without any mitsubishi's special communication board and under a very simple connecting mode, realized their mutual communication; System achieved the efficient, stable and reliable communication under simple attachment without any mitsubishi's special communication board. The communication applied mitsubishi FX series PLC programming interface protocol, no longer need to set up the D8120, simplified the PLC program; Under this protocol and based on VB6.0 development environment,write the serial communication program adapt to FX full series,the program make the PC can read/write the PLC soft equipment and forced ON/OFF directly. In the actual application, No matter accuracy and stability of communication were to achieve requirements of industrial control system.