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  1. Hello everyone. I'm new to  Mitsubishi PLC . My device is  Mitsubishi PLC  Q Series(Q03UDV) and GX worker2 to set up parameters. I'm now implementing an application to communicate PLC with MC protocol. After some research, the application can now read or write data to PLC. But here's the problem, I have found that once an application is connected to PLC and read/write data(without closing the connection), other application must wait until the first application close the connection to read or write data. I have read these manual, but no solution has found. Hope someone knows the reason, thanks. http://forums.mrplc.com/index.php?/files/file/1086-q_l-melsec-comms-mc-sh080008lpdf/ http://dl.mitsubishielectric.com/dl/fa/document/manual/plc/sh080779eng/sh080779engai.pdf