To communicate a Mitsubishi PLC with an HMI, you first need to establish the correct physical connection and then configure both devices in the software. Start by identifying the communication type supported by your PLC and HMI—commonly Ethernet, RS-232, or RS-485. If you’re using an Ethernet connection, connect both the Mitsubishi PLC and the HMI to the same network through a switch or direct cable. Assign compatible IP addresses and subnet masks to ensure both devices can recognize each other. For serial communication (RS-232 or RS-485), use the proper communication cable and set matching baud rate, parity, and stop bit parameters. Once the physical connection is done, open the programming software—GX Works2 or GX Works3 for the PLC—and create or open the PLC project. Confirm that the communication parameters like port number, transmission speed, and protocol (such as Mitsubishi MC Protocol) are correctly configured.
Next, open the HMI software—such as GT Designer3—and create a new project. Select the exact model of both the Mitsubishi HMI and PLC, then choose the same communication interface you configured in the PLC. Inside the HMI project, define and map the tags or device addresses (like D100, M0, or X0) to match those used in the PLC program. This allows the HMI to read and write data from the PLC memory directly. After configuration, download the respective programs to both devices and perform a connection test. You can verify communication by running a simulation or monitoring real-time data on the HMI screen. If the HMI displays live input/output status, it means communication is successful. In short, to communicate a Mitsubishi PLC with an HMI, ensure proper cabling, correct IP or serial settings, and matching tag configuration within GX Works and GT Designer software for smooth and reliable data exchange.