ModbusTCP communication of Mitsubishi Q series PLC

BCNet-Q is a new Ethernet communication processor designed to meet the increasing demand for plant equipment informatization (equipment network monitoring and production management) for Ethernet data acquisition from Mitsubishi Q0x/Q0xU/Q0xUD series PLCs, BCNet-Q supports most SCADA software in the industrial control field, and supports both Mitsubishi Ethernet protocol and BCNet-Q supports most SCADA software in the industrial control field and supports both Mitsubishi Ethernet protocol and ModbusTCP communication methods.

ModbusTCP Communication Description

The BCNet-Q module has an internal ModbusTCP communication server, so ModbusTCP clients, such as ModbusTCP-enabled configuration software, OPC servers, PLCs, and software developed in high-level languages to implement ModbusTCP clients, can directly access the internal data area of Mitsubishi Q series PLCs, and the Modbus protocol address BCNet internal has been mapped to the Q series PLC address area by default, the realization of the function number include: FC1, FC2, FC3, FC5, FC6, FC15 and FC16.

Host Computer Communication Configuration

(take Siemens configuration software WINCC as an example)

Open Wincc software, create a new project, right-click “Variable Management”, select “Add New Driver Connection”, select “Modbus TCPIP.chn” in the pop-up dialog box. “, click “OK”.

Right-click “Modbus TCPIP/IP Unit #1” and select “New Driver Connection”, create a new name, click “Properties”, the pop-up properties dialog box will appear. dialog box, select “984” for “CPU Type”, fill in the IP address of BCNet-FX in “Server”, and click OK.

Right-click “Variable Name” and create a new variable, here we create a new D0 variable, and click “Select” for the corresponding address setting, a pop-up dialog box will appear, select “Area” and “4x Holding Register”. Please click “Select” to bring up the dialog box, select “4x Holding Register”, and fill in “402001” in “4x”, note: the address of D0 is 42001 according to ModbusTCP address correspondence. Since the number of address bits in wincc is 6, so 42001 corresponds to 402001 in wincc.

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