This only happens when more than one unit ID is specified in the address mapping otherwise the unit ID is eliminated.
Now when browsing the Modbus device, the unit ID will show as a folder and the OPC Tag path includes the unit ID as shown below. The unit ID is specified for each entry in the address mapping for the Modbus device. Notice in the example below, the Prefix, Start, End, Modbus Type and Modbus Address can be the same for two entries provided that the Unit IDs are different. Only add one Modbus device to the Ignition OPC-UA Server device list for Gateway and specify the different unit IDs in the address mapping. Thus, when attempting to start a mapping at the 100th Holding Register, the value on this property would be 100 (assuming one-based addressing), not 40100 the Modbus Type property determines what the leading number is.
Since the Modbus Type property denotes which table the address will run against, the value here does not need to start with the entity number. The address in the device that mapping will begin at. The table each mapped address should run against, as well as the type and size of each address. A value of 0 means the first device, and should be used when only a single Modbus device is connected. See Address Mapping Multiple Devices for more details. When several Modbus devices are connected to a single IP address, the step determines which device the mapping should be applied against. Common values are 10 (decimal system) or 16 (hexadecimal). Determines what format addresses in the device are incremented and labeled (HR0, HR1.HR9, HR10, HR11). The base number of unique digits for modbus addresses. Please see the Floating Point or 32-bit Address Mapping for more details. This is commonly used to combine two words (16-bit addresses) into a double word (32-bit addresses). When enabled, adjacent addresses will be combined. The difference between these two values determines how many mapped addresses will be created. These properties determine the range of the numerical assignments. Numerical values will be assigned to each mapped addresses. The following values are reserved, and may not be used: HR, IR, C, or DI Must compose of letters, numbers, and underscore characters. A prefix applied to each mapped address as they appear in the OPC browser.
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