Creating Modbus Slave I/O Servers
August 2006
NI Part Number:
370246E-01
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Note By default, the LabVIEW DSC Module does not install Modbus support. You must click Modbus Protocol Support in the Features page of the DSC Module installer and select Install this feature to a local drive. You also can launch the Windows Add or Remove Programs window and click the Change button for National Instruments Software to modify the installation. Click the Modify button in the National Instruments Software dialog box and select Install this feature to a local drive for the Modbus Protocol Support feature. |
Modbus is an application-level messaging protocol that provides client-server communication between devices connected on different types of buses or networks. With the DSC Module, you can use National Instruments controllers as Modbus slave devices. You then can bind data items in the simulated Modbus slave devices to network-published shared variables to read or write the data from VIs or Modbus master devices.
Right-click My Computer or a LabVIEW project library in the Project Explorer window and select New»I/O Server to display the Create New I/O Server dialog box. You then can select ModbusSlave and click the Continue button to display the Configure Modbus Slave Instance dialog box.
You also can use the Create and Configure IO Server Express VI to create a Modbus Slave I/O server programmatically.