Where a third-party server uses the Modbus protocol to obtain data from ClearSCADA, and ClearSCADA uses the Modbus protocol to obtain its data from a PLC, ClearSCADA becomes dual-purpose, with regard to Modbus functionality. When communicating with the third-party server, ClearSCADA acts as a Modbus Slave, and when communicating with the PLC, ClearSCADA acts as a Modbus Master.
In this scenario, you need to configure both a Modbus Master, and a Modbus Slave configuration suite. You also need to check that ClearSCADA is running both the Simple Modbus driver and the Modbus Slave driver.
To configure ClearSCADA so that it can communicate as a Master, see Configuring Modbus Devices in ClearSCADA.
To configure ClearSCADA so that it can communicate as a Slave, see the ClearSCADA Guide to the Modbus Slave Driver.
