![]() ![]() Ensure that the protocol is set for Modbus. This will identify it on the network from the other slaves. The node address of the Click PLC will be set to 2. 9600 baud, 8 data bits, even parity, and one-stop bit. Under the basic protocol, ensure that the communication parameters match the settings from last time. Alternatively, can also select COM Port under the Setup option on the main menu. This can be done by selecting Com Port3 Setup from the function table in the navigation window, or by selecting COM Port Setup… under the CPU icon on the main screen. In the Click, programming software calls up the COM Port Setup for Port 3 (RS485). ![]() In our case, the BRX Do-More will be the master, communicating to the Solo and Click PLC slaves. There is only one master (Client) to several slave (Server) units. It can also be referred to as a Client/Server. Modbus RTU is a master-slave type of protocol. (1:N) The protocol or information that we will be sent on this serial network is Modbus RTU. RS485 is a one-to-many type of serial communication. The termination as shown before is built into the BRX Do-More CPU. The wire is daisy-chained from device to device with termination on each end. This has a network wire length of 1200 meters without repeaters. Using the same hardware as last time we will now add a Click PLC with an RS485 serial port. This will be Modbus RTU (RS485) to a Solo Process Temperature Controller and Click PLC. Watch the video below to see the operation of the Modbus IO scanner profile on the BRX Do-More PLC. The programming software and manuals can be downloaded from the Automation Direct website free of charge. Report this adOur entire BRX Do-More series can be found here. Modbus RTU TCP Remote IO Controller BX-MBIOīRX Do-More PLC to Modbus Remote IO Controller BX-MBIO – VideoīRX Do-More PLC FTP Client Get Put – VideoīRX Do-More PLC High-Speed Input Counter – VideoīRX Do-More PLC High-Speed Input Timer – VideoīRX Do-More PLC High-Speed Input Pulse Catch – VideoīRX Do-More Simple Modbus Serial Communication – Video – Unboxing SIO MB12CDR and SIO MB04ADS VideoīRX Do-More PLC to Stride Field IO Modbus TCP – VideoīRX Do-More PLC Ethernet Remote IO Controller BX-DMIO Stride Field Remote IO Modules Modbus TCP Ethernet Serial Communication – Modbus RTU to Solo Process Temperature Controller – VideoĪdvancedHMI Communication – Modbus TCP – Videoĭo-More Simulator MQTT Publish / Subscribe – VideoīRX Do-More PLC MQTT Communications – Video Monitoring and Testing the Program – Video Previously in this BRX series PLC, we have discussed: ![]() Using the Modbus scanner to write and read instructions we will also show how to use the ladder logic code with our scanner. ![]() We will now use the Modbus profile in the Modbus IO Scanner to connect a Click Plus PLC to our RS485 network. This was all be done without using any ladder logic code. The writing of the set value (SV) located within the BRX Do-More controller was also done. (twisted pair) We manually set the Modbus IO scanner, reading the present value (PV) and set value (SV) of the Solo. Last time we communicated to a Solo process temperature controller via Modbus RTU RS485. Modbus communications are done independent of the PLC scan time and will have little or no ladder logic for the program. This will greatly reduce the time it takes to implement and troubleshoot communications in your projects. The Do-More Designer Programming Software (2.9) or higher includes a Modbus I/O Scanner with some profiles for Modbus Server (Slave) devices. ![]()
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