4/12/2023 0 Comments Setting up modbus server![]() Number of Modbus registers that will be read during the request. The codes represent these functions:įirst Modbus register from which data will be read. Used for easier management purposes.Ĩbit INT | 8bit UINT | 16bit INT, high byte first | 16bit INT, low byte first | 16bit UINT, high byte first | 16bit UINT, low byte first | 32bit float, Byte order 1,2,3,4 | 32bit float, Byte order 4,3,2,1 | 32bit float, Byte order 2,1,4,3 | 32bit float, Byte order 3,4,1,2 default: 16bit INT, high byte firstġ | 2 | 3 | 4 | 5 | 6 | 15 | 16 default: 3Ī function code specifies the type of register being addressed by a Modbus request. Here is how our request should look like for this purpose: Let's say that in our case we are interested in the System Uptime parameter which is located in the first 2 registers of our device (more about the parameters and their registers we can get or set using Modbus service: RUT955 Modbus). We click ' Edit' button in the slave device's configuration.īy clicking the ' Add' button in the Requests configuration section we will be able to configure a new request. You can create a maximum of 64 request configurations for each slave device. The slave then sends the requested data back to the Modbus master. The master sends a request to a slave specifying the function code to be performed. A Modbus request is a way of obtaining data from Modbus slaves. Now the slave device is added to the Modbus TCP Master section but we need to test if it is working.įor testing if the functionality is working we can configure a request. Interval at which requests are sent to the slave device.Įnable this slave's configuration by clicking on the checkbox and enter the timeout in seconds. When set to 0, the slave will respond to requests addressed to any ID. ![]() When the master requests data from a slave, the first byte it sends is the Slave ID. Each slave in a network is assigned a unique identifier ranging from 1 to 255. Slave device's name, used for easier management purposes. Turns communication with the slave device on or off. Note: Slave's ID, IP and Port should be exactly the same as configured in the slave's device Services->Modbus pageĪfter clicking the 'Add' button you will be redirected to advanced slave's configuration page: To add a new slave, enter a custom name, slave's ID, IP address and port and click the "Add" button: On master device (in this example master device has 192.168.1.1 internal IP address) open Services->Modbus->Modbus TCP Master. This is done in Services->Modbus page:Ĭonfiguring Modbus TCP master device Adding new slave device Now we need to enable Modbus service for this slave device as we will open specific port for letting through TCP communications (it is also possible to 'Allow remote access' if we wish to access this router from external WAN using it's public IP). This can be done by changing the IP address parameter in Network->LAN page: In this example we would be configuring our slave device to have 192.168.1.2 internal IP address. an input value of 3.14 with 100 as scale is sent as 314, then it can be divided by the same scale to obtain the real value of 3.14).Īddress offset and number of Digital Inputs to use (max 256).Īddress offset and number of Digital Outputs to use (max 256).Īddress offset and number of Register Inputs to use (max 64).Īddress offset and number of Register Outputs to use (max 64).Firstly, let's configure our second router which will be acting as a slave device. Using this approach, a floating sensor's value can be converted into an integer, sent to the client and converted back to a real number by dividing it by the scale factor (e.g. Where to write analog sensor values (Input Registers or Holding Registers).įrom where to read analog actuator values (Holding Registers or Input Registers).įloating sensor values are multiplied by this value actuator values are divided by it. ![]() Where to write digital sensor values (Inputs or Coils).įrom where to read digital actuator values (Coils or Inputs). Periodically tries to connect to the PLC until a successful connection is established. This driver implements a Modbus TCP/IP Server (slave). ![]()
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