Documentation

Select the type of the serial interface you want to use for Modbus communication. The list consists of supported serial I/O modules.

Enter the Module ID of the related serial module's Setup block.

Enter the channel number of the serial I/O module to which you want to assign the Modbus RTU server nodes.

The Server Setup block defines one Modbus RTU server interface bound to a specific serial channel. The interface ID is used to assign Setup, Read and Write blocks to that interface. Interface IDs range between 0 to 65535 and must be unique along all Modbus RTU Client and Server setup blocks in a model. You can define multiple server interfaces by placing a Setup block in your model with a unique interface ID for each interface. One server interface can manage multiple server nodes.

The automatic interface ID checkbox enables the automatic generation of a unique interface ID, based on the above physical layer selection.

Defines the Node IDs the server interface should manage in the range of 1 to 247. Each node has its own data tables for coils, discrete inputs, holding registers and input registers. Modbus clients can address a certain node with the node identifier in the Modbus request frame.

According to the Modbus standard, Node ID 255 means NON-SIGNIFICANT. If the node identifier received is 255 but Node 255 is not configured in the server, the requested command is performed on the first node specified in the nodes parameter.

Default: [1] creates one node with ID 1. Modbus requests with node identifier 1 or 255 are passed to Node 1.

Example: [1,247] creates two nodes with ID 1 and 247. Modbus requests with node identifier 1 are passed to Node 1. Modbus requests with node identifier 247 are passed to Node 247.

Example: [1,2,3,247] creates four nodes with ID 1, 2, 3 and 247. Modbus requests with node identifier 1 are passed to Node 1. Modbus requests with node identifier 2 are passed to Node 2. Modbus requests with node identifier 255 are passed to Node 1.

Defines the number of coils, discrete inputs, holding registers and input registers of each Modbus node. The value must be an n-by-4 matrix, where n is the number of Modbus nodes. One row represents one node, the four columns represent the four Modbus data tables. The number of items per data table must range between 1 and 65535.

Example: [1,2,3,4;5,6,7,8] The first node has 1 coil, 2 discrete inputs, 3 holding registers and 4 input registers. The second node has 5 coils, 6 discrete inputs, 7 holding registers and 8 input registers.

Defines the number of milliseconds the server should delay a Modbus response after having received a request. The number must range between 0 (no delay) and 60000.

Defines the base sample time at which this driver block gets its sample hit. This parameter can also be set to -1 for inherited sample time. The units are in seconds.