Documentation

Boolean input to allow the user to request a connection to the defined Modbus server. This input is deactivated if the Auto Connect checkbox is enabled.

Boolean output to inform the user when a connection with the defined Modbus server is established.

Apply the Client Station ID of the corresponding Setup block. Must range between 0 and 65535.

The Connection ID is used to assign Connection and Transceiver blocks to a particular client connection. Connection IDs range between 0 to 65535 and must be unique for each Client (Station ID).

Enter the IP address of the Modbus server to which you want to connect.

Enter the TCP Port of the Modbus server; the default port for Modbus is 502. The reserved ports should not be used. Refer to the following online documentation: List of TCP and UDP Port Numbers

The bytes of a register must be swapped if the sender and the receiver interpret the byte order in different ways (endianness). The Speedgoat real-time target machine uses little-endian, while some servers use big-endian. If the swap option is enabled, all register values from the application context will be swapped before they are sent to the network. All register values received from the network will be swapped before they are submitted to the application context. The swap option only affects input registers and holding registers (transmitted by function codes FC3, FC4, FC5, FC6, FC16). Discrete inputs and coils are not affected. Use Byte Reversal blocks instead of enabling the global byte swapping if only single registers need to be swapped.

If selected, the Transceiver blocks associated with the Connection block send Modbus request messages to the remote Modbus server device simultaneously. The transmission is never delayed and the Transceiver blocks do not impact each other.

If not selected, the Transceiver blocks send Modbus messages one after the other. A Transceiver may only send its request message after the previous Transceiver has received a response. This option allows the client to communicate with server devices which only process the first request message in the Ethernet input buffer and discard the remaining ones.

To facilitate the connection handling, the Auto Connect function tells the Connection block to establish a connection with the Modbus server as soon as possible. If the connection is closed, the Connection block will try to reopen a connection automatically.

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.