Description
The CODESYS Modbus Client (RTU/ASCII) configurator, which is integrated in the CODESYS Development System, expects a license on the device. This license is either already stored in the controller by the device manufacturer 1 or added afterwards by the end user 1. The product is also available for Modbus TCP. Processing requires a protocol stack and CODESYS I/O driver that implements Modbus communication on the configured COM port. This I/O driver is supplied with the license as CODESYS libraries. If a license for the CODESYS Modbus Client (RTU/ASCII) configurator is available on the device to be programmed, then the device can communicate with connected adapters and read and write their inputs and outputs, respectively. For this purpose, the communication parameters are predefined in the configurator, for example the settings of the serial ports (baud rate, port number). Modbus commands are defined in the configurator and are oriented to a specific Modbus server. The commands are processed by the device at specific intervals, or triggered programmatically. For predefined commands, I/O channels are generated automatically with variables that can be mapped (I/O mapping).
