It has been put together by a PhD student Thiago Rodrigues Alves and according to his website consists of three parts: Runtime, Editor, and HMI builder.
FREE MODBUS SERVER SOFTWARE
Open PLC is an open source PLC software suite that has been built to function on an industrial and home automation level. Other T-series software options include the free LabJack applications and libraries. This section has a dynamic map that allows you to filter and search. The Modbus Map defines the address and name of all registers, along with other information. This will help in trying to debug any configuration issues with addressing or bit-wise (byte-flipping) and proves that communication has been successfully set up before trying to read data from other registers. The T7 and T4 have five test registers that should be used before trying to read/write to other registers. Additional support for any particular 3rd-party Modbus client can be found in forums for the Modbus client. The number of applications that exist is fairly large so we have not tested all of them. The following is a long list of client applications that we have found that claim to support Modbus TCP communication.
LabJacks with Modbus support follow the standard, so any Modbus TCP Client should be able to talk to our devices. Because of this they are compatible with dozens of 3rd-party Modbus client applications. LabJack T-Series devices are Modbus TCP Server devices.
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