The present invention relates to a method, device, and system for transmitting a program and parameter to a PLC. An adapter connecting to a port of a PLC allows an operator to simply (i) log in on a cloud server with use of a mobile terminal on which an APP is installed, (ii) download a written program or parameter, and (iii) transmit the program or parameter directly to the adapter wirelessly to transmit the program or parameter to the PLC via the adapter. An alternative embodiment may be arranged such that the cloud server transmits, to an APP of the mobile terminal over a mobile network, an instruction on what data to sample and that the APP accesses the PLC via the adapter, obtains the data, and feeds back the data to the cloud server. This simplifies the operation for updating and maintaining a program and/or parameter of a PLC and reduces costs.

The present invention relates to a method, device, and system for transmitting a program and parameter to a PLC. An adapter connecting to a port of a PLC allows an operator to simply (i) log in on a cloud server with use of a mobile terminal on which an APP is installed, (ii) download a written program or parameter, and (iii) transmit the program or parameter directly to the adapter wirelessly to transmit the program or parameter to the PLC via the adapter. An alternative embodiment may be arranged such that the cloud server transmits, to an APP of the mobile terminal over a mobile network, an instruction on what data to sample and that the APP accesses the PLC via the adapter, obtains the data, and feeds back the data to the cloud server. This simplifies the operation for updating and maintaining a program and/or parameter of a PLC and reduces costs.