| 摘要 |
A programmable logic controller (1) which controls a device (9) to be controlled, in accordance with a sequence program, and thereby acquires information from the device (9) to be controlled, and which acts as a client when connected to a server (6), said programmable logic controller (1) comprising: an external storage device (7) which stores, on an external storage medium (8), data files that are generated on the basis of the information acquired from the device (9) to be controlled; and a file transfer processing unit (5) which, upon completion of transfer of a data file stored on the external storage medium (8) to the server (6), requests that the server (6) delete the previous version of the data file stored in the server (6). |
