Device for processing programmable logic controller program

Abstract

The present disclosure provides a device for processing a programmable logic controller (PLC) program. In one embodiment, the device includes a storage containing PLC programs stored on a block basis, and a program block table defining storage locations of the PLC programs; and a controller configured: when a PLC program is modified during a PLC is operating, to determine a start address of a storage location where the modified PLC program is to be stored with referring to a block number of the modified PLC program, size information of the modified PLC program, and the program block table; and to store the modified PLC program in the storage based on the determined start address. According to the present disclosure, multiple users may simultaneously access a PLC and then may simultaneously modify PLC programs during the PLC is operating.

Dependencies are inferred from the claim text.