| 摘要 |
A PLC control system and a self-checking method thereof are provided to confirm the abnormality and change the information about the program specific value. A process input-output part is connected to a sensor or an actuator for the interface with the process equipment. The storage unit stores the processing data which are inputted or are outputted through the operating program and the process input-output part. The first interface unit communicates with a control PC(300). The PLC apparatus comprises the first controller for controlling the first interface unit in order to transmit the operating program. The PLC apparatus controls the process input-output part and the storage unit. The second interface part(350) is connected to the first interface unit. A master program save part(360) stores the master program. The PLC control device comprises the master program save part, and the second controller. |
