| 摘要 |
PURPOSE:To raise continuity and reliability of a plant control by dividing and providing a function program in a program memory, and providing an area for storing the managing information for changing this program, on a data memory. CONSTITUTION:An instruction required for executing a sequence operation instruction processing, a control of a controller, etc. is executed by an operation control device 3, and an execution managing program for that purpose is stored in an ROM4. Plural function programs are divided and provided in a program memory 5-1 of an RAM5, the managing information of its head address, etc. is stored in a function program managing area 5-2 of a data memory, and when it is changed, this managing information is transferred to a managing information saving area 5-3. Also, a changing function program managing information area 5-4 for storing and changing a managing information of a program to be changed is provided, and a program change of every unit is executed. |
