| 摘要 |
<p>A programmable controller having a loading feature for changing such control information as control programs. The controller comprises a load execution unit and an allocation unit. The load execution unit checks, upon receipt of new control information, the execution state of the program to be changed based on management information stored in a management table. The load execution unit loads the new control information into an area indicated by addresses held in a management table if the program is in non-executing or non-executable state. The load execution unit loads the new control information into a reserved area indicated by addresses held in a reserved table if the program is in executing or executable state. The allocation unit replaces the content of the addresses held in the management table with the content of the addresses held in the reserved table after the load execution unit has loaded the new control information into the reserved area.</p> |
