| 摘要 |
PURPOSE:To simplify the recovery work of a system and to attain cost down by controlling a facility equipment directly by a terminal equipment by switching a line to a backup line when a controller goes down, and storing a control content in a memory. CONSTITUTION:When a computer main body 2 goes down, a line switching part 11 detects the fact, and disconnects the terminal equipment main body 9 from the line 4, and connects it to the line 6. Thereby, an operation command from the terminal equipment 9 is supplied directly to a controlled object 3 through the path (the line switching part 11 the line 6 the controlled object 3). And at this time, the operation command is recorded on a retention file 8. When the computer main body 2 is recovered, the line switching part 11 detects the fact, and starts the usage of the line 4 by stopping the usage of the line 6, and the content of the retention file 8 is transferred to the operation recording file 7 of the computer main body 2. In such a way, the recovery work of the system can be simplified. Also, since the line switching part 11 or the retention file 8 can be constituted by changing the program of the terminal equipment 9, the cost down of the system can be attained. |
