| 摘要 |
PURPOSE:To actuate the fault maintenance function to only a necessary part when an abnormal state occurs by calling a separate function program whose function is the same and to which the fault maintenance function is added from an external storage device instead of its program, when the separate function program detects an error by an error detecting mechanism. CONSTITUTION:When error detecting mechanisms 31, 32 and 39 provided on separate function programs 21, 22 and 29 detect abnormality, it is informed to a loader 12, and also, reset to a main program 11, the main program 11 is interrupted and the control is returned to a monitor system 10. The loader 12 calls only its program with respect to the separate function program 41 whose function is the same and to which a fault maintenance function is added, etc., from an external storage device instead of the informed separate function program 21, etc., and also, rewrites a separate function program start address table 13 and returns the control to the monitor system 10. The monitor system 10 actuates the main program 11 again. In such a way, when an abnormal state occurs, the fault maintenance function to only a necessary part can be actuated. |
