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US 4,550,278 AGranted
Control device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorKimio Yamanaka
Life of this patent
Estimating the term…
Abstract
A control unit is provided with a memory unit for storing data representative of errors occurring in the system, as well as the order in which sequential errors occurred and the number of occurrences of the errors. An error "history" may be displayed from these data, to assist in pinpointing the cause of the trouble.
Claims4
In a control device having a control memory for temporarily storing data, the operation of which is controlled by a program, and a process I/O unit serving as an interface for external data, the improvement comprising;
- memory means for storing trouble data representative of errors and abnormal operations in said memory and process I/O unit, in combination with the sequence of occurrence of said errors and the number of occurrences of said errors;
- and
- means for editing and displaying said trouble data stored in said memory section, together with an error occurrence history.
Dependencies are inferred from the claim text.