| 摘要 |
PURPOSE:To make it unnecessary to carry a monitor device with a person, and to efficiently execute a work for diagnosing a fault, by providing a history display control means for displaying the contents of an operation history memory without allowing them to pass through an image memory. CONSTITUTION:An operation history is stacked in an operation history memory 4, and in case of displaying the contents of the operation history memory 4 in order to diagnose a fault, a processing of a microprocessor 3' is switched to an operation history read mode by an operator's designation which is given through a keyboard input device 11. Subsequently, based on a history display control program which has been stored in a read-only memory 6, the contents of the operation history memory 4 are read, and written in a random access memory 7. This history information is displayed on a display part 1 through a selecting circuit 8 and a parallel - series converting circuit 12. In this way, a maintenance engineer can utilize desired diagnostic information for diagnosing a fault by displaying it on the display part 1 by operating the keyboard input device 11. |
