Patent ID: 7024588

Claim:
A system monitoring system comprising: external monitoring means for monitoring the state of a controller within an apparatus to be monitored, the state being obtained when a control program stored in storage means in the apparatus controls, via an internal bus of the apparatus, said controller to operate; bus-access detection means for detecting, in real time, based on internal bus information, each match of an address set with an address line on said internal bus by said controller, said bus-access detection means being external to said controller and internal to said apparatus; execution address detection means for detecting execution address information of said external monitoring means in real time based on said internal bus information, said execution address detection means being external to said controller and internal to said apparatus; wherein information on each match and the execution address information are output to said external monitoring means in real time; a display for said information on each match and said execution address information on said internal bus by said controller; wherein said display numerically displays data on said internal bus when latching the data; wherein said bus-access detection means generates a hit signal based on a comparison of said internal bus information with access points having predetermined values; and if said internal bus information matches plural access points said hit signal is generated for said access point having a lower predetermined value; and wherein said execution address detection means generates said hit signal based on a comparison of said internal bus information with real-time events having predetermined values; if said internal bus information marches plural real-time events, said hit signal is generated for said real-time event having a lower predetermined value.