11 System States and Conditions for the Vision System ToC Previous Next

11.6 Structuring of Vision System State information ToC Previous Next

11.6.1 Overview ToC Previous Next

System state information is often used to benchmark the reliability of a system. Therefore on a time scale it is estimated how long the system was productive, defective or in maintenance. To support this, a system should be able to publish its current state in a way enabling a client to do such estimation.

This standard follows the scheme of 6 basic system states defined by SEMI E10 standard (SEMI E10: Specification for Definition and Measurement of Equipment Reliability, Availability, and Maintainability (RAM) and Utilization). The following diagram shows how the total time of existence of a system is divided into different categories. From the left to the right the model gets more detailed.

Table 137 – E10 system states

Total Time Operations Time Uptime Manufacturing Time Production PRD
        Standby SBY
      Engineering ENG  
    Downtime Scheduled Downtime SDT  
      Unscheduled Downtime UDT  
  Nonscheduled Time NST      

If the optional SystemState variable exists on the server, the vision system shall continuously map its internal state to one of the six generic states on the right. This current state shall be published in the SystemState variable in the interface.

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