Accident STAMP (Systems Theory Accident Modeling and Processes) To effect control over a system requires four conditions Goal Condition: The controller must have a goal or goals (e.g, to maintain a setpoint) Action Condition: The controller must be able to affect the system state Model Condition: The controller must be(or contain) a model of the system Observability Condition: The controller must be able to ascertain the state of the system Human Supervisor ( Controller) Model of Model of Process Automation Process models must contain Displays Controls Required relationship among system vars Current state(values of system vars) Automated Controlle The ways the process can change state Model of‖ Model of Process‖ interfaces Sensors Controlle Measured variable Controlled variables Process Process Process outputs inputsc ✎✞✝✞✏✄✝✞✍✄☛✞✟☞✑③❏❑▲✞➨✞■❑❏✬▲✞➩ ￾✂✁✄✁✄☎✆✞✝✞✟✞✠✞✡☞☛✞✆✞✝✞✌✍ STAMP (Systems Theory Accident Modeling and Processes) To effect control over a system requires four conditions: Goal Condition: The controller must have a goal or goals (e.g., to maintain a setpoint) Action Condition: The controller must be able to affect the system state. Model Condition: The controller must be (or contain) a model of the system Observability Condition: The controller must be able to ascertain the state of the system. ➦④➋●➌❢➎➈➂✲➇➈➇⑦➝➑➌❢↕✲➂➐➙➇⑦➝➄➣✻➇➈➉❢➎➈➌➐➏❍➉✺➅❦↔❑➏❢➧ ➓➔➂❢→➐➣✲↔ ➋➍➂✲↕❫➋➍➂➐➙➅✲➉➛↔➌❦➏✻➇➜➁❢↔❑➊➑➅➐➝➞➌➐➏✻➒➄➇➈➆❄➇➈➉✄➂➐➝➠➟➈➅➐➋➍➇ ➡➣❢➋✣➋➍➂➐➏✻➉✲➇❄➉✺➅❢➉✺➂❫➢➍➟➈➅❦➙❑➣❍➂✲➇r➌✲➤✲➇❄➆➈➇➈➉✄➂➐➝➠➟➈➅➐➋➍➇➈➥ ➀♦➁✻➂➄➃❺➅❢➆➈➇r➉✂➁❍➂❫➊✲➋➍➌✲➎➈➂❢➇➈➇r➎➈➅➐➏➑➎✯➁✻➅➐➏✻➒❢➂➄➇➈➉✄➅✲➉✄➂ Displays Controls inputs Process outputs Process Controlled Process variables Controlled Process Interfaces Model of Model of variables (Controller) Human Supervisor Automation Model of Process Model of Measured Actuators Sensors Automated Controller Disturbances