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Chapter 10. openETCS Model Current Train Position double double Position at Entering Post Trip Check, if allowed distance for reversing in this mode (national value) was exceeded. bool double Allowed Reversing Disance in Post Trip Post Trip Entered double - > double double 0.0 (CONST) double > double Current Train Speed Check for reverse movement/negative speed. bool bool & Check if train is moving in reverse and train already has overrun maximal allowed distance in reverse. Forward movement is never allowed. bool >=1 bool Current Train Speed double > double 0.0 (CONST) bool Check for forward movement/positive speed. Movement Supervision Failure Figure 10.22.: Reverse movement supervision in Post Trip as gSubFunctionBlock graph 10.2.8. System Failure Mode System Failure is activated if an error is detected in the EVC during the execution in other ETCS Modes that causes a system failure [78, p. 12]. As described in Section 7.2, the corresponding oModeGuard object “c13” in Figure 10.1 is typically not activated by a Boolean data flow, but is used as FailureGuard property in the corresponding gEVCStateMachine instances. Since a system failure means that the system or rather the EVC cannot longer perform its required functionality, this is a threat to safety. Correspondingly, the SRS defines for the System Failure Mode that the emergency brakes are permanently activated. Since an error may occur in any Mode and any Application Level, System Failure is modelled for Application Level 0 and 1. 10.2.8.1. Application Level 0 The model of System Failure in Level 0 is sketched in Figure 10.23. Once this Mode is entered, it can only be left by input from the driver via the DMI. It can be either switched to No Power (Subsection 10.2.1) via the “c29” oModeGuard object or to Isolation (Subsection 10.2.9) via the “c1” oModeGuard object. 10.2.8.2. Application Level 1 Since the failure handling does not differ for different Application Levels, the model for Level 1 matches exactly the model of Level 0 and is omitted. 200
10.3. Incoming Balise Telegrams c1 c29 Sub-Function: DMI in System Failure bool bool System Isolated by Driver System Unpowered by Driver TRUE (CONST) bool EMERGENCY BRAKE Figure 10.23.: System Failure Mode in Application Level 0 10.2.9. Isolation Mode The SRS defines that in Isolation the ETCS on-board equipment is isolated from the train and does not have any responsibilities for train safety [88, p. 9]. Since isolation means from the perspective of the openETCS (meta) model that the object types representing hardware interfaces (e.g. oServiceBrake) are not available, the model only consists of oDMIOutput objects for displaying the information about he current state to the driver. 10.2.9.1. Application Level 0 The trivial model for Application Level 0 is shown in Figure 10.24. Sub-Function: DMI in Isolation Figure 10.24.: Isolation Mode in Application Level 0 10.2.9.2. Application Level 1 Application Level 1 directly corresponds to Level 0 and is omitted. 10.3. Incoming Balise Telegrams According to the sub-graph structure of the openETCS meta model in Section 7.2, the gCommunicationReader graph type is a child of the gMainFunctionBlock type, which is referenced by decompositions of oCommunicationReader objects. Thus, the following subsections contain a description of gCommunicationReader instances that are often used in the openETCS model. 201
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Open Source Software for Train Cont
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Datum des Promotionskolloquiums: 21
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Acknowledgments I would like to tha
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Abstract This document describes th
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Contents 3.3.3. Rascal . . . . . .
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Contents 8.4. Behavioural Design .
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Contents D.3. Domain Framework Mode
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List of Figures 6.4. Simple CORBA u
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List of Figures 10.27. General read
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Chapter 1. Introduction Railway Con
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Chapter 1. Introduction MontiCore M
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Chapter 1. Introduction ERTMS Forma
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Part I. Background 9
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Chapter 2. Concepts for Safe Railwa
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4The GOPPRR Meta Meta Model - An Ex
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4.1. Concrete Syntax Description Fo
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4.2. GOPPRR C++ Abstract Syntax Mod
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4.2. GOPPRR C++ Abstract Syntax Mod
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4.5. The Object Constraint Language
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4.5. The Object Constraint Language
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4.6. Tool Chain where artefacts are
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4.7. Conclusion External Artefacts
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Part II. Dependability 55
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Chapter 5. Verification and Validat
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6Security in Open Source Software A
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6.1. Memory Management Open Meta Me
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6.2. Hardware Virtualisation a fixe
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6.2. Hardware Virtualisation in a v
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6.2. Hardware Virtualisation Again,
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6.2. Hardware Virtualisation the fa
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Part III. openETCS Case Study 77
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Chapter 7. openETCS Meta Model far
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Chapter 7. openETCS Meta Model gEVC
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Chapter 7. openETCS Meta Model gEVC
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Appendix B. openETCS Meta Model Con
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DopenETCS Domain Framework D.1. Dom
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D.2. Domain Framework Source Code 8
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D.3. Domain Framework Model 32 m_pT
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Appendix E. openETCS Generator 39 <
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Appendix E. openETCS Generator 200
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Appendix E. openETCS Generator 46 4
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FMetaEdit+ Generators F.1. GOPPRR X
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GopenETCS Unit Testing G.1. Unit Te
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Appendix H. openETCS Simulation 14
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Glossary ANTLR ANother Tool for Lan
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Glossary EVC An European Vital Comp
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Glossary OEM An original equipment
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Glossary XML The Extensible Markup
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Bibliography [12] “EN 50128 - Rai
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Bibliography [39] ——, ““Ope
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Bibliography [69] T. J. Parr and R.
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Index Artefact, 51 Automatic train
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Index Linux, 149 Memory management,
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