System Phases, Modes, and States of Operation in .NET

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EXAMPLE 19.3
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If the system is in the OFF Mode, placement of the Power Switch in the ON position (e.g. ASYNChronous triggering event) initiates Transition ID T1. Transition from the OFF MODE to the POWERUP INITIALIZATION Mode is constrained to 30 seconds maximum. This leads to various power system stabilization capability and performance requirements.
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System Phases, Modes, and States of Operation
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Table 19.2 Modal transition table example Current Mode n OFF ACTIVATE ACTIVATE CONFIGURE CONFIGURE CONFIGURE Etc. Triggering Event T1 T2 T6 T4 T3 T5 Triggering Event Condition Power Switched ON I/O Device I/O Device I/O Device I/O Device I/O Device Event Type Transition Constraints (seconds) 30 Sec. 3 Sec. 3 Sec. 3 Sec. 3 Sec. 3 Sec. Next Mode n+1 POWER-UP/ INITIALIZATION CONFIGURE NORMAL OPERATIONS POWER-UP INITIALIZATION CALIBRATE POWER-UP INITIALIZATION
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ASYNC ASYNC ASYNC ASYNC ASYNC ASYNC
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Author s Note 19.7 Note that the process of identifying system modes of operation and modal transitions is highly iterative and evolves to maturity. Since subsequent technical decisions are dependent on the system modes decisions, your role as an SE is to facilitate and expedite team convergence. Analyzing Mode Transitions. Modal transitions represent interfaces whereby control ow is passed from one mode to another. While the modes characterize SYSTEM level operations, there may be instances whereby different PRODUCTs or SUBSYSTEMs provide the mode s primary capabilities. If separate system development teams are addressing the same modes, make sure that both teams operate with the same set of assumptions and decisions. Otherwise, incompatibilities will be created that will not surface until system integration and test. If left undiscovered and untested, a potential hazard will exist until eld system failures occur, sometimes catastrophically. The challenge for SEs is to ensure compatibility between any two modes such that initializations and conditions established for one mode are in place for the successor mode processing. The intent is to ensure that modal transitions are seamless. How do you ensure consistency Document the modes of operation, Mission Event Timeline (MET), and modal transitions in the system s ConOps or operational concept description (OCD) document. Final Thoughts about Modal Transitions. In our discussion of system operations and applications, we highlighted various types of system applications single use, reusable, recyclable, and so forth. Most reusable systems are characterized by cyclical operations. Cyclical systems have a feedback loop that typically returns work ow or control ow back to the pre-mission phase of operation, either powered down or prepared for the next mission. Now consider a system such as the Space Shuttle s External Tank (ET). From a mission perspective, the ET s fuel resource is a consumable item and the ET s entity is an expendable item. At a speci c phase of ight and MET event, the ET is jettisoned from the Orbiter Vehicle, tumbles back toward Earth, and burns up on reentry into the atmosphere. In the case of an expendable system such as the ET, one might expect the modes of operation to be sequential without any loop backs to previous modes. However, from an SE design perspective, ET operations involve systems that may require cycling back to an initial mode due to scrubbed launches. Therefore, expendable systems require modes of operation that ultimately transition to a point of termination mode such as REENTRY.
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19.5 Understanding System States of Operation
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Generalized Modes of Operation for Large, Complex Systems
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The preceding discussions addressed a simple product example as a means of introducing and illustrating system modes of operation. When you investigate the modes of operation for large, complex, multipurpose, reusable systems, additional factors must be considered.
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EXAMPLE 19.3
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Example considerations include recon guration, calibration, alignment, replenishment of expendables, and consumables.
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As in the case of the System Operations Model, we can de ne a template that can be used as an initial starting point for identifying classes of modes.
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