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ARCH.182 Split the system functions

Goal

Each system function of interest has been split according to defined splitting principles and met a required level of detail into for the logical architecture.

Requirements met by this process stepISO 15288 6.4.4.3 c)
Inputs
OutputsAMOD-081 Logical functional flow definition (single system capability realisation)
Methodology

The logical level of the architecture is concerned with abstract partitioning of functionality. Therefore, when we split functions at logical level, we can only do this on the basis of some logical or abstract splitting principle.

  1. Define the relevant splitting principle → proposed splitting principle and guidance can be found in ARCH.M.010 Method for definition of functionality.Method for decomposition of functions
  2. Split the system functions of interest by deciding for each function of interest which splitting principles to apply

Note: if there exist already logical functions in the model, this functions shall be reconciled with the transferred system functions or with the new leaf level logical functions as part of this process step. So that at the end only one set of consistent logical functions exists which are traced to system functions.

Note: during consolidation in ARCH.154, the function that has been transferred to logical layer and split into logical functions will be deleted.



Tools and non-human resources

Team for Capella

CardinalityOnce per functional chain of interest.
Completion criteria

The output view complies with its modelling rules.

The content of the output view represents the team's current understanding of the way these system functions should be decomposed in the logical architecture layer.

Design review

ARCH.R.5 Logical capability review

Step done by (Responsible)

Lead system architect

Provides input to/assists (Contributes)
  • System architect
  • Subsystem architect
  • Engineer
  • Expert for GoA4 railway operation
  • Cross-cutting engineer
Uses outputs (Informed)

RAMS manager

RAMS engineer

Verification & validation manager