## Color conventions for the FDC toolbox

In the blockdiagrams from the FDC toolbox, all 'normal' function blocks have standard colors: black foreground, white background, no shadows. Shadows have been used for 'Title'-blocks, which open on-line helpfiles in a HTML-browser when they are double-clicked, and 'Button'-blocks, which start Matlab programs or execute Matlab commands when double-clicked.

The 'artificial feedback loops' from the Beaver model (loops which implement an artificial causality in the model that is necessary to be able to solve the equations of motion), including the masked subsystem Hlpfcn, are magenta, in order to distinguish these signals from the external input signals which enter the model by means of Inport blocks and output signals which leave the system via the Outport blocks.

A complete list of color schemes has been given below:

Blocktype: | Color scheme:
--- | ---
Standard SIMULINK blocks, except subsystems; masked subsystems, except 'Button' and Title blocks and the artificial feedback block Hlpfcn | Black on white, no shadows
Inport and Outport blocks | Black on white, no shadows; recognizable by their rounded shape
Title blocks which are not linked to help texts | Blue on white, no shadows
Title blocks and 'Button' blocks which will display help texts when double-clicked | Blue on white with shadows
help-texts in SIMULINK windows | Red on white
'Button' blocks which start up MATLAB programs/functions when being double-clicked | Black on cyan with shadows
To Workspace blocks | Black on yellow, no shadows
Manual Switch blocks and output selectors | Black on yellow with a shadow border
Scope blocks | Black on dark green, no shadows
Artificial feedback loops and blocks which are involved in such loops (e.g. Hlpfcn in the system Beaver) | Magenta on white, no shadows
Subsystems which are linked to a model library, but which are not masked | Black on light blue, no shadows

Additionally, in the autopilot simulation systems APILOT1, APILOT2, and APILOT3, the following color conventions have been used:

Blocktype: | Color scheme:
--- | ---
Signals used for gain-scheduling (notably the airspeed V and altitude H) | Magenta on white
Reference signals, issued directly by the subsystem block Reference Signals | Red on white with shadows for the Inport/Outport blocks of these signals
Switch-setting signals from the block Mode Controller | Red on white
Reference signals which are sent to the inner loops and which are generated by the outer-loops | Black on white with shadows for the Inport/Outport blocks of these signals
To Workspace blocks | Black on yellow, no shadows
Subsystems which are linked to a model library, but which are not masked | Black on light blue, no shadows