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with your own rules, you can apply these internally calculated aspects to triggers
and conditions of signals (and other elements), too, and combine them with the
status of other elements.
Macros are used to operate other elements.
12.6 Macros
They are very similar to push buttons in the switchboard (see section 2.5, “Signals and
Accessories”). Like push buttons they are also able to perform operations (see section
12.3, “Operations”). Unlike push buttons they are not placed in a switchboard. Instead
macros are for example used in the operations called by other elements (see section
12.3, “Operations”), executed in schedules (see section 5.10, “Schedules”), executed in
timetables (see section 13.6, “Timetables”) or assigned to engines as part of their functions
(see section 3.6, “Headlights, Steam and Whistle”).
In this way macros are invisible and work in the background of the program.
Engine functions assigned to macros can only be executed, if the macro is executed in
the context of an engine. This is the case, if the macro is assigned to another engine
function (in this way engine functions can be triggered indirectly by other engine functions),
or if the macro is assigned to a schedule. If the macro is not executed in the context
of an engine (e.g. by a timetable), then all engine functions contained in the macro
are ignored.
Example: Automatic Engine Whistle
Engine or Trains running a schedule shall blow their whistle for exactly two seconds
when passing a certain section.