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Only relevant environment effects are of course considered.
We don ??™ t generally have to model the fact that most systems won ??™ t survive umpteen
degrees Celsius or total fl ooding. An environmental effect is denoted as a box
with a sun symbol ( Figure 2.16 ).
An actuator is a special external system that serves our system in infl uencing
its environment. In contrast, a sensor is a special external system that accepts
information from the environment and passes it on to the system.
Similar to an external system, an actuator is denoted as a box with an additional
cogwheel symbol, while a sensor is denoted with an additional symbolic
dial gauge ( Figure 2.17 ).
Actuators and sensors are special categories for technical systems. Other categories
can be introduced as needed by the project. For example, the sender and
receiver categories with their respective symbols are more suitable than actuators
and senders in a communication environment.
A mechanical system is a special external system that has only mechanical
aspects from our system ??™ s view.


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