Examlex
Intense UV light from the sun is lethal to living things.Currently,some 99% of all incoming UV is blocked by the ozone layer which didn't develop until well after the first life-forms.How might the very earliest organisms have avoided the intense UV rays?
Input Module
A component of a modular PLC or control system that receives signals from input devices, such as sensors, and converts them into a form that the processor can use.
Output Module
A component in a control system that facilitates the transfer of digital or analog signals from the controller to actuating devices.
Open Switch
A switch that is in a default state of breaking the circuit, preventing the flow of electrical current until it is closed.
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