Standard Solution - Easy Electronics xLogic Micro PLC User Manual

Requirements for a Ventilation system
A Ventilation system supplies fresh air into a room and exhausts the contaminated
air. Let us look at the following sample system:
•
A room contains an extractor fan and a fresh-air fan.
•
Each fan is monitored by means of a flow sensor.
•
The pressure in the room may rise above the atmospheric pressure.
•
The fresh-air fan may only be switched on if the flow sensor signals the safe
operational state of the extractor fan.
•
A warning lamp indicates failure of one of the fans.

7.3.1 Standard solution

The control circuit diagram of Ventilation system formerly as follows:
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