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logic functions NOT and YES.

Now suppose that the circuit should have a security system that will stop the gate during the race encounters an obstacle. This condition can be satisfied predisponedo a sensor on the gate that blocks the flow of air that feeds the circuit when it is operated. This sensor can be a button valve 3 / 2 NA (N Button Figure 9) that lets air in normal conditions and when pressed it locks the transition (Fig. 12). The signal of the button N denies the passage of air for which this type of valve is defined as NOT.

fig. 12 - logical NOT function .

assigning "0 / 1" conditions "absent / present 'signal N input and output signal of the valve will NOT get the truth table on the logical NOT function below.

tab. 5 - Table of truth on the logic function NOT.

Similarly, the logic function allows YES the passage of a signal only in his presence. This function can be realized with a valve 3 / 2 NC, and is usually used for the regeneration of the signals, because all they need is a low-pressure (Y in Fig. 13) to obtain a higher pressure ("Signal" in Fig . 13).

fig. 13 - YES logic function.

tab. 6 - Table of YES on the logic function.

Ultimately we can build the complete diagram of the automated gate controlled by two different planes and with proximity sensor to stop N security (Fig. 14).

fig. 14 - complete pneumatic circuit diagram for the movement of a gate.

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