For this function, a little more sophisticated, we need switches (keys) or double sensors. This is necessary, because when a sensor connects in one half the other disconnects. We can use an H switch for this purpose, where the sections will be connected alternately. The circuit of this function implemented with relays is shown in the figure. The truth table for this function IS:
A B O
0 0 0
0 1 1
1 0 1
1 1 0
| Clique na imagem para ampliar |
