In the elevator shaft on each floor is equipped with a magnetic sensors, respectively 1YG, 2YG, 3YG, 4YG, 5YG, while the car is equipped with a side length of the magnet separator plate, if the elevator up from the first floor, then magnet separator plate and then click insert sensor. When the magnet separator plate inserted into the sensor, the sensor inside the reed contact is closed, the corresponding floor control relay 1JZ ~ 5JZ pull.
According 1JZ ~ 5JZ operation, control 1JZ1 ~ 5JZ1 appropriate action. Seen from the circuit 1JZ1 ~ 5JZ1 have pull self-holding function, so 1JZ1 ~ 5JZ1 always has one and only one pull.
PLC ONE 