The 1769-L32CA feeds the non-zero unit in the priority queue in the same direction (this unit is a seven-zero unit when there is a call, and zero when there is no call) into the register queue (first-in-first-out queue FIFO) according to the direction of operation of the lift, and uses the first-in-first-out readout instruction, SFRDP instruction, to feed the data in the first unit of the FIFO into the comparison register.

When 1769-L32CA approaches the deceleration position of a certain floor with a certain running direction, it judges whether there is a call signal in the same direction on that floor (upward call sign register, downward call sign register, when there is a call request, the corresponding register is l, otherwise it is 0), if there is, it compares the number of pulses of the corresponding register with the comparison register, if it is the same, it decelerates and stops on that floor: if it is not the same If it is not the same, then the data of the register is sent to the comparison register, and the original comparison register data is saved, and deceleration parking at that floor is executed.

After the action is completed, the saved data is re-fed into the comparison register to realise the stochastic logic control.1769-L32CA system uses the travel to judge the floor and converts it into BCD code output, which is displayed by LED through the hardware interface circuit.1769-L32CA can send forward running, reverse running, deceleration and braking signals to the frequency converter according to the requirements of the stochastic logic control, then the frequency converter can send forward running, reverse running, deceleration and braking signals according to the certain control law. The inverter controls the motor according to certain control laws and control algorithms. At the same time, when the system fails, PLC sends a signal to the inverter.