This article proposed that one kind utilizes programmable controller (PLC) to pass in and out to the residential district parking lot automobile and to park the instruction to carry on the management the plan, this plan raised the rated capacity greatly, maintains the cycle to be short, and debugs conveniently, the cost is low. Simultaneously made our garage gate to increase many noble elegant breath. The programmable controller (PLC) develops in relay's control and in computer control's foundation, is one kind applies in the industrial production process control, has the real-time digitization handling ability hardware equipment, provides the redundant reliable for the industrial automation automatic control device. As a result of gating system's serviceability, programmable controller (PLC) the superiority, I design the automatic control device for this reason, whether there does it pass depending on the vehicles detector automatic detection vehicles, has installs the maintenance simple, convenient reliable, the energy conservation and the security and so on many kinds of characteristics.
key word: PLC parking lot garage gate programmable controller
