毕业论文--基于PLC的车辆出入库管理系统设计

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1、 摘摘 要要 本设计是基于 PLC 的车辆出入库管理系统，采用光传感器采集信号，完全使用 PLC 控制， 进行车辆出入库时的统计和显示工作， 采用两位 LED 来显示车库内车辆的实际数量。 使用两个光传感器来监控车辆的进出并完成计数工作，车辆进入时经过两个传感器使显示 数字加一，车辆外出时经过两个传感器使显示数字减一，但当车辆只经过一个传感器时不 计数。为了防止意外计数错误，本系统采用反复程序校验，来提高系统的可靠性。首先， 注意控制两个传感器之间的距离，用程序验证进出车库的是否是车辆，当人通过传感器时 不计数；其次，采用逻辑互锁方式，启动加计数则要锁定减计数，产生加计数脉冲时则要 锁定减计数

2、脉冲，如此以保证可靠性；最后，及时的进行复位处理，以免车辆在传感器附 近作往返运动时错误计数。 优点：本系统采用反复逻辑判定，计数动作准确可靠；设备简单安装方便；自动化程 度高，便于实现无人值守；抗干扰能力强，环保无污染；便于需要时进行扩展。 缺点：PLC 的输入口资源优点过于浪费 关键词：关键词：PLC 车辆 传感器 计数 可靠性 ABSTRACT This design is based on PLC vehicles in-out warehouse management system, adopting light sensors to collect signals, fully u

3、se PLC control, the statistics and unloading vehicles, using two display work LED to show the actual number of garages vehicles. Use two optical sensors to monitor and complete count passing in and out of traffic, car entering after two sensors to display when digital plus one, vehicles go out after

4、 two sensors to display digital subtraction one, but when the vehicle just after a sensor not counting. In order to prevent accidental counting error, this system USES repeated program check, to improve the system reliability. First, attention to control the distance between the two sensors, and the

5、 garage with program verifying whether vehicles, when people dont count; through the sensor Secondly, adopting logic interlock way, start to add count is reduced count, produce the lock is added to lock count pulse, so reducing counting pulse to ensure reliability; Finally, timely to reset treatment

6、, lest vehicle near the sensor for round-trip motion error count. Advantages: the system USES judgement, counting action repeatedly logic accurate and reliable; Simple equipment installation is convenient; A high degree of automation, is easy to realize the unattended; Strong anti-jamming capability, environmental pollution; Facilitate expand when needed. Faults: PLC input port resource advantage too waste . Key words：PLC , vehicle ,sensor ,counting ,reliability 目 录 引言