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除尘室PLC控制

在制药、水厂等一些对除尘要求比较严格的车间,人、物进入这些场合首先需要进行除尘处理,为了保证除尘操作的严格进行,避免人为因素对除尘要求的影响,可以用PLC对除尘室的门进行有效控制。下面将介绍某无尘车间进门时对人或物进行除尘的过程。
1. 控制要求

人或物进入无污染、无尘车间前,首先在除尘室严格进行指定时间的除尘才能进入车间,否则门打不开,进入不了车间。除尘室的结构如图7-37所示。图中第一道门处设有两个传感器:开门传感器和关门传感器;除尘室内有两台风机,用来除尘;第二道门上装有电磁锁和开门传感器,电磁锁在系统控制下自动锁上或打开。进入室内需要除尘,出来时不需除尘。
具体控制要求如下:
进入车间时必须先打开第一道门进入除尘室,进行除尘。当第一道门打开时,开门传感器动作,第一道门关上时关门传感器动作,第一道门关上后,风机开始吹风,电磁锁把第二道门锁上并延时20s后,风机自动停止,电磁锁自动打开,此时可打开第二道门进入室内。第二道门打开时相应的开门传感器动作。人从室内出来时,第二道门的开门传感器先动作,第一道门的开门传感器才动作,关门传感器与进入时动作相同,出来时不需除尘,所以风机、电磁锁均不动作。
2. I/O分配

输入 输出
第一道门的开门传感器 I0.0 风机1 Q0.0
第一道门的关门传感器 I0.1 风机2 Q0.1
第二道门的开门传感器 I0.2 电磁锁 Q0.2
3. 程序设计

除尘室的控制系统梯形图程序如图7-38所示。
4. 程序的调试和运行
输入程序编译无误后,按除尘室的工艺要求调试程序,并记录结果。
水塔水位的模拟控制实训
用PLC构成水塔水位控制系统,如图7-39所示。在模拟控制中,用按钮SB来模拟液位传感器,用L1、L2指示灯来模拟抽水电动机。
1. 控制要求

按下SB4,水池需要进水,灯L2亮;www.plcs.cn直到按下SB3,水池水位到位,灯L2灭;按SB2,表示水塔水位低需进水,灯L1亮,进行抽水;直到按下SB1,水塔水位到位,灯L1灭,过2秒后,水塔放完水后重复上述过程即可。
2. I/O分配

输入 输出

SB1:I0.1 L1:Q0.1
SB2:I0.2 L2:Q0.2
SB3:I0.3
SB4:I0.4
3. 程序设计

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