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GE IC693MDL930
GE IC693MDL930
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*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*道门进入除尘室，进行除尘。当*道门打开时，开门传感器动作，*道门关上时关门传感器动作，*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，*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*道门的开门传感器 I0.0 风机1 Q0.0 *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：Q0.1SB2：I0.2 L2：Q0.2 SB3：I0.3 SB4：I0.4 3. 程序设计 |
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GE IC693MDL930
GE IC693MDL930
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