S7-200系列可编程控制器有直流24V输出接线端，该接线端可为输入传感器（如光电开关或接近开关）提供直流24V电源。
1．中央处理单元（CPU）
要先弄清除控制系统的I/O总点数，再按实际所需总点数的15～20％留出备用量（为系统的改造等留有余地）后确定所需PLC的点数
充分发挥PLC的功能，**限度地满足被控对象的控制要求，是设计PLC控制系统的首要前提，这也是设计中**的一条原则。这就要求设计人员在设计前就要深入现场进行调查研究，收集控制现场的资料，收集相关**的国内、国外资料。同时要注意和现场的工程管理人员、工程技术人员、现场操作人员紧密配合，拟定控制方案，共同解决设计中的重点问题和疑难问题。
2．湿度
（3）可编程控制器有监视定时器等自检功能，检查出异常时，输出全部关闭。但当可编程控制器CPU故障时就不能控制输出，因此，对于能使用户造成伤害的危险负载，为确保设备在状态下运行，需设计外电路加以防护。
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福建省福州市闽侯甘蔗街道阳光城领海1栋2608室
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