HF-KP43BK
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14500124-001 4500123-001
2．编程器的选择
PLC是一种用于工业生产自动化控制的设备，一般不需要采取什么措施，就可以直接在工业环境中使用。然而，尽管有如上所述的可靠性较高，抗干扰能力较强，但当生产环境过于恶劣，电磁干扰特别强烈，或安装使用不当，就可能造成程序错误或运算错误，从而产生误输入并引起误输出，这将会造成设备的失控和误动作，从而不能保证PLC的正常运行，要提高PLC控制系统可靠性，一方面要求PLC生产厂家提高设备的抗干扰能力；另一方面，要求设计、安装和使用维护中引起高度重视，多方配合才能完善解决问题，有效地增强系统的抗干扰性能。因此在使用中应注意以下问题：
PLC可以通过通迅接口与显示终端和打印机等外设相连。显示器作为人机界面（HMI）是一种内含微处理芯片的智能化设备，它与PLC相结合可取代电控柜上众多的控制按钮、选择开关、信号指示灯，及生产流程模拟屏和电控柜内大量的中间继电器和端子排。所有操作都可以在显示屏上的操作元件上进行。PLC可以方便、快捷地对生产过程中的数据进行采集、处理，并可对要显示的参数以二进制、十进制、十六进制、ASCII字符等方式进行显示。在显示画面上，通过图标的颜色变化反应现场设备的运行状态，如阀门的开与关，电机的启动与停止，位置开关的状态等。PID回路控制用数据、棒图等综合方法反映生产过程中量的变化，操作人员通过参数设定可进行参数调整，通过数据查询可查找任一时刻的数据记录，通过打印可保存相关的生产数据，为今后的生产管理和工艺参数的分析带来便利。
如果系统较大，远程单元、本地机架数量、每个机架的模块数量的限制，并非出于系统功能和技术上的限制，而是由于使用规范性的限制。在系统硬件组态时，要考虑这些模块的搭配作用。
2．湿度
要注意的是只用到一个PLSY指令，这是因为它的输出如所要求的那样，直接与四个电机中的每个相连(一个电机对应于一个窗户)。检测窗户位置为全开或全关，如果其中一个条件存在，与它对应的控制电机就关断。

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