In order to ensure normal teaching order, protecting students healthy growth, ensuring that national (property) is not lost, to prevent or minimize the occurrence of safety accidents, follow the prevent, rescue each other, ensure safety and reduce losses principle, according to the local conditions, make the management system. 1, the principal is the responsibility of school safety, school security under the leadership of President security work leading group. The head teacher to the leadership team is responsible for, implementation of the accountability system. 2, school monthly student knowledge about safety education, education should be diversified in the form every safety education for students of classes per week should be targeted. To carry on emergency issues dealing with education in General, self-help and mutual rescue knowledge. Emergency calls (such as 110, 119, 122, 120, and so on) use common sense in education. 3, the establishment of major accident reporting system. School students report major accident within an hour of education; student run and disappearances to report; report of the accident to a written report in triplicate, a correctional centre, a police station, a township peoples Government shall not conceal the accident. 4 week, teachers are on duty system, establish and improve the leadership values; strengthen the education, management of teaching activities in schools to ensure normal teaching order; responsible for school safety leadership always maintained close contact and district police stations, canvassing support from the police station on school safety and help. 5, strengthening teachers moral education, establish a dedicated love, improving education quality, observe the students psychological changes at any time and take preventive measures, no corporal punishment and covert corporal punishment on students, student out of the classroom, schools may not be. 6, units or departments use student Street propaganda or participate in the celebrations, as well as participating in other social work, without approval of the Correctional Centre, school principals consent, without organization. Without the approval of relevant departments, may organize students to participate in fire fighting, disaster relief and so on. 7, schools should educate students to obey the school rules and regulations, on time, on time home to prevent accidents. 8, school to school inspections on a regular basis, found hidden in time, and in severe cases, it is hard to eliminate immediately closed, and reported to the local peoples Government, education, and rule of law section. 9, the school should always check the internal walls, retaining walls, ponds, railings, handrails, doors, Windows, staircases and a variety of sports, extracurricular activities, facilities such as fire safety, infrastructure security, unsafe facility to immediately repair and demolition to ensure that teachers and students work, learn, live venues and facilities are safe and reliable. Song Lin Xiang Liu Jia ping elementary school March 2016 song Lin Xiang Liu Jia ping primary school fire safety systems to enhance fire safety, protection of public property and the life and property safety of teachers and students, school fire safety into day-to-day management, is developing the following fire safety system. 1, strengthen fire safety education of the whole school. According to the requirements of the Fire Services Act, so that everyone has of keeping fire control safety, protecting fire control facilities, fire prevention, reports of fire诚 信 声 明本人声明：1、本人所呈交的毕业设计（论文）是在老师指导下进行的研究工作及取得的研究成果；2、据查证，除了文中特别加以标注和致谢的地方外，毕业设计（论文）中不包含其他人已经公开发表过的研究成果，也不包含为获得其他教育机构的学位而使用过的材料；3、我承诺，本人提交的毕业设计（论文）中的所有内容均真实、可信。作者签名： 日期： 年 月 日毕业设计（论文）任务书 题目： 基于PLC双电源开关设计 姓名 邓铁军 学院 专业 班级 学号 指导老师 谭季秋 职称 副教授 教研室主任 一、基本任务及要求：双电源自动转换开关电器主要用在重要会议室、机场、宾馆等紧急供电的双电源系统。系统能比较准确地测量各相电压参数，根据测量结果产生相应执行动作。基本任务： 1.控制系统硬件设计。PLC选型、I/O口设计、系统外部连线电路设计、执行元件的选择。 2.控制系统软件设计。PLC梯形图、语句表。 3.编写设计说明书。 二、进度安排及完成时间：1.2009年2月，布置设计课题，交代具体任务。 2.2月23日-3月15日，查阅资料，翻译英文资料，撰写开题报告和文献综述 3.3月15日-5月20日，毕业设计，约在4月中旬进行毕业实习，并撰写实习报告。 4.5月21日-6月1日，撰写毕业设计论文，并交电子文档给导师初阅。 5.6月2日-6月5日，按格式和要求修改毕业论文，提交毕业设计论文，打印导师评阅。 6.6月13日-6月15日，按导师修改意见，修改论文，打印装订成册，答辩资料准备。 7.6月13日-6月17日，毕业答辩。毕业资料收集汇总，存档。 目 录摘要