基于PLC的养鸡场氨气浓度检测控制系统的设计.doc

滨州学院本科毕业设计(论文) i 摘要氨气浓度是畜牧业中常见的指标之一, 畜禽的健康与氨气浓度密切相关。随着畜牧业的规模化、产业化发展, 氨气浓度成为危害畜禽健康、降低畜禽生产性能的主要因素之一。本设计将 PLC 技术引入氨气浓度检测控制系统中, 解决系统的实时动态检测问题, 从而实现自动控制。此系统主要包括检测模块、模数转换模块、控制模块以及反馈模块。通过选用合适测量范围的氨气浓度传感器, 来完成养鸡场内氨气浓度的实时检测。然后将氨气浓度经模数模块将模拟量转换为数字量, 经判别后传输给 PLC 。 PLC 通过判别结果来控制开关的闭合、断开, 从而控制电机的运行状态, 并将实时动态反馈给系统。若氨气浓度符合设定值, 控制系统停止运行, 检测模块反复检测实时氨气浓度; 若氨气浓度超出设定值, 控制系统继续运行, 直至氨气浓度达标, 达标后控制系统暂停工作, 检测模块反复检测实时氨气浓度。以上操作流程即可实现氨气浓度的实时检测、控制, 从而实现氨气浓度的自动控制。分布式的结构, 使各个模块之间相互独立, 具有便于管理、系统稳定、易于扩展等特点。关键字: 氨气浓度, PLC ,自动控制滨州学院本科毕业设计(论文) ii The F arm D esign of PLC C ontrol S ystem B ased on the C oncentration ofA mmonia Abstract Ammonia concentration is one of mon indicators of animal husbandry, ammonia concentration is closely related to livestock health. With livestock scale and industrial development, ammonia concentration have bec a me one of the main factors that lead to endanger animal health and reducing livestock production performance. This article will introduce PLC technology into the ammonia concentration detection control system to solve the problem of real-time dynamic detection system to achieve automatic control. This system prises a detection module , analog-to-digital conversion module, the control module and the feedback module. By selecting the appropriate measurement range ammonia concentration sensor, plete the real-time detection of ammonia concentration in the farm. Then the ammonia concentration by modulo module converts the analog digital, after determining the transmission to the PLC. T hrough the discrimination result of closed off, PLC can control the switch . thereby controlling the motor running, and dynamic real-time feedback to the system. If the ammonia concentration in line with the set value, the control system stops running, real-time detection module detects repeated ammonia concentration; If the ammonia concentration exceeds the set value, the control system continues to operate until the ammonia concentration standard, the standard control system suspended