And the interfaces have analog input , analog output and digital input / output . we have used differently cards , such as pc - 6330d a / d card , pcl - 728 d / a card based isa bus , ipc - 5375 i / o card and so on . in addition , we select micro - stir switches and pressure sensors as sensor elements to inspect the system and choose relays and induction valves to control the bicycle pump and the motor 总线采用isa内部总线；接口主要有模拟量输入接口、模拟量输出接口、开关量输入输出接口等，课题分别选用pc - 6330d型a d板卡、基于isa总线的型号为pcl - 728的d a板卡、型号为ipc - 5375的i o板卡；另外，课题选用了微动式行程开关、压力变送器作为传感元件检测系统，选用继电器、电磁控制换向阀实现对气缸、电机的控制；采用vc + + 6 . 0编制控制软件，实现了纤维铺放技术的计算机控制。
In addition , there is 8 on - off signal data input ( di ) passways ( 24 vdcs light separate ) ; 8 on - off signal isolated data output ( do ) passways ( contact without power , 1a / 220v ) ; 4 analog signal data output passways ( 4 ~ 20ma ) , every of them can be set as a certain analog signal ' s close ring control output passway 另外，还有8路开关量输入( di )通道( 24vdc光隔) ； 8路隔离开关量输出( do )通道(无源触点， 1a 220v ) ； 4路模拟量输出( 4 20ma )通道，每一路均可设定为某一路模拟量输入的闭环控制输出。
These field control modules include : analog input / output module ao / ai , digit input / output module di / do , sound alarm module , record module , etc . the key works is to develop canbus net card and its driver which is based on can2 . 0a , configure software for the server pc and makeup communication protocol as well as modules driver programs 现场控制模块主要有模拟量输入输出ai / ao模块,数字量输入/输出di / do模块,语音报警模块和报警记录模块。本设计主要开发上位机组态软件和网卡通讯驱动程序,制定符合can2 . 0a的模块通讯协议和模块驱动程序。
The paper introduces the studies and the development of an intellective soilless culture system on mixing and irrigating . the system is closed - circuited and its main controlling parameters are consistence value and acidity value of the nutrient liquid . the system includes switching circuit , analogue input and output circuit , digital integrated circuit , keyboard display circuit , driving circuit , execution mechanism etc . by its modular design the system can automatic mix the nutrient liquid and irrigate 本论文研究内容是智能温室营养液配液及供液控制系统的研究与开发，该控制系统是以养液浓度和酸度为主要调控参数的闭环控制系统，主要包括开关量输入/输出电路、模拟量输入电路、液晶电路、键盘显示接口电路、设备驱动电路和执行机构等。
