With the rapid development of computer control technology and the gradual realization of traditional industrial transformation, temperature measurement and control systems composed of microcomputers have been adopted in many fields. However, when the monitoring points of the system are more scattered, the temperature monitor using a single structure is powerless. Although there are many kinds of temperature measuring instruments that are widely used at present, the form of data collected by their input channels is nothing more than two types of analog switches that are small in size, fast in price, and relatively inexpensive; the other is larger in size and faster in speed than the former. Low, the price is more expensive than the former is the isolated input form of the relay. The former is rarely used in the petrochemical metallurgy and other fields of power stations. The reason is that the environment is relatively harsh. As long as the multi-point grounding of the equipment caused by vibration and humidity corrosion occurs, the temperature inspection instrument will be unstable and the reading will be beaten. The smaller the insulation resistance of the grounding point, the greater the impact. In order to make the temperature inspection device have lower cost and can resist the large cross-drying and overcome the shortcomings of the traditional inspection instrument network, the industrial control level embedded microprocessor IMei80C196KC was developed according to the specific conditions of the hydropower station. A multi-point intelligent temperature inspection device for the core hydro-generator unit. The device can focus on the temperature parameters that need to be monitored during the production process of the hydro-generator set, and alarm and complete the networking with the host computer as needed.
The display interface adopts the brother, the company's 37219 display adopts 0 display instrument amplifier adopts the channel switching produced by 83 company adopts digital switch, and adopts, 18, 1 company, 25043 and elbow, 瞧 company's 1232 two-level watchdog The circuit also uses a bath 485 communication interface with light isolation. The structure adopts the module plug-in board mode, and the whole machine consists of the digital switch board relay isolation board main board power supply and signal amplification conversion circuit.
1.1 Measurement input part The temperature channel measured by this device is 32 channels. The input signal is isolated by relay. Two 16-to-1 digital switches 4 are controlled by two-stage control of 8,196 doors to realize the analog signal of any channel. In order to ensure the measurement accuracy, the zero drift of the acquisition signal is specially processed. The measurement signal is sent to the amplifying circuit for amplification and then sent to the embedded microprocessor system. The intelligent temperature inspection device with the bit D 1 hardware in the film is designed with the 800196 embedded microprocessor as the core, Z, ifa ignorance Cf0 , 鲴 擂篦 擂篦 eT even water turbine generator set multi-channel intelligent temperature inspection device Wang Deyi Wang Tao Nan Haipeng Li Yang Xi'an University of Technology School of Hydropower Xi'an City 0048 out of the 180019610 embedded microprocessor as the core of the hydroelectric power generation The unit multi-channel intelligent temperature inspection device. The device has the advantages of strong anti-interference ability, high measurement accuracy, convenient system display, convenient power-down data protection, and convenient operation.
The digital switch display keyboard signal amplification conversion motherboard relay isolation board can get the temperature value of this point. The sampling period of the channel can be level or grading according to the need to manually set the input wiring. The wiring meaning 250 and the decay 100 are copper resistance platinum resistance temperature measuring components, which are directly installed in the measuring part of the hydroelectric generating set; the wire resistance is the condition 1. The wire calibration resistance is the condition 2.
Thermoelectric calibration potentiometer temperature measuring device input circuit 1.2 communication part This device uses the 485 serial communication interface with optical isolation, and uses data. Only 0 check technology to ensure the reliability of communication. The hardware structure 3, when a temperature monitoring system is composed of a plurality of temperature measuring devices, can form a communication network of the upper and lower machines.
Its network system consists of 4.
1 Start through 1 hole 1 data protection, except to see the communication protocol between 1 dog position machine and temperature measuring device according to the following rules: 1 upper computer is the master station, the lower measuring device is the slave station, and the protocol adopts master-slave mode. That is, the reading signal and the device site are sent by the upper computer to the lower temperature measuring device. The station address corresponds to the upper machine to send the measurement; data. The site of the temperature measuring device 1 can be selected. However, the addresses of the four devices should be different. After the temperature measuring device receives the data person, if a device has a series of data sent by the host computer.
2 software design intelligent temperature inspection device software consists of the main program interrupt service program application, the main program flow 5.
After the inspection device is powered on, it enters the initial state. The system should dynamically scan the composition of the embedded microprocessor digital tube, and the scan ends to transfer to the communication program, and then judge whether there is a key press. First determine whether it is a function key, or a function key to perform the corresponding function. otherwise. Perform temperature inspection data protection and clean the watchdog.
3 The characteristics of the intelligent temperature inspection device, and the use of relay isolation digital switch control and data verification and other soft. Hardware protection circuit. The reliability of the device operation is improved while ensuring the measurement accuracy.
2 Each channel can independently set the upper limit and upper limit alarm value. The alarm status is displayed by the digital tube. It also has relay alarm output and over-limit alarm memory function.
3 input signal types are, 00 uranium resistance or 0 copper resistance. It can be set to one of them according to user requirements. 4 It can be set to 132 channel measurement by keyboard according to requirements. 5 Non-volatile memory is used for power-down protection, and parameters can be stored reliably for a long time.
6 With the tour detection and fixed point detection switching function, the tour display time can be set.
7 has a light independent batch 485 serial communication interface. It can form a monitoring network with the host computer.
4 Conclusion Multi-channel intelligent temperature inspection device uses relay isolation. The serial communication isolation protection circuit and data verification technology have strong anti-interference ability, and the hydroelectric generator set temperature monitoring is carried out on many hydropower stations such as Xuelongtan Dagangou and Shaanxi Yangling. The actual operation results are clear. The device is stable and reliable, with high measurement accuracy and wide measuring range. It can correctly detect the temperature exceeding the limit and complete the required tasks.
Greatly increased labor productivity. Has the value of promotion and application. â–¡1 Li Wenjing, Niudou, et al. Design of a new distributed temperature inspection system. Electronics and automatic it.199942 Zhang Tao. Jiang Yinping. Wait. Intelligent, reliable design of research automation 1999 3 Zhou Jiang. Jin Huimin. Wait. Applicable to intelligent, serial bus MCU application system + electric ftjiA author profile Wang Deyi. male. 39 years old. Associate Professor Received Date 2001
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