Hollysys PLC application in intelligent building energy acquisition system

Hollysys PLC application in the intelligent building energy acquisition system newmaker welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC programming cable. 。 。 Pick to: intelligent electric meter is indispensable equipment in the electric power monitoring, it can be a three-phase power test and display, the accumulation of energy, power quality analysis, fault alarm, collection and digital input, output, and the network at a suit, in order to realize remote data acquisition and control. Electric power monitoring and control system for the distribution network is particularly important. The electric power monitoring and control system based on LM hollysys company PLC, can be achieved through the way of communication for all the electric power monitoring instrument data collection and set, DP through the network to upload data to LK PLC monitoring stations, again by the LK PLC controller through industrial Ethernet communication, with computer to realize the centralized monitoring and control of all power data. Key words: LM PLC; 路PLC; Smart power meters 1 introduction transformer room as the power centers of intelligent building system, offer the whole building utility equipment and office equipment, lighting, fire protection, the electricity. Intelligent power meter is to measure the whole power supply network, analysis and display of instruments. As a result of the intelligent building power supply network is huge, so the use of smart power meters more. This requires a reliable monitoring system and all of the intelligent instrument for data exchange, realize to monitor the whole distribution network, so as to realize the fault alarm and optimize the management of electric power. Use of hollysys LK series and LM series PLC power acquisition system because of its high reliability, free communication flexible and large amount of data communication and communication programming is adopted. Electricity acquisition system is realized with electric power meter in each data acquisition function, data including frequency, phase voltage and line voltage, phase ( Line) Current, active/reactive power, apparent power, power factor (pf), absolute power and absolute degree of reactive power, etc. The LM series PLC using free port communication with all of the intelligent electric instrument for communication, and implement of instrument of data storage and upload. LK series PLC controller to complete for all LM series PLC in the instrument data statistics and summary, finally through Ethernet to transfer data to the upper monitor computer, realize the entire supply system status monitoring. 2 system design power acquisition system generally by LK and LM series PLC as the core communications cabinets. System unit as shown. Power monitoring ark have 1 set of LK series PLC configuration, 10 sets of LM series PLC and the power supply. Each LM series PLC has a RS485 interface and a PROFIBUS - DP interface, through the RS485 serial communication with intelligent instruments, through PROFIBUS - again DP bus will read up data transmission in LK series PLC. LK series PLC through Ethernet communication will be aggregated distribution indoor all data transmitted to upper monitor computer. Because of the need to collect meter quantity many, and each of the meter reading data, so the more than LM series PLC connected to the instrument for data collection. LM series PLC of RS232 and RS485 serial port with free port communication function, can free programming for instrument support agreement, parameter setting and change is very convenient, in the instrument support of MODBUS RTU protocol for the main programming. LK series PLC has 16 m data storage space and supports PROFIBUS - DP and Ethernet ( MODBUS TCP) Communication, can be convenient to connect with LM series PLC and upper computer. The use of LK series PLC summary LM series PLC to read data greatly optimize the network structure. 3 PLC hardware configuration to the production floor power monitoring and control system as an example, the use of PLC equipment is as follows: using PowerPro2 LM series PLC controller. 1. 3 b programming software programming. PowerPro2。 1. 3 b programming software has a very comprehensive function: language standardization program. IL, LD, ST, FBD, SFC, CFC, six kinds of programming languages. Variational internal device. Timer and counter method with variable was adopted in order to realize the infinite point calls. Modular program organization. Convenient for reuse of the program, read and debug, etc. , to ensure the safety program. Parameters set easy. The special function block can be set different parameters to satisfy the use requirement. Programming control integration. With a view and simulation debugging, is very convenient for writing and debugging programs. You can see from the program all of the data acquisition and storage are done by LM series PLC. Sent via RS485 ask frame data, and the data returned by the CRC check judgment, if the data returned is not correct, not for data storage, only to return the data correct data into the corresponding register. LK series PLC will all the instrument data aggregated into continuous register, its 16 m data store can be easily stored under all LM instrument data. Using LK series PLC is mainly the purpose of optimizing the network structure, improve the reliability of the whole system of communication and maintenance simple and easy. 5 conclusion hollysys LM and LK series PLC based power meter data acquisition system, with its strong reliability, the flexibility of data set and rich communication interface realizing the collection of all electric power meter data, make the whole building of electric power system has made full monitoring and management. References [ 1] Help text, Yang jin-wu zheng; New power dedicated instrumentation application manual [ J] 。 Mechanical industry press [ 2] AnSiQun, electrical instrumentation engineering installation and debugging and maintenance technology and practical manual [ J] 。 Beijing HuaQing bookstore [ 3] Ren cheng, weeks; Power electric digital instrument measuring principle and application guide [ M] 。 China electric power press.
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