tailieunhanh - Programmable Logic Controller plant through MMI Part 12

Tham khảo tài liệu 'programmable logic controller plant through mmi part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 136 Programmable Logic Controller Fig. 5. System Architecture The outgoing supplies are protected by fuses which have to be replaced if fault occurs. In this research project fuses have been replaced by CB which can be manually or automatically controlled for switching operation and are not frequently replaced which is shown in Fig. 7. The panel in Fig. 6 is using power factor meter kilowatt hour meter and three ammeters to provide reading of power factor kilowatt hour and three phase current values. Instead of using different types of meters to provide the reading a single power analyzer is used in this research to provide the same reading and is able to send the data to the controller using modbus protocol. 137 Development of Customized Distribution Automation System DAS for Secure Fault Isolation in Low Voltage Distribution System Fig. 6. Substation Installed By Schneider 5. HMI screen architecture In the user interface starts with login screen. The default user name is Guest . The user needs to login before being able to use the toolbar described in . The current user name will be displayed at the top right of the screen. In Fig. 8 the control screen consists of main screen customer service substation screen and service substation screen. These screens give flexibility on the operation personnel and also to assign authorization so that only the authorized personnel are being able to view the screen. The control screen can be divided into three sections which are the footer header and body section. This is shown in Fig. 9. 138 Programmable Logic Controller Fig. 7. Schematic Diagram of Service Substation Login Screen eve graphsei ection .set graph_A1 .SCI graph_V1 .SCI tab_A1 .SCI tab_V1 .SCI tab use I .SCI use I Fig. 8. Screen Architecture The header section consists of toolbar date and time