Đang tải... (xem toàn văn)
Thiết bị và hệ thống tự động
Lecturer Ph.D Truong Dinh Chau, Department of Automatic Control, Faculty of Electrical – Electronics Engineering, HCM. City University of Technology tdchau@hcmut.edu.vn 091. 543-74-40 Industry Automation Outcome 8 Data Acquisition and Control Cards Master boards Remote I/O Modules Converter I/O Expansion Board Embedded Controllers Compact Embedded Controller Communication Controller Embedded controller Embedded controllerEmbedded controller Embedded controller PC-based controller PC-based controller DAC 0x140 ADC 0x142 DAC 0x144 Master Board Channel 0 Channel 1 . Channel 7 . Channel 0 Channel 1 . Channel 31 . Channel 0 Channel 1 . Channel 7 . Process SensorsActuators Actuators PC-based controller Modbus Embedded Controller HMISCADA Modbus Client (Master) Modbus Embedded Controller Run User Process Update I/O Check Modbus Request . . . RS-485 RS-232 PLC Modbus protocol User-defined protocol Ethernet RS-232 RS-485 I/O Expansion Bus X server X server Web server VxComm TCP/IP Application Program Virtual COM Ethernet I/O Rs-232 TCP/IP Web server Application Device Browser ( IE, Netscape) 7188E series I/O expansion module Hub PLC TCP/IP Server Virtual COM Specified Driver OS • Built-In DOS, MiniOS7, Windows XP Embedded, Linux Embedded… MiniOS7 • Files Download and Execution (.exe, .com, .bat) • Use Autoexec.bat • Can’t Run Another Process ( Function system() of C) • Warm Up Time – 0.1 Second for 20 MHz CPU – 0.05 Second for 40 MHz CPU – 0.5 Second for 8k Main Unit MiniOS7 • Files Download and Execution (.exe, .com, .bat) • Use Autoexec.bat • Can’t Run Another Process ( Function system() of C) • Warm Up Time – 0.1 Second for 20 MHz CPU – 0.05 Second for 40 MHz CPU – 0.5 Second for 8k Main Unit C embedded programming PC-based controller Embedded devices Boolean Logic AND A 0 0 1 1 B 0 1 0 1 X 0 0 0 1 X A B ⋅ = OR A 0 0 1 1 B 0 1 0 1 X 0 1 1 1 X A B+= NOT A 0 1 X 1 0 X A= EOR A 0 0 1 1 B 0 1 0 1 X 0 1 1 0 X A B ⊕ = NAND A 0 0 1 1 B 0 1 0 1 X 1 1 1 0 X A B ⋅ = NOR A 0 0 1 1 B 0 1 0 1 X 1 0 0 0 X A B+= A B A B A B A B A B A X X X X X X C ON START STOP ON C A Burglar Alarm Inputs Output S M W A 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 0 0 0 1 0 1 1 A S M W⋅ ⋅( ) S M W⋅ ⋅( ) S M W⋅ ⋅( )+ += A∴ S W⋅( ) S M⋅( )+ S W M+( )⋅= = A∴ S M W⋅ M W⋅ M W⋅+ +( )⋅= A∴ S M W⋅ M W⋅+( ) M W⋅ M W⋅+( )+( )⋅= C C A D A C B D L U Latches C Timer C Design Case Problem: Develop the ladder logic that will turn on an output light, 15 seconds after switch A has been turned on. A TON Preset 15s delay delay.DN Light Solution: C Heating control TON Timer heat Delay 10s TOF Timer cooling Delay 300s Horn Heating C oils Auto heat.TT heat.DN Auto Auto StopStart Fan cooling.DN C Counters CTU A Counter example Preset 4 Accum. 2 (CU) (DN) example.DN example RES X B C Problem: Develop the ladder logic that will turn on a light, after switch A has been closed 10 times. Push button B will reset the counters A CTU Preset 10 Accum. 0 count B count RES count.DN Light Design Case C Master Control Relays A MCR MCR B C L D U X Y Y C Design Case a system that will turn on a light ‘L’ when input ‘A’ has been turned on between 10 and 15 times. Design Case Computer power button.