英语翻译2系统结构原理?电梯系统结构原理如图2—1所示.电力拖动部分主要由变频器、电机、减速机及旋转编码器等装置组成.变

2 system architecture principles 
Elevator system of principles as shown in Figure 2-1.Some of the main drag from the power inverter,motor,reducer and rotary encoders and other devices component.Converter to receive the controller from the engine room control signals,and rotation of the encoder feedback signal pulse with a variable frequency location of the closed-loop speed control,traction motor-driven elevator car smooth and accurate operation berth.Signal control of the main controller has three kinds:the engine room controller,controller of the station,Car Controller,from the system schematic structure of the controller can be seen from the main distinction,in the same way and bus connections are For the bus link on the node.Each node can send real-time signal to the bus,and receive signals on the bus.Thus achieving called staircase and display of serial communication signals.
3 node controller design 
Based on more than CAN bus main structure,three kinds of bus controller as the control nodes,send and receive signals in a similar way,the choice of the same microcontroller and bus transceiver,according to the number of control signals and different types of Interface Circuit increase or decrease accordingly,a structure similar to the controller.Below the Cabin controller node controller as an example of the hardware design,circuit schematic as shown in Figure 3-1.
Bus controllers and transceivers were used Philips company P8XC592 and PCA82C250.P8XC592 COMS manufacturing process is the function of the CAN 8-bit microcontrollers,and 80 C51 instruction set is fully compatible with.PCA82C250 is CAN controller and the physical bus interface,the bus can provide the differential transmit and receive functions,to the rate of 1 Mbps to work in poor electrical environment.CAN bus by the physical layer protocol,a twisted pair wiring.P8XC592 and PCA82C250,and PCA82C250 and bus links are interconnected through two serial port.P8XC592 the P1  6 / CTX0 for CAN transmitter output 0,CRX0 and CRX1 for CAN bus controller differential input to the input of the comparator,respectively,and PCA82C250 the TXD (send data input),RXD (receive data output End),Vref (reference voltage output) connected.P8XC592 the mouth of the P0 latch 74 LS373 received two 8255 expansion of mouth,8255 (1) of the PA,PB,PC a total of 24 ports were receiving Cabin 24,the election signals a press any button,or through the door Have a negative pulse by the INT0 I P8XC592 formed external interrupt,after P8XC592 call interrupt service procedures were read 24-port signal.When the lift-station a few more than 24,just two more to 8255 to control the number of stations to 48.P8XC592 signal through the serial port P1.6/CTX0 reached the end PCA82C250 the TXD; P2  6 P2  7口output signal the direction for the indicator light lit up and down; P2.0 P2.5 next two Translation Code drive MC14495 monitors connected with the Qiduan code to show a few floors.8255 (2) of the PA,PB,PC a total of 24 ports were registered memory output signal,for the corresponding lit in memory indicator election.Room controller timing and direction of the station sent signals,and registered memory signal controller is the engine room received calls staircase signal,sent immediately to the bus.