【文章內(nèi)容簡(jiǎn)介】 reface, we will arrive wrapping information feedback to examine the place, and examine the information of the place to also want the feedback to packing. Pass the information share thus to make both the chain connect, beconling a total body, the match of your that thus make is more close, at each other attain to reflect the result that mutually flick. The PLC conespondence has aheady e more more body now its wllue, at the PLC and correspondence between PLCs, can pass the munication of the information and tile share of the datas to guarantee that of the equipments moderates mutually, the result that arrive already to repair with each other. Data conversion the adoption RS232 between PLC connect to e to the transmission data, but the RS232 pick up a people and can guarantee 10 meters only of deliver the distance, if in the distance of 1000 meters we can pass the RS485 to carry on the correspondence,the longer distance can pass the MODEL only to carry on deliver. The PLC data transmission is just to be called a fornl to it in a piece of and continuous address that the data of the inner part delivers the other party, we, the PLC of the other pal~y passes to read data in the watch to carry on the operation. If the data that data in the watch is a to establish generally, that is just the general data transmission, for example today of oil price rise, I want to deliver the price of the oil price to lose the oil ally on board, that is the share of the data。 But take data in the watch for an instruction procedure that controls the PLC, that had the difficulty very much, for example you have to control one pedestal robot to press the action work that you imagine, you will draw up for it the form that a procedure bine with the data sends out to pass by. The form thai information transport contain single work, the half a work and the difference of a workses .The meaning of the single work also is to say both, a can send out only, but a can receive only, for example a spy he can receive the designation of the superior only, but can39。t give the superior reply。 A work of half is also 2 and can can send out similar to accept the data, but can39。t send out and accept at the same time,for example when you make a phone call is to can39。t answer the phone, the other party also。 But whole pair works is both can send out and accept the data, and can send out and accept at the same time. Be like the Inter is a typical example. The process that information transport also has synchronous and different step cent: The data line and the clock lines are synchronous when synchronous meaning liein sending out the data. is also the data signal and the clock signals to be carry on by the CPU to send out at the same time, this needs to all want the specialized clock signal each other to carry on the 中原工學(xué)院信息商務(wù)學(xué)院外文翻譯 6 transmission and connect to send, and is constrained, the characteristics of this kind of method lies in its speed very quick, but correspond work time of take up the CPU and also want to be long oppositely, at the same time the technique difficulty also very big. Its request lies is can not have an error margins in a darns deliver, otherwise the whole piece according to pare the occurrence mistake, this on the hardware is a bigger difficulty. Applied more and more extensive in some appropriative equipmentses, be like the appropriative medical treatment equipments, the numerical signal equipments...etc., in pare And the different step is an application tile most extensive, this receive benefit in it of technique difficulty is opposite and want to be small, at the same time not need to prepare the specialized clock signal, its characteristics to lie in, its data is partition, the longlost send out and accept, be the CPU is too busy of time can grind to a stop sex to work, also reduced the difficulty on the hardware, the data throw to lose at the same time opposite want to be little, we can pass the examination of the data to observe whether the data that we send out has the mistake or not, be like strange accidentally the method, tired addition and eight efficacies method etc., can use to helps whether the data that we examine to send oat have or not the inistake occunence, pass the feedback to carry on the discriminator. A line of transmission of the information contain a string of and bine the cent of: The usual PLC is 8 machines, certainly also having 16 machines. We can be an at the time of sending out the data a send out to the other party, also can be 88 send out lhe daia to the oiher party, an and 8 differeniiationses are also the as that we say to send out the data and bine sends out the data. A speed is more and slowly, but as long as 2 or three lines can solve problem, and Call use tile telephone line to carry on the long range control. But bine the oscular transmission speed is very quick of, it is a string of oscular of 25600%, occupy the advantage in the short distance, the inview of the fact TTL electricity is even, being limited by the scope of one meter generally, it bine unwell used for the data transmission of the long pull, thus the cost is too expensive. Under a lot of circumstances we are total to like to adopt the string to bihe conversion chip to carry on deliver, under this kind of circumstance not need us to carry on to depositted the machine to establish too and plicatedly, but carry on the data exchanges through the data transmission instruction directly, but is not a very viable way in the correspondence, because the PEC of the other party must has been wait for your data exportation at the time of sending out the data, it can39。t do other works. When you are reading the book, you hear someone knock on