附件 2 ：外文原文Programmable Controller Designed forElectro-pneumatic SystemsSummary this item is mainly the procedure which studies electricity system and in brief valid control current of air to launch machine to compatibly flow the appearance of system. It of the fulfillment foundation include according to the control procedure of particularly have of the current of air controller, automation design, current of air system and design according to the electronics of the tiny controller.1. Brief introductionThe automation which uses an electricity technique mainly constitutes to. from 3 part: Launch machine or motor, sensor or button, the form is zero partses such as the control of flower petal. Now, greatly part of system logic the controllers of the operation drive all procedure logic controller (PLC) replace. PLC sensor and switchs aring an importation to carry, but launch the direct control valve of machine is an exportation to carry and have an internal procedure to operate among them all circulate essential logic, imitate other devices like calculator, in fixed time machine etc., carry on a control to the whole movement appearance of system.Can according to need numerous time to establish and imitate thus of system, so all from PLC usage, this item contains vivid advantage. Therefore can save time, the danger of decrease error, in the meantime under the sistuation that use same material, it can be getting more precise.Many company that is on the market used the PLC of normal regulations and it can not only control with the current of air system, but also can use various electricity equipments. PLC wide range of application, can be apply in much industry to produce medium, even used for safety and automation of building in.Because of above various characteristic, the PLC provided a lot of resourceses in somely physically appliedly, even include not a resources of control the system and the electricity system was a kind of application like this.For the engineering of automation, the PLC usage is more expensive, particularly is to those small scaled systems.Aim at this kind of circumstances a kind of viable way establish a controller that can provide particular size and function. This kind of controller can create according to the tiny controller.This kind of applies scope according to the tiny controller smaller, the machine that can used for a type perhaps can use to do a be like the com mon PLC is similar and can be wove n a dista nee of controller, so it can pass variable turn of logic procedure to carry on various homework. All of these characteristic basis con crete dema nd of dissimilarity but dissimilarity, con crete of desig n of empirical of dissimilarity but dissimilarity. But the main advantage of this kind of design lie in designing a pers onnel to un dersta nd an own con troller very much, can freely con trol the big baby size of con troller, cha nge it of fun cti on. This means that this item contains more special, but in the mean time the control of system also from it of design control.2. Electricity systemPeople can find out to speak of in three precedi ng con texts from an automatio n of basic parts, the in addition is a logic circuit which controls system. The technique of only mature forerunner cans make a particular logic circuit and performa nee the parts that exactitude n eed whe n operate to get stripe. For a simple sport, the system auto procedure can complete, but for in direct or more complicated sport, the procedure of system will produce complicated circuit and false sig nal. This is n eed ano ther method can save time, produce clear circuit, can keep accide ntal sig nal from hand over fold to stop with circuit.The line roadbed method of differe nt sta ndard of this kind of way call follow the seque nee and advance gradually type or rule system, it to the current of air and the electricity system very valid, and is also a foundation of this item. It include according to launch the system of foundation that the machine appearance each dissimilarity variety establish.I*i! 1 SljDidjrd 11x111( J or ti.L pnjiimJtic 3 skinY.4vnlvfThe square one is each circuit that the step desig ns those kinds of standards. The second step is a conjunction to receive to come from sensor and the switch sends the air or the fax to the supply line ofeach step in the mea ntime with previous sport sig nal. If show in the diagram, 1 with 2 sta ndard circuits is a current of air of with the electricity system serve. We can know very much of see each one step sudde nly with the con tact of the of n ext step.3. The applied prin ciple of con troller inner partThe above-me nti oned method can make each sport of launch the mach ine nicely defi ned with the step. This be also a new appearance which says that the every sport varieties of launch the machines are systems, but the cha nge of of two differe nt appeara nces be called a step.The standard circuit which spe