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introduction：Programmable controllerIt is widely used in steel at home and abroad、petrification、Machine building、Automobile assembly、electricity、Light textile、Electronic information industry and other industries。A programmable controller is an electronic system for digital arithmetic，Designed for use in industrial environments。It uses programmable memory，Used to perform logical operations in internal storage、Sequential control、timing、Instructions for counting and arithmetic operations，And by digital、Analog inputs and outputs。Schneider Electric launches the worlds first general purpose automation platformQuantum，It is a large control system with powerful processing power，An economical and flexible hardware control platform that can meet most discrete and process controls。SelectPLC，There are two general requirements：Start by knowing how many input/output points your project will use。The second thing to know is what kind of function does the project want to achieve，Pulse output，The output terminal must be a crystal light ou
2017-07-12 Reading quantity 213
introduction：PLCMicroelectronic technology is used to complete various control functions，Under the action of the input signal in the field，Follow the pre-entered program，Control the execution mechanism of the site，Perform the action according to certain rules。Its main functions are as follows。 Sequential logic control： This isPLCThe most basic and most widely used fields，Used to replace relay control systems，Realize logic control and sequence control。It can be used for single-machine control or multi-machine control and can be used for automatic production line control。PLCAccording to operation button、Limit switch and other command signals given on site，Control the mechanical moving parts to operate accordingly[5] 。 Motion control： In the machining industry，Programmable controllerAnd computer numerical control（CNC）Integrate together，Complete machine motion control。A good manyPLCManufacturers have provided single-axis or multi-axis position control templates for driving stepper or servo motors。In most cases，PLCSend
2017-07-13 Reading quantity 301
introduction：Early programmable controllersIts called a programmable logic controller(Programmable Logic Controller)，For shortPLC，It is mainly used to replace the relay to achieve logic control。With the development of technology，The function of this device has greatly exceeded the scope of logical control，therefore，Today such devices are called programmable controllers，For shortPC。But to avoid it with a personal computer(Personal Computer)Short for confusion，So the programmable controller for shortPLC。 What is the definition： Programmable controller for shortPC（Full English name：Programmable Controller），It goes through a programmable matrix controllerPMC、Programmable sequence controllerPSC、Programmable logic controllerPLC（Full English name：Programmable Logic Controller）And programmable controllerPCSeveral different periods。For the personal computer（PC）distinguish，It still uses the old name programmable logic controller。 1987International Electrotechnical Commission（International Electrical Committee）enunciablePLC
2017-07-14 Reading quantity 379
introduction：Siemens（SIEMENS）Company production of programmable controllerIt is widely used in our country，In metallurgy、Chemical engineering、Printing production lines and other fields have applications。Siemens（SIEMENS）corporatePLCProducts includeLOGO、S7-200、S7-1200、S7-300、S7-400Etc.。 SiemensS7seriesPLCSmall size、Fast speed、standardization，Have network communication ability，More functional，High reliability。S7seriesPLCProducts can be divided into miniaturePLC（Such asS7-200），Small-scale performance requirementsPLC（Such asS7-300）Regulating the middle area、high-performancePLC（Such asS7-400）Etc.。 Programmable controller is produced by the need of modern production，The classification of programmable controller must also meet the needs of modern production。 In general, programmable controllers can be classified from three perspectives。One is to classify the control scale of the programmable controller，The second is to classify the performance of the programmable controller，The third is to classify the structure characte
2017-07-14 Reading quantity 314
introduction：The introduction of programmable controller Early programmable controllers were called programmable logic controllers(Programmable Logic Controller)，For shortPLC，It is mainly used to replace the relay to achieve logic control。With the development of technology，The function of this device has greatly exceeded the scope of logical control，therefore，Today such devices are called programmable controllers，For shortPC。But to avoid it with a personal computer(Personal Computer)Short for confusion，So the programmable controller for shortPLC Programmable controller for shortPC（Full English name：Programmable Controller），It goes through a programmable matrix controllerPMC、Programmable sequence controllerPSC、Programmable logic controllerPLC（Full English name：Programmable Logic Controller）And programmable controllerPCSeveral different periods。For the personal computer（PC）distinguish，It still uses the old name programmable logic controller。 1987International Electrotechnical Commission（International Electrical
2017-07-14 Reading quantity 347
introduction：Programmable controller（Programmble Controller）For shortPCorPLCIt is an electronic system for numerical operation，Specifically designed for use in industrial environments。It uses a memory that can be programmed，Used to store logical operations and sequence control during execution、timing、Instructions for counting and arithmetic operations，And through digital or analog input(I)Sum output(O)port，Control various types of machinery or production processes。Programmable controller is developed on the basis of electrical control technology and computer technology，And gradually developed into a microprocessor as the core，Automation technology、Computer technology、New industrial control device integrated with communication technology。At present，PLCIt has been widely used in the automatic control of various production machinery and production process，Become one of the most important、The most popular、The most widely used industrial control devices，It is recognized as the three pillars of modern industrial automation（PLC
2017-07-17 Reading quantity 278
introduction：Classification and use of current relays Slave structure type，Current relay<span style=fo...
2016-03-14 Reading quantity 1683
introduction：LL—12/5Calculation of protection setting value of overcurrent relay。 （1）Current velocity break protection（Should avoid the starting current of the motor or the output current of the motor when the external short circuit） Idzj=Kk x kjx ×【（Kq×Ied）÷N1】 Kk：Reliability factor1.8—2.0 KJN：Coefficient of connection1.0 Kq：Multiple of motor starting current。：icdRated current of motor（A） N1:Current transformer ratio。 (2) Overload protection（The rated current of the motor should be avoided） Idz.j=Kk×Kjx×【Ied÷（Kh×N1）】 Kk：Reliability factor，Action is taken at trip1.2。： KhRelay return coefficient take0.85。 kxj、ied、n1:Take the same value（１） The action time limit of the protective device is in practical application，The action time limit can be pressed to double the action current，Only overload time is allowed，Characteristic curve in relay Online search10The operating time when the operating current is doubledTjnCan be calculated according to the following formula： tgK=150÷｛【（2×Idz.j×N1）÷（Kjx×Ied）】2 －1｝ Calculation ex
2017-02-08 Reading quantity 330
introduction：（one）、Circuit specification： The circuit is made of3Individual relay composition，itsJ0Is the basic circuit component，It suffersplcOutput control of，Its normally open contact controls the on-off of the solenoid valve。Consider that the relay contact is easy to stick and the coil short circuit will cause loss of control and cause accidents，Increase byJ1、J2Two relays and resistors capacitance and other components，The contact is composed of the local relay、A protective circuit that breaks off immediately when the coil shorts，The circuit in the dotted green box in the figure is the main circuit，The remaining part is the relay contact adhesion or the solenoid valve coil short-circuit protection circuit。 circuitalJ0、J1The working voltage of the relay is12V，Its coil resistance value=Ro。J2Operating voltage=24V。J0spliceR1（Resistance value=Ro），reconcatenationR3（Resistance value=Ro/2），Attach toQ1.0Output end，Therefore appropriateQ1.0=1（+24V）whenJ0voltage=12V。DW1Pressure regulator and6VPilot lampZ3After series，withR3In par
2017-02-10 Reading quantity 334
introduction：This article describes the differences between stepper motors and AC servo motors. Performance comparison between stepper motor and AC servo motor Stepper motor is a discrete motion device，it And modern digital control technology has an essential connection。In the current domestic digital control system，Stepper motor is widely used。With the advent of full digital AC servo system，Ac servo motors are also increasingly used in digital control systems。In order to adapt to the development trend of digital control，Motion control system...
2016-02-02 Reading quantity 1729
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