conversion characteristics and plc analog io modules between

plc analog io modules suitable for connecting analog sensors and actuators. 

plc analog io modules features: 

4 inputs, 2 outputs 

6ES7 334-smart plc analog input (4 RTD) / analog output (2-way) 

communication module plc 334-0CE01-0AA0 analog input (4) / analog outputs (2-way) 

Analog input / output modules convert: 

The conversion of analog signals to digital values ​​required PLC 

The PLC of the process of converting the digital signal to analog signals required.

Advantages plc analog output module Where

The advantage of using plc analog output module Where
 Release There are many different power modules plc analog output module on the market, with different product input voltage, output power, function, and so on different topologies. Using the power module can save development time and make products to market faster, and  plc digital input module therefore the power module integrated solutions than winning. Multiple power module has the following advantages: 1, respectively, each module can be rigorously tested to ensure that it is highly reliable, including power-on test to eliminate substandard products. In contrast, the integrated solution will be more difficult to test, because the entire power supply system and other functional systems closely together on the circuit.
2 plc analog output module vendors can plc analog output module  design different sizes of the same module in accordance with the existing technical standards for the design of the power supply engineers with a variety of different options.
3 plc analog output module design and testing of each module are carried out in accordance with the performance standards, will help reduce the use of new technologies to bear risk.
4 If using an integrated solution once the power supply system problems, we need to replace the entire motherboard; If using  plc power module a modular design, as long as the problem can replace the module, it will also help save cost and development time.

plc analog input modules basic knowledge sharing

plc analog input modules can be mounted directly on a printed circuit board power supply, which is characterized by specific integrated circuit (ASIC), digital signal processors (DSP), a microprocessor, a memory, a field programmable gate array (FPGA) and other digital or analog load to provide power. Generally, this type of module called load point (POL) power supply systems or use special point of power supply system (PUPS). Because of the many advantages of modular structure, so the module power is widely used  plc analog output module to exchange communications equipment, access equipment, mobile communications, microwave communications and optical transmission, routers and automotive electronics, aerospace and so on. Especially in recent years due to the continuous promotion of the rapid development of data services and distributed power supply system, an increase plc analog input modules have a power beyond. With the extensive use of semiconductor technology, packaging technology and high-frequency soft switching, power supply module power density increases, more and more high conversion efficiency, applications are increasingly simple.
plc analog input modules in switching power supply technology in the field of people are related to the development of power electronic devices side, while the development of the switching frequency technology, the two promote each other to promote the switching power supply to more than two-digit annual growth rates toward the light, small, thin, low noise , high reliability, interference direction. Switching power supply can be divided into AC / DC and DC / DC two categories, DC / DC converters are now modular and design techniques and manufacturing processes are mature and standardized at home and abroad, and has been recognized by users, but AC / DC modular, makes  plc high-speed counting module its own characteristics in the modular process, encountered more complex technology and manufacturing process problems. plc analog input modules, respectively, the following two types of switching power supplies for the structure and characteristics in order to elaborate
DC / DC converter is a fixed DC voltage into a variable DC voltage, also known as a DC chopper. Chopper work in two ways, first pulse width modulation Ts constant change ton (GM), the second is the frequency modulation (1) Buck circuit - Buck chopper, the average voltage output
U0 is smaller than the input voltage Ui, the same polarity. 2) Boost Circuit - boost chopper, the output voltage U0 is greater  Programmable Input Module than the average input voltage Ui, the same polarity (3) Buck-Boost circuit - buck or boost chopper output voltage U0 is greater than or less than the average the input voltage Ui, the opposite polarity, the inductor transmission (4) Cuk circuit - buck or boost chopper, the average output voltage is greater than or less than the input voltage U0 Ui, of opposite polarity, capacitance of the transmission. There Sepic, Zeta circuits. The above non-isolated circuit, the circuit has a forward isolated circuits, flyback, half-bridge circuit, full bridge circuit, push-pull circuit.

Major developments plc analog input modules

With the development of science and technology, the reliability of a redundant PLC system has been further improved, the current PLC redundancy can be divided into hardware redundancy and software redundancy in two ways, hardware redundancy connection differently, but also requires that the corresponding hardware model, but no special software is required. Because of the higher hardware redundancy with high reliability, but also higher cost to build the system. And software redundancy is a low cost solution while also greatly  plc cpu module improved the reliability of space applications, plc analog input modules can be widely used in metallurgy, transportation, electricity, chemicals, sewage treatment, etc., but the system still needs to be Research. Here's a brief introduction to the way these two redundant PLC system.
Software redundancy principle is that when the process of the realization of the two CPU while the system is running up and running, but in normal operation only the main CPU to issue control commands, and the standby CPU to detect and record the main CPU status issued by the main CPU command, plc analog input When the main CPU modules can be sustained at the time  plc analog output module of the failure of the state to take over the main CPU to issue actually execute the command. When specific fault occurs, the system can achieve standby switch, standby master station continues to run to succeed.
Hardware redundancy redundant system to ensure reliability of the system, such as all the major components are redundant configurations, including a redundant CPU, power supply module and the synchronization module for redundant CPU communication. Customers can also be configured accordingly redundant servers, redundant interface module, redundant communications media, etc. according to specific needs. Under normal circumstances high-speed counter modules  hardware redundancy system can achieve the following functions.
A positioning error detection and error integration.
2 automatic event synchronization with smooth master-slave switch.
3 is similar to a standard CPU-line programming.
4 can be modified during operation of the system or components to be replaced.
5 Download the program when considering only a single CPU, the program can automatically copied to another CPU, and the automatic re-enter after the repair.

plc analog io modules management techniques

Reduce the demand for efficient power people and the size of electronic products, promote the development of digital power technology and power management technology. Modern power management semiconductors have been more associated with the power switch control circuit protection and integrated, plc analog io modules to reduce power management devices in the  digital input plc circuit board footprint and achieve the protection, control and fault monitoring functions combinations. Evolving the same time, digital power management ICs satisfied only detected voltage, current, temperature and other parameters, and gradually developed into an integrated digital PWM control, ADC and communication functions, and is moving towards becoming a complete power system on chip direction .
A digital plc analog io modules and  output module plc application management technology introduction
Generation IC requires 3.3 V, 1.8 V or lower supply voltage, the device requires multiple single voltage supply and the demand for a large electric current, the voltage must be applied to the device with the correct timing. Voltage power supply for these devices must be on the circuit board (preferably from these devices near the place) to produce, so that a minimum pressure drop and voltage stability. High-performance DC / DC converters for a wide range of input, either as isolated power, but also as a non-isolated point of load converters. Thus, most board power supply system has been high-speed counter plc  used DC / DC converter as a power supply module body. However, if the lack of power management circuits, you can not build a complete, robust power system. Content includes power management: Power system monitoring, sequencing and tracking, monitoring and fail-safe. Power management devices at the input common-mode rejection handling, start limit, starting and control off, and even power factor correction and other functions. Configuration at the output of the power management device control startup sequencing and output voltage regulation, and for the over-voltage, over-current conditions fail to provide appropriate protection. All relevant requirements and functional circuits are isolated from the main circuit.

plc analog input modules functional parameter index and test methods

Electrical performance of the power module is presented through a series of tests , the following general functional test project , as detailed below :
First, the definition of the power supply regulation regulation of its ability to provide a stable output voltage when the input power supply voltage variations. Test procedure is as follows : the power supply in the test engine after heat stable under normal input voltage and load conditions , respectively, in a low input voltage (Min), the normal input voltage (Normal), and high input voltage (Max) and record the measured The output voltage value. Power adjustment rate is usually fixed to a normal load (Nominal Load) , the percentage change caused by the input voltage output voltage deviation  micro smart plc (deviation) , as shown in the following formula : Define two , load regulation Load regulation is switching power supply when the output load current changes, its ability to provide a stable output voltage . Test procedure is as follows : plc analog input modules in the power supply to the test input voltage under normal load conditions and the stability of the heat engine , the measured value of the normal output voltage under load , and then were light load (Min), overload (Max) Load Next , measure and record the output voltage value ( respectively Vo (max) and Vo (min)), load regulation is usually normal fixed input voltage, load current changes caused by the output voltage deviation rate percentage , as the following equation: Third , the definition of a comprehensive regulation for the comprehensive regulation of the power supply to the input voltage and output load current changes, its ability to provide a stable output voltage . This is a comprehensive line regulation and load regulation , and this test system for the synthesis power regulation and load regulation , which provides for the power supply to changes in input voltage and load conditions more accurate performance verification . Comprehensive regulation in  industrial automation plc the following ways: on input voltage and output load current changes , the output voltage deviation shall be within the range specified above the lower voltage ( ie, less than the absolute value of the output voltage above the lower limit ) or as a percentage of the boundaries four , plc analog input modules output noise output noise (PARD) refers to the input voltage and output load current are constant , periodic and random deviation of the average DC output voltage of the voltage. Output noise is after all the unwanted part exchanges and noise on the regulator and filtered DC output voltage ( 50/60Hz power frequency signal containing the low-frequency , high frequency above 20 KHz switching signal and its harmonic wave, and then the other of the  plc analog io module composition and the random signal ) ) , usually mVp-p is a peak-to -peak voltage is expressed in units . General specifications are output switching power supply DC output voltage of less than 1% of output noise specification , the bandwidth of 20Hz to 20MHz. The actual work when the power is the worst situation ( such as maximum output load current , input supply voltage minimum , etc. )

plc analog output modules in the AC / DC conversion simple analysis

AC / DC conversion is to convert AC to DC , the power flow may be bidirectional power flow from the power source to the load is called a " rectifier " power flow from the load to return the power referred to as " active inverter ." AC / DC converter input is AC 50/60Hz , because to be  industrial automation plc rectified , filtered , and therefore relatively large size of the filter capacitor is essential, because while experiencing safety standards (such as UL, CCEE , etc. ) and EMC Directive restrictions ( such as IEC,, FCC, CSA), AC input side EMC filter must be added to meet safety standards and the use of components , thus limiting AC / DC power supply volume of miniaturization, in addition , due to the internal high-frequency , high-voltage , large plc module  current switching action, making solve EMC problems more difficult , plc analog output modules also installed on the internal high -density circuit design made ​​high demands, for the same reason , high voltage, high current switching power supply makes the job losses increase large , plc analog output modules limits the AC / DC converter modular process, and therefore must be used to optimize power system design approach to make it work efficiently to achieve a certain level of satisfaction .
AC / DC conversion circuit according to the  plc programmable intelligent controller connection method can be divided into half-wave circuit, a full-wave circuit . Press the power phases can be divided into single-phase , three-phase , multi-phase . Operation of the circuit can be divided into quadrants by a quadrant , two quadrant , three quadrants, four quadrants.