Abstract: It is incredible how many programmable logic controls (PLCs) around us make our modern life possible and pleasant.Machines in our homes heat and cool our air and water, as well as preserve and cook our food. This tutorial explains the importanceof PLCs, and describes how to choose component parts using the parametric tools on the Maxim's website.A similar version of this article was published February 29, 2012 in John Day's Automotive Electronic News.
上传时间： 2013-11-10
上传用户：liaocs77
Abstract: Using a DAC and a microprocessor supervisor, the system safety can be improved in industrial controllers, programmablelogiccontrollers (PLC), and data-acquisition systems. The analog output is set to zero-scale (or pin-programmable midscale) when amicroprocessor failure, optocoupler failure, or undervoltage condition occurs. A simple application is shown on how to implement thisfunction.
上传时间： 2013-10-17
上传用户：sjb555
PLC 控制系统最初被应用于对离散量的控制,随着技术的发展和实际工程应用的需求,PLC 控制系统也开始用于对连续变量的控制。结合实际工程,对PID 模块指令在Allen2Bradley 公司的PLC 产品中的应用,进 行阐述说明。
上传时间： 2013-10-18
上传用户：小宝爱考拉
本次在线座谈主要介绍TI的高精度Delta-Sigma A/D转换器的原理及其应用，Delta-Sigma A/D转换器在称重仪器中，大量采用比例测量方法。
标签： Delta-Sigma 高精度 转换器
上传时间： 2013-10-17
上传用户：zhqzal1014
Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains constant) for eachincrease in the input code. the converse is true for decreasing codes.
标签： Converters Defini DAC
上传时间： 2013-10-30
上传用户：stvnash
ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
上传时间： 2013-11-12
上传用户：pans0ul
cv181l-a-20
标签： Specification_V 181 1.0 L-A
上传时间： 2013-11-14
上传用户：daijun20803
设计了一种以FX3U系列PLC为控制核心的太阳能自动跟踪控制系统。该跟踪控制系统将视日运动轨迹跟踪与传感器跟踪相结合，即第一级采用视日运动轨迹跟踪，初步跟踪太阳的运行轨迹，第二级采用传感器跟踪校正，并采用双轴式跟踪调整装置。系统还设计了时间显示模块，能够显示实时时间，同时也可以对时间进行实时调整。
上传时间： 2013-12-30
上传用户：hz07104032
2012TI杯陕西赛题H题,2012TI杯陕西赛题-A微弱信号检测装置.
上传时间： 2013-12-17
上传用户：362279997
2011全国大赛A题开关电源模块并联供电系统
上传时间： 2013-11-10
上传用户：冇尾飞铊
