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20-750-2262C-2R
20-750-2262C-2R
产品价格:
上架日期:2022-06-21 09:55:37
产地:本地
发货地:本地至全国
供应数量:不限
最少起订:1台
浏览量:306
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    销售产品:进口DCS、PLC控制系统备品备件和大型进口系统模块备件公司

    1.Allen-Bradley(美国AB)系列产品》

    2.Schneider(施耐德电气)系列产品》

    3.General electric(通用电气)系列产品》

    4.Westinghouse(美国西屋)系列产品》

    5.SIEMENS(西门子系列产品)》

    6.销售ABB Robots. FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、Panasonic、Robots、MOTOMAN Robots。

    7.estinghouse(西屋): OVATION系统、WDPF系统、MAX1000系统备件。

    8.Invensys Foxboro(福克斯波罗):I/A Series系统,FBM(现场输入/输出模块)顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数据通信及处理等。Invensys Triconex: 冗余容错控制系统、基于三重模件冗余(TMR)结构的zui现代化的容错控制器。

    9.Siemens(西门子):Siemens MOORE, Siemens Simatic C1,Siemens数控系统等。

    10.Bosch Rexroth(博世力士乐):Indramat,I/O模块,PLC控制器,驱动模块等。

    ◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。采购美国、德国、法国、意大利等欧盟工控产品、备品备件

    very large, and the products with obvious price advantages (mainly refer to centrifugal blowers and general-purpose centrifugal and axial compressors), and high-tech industries and newly developed high-tech products (mainly refers to centrifugal compressors for ethylene plants with a capacity of more than 600000 tons, natural gas pipeline transmission compressors, high-pressure oil field gas injection compressors and compressors for large air separation units) , it is not competitive. In the bbbber case, the impact will be small after the market is opened. However, the enterprises producing such products should have a sense of urgency, focus on improving the development and innovation ability, improve the technical content and grade of products, and narrow the gap with foreign countries. In the latter case, it will be greatly impacted after the market is opened. ② generally used Small and medium-sized ventilators in transit are the vast majority of products in the fan industry, belonging to large quantities and a wide range of products. It is equivalent to the situation mentioned above that the products have low cost and price advantage. After China's accession to the WTO, it will be conducive to expanding exports, and the opening of the domestic market basically does not pose a threat. For example, the world's more famous Fan enterprises are mainly German TLT company Among them, Shanghai Blower Factory Co Ltd. has introduced German TLT technology, Shenyang Blower Factory has introduced Danish novenko technology, Chengdu electric machinery factory and Shenyang Blower Factory have introduced German k.k.k technology, and British Haodeng company has established a wholly-owned enterprise in China Enterprises have already participated in the domestic fan market competition. From the price comparison of such products, taking the prices of Japanese manufacturers as an example, the prices of Japanese manufacturers' fans are now twice that of domestic fans. After China's accession to the WTO, the tariffs have been reduced, but their prices are still 50% ~ 60% higher than those of domestic products. This shows that such products will not be competitive after China's accession to the WTO It


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    1、用于开关量控制
      PLC控制开关量的能力是很强的。所控制的入出点数,少的十几点、几十点,多的可到几百、几千,甚至几万点,由于它能联网,点数几乎不受限制,不管多少点都能控制,所控制的逻辑问题可以是多种多样的:组合的、时序的、即时的、延时的、不需计数的、需要计数的、固定顺序的、随机工作的等等,都可进行。
      PLC的硬件结构是可变的,软件程序是可编的,用于控制时,非常灵活。必要时可编写多套或多组程序,依需要调用。它很适应于工业现场多工况、多状态变换的需要。
      用PLC进行开关量控制实例是很多的,冶金、机械、轻工、化工、纺织等等,几乎所有工业行业都需要用到它。目前,PLC首用的目标,也是别的控制器无法与其比拟的,就是它能方便并可靠地用于开关量的控制。2、用于模拟量控制
      模拟量,如电流、电压、温度、压力等等,它的大小是连续变化的。工业生产,特别是连续型生产过程,常要对这些物理量进行控制。
      作为一种工业控制电子装置,PLC若不能对这些量进行控制,那是一大不足,为此各PLC厂家都在这方面进行大量的开发。目前,不仅大型、中型机可以进行模拟量控制,就是小型机,也能进行这样的控制。PLC进行模拟量控制,要配置有模拟量与数字量相互转换的A/D、D/A单元。它也是I/O单元,不过是特殊的I/O单元。
      A/D单元是把外电路的模拟量,转换成数字量,然后送入PLC;D/A单元,是把PLC的数字量转换成模拟量,再送给外电路。作为一种特殊的I/O单元,它仍具有I/O电路抗干扰、内外电路隔离、与输入输出继电器(或内部继电器,它也是PLC工作内存的一个区,可读写)交换信息等等特点。
      这里的A/D中的A,多为电流,或电压,也有温度。D/A中的A,多为电压,或电流。电压、电流变化范围多为0~5V,0~10V,4~20mA,有的还可处理正负值的。这里的D,小型机多为8位二进制数,中、大型多为12位二进制数。A/D、D/A有单路,也有多路。多路占的输入输出继电器多。有了A/D、D/A单元,余下的处理都是数字量,这对有信息处理能力的PLC并不难。中、大型PLC处理能力更强,不仅可进行数字的加、减、乘、除,还可开方、插值,还可进行浮点运算,有的还有PID指令,可对偏差制量进行比例、微分、积分运算,进而产生相应的输出,计算机能算的它几乎都能算。
      这样,用PLC实现模拟量控制是完全可能的。
      PLC进行模拟量控制,还有A/D、D/A组合在一起的单元,并可用PID或模糊控制算法实现控制,可得到很高的控制质量。用PLC进行模拟量控制的好处是,在进行模拟量控制的同时,开关量也可控制。这个优点是别的控制器所不具备的,或控制的实现不如PLC方便。当然,若纯为模拟量的系统,用PLC可能在性能价格比上不如用调节器。
      3、用于运动控制

      实际的物理量,除了开关量、模拟量,还有运动控制。如机床部件的位移,常以数字量表示。运动控制,有效的办法是NC,即数字控制技术。这是50年代诞生于美国的基于计算机的控制技术。当今已很普及,并也很完善。目前,先进的金属切削机床,数控化的比率已超过40%~80%,有的甚至更高。PLC也是基于计算机的技术,并日益完善。PLC可接收计数脉冲,频率可高达几k到几十k赫兹,可用多种方式接收这脉冲,还可多路接收。有的PLC还有脉冲输出功能,脉冲频率也可达几十k,有了这两种功能,加上PLC有数据处理及运算能力,若再配备相应的传感器(如旋转编码器)或脉冲伺服装置,则完全可以依NC的原理实现种种控制。高、中档的PLC,还开发有NC单元,或运动单元,可实现点位控制。运动单元还可实现曲线插补,可控制曲线运动。

    1、For switching quantity control

      The ability of PLC to control the switching quantity is very strong. The number of points controlled in and out, less than a dozen points, dozens of points, more can be hundreds, thousands, or even tens of thousands of points, because it can be networked, the number of points is almost unlimited, no matter how many points can be controlled, the logic of the control can be a variety of issues: combination, timing, instant, delay, no counting, the need to count, fixed order, random work, etc., can be carried out.

      The hardware structure of the PLC is variable and the software program is programmable, which is very flexible when used for control. Multiple sets or groups of programs can be written when necessary and called as needed. It is very adaptable to the industrial site multiple conditions, multiple state transbbbbation needs.

      PLC for switching control is a lot of examples, bbbbllurgy, machinery, light industry, chemical industry, textile, etc., almost all industrial industries need to use it. At present, the goal of the first PLC, but also other controllers can not be compared with it, is that it can be easily and reliably used for switching control. 2, for analog control

      Analog quantities, such as current, voltage, temperature, pressure, etc., its size is continuously changing. Industrial production, especially the continuous production process, often to control these physical quantities.

      As an industrial control electronics, PLC can not control these quantities, it is a major deficiency, for which the PLC manufacturers are in this area for a lot of development. At present, not only large, medium-sized machine can be analog control, is a small machine, can also be such control. PLC for analog control, to be configured with analog and digital conversion of the A / D, D / A unit. It is also the I/O unit, but it is a special I/O unit.

      A/D unit is the analog quantity of the external circuit, converted into digital quantity, and then sent to the PLC; D/A unit, is the digital quantity of the PLC into analog quantity, and then sent to the external circuit. As a special I/O unit, it still has the characteristics of I/O circuit anti-interference, internal and external circuit isolation, and bbbbb and output relays (or internal relays, which is also a zone of PLC working memory, can read and write) to exchange inbbbbation and so on.

      Here the A in the A/D, mostly current, or voltage, but also temperature. the A in the D / A, mostly voltage, or current. Voltage, current change range is mostly 0 ~ 5V, 0 ~ 10V, 4 ~ 20mA, some can also handle positive and negative values. Here the D, small machines are mostly 8-bit binary numbers, medium and large are mostly 12-bit binary numbers. a / d, d / a single, there are also multiple. Multiplex accounts for more bbbbb and output relays. With A/D, D / A unit, the rest of the processing are digital, which is not difficult for PLC with inbbbbation processing capabilities. Medium and large PLC processing power is stronger, not only can be digital addition, subtrbbbbbb, multiplication, division, but also open square, interpolation, but also floating point operations, some have PID instructions, can be the deviation of the system amount of proportional, differential, integral operations, and then produce the corresponding output, the computer can calculate almost all of it can calculate.

      In this way, the use of PLC to achieve analog control is entirely possible.

      PLC for analog control, and A/D, D / A combination of units together, and the use of PID or fuzzy control algorithms to achieve control, you can get a very high quality of control. The advantage of using PLC for analog control is that in the analog control at the same time, the switch can also be controlled. This advantage is that other controllers do not have, or control is not as convenient as the implementation of PLC. Of course, if the system is purely analog, the use of PLC may be in the perbbbbance to price ratio is not as good as the use of regulators.

      3, for motion control

      The actual physical quantities, in addition to switching, analog, and motion control. Such as the displacement of machine parts, often expressed in digital quantities. Motion control, an effective approach is NC, that is, digital control technology. This is a computer-based control technology born in the United States in the 1950s. Today has been very popular, and also very well. At present, advanced bbbbl cutting machine tools, the rate of NC has been more than 40% to 80%, and some even higher. PLC is also based on computer technology, and increasingly perfect. PLC can receive counting pulses, the frequency can be as high as a few k to tens of k Hz, available in a variety of ways to receive the pulse, but also multiplexed reception. Some PLC and pulse output function, pulse frequency can also reach tens of k, with these two functions, coupled with the PLC has data processing and computing capabilities, if equipped with the corresponding sensors (such as rotary encoders) or pulse servo device, it can be fully in accordance with the principle of NC to achieve a variety of control. High-grade, mid-range PLC, but also developed NC unit, or motion unit, can achieve point control. Motion units can also achieve curve interpolation, curve control movement

    Translated with www.DeepL.com/Translator (free version)




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