性阻抗为100Ω的双绞屏蔽电缆STP-100Ω(forFF&PROFIBUS-PA)onepair18AWG则应用于FF、PROFIBUS-PA总线，常用18AWG导体。
485总线由于其布线简单，稳定可靠从而广泛的应用于视频监控，门禁对讲，楼宇报警等各个领域中，在485总线布线过程中由于有很多不完全准确的概念导致出现很多问题。
如果由于现场的限制，必须要进行星型连接或者树形连接，可以使用深圳市富永通科技有限公司的485集线器和485中继器解决相关问题。
5.485总线必须要接地。
在很多技术文档中，都提到485总线必须要接地，没有详细的提出如何接地。
Control cables and flame retardant (ZR) for crosslinked polymer insulation 0.6/1kv can be manufactured as re
MHY32(PUYV39、PUYV39-1)矿用聚乙烯绝缘阻燃聚氯乙烯护套单层钢丝铠装井筒矿用信号电缆用于斜井或竖井中作主信号电缆MHYVRP(PUYVRP)矿用聚乙烯绝缘阻燃聚氯乙烯护套铜丝编织屏蔽软矿用信号电缆用于井下平巷或斜巷作矿用信号电缆MHYVP(PUYVP)矿用聚乙烯绝缘阻燃聚氯乙烯护套。
Precautions for installation of power cables: keep 2m distance when the cable is installed in parallel with the thermal pipe, and 0.5m should be maintained when crossing. The cable shall be installed at a distance of 0.5m in parallel or across other pipelines. When the cable is directly buried and installed, the buried depth of 1-35kv cable is not less than 0.7m. When 10KV and below cables are installed in parallel, the net distance between them shall not be less than 0.1m and 10-35kv shall not be less than 0.25m. The distance of cross installation is not less than 0.5m. Cable laying temperature is not lower than 0 ℃, bending radius: multi-core cable or 15 (D + D), a single cable 20 or more (D + D), (D for cable diameter, D) for the conductor diameter. 6 kv and above cable joint: (1) installing a cable terminal head, must be stripped semiconductor electric shielding layer, operation shall not damage the insulation, should avoid mark uneven situation, when necessary use sand paper to grind; The shield end should be flat and the graphite layer (carbon particles) should be cleaned. (2) plastic cable end copper tape screened and armor must be good grounding, the short circuit also follow this principle, avoid unbalanced three-phase run ShiGang armoured end produce inductive electromotive force, and even "lighter" and accidents such as burning sheath. It is required to use my tinplate to braid copper wire for grounding lead. When connecting with the cable copper belt, it should be welded with chromium-iron tin. The shield of three-phase copper tape should be connected with ground wire respectively. Note that the shielded ground wire and steel armor ground wire should be separately drawn out and insulated from each other. The position of the welded ground wire should be as low as possible. Basic re for cable terminals and intermediate joints: a. good conductor connection; B. The insulation is reliable, and it is recommended to use irradiated cross-linked heat-shrinkable silicone rubber insulation materials; C. good sealing; D. sufficient mechanical strength to meet various operating conditions. The end of the cable must be used to prevent erosion of water and other corrosive materials, so as to prevent breakdown due to the aging of the insulation layer caused by water trees. Crane or forklift should be used for the loading and unloading of cables. It is forbidden to run flat or lay flat. For installation of large cables, cable laying cart should be used to avoid external damage or abrasion caused by manual dragging. If the cable cannot be laid in time for some reason, it should be stored in a dry place to prevent sunlight from exploding and water entering the end of the cable. Note: the installation of wire and cable should be done by the installation personnel or full-time technical personnel familiar with the performance of wire and cable. If there are still unclear matters, please consult the relevant technical department or the technical department of our factory.
位置控制接线图根据接线图我们可以看出，伺服的功能强大，拥有很多引脚，很多功能。
我们可以根据自己的需求，只接其中的部分引脚即可。
（其中7号引脚需接12~24v，41号引脚和29号引脚短接到0v，必须要接的）如果我们用plc对伺服进行控制，若是我们接的3,4,5,6号引脚，则我们需要将3号和5号引脚短接到24v，4号和6号引脚串接2KΩ的电阻后分别接到PLC的脉冲输出和方向输出端子上。
如果我们用的是1，4，2，6号引脚，则我们不需要串电阻即可。
NH-VV23NH-VLV23聚氯乙烯绝缘双钢带铠装聚乙烯护套耐火电力电缆PVCinsulatedsteeltapearmouredPEsheathpowercableNH-VV32NH-VLV32交联聚乙烯绝缘细圆钢丝铠装聚氯乙烯护套耐火电力电缆PVCinsulatedthinsteel。
电动葫芦电缆-电动葫芦专用电缆-电动葫芦带丝绳专用电缆使用特性:额定电压：U0/U0.6/1KV及以下最高工作温度：100℃最低环境温度：固定敷设-40℃简单介绍HYA电缆色谱-HYAT电缆色谱-HYAC电缆色谱-以及计算机电缆都采用此标准电缆色谱电缆色谱的详细介绍国际布线标准电缆色谱：主色：白--。
芯线数：2—5芯，7—36芯（CCC目录外产品，无CCC认证）。
截面积：0.75-2.5mm²，0.5、2.5—35mm²（CCC目录外产品，无CCC认证）。
测试电压：2000V，5min。
Broadband type/product use: suitable for transmission systems from remote optical network units to users, as well as subsystems for transmission between buildings in building wiring systems. The highest transmission fre are 30MHz and 100MHz respectively.
也可提供双层护套的通信电缆。
在缆芯中和屏蔽层的内外表面用石油膏填充或浇注处理，以防止煤矿中水分侵入。
在煤矿常见的30~C一60~C的环境条件下，煤矿用通信电缆的机械和电气性能保持不变。
用于平巷、斜巷及机电硐室做通信线以及用于平巷，竖井或斜井作主信号传输。
合理的结构设计，严格的选材，精良的生产加工，严格的质控程序，保证产品在实际应用中效果良好。
三、使用条件：1、电缆仅用于建筑物内，且环境温度应保持在5-40℃范围内。
2、正常使用时，导体最高温度为70℃。
2800转的二极电机一般不太常见，这种电机对比四极电动机给人以轻巧伶俐的感觉，它最主要的特点就是转速高，但扭力小，这两点是和四极的最大不同点，这也导致它适用范围窄，只适用于轻负荷，高转速的工作方式，常被用于排风或送风系统中。
个人可以这样理解关于电动机的极对数的窍门：极对数多，也就是磁极多，需要线圈也就多，体积必然就大，重量必然重，相应的产生的力也就越大，同样转动一圈需要路过的磁推力点也就越多，速度就慢。
型号及名称表 1型 号名 称铜芯铝芯VV－PYJV－PVLV－PYJLV－P聚氯乙烯(交联聚乙烯)绝缘金属屏蔽聚氯乙烯护套电力电缆VV22－PYJV22－PVLV22－PYJLV22－P聚氯乙烯(交联聚乙烯)绝缘金属屏蔽钢带铠装聚氯乙烯护套电力电缆VV32－PYJV32。
1. Rated voltage U0/U: 0.6/1kv. 2. The long-term allowable temperature of the cable conductor is +90 degrees, and the short-circuit temperature is +250 degrees. 3. Installation and laying temperature: greater than or equal to 0 degrees, and the fixed dressing temperature is lower than -10 degrees. 4. Allowable bending radius of cable: greater than or equal to 15D(d-cable outer diameter).
电子计算机用屏蔽电缆本产品技术指标参照IEC189和英国BS53081、用途电子计算机用屏蔽电缆，选用介电常数小的高压聚乙烯绝缘，采用对绞、对屏、总屏（或三线组绞合、组屏蔽、组屏总屏）等结构组成，具有介质损耗小、传输信号能力强、抗干扰性能好特点，能可靠地传输微弱的模拟信号或数字信号，可广泛地应用于发。
一些常见问题:(希望各位买家能花上几分钟时间认真阅读)1.电线一扎长度:100米,正负误差2-3米;2.电线型号:BV单股,BVR多股,BVV双胶单股,BVVR双胶多股;3.电线常用规格:1平方/1.5平方/2.5平方/4平方/6平方/10平方等;区别:BV为单股线,BVR为多股,BVR比BV贵5%。