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2711-T10G20触摸屏
电缆布线注意事项连接到FA-M3的信号电缆携带谐波成分。信号电缆的作用就像天线，将这些谐波成分作为噪声发射到外部空间，同时从外部空间接收噪声。因此，有必要使用屏蔽信号电缆。FA-M3的EMC一致性测试使用屏蔽电缆和FG夹具进行。下面总结了电缆布线过程中应注意的事项。图A3.38以图形方式对此进行了说明在连接到此设备的信号电缆中，从面板外壳引出的电缆应进行屏蔽。引出面板外壳（例如连接到集线器）的10BASE-T和100BASE-TX电缆段应屏蔽。设计系统时，应使面板外壳的开口尽可能小，以尽量减少面板外壳内产生的噪音泄漏。建议电缆开口的直径应小于100 mm，通风开口的直径应该小于125 mm。拆除屏蔽电缆上的部分屏蔽，露出电线，并用FG夹具将其接地至面板外壳的金属板。当使用排流线以抽头方式连接到金属板时，它不能确保低阻抗抗谐波噪声，也不能提供足够的接地效应（噪声屏蔽效应）。电源模块（F3PU30-0S和F3PU36-0S）和YHLS从机（TAH系列）的电源电缆应配备铁氧体磁芯，以防止干扰发射。
采取以下纠正措施
布线电缆时，如有必要。-使接线电缆尽可能短。这样可以最大限度地减少电缆的噪音发射和电缆上的噪音接收在易受噪声影响的信号电缆周围安装铁氧体磁芯，以减少噪声的影响。铁氧体芯应安装在面板外壳的电缆出口附近布线易受噪声影响的电缆时，应将其与噪声源电缆隔离。在布线电缆时，有几种方法可以实现隔离按距离隔离（电缆布线距离动力电缆至少20 cm，距离其他电缆组至少10 cm）在电缆之间放置接地金属板。-将每个电缆组穿过接地金属导管或屏蔽管在电缆上插入过滤器时，确保过滤器前后的接线距离足够远。否则，噪声可能会转移到其他电缆段，并降低滤波器的有效性。特别注意以下区域：-电源电缆中插入的噪声滤波器-信号电缆周围安装的铁氧体芯-信号电缆中插入降噪电路（浪涌保护器电路、避雷器电路等）YHLS从设备（TAH系列）24V DC电源的注意事项-为TAH系列使用专用24V DC供电。避免与其他设备共用电源电源应包含内部噪声过滤器电源电缆上应安装铁氧体磁芯。
Considerations on Cable Routing
Signal cables that are connected to the FA-M3 carry harmonic components. The signal cable acts like an antenna and emits these harmonic components as noise to the external space and at the same time receives the noise from the external space. Therefore, it is necessary to use shielded signal cables. The EMC conformance test of the FA-M3 is conducted using shielded cables and FG clamps. The considerations that should be observed during cable routing are summarized below. Figure A3.38 illustrates this graphically. - Of the signal cables connected to this equipment, those that lead out of the panel enclosure should be shielded. 10BASE-T and 100BASE-TX cable sections that lead out of the panel enclosure (say, to connect to a HUB) should be shielded. Design the system so that the opening of the panel enclosure is as small as possible to minimize possible leakage of noise generated within the panel enclosure. It is recommended that the diameter of the opening for the cable should be less than 100 mm and that of the opening for ventilation should be less than 125 mm Remove part of the shield on a shielded cable to expose the wire and ground it to the metal plate of the panel enclosure with an FG clamp. When connected to the metal plate in a pig-tail way using a drain wire, it cannot ensure low impedance against harmonic noise and cannot provide sufficient grounding effect (noise shield effect).Power supply cables of power supply modules (F3PU30-0S and F3PU36-0S) and YHLS Slave Units (TAH Series) should be fitted with ferrite cores to prevent interference emission.
Adopt the following corrective actions
if necessary when routing the cables. - Make the wiring cable as short as possible. This minimizes noise emission from the cable and noise receipt on the cable. - Fit a ferrite core around signal cables susceptible to noise to reduce the effect of the noise. Ferrite core should be fitted near the cable outlet of the panel enclosure. - When routing cables that are susceptible to noise, isolate them from cables that are noise sources.There are several ways to achieve isolation when routing the cables. - Isolation by distance (Route cables at least 20 cm away from power-motive cables and at least 10 cm away from other cable groups). - Place a grounded metal plate between the cables. - Route each cable group through a grounded metal conduit or a shielded tube. - When inserting a filter on a cable, make sure that wiring before and after the filter is sufficiently far apart. Otherwise, noise may transfer to other cable sections and reduce the effectiveness of the filter. Pay special attention to the following areas: - Noise filter inserted in the power supply cable - Ferrite core fitted around signal cables - Noise reduction circuits (surge protector circuit, arrestor circuit, etc.) inserted into signal cables
Considerations for 24V DC Power Supply to YHLS Slave Units (TAH Series) - Use a dedicated 24V DC power supply for the TAH series. Avoid sharing power with other equipment. - The power supply should incorporate an internal noise filter. - A ferrite core should be fitted on the power cable.
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