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Under the bad environment should have the characteristics of the Ethernet cable
Author:Yixing Xin Mao Cable Material Co., Ltd. | Addtime:2013-7-4 | Hits:
Ethernet is connected to the world the undisputed hegemon, in recent years has been firmly occupy the territory of the commercial office environment.
Control and automation is also towards the open, standards-based technology development. You think if adopted by the reception desk cable can also satisfy the industrial process control and automation technology environment, the strict requirements of? In fact, the COTS (market) popular 5 e class unshielded twisted pair (UTP) Ethernet cable in industry standard to measure is very fragile. In addition may be obvious physical damage, there is more covert, invisible electromagnetic/radio frequency interference. If want to laying on the ground in the factory and not a commercial grade 5 class e unshielded twisted-pair cable, the result will be how?
Installation problem
Use excessive force stretch commercial-grade UTP will spin cable. Commercial standard maximum stretch force for 25 LBS. Stretch before, the cable is 100 feet, stretch, could become 100 feet 2 inches! Cable can cause excessive long signal loss (attenuation) and signal delay. These effects will limit cable distance possible. When handling cable, twisted pair may spread out, change the line spacing between the wires center, cause imbalance. So, line to have more coupling effect between (crosstalk), signals echo (return loss), are more easily affected by the surrounding electromagnetic/radio frequency interference. Any one of these factors may cause the loss of the cable to transmit data, industrial process interruption or security problem. Belden's lines to the adhesion of patents for technology can prevent to open are scattered, guarantee the design of the cable performance. Each line of the insulation of the conductor along the entire cable physically touching together. No matter how you handle, even in the installation, line to also won't be separate by accident. Adhesion lines also increases the mechanical strength, in addition to the mechanical stability, and improve the degree of resistance to pull. Only Belden cable has installed this model performance TM (Installable PerformanceTM), to ensure that control network has the biggest strength.
The temperature influence
The above problems are caused by the carrying cable. Extreme temperature environment encountered in some industrial applications will have what problem? Extreme cold will make the cable hard, brittle, hard to use. Especially in the cable is too brittle when installation is a very serious problem. On the other hand, the high temperature may make the cable used in the plastic performance degradation. According to the desired temperature corresponding cable laying. Cable temperature rating is not the only factor. When more than 20 ¡æ, every increase 1 ¡æ, the COTS 5 e class the attenuation of the cable will be increased by 0.4%. At 60 ¡æ, attenuation may be increased by 16%. At present, Belden provides a DataTwist cable, to enhance the high-temperature resistance attenuation performance. On the other hand, you can shorter cable laying, or hope the signal is strong enough, that under electromagnetic/radio frequency interference can be correctly received. Unfortunately, as previously mentioned, the allowance of the cable height and inherent immunity may have been damaged during installation. Only Belden adhesion of the patented line of technology can prevent caused by installation drawing graphite change, even if given more information (such as environmental temperature rise) also can ensure the performance of the promise. Don't you want to in the worst possible environment used in the application of the tenacity cable?
Ultraviolet (uv) radiation and sunlight
Most of the commercial category 5 e cables is not used for outdoor use, when the cable is exposed to the sun's ultraviolet rays, the plastic of the cable sheath will accelerate decomposition. The sheath of the mechanical strength (i.e., separate) began to reduce, shorten the service life of the cable. Belden DataTwist products provides the SUN (SUN RES) cable sheath, and ensure that they can in the practical application of durability.
Oil resistant
In the actual daily production activity, a lot of parts need to be very good lubrication to ensure smooth operation. Extracted from oil lubricating oil into the COTS category 5 e cables, especially at high temperature. Oil will cause the cable sheath expansion, loss of mechanical strength, make the soft-core exposed. DataTwist cable provides a variety of oil sheath, can meet your production needs.
Mechanical force: wear, cutting and rolling
Have you ever work environment everywhere to do with you? But if you and a cable for everywhere, also must want to walk on the cable, for example, it may cause data transmission error or network latency. When driving on cable, it might damage the whole cable. Ordinary commercial cable or even have a chance of escape. DataTwist cable has industrial cable sheath, some of which have unique surface sheath, for wear and cut to provide additional mechanical protection. If you want to get the maximum mechanical protection, so strengthening DataTwist products is the best choice. Using interlocking reinforced armored, adhesion line and Belden can be installed performance ensures that you can have the most tenacious Ethernet cable.
Electromagnetic/radio frequency interference, noise and shielding
Above problems are obvious, because you can see or feel the occurrence of these problems. But you can't easily learned that EMI/RFI when and whether has caused major damage to the network. To avoid potential interference sources is the best choice. The first step is, when the cable laying should be far away from disturbance sources as far as possible, such as electric welding machine switch, relay or dc drives. When you try to control, such as welding robot and similar interference sources should be how to do? One way is to use the cable. Fiber optic cable can absolutely avoid the effects of electromagnetic/radio frequency interference. If you worry about the cost, complexity, or the strength of fiber optic cable, can consider to adopt block 5 e class copper solution. Even a simple layer of the aluminum foil shield, can also provide very significant when correct grounding of the ability of resisting electromagnetic/radio frequency interference.
grounding
Proper grounding is the key to effective shielding. No grounding or incorrect may reduce the effect of shielding. The ideal shielding grounding should only contact. When the interfering signal coupling to the shield current will be imported, the land to avoid the line under the shield to be affected. When the shielding of the proximal and distal and ground connection, is likely to form a ground loop. Proximal and distal position of the electric potential difference will be in conductive shielding layer is formed on the huge potential difference and current accordingly. Make shielding shielding on the flow of the current carrying the signal line of interference sources.
balance
Highly balanced, stable UTP may provide a lot of resistance to interference. Line for every half of new ground can be regarded as a loop antenna. Another half continuous new ground in contrast to the above wires in direction. In a balanced ideal cable, loop antenna alternating polarity will offset plus online against interference. Adhesion line for cable provides the most close to the perfect balance of properties, especially in rough after installation and mechanical damage in everyday use. When interference exists, the balance and stability of the cable is the key to its success or failure in the application of industrial Ethernet.
Industry standard
The standardization of open is a major advantages of Ethernet. Any products can be designed to meet the minimum requirements stipulated in the IEEE. Followed by the Ethernet cable of the most commonly used is the current standard of the TIA (telecommunications industry association) with the EIA (protocol) in electronics industry jointly formulated and implemented. TIA/EIA 568 - B describes the relevant commercial building communications wiring (cable and connectors) rules. TR - 42 committee responsible for telecommunications infrastructure cabling standards. TR - 42.9 branch is responsible for telecommunications infrastructure industry, and may be released at the end of 2003 an industrial Ethernet standards. In coordinating industrial Ethernet standards in the application of different groups, each group under the great efforts. In Europe, industrial automation and open network association (IAONA), international electrotechnical commission (IEC) and the Cenelec (electronic technical standards of the European commission) is working with TIA/EIA and the communication between each other. Goal is to offer truly open for industrial Ethernet, coordination, based on the standard industrial communication system.
conclusion
Ethernet technology in the control and automation networks have the advantage of high speed and economies of scale. Must be based on industrial Ethernet environment faced by the actual problem to adjust. Although the COTS cable can be used in some industrial applications, but in some applications, the COTS cable can't be accepted due to lack of resilience. Belden DataTwist adhesion line of cable is shielded and unshielded twisted pair cable provides the best mechanical stability, the greatest degree to reduce the impact of bad environment, at the same time provides a unified installation type performance. Additional industrial plastic sheath or armoured sheath for cable provides extra protection and intensity, realized the anticipated design goal of high-level control engineers. Therefore, you in developing your control system, you can ask yourself: my Ethernet cable strong enough?
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