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Product Catalogue Product Catalogue eClass 5. Configurator Overview. For this product a successor is available 6GKCA No picture available. Lead CAS-No. Show prices. The attachment of the node to the bus is via a bus terminal with a tap line or a bus connector maximum 32 nodes per segment. The individual segments are interconnected by repeaters.
S The type of cable being used. S Purely passive passing on of signals allows nodes to be deactivated without affecting the network except for the nodes that supply power to the terminating resistors.
S Simple installation of the bus cable without specialized experience. S Distance covered reduces as the transmission rate increases. S Requires additional lightning protection measures when installed outdoors.
If reductions in the segment length are necessary when using special versions of the bus cable with increased d. Duplex fiber-optic cables are used as the medium made of glass, PCF or plastic fibers. Duplex fiber-optic cables consist of two conducting fibers surrounded by a common jacket to form a cable.
Modules with integrated optical ports and optical bus terminals OBTs can be interconnected to form optical networks only with a bus structure. Using OLMs, optical networks can be installed using a bus, star and ring structure.
The ring structure provides a redundant signal transmission path and represents the basis for networks with high availability. S Regardless of the transmission rate, large distances can be covered between two DTEs.
S Electrical isolation between nodes and transmission medium. S When plant components at different ground potential are connected, there are no shield currents. S No electromagnetic interference. S No additional lightning protection elements are required. S Simple laying of fiber-optic cables. S High availability of the LAN due to the use of a ring topology.
S Extremely simple attachment technique using plastic fiber-optic cables over shorter distances. S Frame throughput times are increased compared with an electrical network. S The assembly of glass fiber-optic cables with connectors requires specialist experience and tools. The optical ports of the OLMs are optimized for greater distances.
The direct coupling of the optical ports of an OLM with an OBT or integrated optical ports is not possible due to differences in the technical specifications. The only transmission medium is a free line-of-sight connection between two nodes. The maximum distance covered is approximately 15 m. Wireless networks are implemented using infrared link modules ILM. The nodes to be networked are attached to the electrical port of the ILM. S High mobility of attached plant components for example trolleys.
S Coupling and decoupling from the fixed network with no wear and tear for example substitute for a slip ring. S Coupling without cable installation temporary setup, inaccessible areas. S Electrical isolation between nodes and hardwired network. S Free line-of-sight path required between nodes. S Only for single master networks. The wireless infrared transmission technique has the following characteristics:. The transmission medium is a shielded, twisted pair cable.
The signal is transmitted as a synchronous data stream Manchester-coded at In general, the data line is normally also used to supply power to the field devices. S Simple cabling with twisted pair. S Remote power supply via the signal cores. S Intrinsically safe operation possible for hazardous areas. S Up to 32 nodes per cable segment. S Transmission rate restricted to The main characteristics of the IEC transmission technique are as follows:. Depending on the transmission rate, transmission medium, and network components different segment lengths and therefore different network spans can be implemented.
S Components for transmission rates from 9. Each bus segment must be terminated at both ends with its characteristic impedance.
This cable terminator is integrated in the RS repeaters, the bus terminals, the ILM and the bus connectors and can be activated if required. Before the cable terminator can be activated, the component must be supplied with power. With the bus terminals and the bus connectors, this power is supplied by the connected DTE, whereas the RS repeater, the ILM, and the terminator have their own power supply. The RS transmission technique allows the attachment of a maximum of 32 devices DTEs and repeaters per bus segment.
The maximum permitted cable length of a segment depends on the transmission rate and the LAN cable used. By using RS repeaters, segments can be interconnected. You require an RS repeater when you want to attach more than 32 nodes to a network or when the permitted segment length is exceeded. A maximum of 9 repeaters can be used between any two nodes. Both bus and tree structures can be implemented.
Figure shows a typical topology using the RS technique with 3 segments and 2 repeaters. Increasing the overall span of a network by using repeaters can lead to longer transmission times that may need to be taken into account when configuring the network see Chapter 3. The following bus attachment components can be used for transmission rates up to 12 Mbps:. If you want to cover larger distances with the fieldbus regardless of the transmission rate or if the data traffic on the bus is threatened by extreme levels of external noise, you should use fiber-optic cables instead of copper cable.
To interface electrical cables with fiber-optic cables, you have the following possibilities:. S Optical networks with a larger network span or structured as redundant rings should be implemented using OLMs. The structure of optical networks using optical link modules OLMs is described in detail in later chapters in this manual.
The OLMs have a floating electrical channel similar to the channels on a repeater and depending on the version, they have one or two optical channels. The OLMs are suitable for transmission rates of 9. The transmission rate is detected automatically. At the start and end of a bus, OLMs with one optical channel are adequate, in between, OLMs with two optical channels are required.
Several optical link modules are grouped together to form a star coupler via a bus connection of the RS interfaces. This RS connection allows the attachment of further DTEs until the maximum permitted number of 32 bus attachments per segment is reached. Depending on the requirements and the distance, the duplex cables can be implemented with plastic, PCF or glass OLM only fibers. Using the echo function, the connected OLMs can monitor the fiber-optic sections.
A break on a link is indicated by a display LED and by the signaling contact responding. Even if only one transmission direction is lost, the segmentation triggered by the monitoring function leads to safe disconnection of the OLM from the star coupler. The remaining network can continue to work without problems. Redundant optical rings are a special form of bus topology. By closing the optical bus to form a ring, a high degree of operational reliability is achieved.
A break on a fiber-optic cable between two modules is detected by the modules and the network is reconfigured to form an optical bus. The entire network remains operational. If a module fails, only the DTEs or electrical segments attached to the module are separated from the ring; the remaining network remains operational as a bus. The problem is indicated by LEDs on the modules involved and by their signaling contacts.
After the problem is eliminated, the modules involved cancel the segmentation automatically and the bus is once again closed to form a ring. To increase the availability, the duplex cables for the outgoing and incoming paths in the ring should be routed separately. If the distance between two OLMs turns out to be too long, a structure as shown in Figure can be implemented. The operating wavelength of the integrated optical interfaces and the OBT is optimized for the use of plastic or PCF fibers.
The direct attachment of glass FO cables is not possible. If a link with glass FO cable is required, for example to span distances of more than m, this link must be implemented with OLMs. The attachment of glass links to the optical bus made up of integrated optical interfaces is via the RS interface of an OBT.
The following schematic shows an example of an application:. Regardless of the transmission rate, the maximum length of a link is 15 m. This means that at a distance of 11 m, an ILM illuminates a circular area with a diameter of 4 m. The communication partner must be within this illuminated area. There must be an uninterrupted line-of-sight path between both ILMs. The ILMs are suitable for transmission rates of 9. To implement a point-to-point link, two ILMs are positioned opposite each other so that each is located within the infrared light cone of the other.
The maximum distance between two modules is 15 m. Remember that only slave nodes are permitted in the slave network segment. Only the ILMs positioned opposite each other can exchange data. A data exchange between adjacent ILMs is only possible by using a surface that reflects infrared light.
If you consider this option, remember that the length of the link is the path from the ILM to the reflector and from the reflector to the partner ILM. Signal attenuation will also occur since the reflector can only reflect part of the infrared light to the partner ILM.
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