FLN3524A Processing logic module

Configuration Rules for Twisted Pair media • Max. cable length = (length of trunk cable) + 3*(total length of tap cables)=750m.(1) • Length of Tap cable: 0 - 10m.(2) • Max. number of nodes on a Twisted Pair Cable segment: 32. Attenuation in a tap cable is 50% higher than in the trunk cable. A tap cable is intended to be used within a cabinet. Segments - Minimum Length for Twisted Pair Media For twisted pair media, the minimum cable length between two modems (for example, TC516 and TC513) or two communication interfaces with integrated modems (for example, CI527 and CI869) is 4 meters (13 ft). This is true also for redundant CI modules in a controller, for example, the cable between a redundant pair of CI869s in an AC 800M controller also needs to be 4 meters.

Configuration rules for Coaxial media 

• Max. cable length: – 300 meter (1000 ft.) if coaxial cable type RG59 is used. – 700 meter (2300 ft.) if coaxial cable type RG11 is used. • Max. length of Drop cable: 0.3 meter (1 ft.) • Max. number of nodes: 80. Segments - Minimum Length for Coaxial Media For coaxial media, the minimum cable length between two modems (for example, TC625 and TC513) or two communication interfaces with integrated modems (for example, CI626 and CI630) is 3 meters (10 ft). For connection between two redundant communication interfaces within a redundant CI522 or CI630 pair, a minimum distance up to 0.1 meter is allowed, if the distance to the next communication interface is 3 meters or more.

This formula is applicable also for 8500m

 and 15000m configurations. For information about equipment supporting these lengths, see Advant Fieldbus 100 Length Concept on page 33. When using Advant Fieldbus 100 in the tree configuration, the bus length is the distance between the two stations on the bus that is the farthest apart. This means that the length between different combination of pairs of stations must be considered to decide which two stations are the farthest apart. The same methods for calculating the bus length as well as the possible length is valid both for star configuration and the common bus configuration. Figure 32 shows an Advant Fieldbus 100 in a tree configuration. The same rules as for Figure 31 is valid when calculating the cable length. The only difference is that the two stations that is the farthest apart is to be used in the calculation.

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