ABB AC 800M, User Manual

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Fieldbus Topology with MBP (PROFIBUS PA) Section 3 Fieldbus Topologies
72 3BDS009029R5001 B
Fieldbus Topology with MBP (PROFIBUS PA)
PROFIBUS PA with MBA transmission technology is realized in tree or line
structure, and any combination of the two. In the line structure, stations are
connected to the trunk cable using T-junctions.
The tree topology is comparable to the classic field installation method. The multi-
core cable is replaced by the two wire bus cable, the field distributor retains its
function of connecting the field devices. By tree topology the maximum permissible
spur line length must be taken into account when calculating the overall line length.
Figure 25. PROFIBUS PA embedded in 800xA