ABB AC 800M

Table of Contents
6 3BDS009029R5001 B
MBP network limits............................................................................................. 35
MBP power and line length calculation............................................................... 36
Adding field devices to the MBP network........................................................... 38
MBP cycle time calculation ................................................................................. 39
PROFIBUS DP/PA Linking Device LD 800P .....................................................40
Fibre Optic Transmission Technology ............................................................................ 42
Fibre optics cable type and speed ........................................................................ 42
Fibre optic network limits....................................................................................44
Monitoring of the communication quality ...........................................................45
Basics of fibre optics topology technologies ....................................................... 46
Calculation of transmission delay time TTD ....................................................... 54
Section 3 - Fieldbus Topologies
Overview .........................................................................................................................57
Point-to-Point Topology....................................................................................... 59
Line Topology ...................................................................................................... 60
Line Topology with spurs ................................................................................... 60
Tree Topology ..................................................................................................... 62
Star Topology ......................................................................................................63
Ring Topology .................................................................................................... 64
Fieldbus Topology with RS485 (PROFIBUS DP) ..........................................................65
Bus length and speed ........................................................................................... 65
Bus termination....................................................................................................66
Bus connector ...................................................................................................... 67
Shielding and data line connection ...................................................................... 69
Bus spur lines.......................................................................................................69
RS485 limits and network design ........................................................................70
Fieldbus Topology with MBP (PROFIBUS PA) ............................................................. 72
Bus length and speed ........................................................................................... 73
MBP and intrinsically safe installation................................................................ 75
Bus termination....................................................................................................76
PROFIBUS PA junctions and connectors ............................................................77
Shielding and data line connection ...................................................................... 79