ABB AC 800M

Transmission Technology Overview Section 1 Introduction
22 3BDS009029R5001 B
Transmission Technology Overview
Table 1. Transmission technologies at PROFIBUS
RS485 RS485-IS MBP Fibre Optic
Data
transmission
Digital, differential
signals according to
RS485, NRZ
Digital, differential
signals according to
RS485, NRZ
Digital, bit-
synchronous,
Manchester coding
Optical, digital, NRZ
Transmission
rate
9,6 to 12000 kbit/s 9,6 to 1500 kbit/s 31,25 kbit/s 9,6 to 12000 kbit/s
Data security
HD=4, Parity bit,
start/end delimiter
HD=4, Parity bit,
start/end delimiter
Preamble, error-
protected, start/end
delimiter
HD=4, Parity bit,
start/end delimiter
Cable
Shielded, twisted pair
copper, cable type A
Shielded, twisted 4-
wirer, cable type A
Shielded, twisted pair
copper
- Multimode glass
fibre,
- single mode glass
fibre
- PCF
- plastic
Remote feeding
Available over
additional wire
Available over
additional wire
Optional available
over signal wire
Available over hybrid
line
Protection type
None Intrinsic safety
(EEx ib)
Intrinsic safety
(EEx ia/ib)
None
Topology
Line topology with
termination
Line topology with
termination
Line and tree
topology with
termination; also in
combination
Star and ring
topology typical, line
topology possible
Number of
stations
Up to 32 stations per
segment without
repeater, up to 126
stations with repeater
Up to 32 stations per
segment without
repeater, up to 126
stations with repeater
Up to 32 stations per
segment, total sum of
max 126 per network
Up to 126 stations
per network
Number of
repeaters
Max. 9 repeater with
signal refreshing
Max. 9 repeater with
signal refreshing
Max. 4 repeater Unlimited with signal
refreshing (time
delay of signal)