Fig. 75 Profibus Cable Assignment - Beckhoff BC3150 Documentation

PROFIBUS wire colors
PROFIBUS line
B red
A green
RS485 - Fundamental properties
RS-485 transmission according to the PROFIBUS standard
Network topology
Medium
Number of stations
Max. bus length without
repeater
Max. bus length with repeater
Data transfer rate
Connector
Cabling for PROFIBUS-DP and PROFIBUS_FMS
Fig. 75: PROFIBUS cable assignment
Termination resistors
In systems with more than two stations all devices are wired in parallel. The PROFIBUS ca-
ble must be terminated with resistances at both ends, in order to avoid reflections and as-
Note
sociated transfer problems.
Addressing
Setting of station addresses
The PROFIBUS address must be set using the two rotary selection switches behind the transparent cover.
The default setting is 11. Any address is permitted, but each address may only be used once within the
network. The address can be modified when the Fieldbus Box (Bus Coupler) is switched off. Release the
cover (Fieldbus Box only) and set the switches to the required position using a screwdriver. Make sure that
the switches engage properly. The change in address is active as soon as the device is switched on.
Fieldbus Box address
The switch on the left represents the tens, while that on the right represents the units.
BC3150
M12
Pin 4
Pin 2
Linear bus, active bus terminator at both ends, stubs are possible.
Screened twisted cable, shielding may be omitted, depending upon the
environmental conditions (EMC).
32 stations in each segment with no repeater. Can be extended to
127 stations with repeater
100 m at 12 Mbit/s
200 m at 1500 kbit/s, up to 1.2 km at 93.75 kbit/s
Line amplifiers (repeaters) can increase the bus length to the order of
10 km. The number of repeaters possible is at least 3, and, depending on
the manufacturer, may be up to 10
9.6, 19.2, 93.75, 187.5, 500, 1500 kbit/s, up to 12 Mbit/s, infinitely variable
9-pin D sub connector for IP20
M12 round connector for IP65/67
Version: 2.1.0
D sub
Pin 3
Pin 8
PROFIBUS
85