BECKHOFF BC3150 - Manual (Page 91)

Safety Instructions
Fieldbus Components 89
RS485
Fundamental
properties
RS-485 transmission according to the Profibus standard
Network topology Linear bus, active bus terminator at both
ends, stubs are possible.
Medium Screened twisted cable, screening may
be omitted, depending upon the
environmental conditions (EMC).
Number of stations 32 stations in each segment with no
repeater. Can be extended to 127
stations with repeater
Max. bus length without repeater 100 m at 12 Mbit/s
200 m at 1500 Kbit/s, up to 1.2 km at
93.75 Kbit/s
Max. bus length with repeater Line amplifiers, or 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
Transmission speed 9.6, 19.2, 93.75, 187.5, 500, 1500 Kbit/s,
up to 12 Mbit/s, adjustable in stages
Plug connector 9-pin D-Sub connector for IP20
M12 round plugged connector for IP65/67
Cabling for
Profibus DP
and
Profibus
FMS
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 is changed while the Fieldbus Box is
switched off. To do this, unscrew the cover and use a screwdriver to move the switches to the
desired position. Make sure that the switches engage properly. The change in address is
active as soon as the device is switched on.
Address Fieldbus Box
The switch on the left represents the tens, while that on the right represents the units.
Address Buscoupler
The switch S311 represents the tens, while that S310 represents the units.