PROFIBUS “Economy plus” Bus Coupler, fibre optic BK3520
Power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus signal input 1
Fieldbus signal output 1
Configuration interface
Fieldbus signal input 2
Fieldbus signal output 2
Address selector
Address selector

BK3520 | PROFIBUS “Economy plus” Bus Coupler, fibre optic

PROFIBUSThe BK3520 “Economy plus” Bus Coupler links a fiber optic PROFIBUS system to the modular, extendable electronic Bus Terminal system. With the K-bus extension technology up to 255 spatially distributed Bus Terminals can be connected to one Bus Coupler.

The particular feature for the BK3520 Bus Coupler is its fiber optic connection and its high transmission rate of up to 12 Mbaud. The fiber optic link guarantees that the transmission is free from electromagnetic interference and provides full electrical isolation.

An interface-module is necessary to translate between the physical properties of RS485 to those of an underlying optical fiber ring. The topology corresponds with the RS485 physics (line topology). For this reason, the BK3520 possesses two transmitters and two receivers. The address is set by the address selection switch. The baud rate is automatically recognized. Baud rates of up to 12 Mbaud are supported, so that the transmission speed can be adapted to meet the needs of the particular technical process.

The “Economy plus” Bus Coupler has been designed to accommodate automation requirements. PROFIBUS protocols omit FMS operation in order to be able to transfer more user data in DP mode. The BK3520 incorporates the PROFIBUS DP V1 services.

System data PROFIBUS | BK3520
Number of I/O stations 100 with repeater
Number of I/O points approx. 6,000, depending on the master
Data transfer medium APF (plastic) fibre (1,000 µm)
Max. cable length 40 m between two stations
Data transfer rates up to 12 Mbaud
Technical data BK3520
Number of Bus Terminals 64 (255 with K-bus extension)
Max. number of bytes fieldbus 128 byte input and 128 byte output
Digital peripheral signals 1,020 inputs/outputs
Analog peripheral signals 64 inputs/outputs
Data transfer rates automatic detection up to 12 Mbaud
Bus interface 4 x HP-Simplex sockets (HP-Simplex plugs ZS1031-3500 included)
Topology line topology
Data transfer medium APF (plastic) fibre (1,000 µm)
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 500 mA max.
Current supply K-bus 1750 mA
Power contacts max. 24 V DC/max. 10 A
Electrical isolation 500 V (power contact/supply voltage/fieldbus)
Distance between stations 40 m
Weight approx. 170 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals/markings CE, UL, ATEX
Ex marking II 3 G Ex nA IIC T4 Gc
Accessories/related products  
KS2000 configuration software for extended parameterisation
Cordsets cordsets and connectors
FC310x PC Fieldbus Cards with PCI interface
BK3100 PROFIBUS DP/FMS Bus Coupler for up to 64 Bus Terminals, 12 Mbaud
BK3120 PROFIBUS “Economy plus” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension), 12 Mbaud
BK3150 PROFIBUS “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension), 12 Mbaud
BC3100 PROFIBUS Bus Terminal Controller for up to 64 Bus Terminals, 12 Mbaud
BC3150 PROFIBUS “Compact“ Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension), 12 Mbaud
BX3100 PROFIBUS Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension), 12 Mbaud
CX8030 PROFIBUS Embedded PC, master
CX8031 PROFIBUS Embedded PC, slave
System  
PROFIBUS For further PROFIBUS products please see the system overview