DeviceNet “Compact” Bus Coupler BK5250
Status display
power LEDs
Bus Coupler
Input for
power contacts
Power contacts
Fieldbus connection
Address selector
Configuration interface
Address selector
extended temperature range

BK5250 | DeviceNet “Compact” Bus Coupler

DeviceNetThe “Compact” Bus Coupler BK5250 for DeviceNet extends the Beckhoff Bus Terminal system by a cost-optimized version in a compact housing. Up to 64 Bus Terminals are supported; with the terminal bus extension, up to 255 Bus Terminals can be connected. The DeviceNet Bus Coupler offers automatic baud rate detection up to 500 kbaud and two address selection switches for address assignment. A 5-pin connector for the fieldbus connection is included in the scope of supply. Optionally, the ZS1052-3000 connector with integrated terminating resistor can be connected.

System data DeviceNet | BK5250
Number of I/O stations 64
Data transfer medium screened, twisted copper wire with power supply, 5-pin
Max. cable length
500 m 250 m 100 m
Data transfer rates
125 kbaud 250 kbaud 500 kbaud
Operating modes bit strobe, polling, cyclic, change of state (COS)
DeviceNet type communications adapter
Technical data BK5250
Number of Bus Terminals 64 (255 with K-bus extension)
Max. number of bytes fieldbus 512 byte input and 512 byte output
Digital peripheral signals 1,020 inputs/outputs
Analog peripheral signals 256 inputs/outputs
Configuration possibility via KS2000 or the controller
Data transfer rates automatic detection
Bus interface 1 x open pluggable connector, 5-pin, included
Power supply 24 V DC (-15 %/+20 %), through bus cable 11…25 V (conforms to DeviceNet specification)
Serial interface configuration interface
Diagnostics LED 2 x power supply, 2 x K-bus, 2 x fieldbus
Current supply K-bus 1750 mA
Power contacts max. 24 V DC/max. 10 A
Electrical isolation 500 V (power contact/supply voltage Bus Coupler)
Weight approx. 100 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
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
FC5201 | FC5202 DeviceNet PCI fieldbus cards
BK5200 DeviceNet Bus Coupler for up to 64 Bus Terminals
BK5220 DeviceNet “Economy plus” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BX5200 DeviceNet Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension)
DeviceNet For further DeviceNet products please see the system overview