EtherNet/IP Bus Coupler BK9105
Power LEDs
Bus Coupler
Input for
power contacts
Power contacts
Address selector
Configuration interface
10/100 Mbaud
10/100 Mbaud
extended temperature range

BK9105 | EtherNet/IP Bus Coupler

EtherNet/IPThe BK9105 Bus Coupler connects EtherNet/IP with the modular, extendable electronic terminal blocks. One unit consists of one Bus Coupler, any number from 1 to 64 terminals (255 with K-bus extension) and one end terminal.

The Bus Coupler recognises the terminals to which it is connected, and performs the assignment of the inputs and outputs to the words of the process image automatically. The BK9105 Bus Coupler supports 10 Mbit/s and 100 Mbit/s Ethernet. Connection is through normal RJ45 connectors. The IP address is set on the DIP switch (offset to a freely selectable start address). In networks with DHCP (a service for the allocation of the logical IP address to the physical node address [MAC-ID]) the Bus Coupler obtains its IP address from the DHCP server.

The BK9105 contains a 3-port switch. Two ports operate external on RJ45 connectors and can be utilised. The I/O stations can thus be configured with a line topology, instead of the classic star topology. In many applications this significantly reduces the wiring effort and the cabling costs. The maximum distance between two couplers is 100 m. Up to 20 BK9105 Bus Couplers are cascadable, so that a maximum line length of 2 km can be achieved.

Ethernet/IP is the Industrial Ethernet standard of ODVA (Open DeviceNet Vendor Association). Ethernet/IP is based on Ethernet TCP/IP and UDP/IP – IP stands for Industrial Protocol. Essentially, the CIP (Common Industrial Protocol) used in ControlNet and DeviceNet was ported to Ethernet TCP/IP and UDP/IP.

System data EtherNet/IP | BK9105
Number of I/O stations only limited by IP addresses
Number of I/O points depending on controller
Data transfer medium 4 x 2 twisted pair copper cable; category 3 (10 Mbaud), category 5 (100 Mbaud)
Distance between stations 100 m between hub/switch and Bus Coupler or between Bus Coupler and Bus Coupler
Data transfer rates 10/100 Mbaud
Topology line or star wiring
Cascading up to 20 BK9105 or max. line length 2 km
Technical data BK9105
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 512 inputs/outputs
Analog peripheral signals 256 inputs/outputs
Protocol EtherNet/IP
Configuration possibility via KS2000
Data transfer rates 10/100 Mbaud, automatic recognition of the transmission rate
Bus interface 2 x RJ45 (2-channel switch)
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 500 mA max.
Starting current 2.5 x continuous current
Recommended fuse ≤ 10 A
Current supply K-bus 1750 mA
Power contacts 24 V DC max./10 A max.
Electrical isolation 500 V (power contact/supply voltage/fieldbus)
Weight approx. 170 g
Operating/storage temperature -25…+60 °C/-40…+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 CE, UL, Ex, GL
KS2000 configuration software for extended parameterisation
Cordsets cordsets and connectors
FC9001-0010 | FC9011 Ethernet PCI fieldbus cards
Ordering information Description
BK9105 EtherNet/IP Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BK9105-1000 EtherNet/IP Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension), default IP address:
BK9055 EtherNet/IP “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BK9055-1000 EtherNet/IP “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension), default IP address:
CX8095 EtherNet/IP Embedded PC
Further information  
EtherNet/IP EtherNet/IP solutions in IP 20 and IP 67