EtherCAT Coupler for standard Bus Terminals BK1120, EtherCAT
Power LEDs
(Bus Terminal)
Input for
power contacts
Power contacts
Signal input EtherCAT
Link/Act In
Configuration interface
Signal output EtherCAT
Link/Act Out
extended temperature range
extended shock and vibration range 25g

BK1120 | EtherCAT Coupler for standard Bus Terminals

EtherCATThe BK1120 Bus Coupler connects EtherCAT with the K-bus components (KLxxxx) from the proven Beckhoff Bus Terminals range. One station consists of a BK1120 Bus Coupler, any number of terminals (up to 64; up to 255 with K-bus extension) and a bus end terminal. The Bus Coupler recognises the connected terminals and automatically allocates them into the EtherCAT process image. The Bus Coupler is connected to the network via the upper Ethernet interface. The lower RJ45 socket may be used to connect further EtherCAT devices in the same strand. In the EtherCAT network, the BK1120 Bus Coupler can be installed anywhere in the Ethernet signal transfer section (100BASE-TX) – except directly at the switch. The coupler BK9000 (for K-bus components) is suitable for installation at the switch.

Technical data BK1120
Task within EtherCAT system coupling of standard Bus Terminals (KLxxxx) to 100BASE-TX EtherCAT networks
Data transfer medium Ethernet/EtherCAT Cat.5 cable
Distance between stations 100 m (100BASE-TX)
Number of Bus Terminals 64 (255 with K-bus extension)
Max. number of bytes fieldbus 1024 byte input and 1024 byte output
Protocol EtherCAT
Data transfer rates 100 Mbaud
Configuration possibility via KS2000 or EtherCAT (ADS)
Bus interface 2 x RJ45
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 500 mA max.
Starting current approx. 2.5 x continuous current
Recommended fuse ≤ 10 A
Current supply K-bus 1750 mA
Power contacts max. 24 V DC/max. 10 A
Electrical isolation 500 V (power contact/supply voltage/Ethernet)
Weight approx. 150 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/markings CE, UL, ATEX
Ex-Marking II 3 G Ex nA IIC T4 Gc
Cordsets cordsets and connectors