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BK1120 | EtherCAT Bus Coupler for standard Bus Terminals

BK1120 | EtherCAT Bus Coupler for standard Bus Terminals

BK1120 | EtherCAT Bus Coupler for standard Bus Terminals

Power LEDs
(Bus Terminal)
Bus Coupler
Input for
power contacts
Power contacts
Signal input EtherCAT
Link/Act In
Configuration and
programming interface
Signal output EtherCAT
Link/Act Out
BK1120 | EtherCAT Bus Coupler for standard Bus Terminals

BK1120 | EtherCAT Bus Coupler for standard Bus Terminals

The BK1120 EtherCAT Coupler is the link between the EtherCAT protocol at fieldbus level and the Bus Terminals. The coupler converts the passing telegrams from Ethernet 100BASE-TX to the internal, fieldbus-independent terminal bus. A station consists of a coupler and up to 64 Bus Terminals plus a bus end terminal. The process image of the EtherCAT system is assigned automatically. Up to 255 Bus Terminals can be connected via the K-Bus extension.


Special features:

  • Connection technology: 2 x RJ45 socket
  • Connection lengths: up to 100 m
  • connects the EtherCAT protocol with the Bus Terminals


The BK1120 has two RJ45 sockets. The upper Ethernet interface is used to connect the coupler to the network; the lower socket serves for the optional connection of further EtherCAT devices in the same segment.

The system and field supply, each 24 V DC, is provided directly at the coupler. The attached Bus Terminals are supplied with the current required for communication from the supplied system voltage. The field supply is forwarded to the individual I/O components via the power contacts with up to 10 A. In the EtherCAT network, the EK1120 coupler can be installed anywhere in the Ethernet signal transfer section (100BASE-TX) – except directly at the switch. The EK9000 and EK1000 couplers are suitable for use at the switch.

Product status:

regular delivery

Product information

Technical dataBK1120
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus1024 byte input and 1024 byte output
Configuration possibilityvia KS2000 or EtherCAT (ADS)
Data transfer rates100 Mbit/s
Bus interface2 x RJ45
Data transfer mediumEthernet/EtherCAT Cat.5 cable
Power supply24 V DC (-15%/+20%)
Input current70 mA + (total K-bus current)/4, 500 mA max.
Starting currentapprox. 2.5 x continuous current
Recommended fuse≤ 10 A
Current supply K-bus1750 mA
Power contactsmax. 24 V DC/max. 10 A
Electrical isolation500 V (power contact/supply voltage/Ethernet)
Distance between stations100 m (100BASE-TX)
Data transfer time0.01 ms in the case of 10 modules for 32 bit inputs and outputs each (without K-bus run-time)
Weightapprox. 150 g
Operating/storage temperature-25…+60°C/-40…+85°C
Relative humidity95%, no condensation
Vibration/shock resistanceconforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emissionconforms to EN 61000-6-2/EN 61000-6-4
Protect. rating/installation pos.IP20/variable
Approvals/markingsCE, UL, ATEX, IECEx
Ex markingATEX: II 3 G Ex ec IIC T4 Gc
IECEx: Ex ec IIC T4 Gc
Housing dataBKxxxx, BCxxxx
Design formcompact terminal housing with signal LEDs
Dimensions (W x H x D)51 mm x 100 mm x 69 mm
Installationon 35 mm DIN rail, conforming to EN 60715 with lock
Side by side mounting by means ofdouble slot and key connection
Markinglabeling of the BZxxx series
Wiringsolid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver
Connection cross-sections*: 0.08…2.5 mm²,
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
Stripping length8…9 mm
Current load power contactsImax: 10 A

*s: solid wire; st: stranded wire; f: with ferrule

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