CANopen Bus Couplers BK5110, BK5120
Power LEDs
Bus Coupler
Input for
power contacts
Power contacts
Fieldbus connection
Address selector
Configuration interface
extended temperature range

BK5110, BK5120 | CANopen Bus Couplers

CANopenThe BK51x0 Bus Couplers connect the CAN bus system to the electronic terminal blocks, which can be extended in modular fashion. One unit consists of one Bus Coupler, any number of up to 64 terminals and one end terminal. The BK5110 “Economy” variant permits particularly economical creation of peripheral interfacing connections. Up to 64 digital input/output terminals can be connected.

With the K-bus extension technology, the “Economy plus” Bus Coupler BK5120 allows the connection of up to 255 spatially distributed Bus Terminals to one Bus Coupler. The Bus Coupler works on the CAN protocol basis as defined in ISO 11898. In addition to network services, CANopen also determines the data allocation for automation systems applications and has established itself as an open CAN application layer. The Bus Couplers support all types of CANopen communications and can also be used without difficulty in manufacturer-specific CAN environments due to the simple structure of this protocol definition. The firmware can be updated via the configuration interface.

Parameterising can also be carried out using any CANopen configuration tools. For this, EDS data files are available, which describe all the setting options for the CANopen coupler. For most applications, however, no configuration is necessary, as CANopen provides practical default values for all parameters.

System data CANopen | BK5110, BK5120
Number of I/O stations 64 (BK5120: 255 with K-bus extension)
Number of I/O points depends on the structure
Data transfer medium screened, twisted copper cable, 2 x signal, 1 x ground (recommended)
Max. cable length
5,000 m 2,500 m 1,000 m 500 m 250 m 100 m 40 m
Data transfer rates
10 kbaud 20 kbaud 50 kbaud 100/125 kbaud 250 kbaud 500 kbaud 1,000 kbaud
PDO modes synchron, cyclic, event driven, polling
Technical data BK5110 BK5120
Number of Bus Terminals 64 64 (255 with K-bus extension)
Max. number of bytes fieldbus 5 Tx/Rx PDOs 16 Tx/Rx PDOs
Digital peripheral signals 256 inputs/outputs 960 inputs/outputs
Analog peripheral signals 60 inputs/outputs
Configuration possibility via KS2000 or the controller
Number of PDOs (CANopen) 5 Tx/5 Rx 16 Tx/16 Rx
Additional CANopen features life, node guarding, emergency object, variable mapping, store/restore
Data transfer rates up to 1 Mbaud
Bus interface 1 x open style connector, 5-pin, included
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 200 mA max. 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 500 mA 1750 mA
Power contacts 24 V DC max./10 A max.
Electrical isolation 500 V (power contact/supply voltage Bus Coupler)
Weight approx. 130 g approx. 150 g
Operating/storage temperature 0…+55 °C/-25…+85 °C -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
FC5101 | FC5102 CANopen PCI fieldbus cards
Ordering information Description
BK5110 CANopen Coupler for up to 64 digital Bus Terminals
BK5120 CANopen “Economy plus” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BK5150 CANopen “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BK5151 CANopen “Compact” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
LC5100 CANopen “Low Cost” Bus Coupler for up to 64 digital Bus Terminals (255 with K-bus extension)
BC5150, BX5100 CANopen “Compact” Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension)
CX8051 CANopen Embedded PC, slave
CANopen For further CANopen products please see the system overview