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BK4000, BK4010, BK4020 | Interbus Bus Couplers

The BK4000, BK4010 and BK4020 Bus Couplers connect the Interbus 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 BK4010 "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 BK4020 allows the connection of up to 255 spatially distributed Bus Terminals to one Bus Coupler. The “Economy plus” coupler supports all Beckhoff system Bus Terminals and can process 512 bit digital inputs and outputs per slave. The number of analog channels is limited by the Interbus protocol to a maximum of 32 input and 32 output channels. The transmission rate is 500 kbaud. Slave devices can be spaced up to 400 m from each other as the fieldbus interface acts as repeater. The overall length of an Interbus ring is limited to 13 km.

The identification code and the length code are determined by the Bus Coupler automatically after starting, depending upon the connected Bus Terminal, and are read out by the master. It is not necessary to parameterise the slave.

The Bus Coupler recognises the connected terminals and automatically generates the affiliations of the inputs/outputs to the bytes of the process image. The first input/output signal is inserted in the first bit of one word (LSB), beginning from the left. The Bus Coupler inserts further signals in this word. Inputs and outputs are clearly separated.

Interbus has been established as an open fieldbus system since 1987. Interbus has a ring structure, and up to 256 stations can be operated in a ring. Data transmission takes place at 500 kbaud. Due to the efficient data transmission, sensor and actuator data can be transferred over great distances.

Complex signal processing for analog I/Os, position measurement, …

The BK4000 and BK4020 Bus Couplers support the operation of all Bus Terminals. As far as the user is concerned, handling of the analog inputs/outputs is not different to other series. The information is available in the process image of the controller for processing in the form of a byte array.

The analog and multi-functional Bus Terminals can be adapted to each specific application using the KS2000 configuration set. Depending on the type, the analog Bus Terminals' registers contain temperature ranges, gain values and linearisation characteristics. With the KS2000, the required parameters can be set on a PC. The Bus Terminals store settings permanently and in a fail-safe manner.

Optionally, the Bus Terminals can also be controlled by the control system. Via function blocks (FBs), the programmable logic controller (PLC) or the Industrial PC (IPC) handles configuration of the complete periphery during the start-up phase. If required, the controller can upload the decentrally created configuration data in order to centrally manage and store this data. Therefore, new adjustments are not necessary in the event of replacement of a Bus Terminal. The controller automatically sets the required setting on power up. This functionality is achievable through the use of the KS2000 software.

The Interbus coupler works with the protocol chip SUPI3 and supports the extended diagnostics of the Interbus master. Byte-by-byte addressing in the master is supported as from generation G4.

System data Interbus | BK4000, BK4010, BK4020
Number of I/O stations 256
Number of I/O points 4,096
Data transfer medium LiYCY 3 x 2 x 0.22 mm²
Max. cable length max. 400 m
Data transfer rates 500 kbaud
Data transfer time approx. 1 ms in the case of 10 modules for 32 bit input and output each

Technical data BK4000 BK4010 BK4020
Number of Bus Terminals 64 64 64 (255 with K-bus extension)
Max. number of bytes fieldbus 64 byte input and 64 byte output 8 byte input and 8 bytes output 64 byte input and 64 byte output
Digital peripheral signals 512 inputs/outputs 64 inputs/outputs 512 inputs/outputs
Analog peripheral signals 32 inputs/outputs 32 inputs/outputs
Configuration possibility via KS2000
Data transfer rates 500 kbaud
Bus interface 2 x D-sub plug, 9-pin, plug and socket with screening and vibration lock
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 500 mA max. 70 mA + (total K-bus current)/4, 200 mA max. 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 1,750 mA 500 mA 1,750 mA
Power contacts 24 V DC max./10 A max.
Electrical isolation 500 V (power contact/supply voltage/fieldbus)
Weight approx. 170 g approx. 150 g approx. 170 g
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27/29
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE, UL, Ex

KS2000 configuration software for extended parameterisation
Cordsets cordsets and connectors

Ordering information Description
BK4000 Interbus Bus Coupler for up to 64 Bus Terminals
BK4010 Interbus Bus Coupler for up to 64 digital Bus Terminals
BK4020 Interbus “Economy plus” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)
BK4500 Interbus Bus Coupler with fibre optic connection for up to 64 Bus Terminals
BC4000 Interbus Bus Terminal Controller

Interbus For further Interbus products please see the system overview.