BK4000, BK4020 | Interbus Bus Couplers

The BK4000 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.

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.

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, 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	BK4020
Number of Bus Terminals	64	64 (255 with K-bus extension)
Max. number of bytes fieldbus	64 byte input and 64 byte output
Digital peripheral signals	512 inputs/outputs
Analog peripheral signals	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.
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	0…+55 °C/-25…+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

1980년에 독일 Verl에서 설립된 Beckhoff Automation Gmbh & Co.KG는 설립이후 지금까지 일관되게 PC 기반 제어 솔루션을 세계 시장에 공급하고 있는 회사로, 전 세계 75개국에 지사을 두고 있으며, 2018년 기준으로 9억1천6백만 유로의 매출과 전 세계에 걸쳐 4,300명의 직원을 채용하고 있는 회사이다. Beckhoff Automation Gmbh & Co. KG에서 공급하고 있는 PC 기반 제어 솔루션은 크게 다음과 같은 네 가지 제품군을 기반으로 하고 있다. Beckhoff 본사가 있는 독일 Verl에서 생산되어 전 세계로 공급되고 있는 Beckhoff Industrial PC/Embedded PC 및 Control Panel은 2017년 한 해 동안에만 수십만 대가 판매되었다. 이러한 수량이 판매되어 전 세계의 다양한 산업현장에서 사용될 수 있는 것은 1) 컴퓨터 시스템 BIOS와 Motherboard의 개발, 설계 및 생산을 내재화 해서 시스템의 안정성 확보 2) 저 성능의 ARM CPU 기반 제품부터 고성능의 Intel Xeon CPU 기반 제품까지, 각 산업별 고객의 요구에 맞는 성능의 제품을 공급할 수 있는 확장성 제공 3) 소형 사이즈(71 mm X 100 mm X 73 mm) Embedded PC부터 대형 사이즈(410 mm X 480 mm X 201 mm) Industrial Server까지 산업 현장의 상황에 맞게 제품을 선택할 수 있는 다양성 제공 4) Windows OS와 함께 운용되는 Real-time kernel 기반의 TwinCAT 2/ TwinCAT 3 Software package에 최적화된 Industrial PC/Embedded PC 이기 때문이다.