BK2020 | Lightbus Bus Coupler

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BRAND: BECKHOFF

CODE: BK2020

PRODUCT NAME: Lightbus Bus Coupler

SUPPLIER: SUNLY

Description
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The BK2020 Economy plus Bus Coupler connects the Lightbus system to the electronic terminal blocks, which can be expanded 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 BK2020 allows the connection of up to 255 spatially distributed Bus Terminals to one Bus Coupler. The Economy plus series supports all Beckhoff system Bus Terminals. It can process in its full configuration 1020 digital signals and a maximum of 128 analog input and output channels per slave.

The Bus Coupler recognizes 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 byte (LSB), beginning from the left. The Bus Coupler inserts further signals in this byte. Inputs and outputs are clearly separated. The Bus Coupler automatically begins a further byte if the number of inputs or outputs exceeds 8 bits.

The Lightbus System is a rapid and safe serial fieldbus system. The Lightbus has a ring structure; up to 254 stations can be operated in a ring. Easy-to-operate standard fiber optic technology is used for data transmission, which represents excellent value. Thanks to an optimized, efficient telegram structure, the Lightbus achieves a very high user data transmission rate. For the exchange of 32 bit information 25 µs transmission time is required.

Thanks to the high-speed access method employed by the Lightbus, it is possible to access specific peripheral data and to read or write the required data only. Data is exchanged with the required priorities without producing any overhead. BK2020 | Lightbus Bus Coupler

Number of Bus Terminals	64 (255 with K-bus extension)
Max. number of bytes fieldbus	512 byte input and 512 byte output
Digital peripheral signals	1,020 inputs/outputs
Analog peripheral signals	128 inputs/outputs
Configuration possibility	via KS2000 or the controller
Data transfer rates	2.5 Mbaud
Bus interface	2 x standard fiber-optic connector Z1000 (plastic fiber), Z1010 (HCS fiber)
Data transfer medium	fiber-optic conductor: APF (plastic) fiber (1,000 µm) or HCS fiber (200 µm)
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)
Distance between stations	45 m for APF fiber, 300 m HCS fiber
Data transfer time	0.26 ms in the case of 10 modules for 32 bit inputs and outputs each (without K-bus run-time)
Weight	approx. 150 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. rating/installation pos.	IP20/variable
Approvals/markings	CE, UL, ATEX, IECEx
Ex marking	ATEX: II 3 G Ex ec IIC T4 Gc IECEx: Ex ec IIC T4 Gc