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Beckhoff Automation Pty. Ltd.

Building 4, 163–179 Forster Road
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www.beckhoff.com/en-au/

BK2000 | Lightbus Bus Coupler

BK2000 | Lightbus Bus Coupler

BK2000 | Lightbus Bus Coupler

Power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus signal input
Fieldbus signal output
Configuration interface
BK2000 | Lightbus Bus Coupler

BK2000 | Lightbus Bus Coupler

The BK2000 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.

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.

Product status:

regular delivery (not recommended for new projects) | recommended alternative: BK2020

Product information

Technical dataBK2000
Number of Bus Terminals64
Max. number of bytes fieldbus512 byte input and 512 byte output
Digital peripheral signals512 inputs/outputs
Analog peripheral signals128 inputs/outputs
Configuration possibilityvia KS2000 or the controller
Data transfer rates2.5 Mbaud
Bus interface2 x standard fiber-optic connector Z1000 (plastic fiber), Z1010 (HCS fiber)
Data transfer mediumfiber-optic conductor: APF (plastic) fiber (1,000 µm) or HCS fiber (200 µm)
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)
Distance between stations45 m for APF fiber, 300 m HCS fiber
Data transfer time0.26 ms in the case of 10 modules for 32 bit inputs and outputs each (without K-bus run-time)
Weightapprox. 150 g
Operating/storage temperature0…+55 °C/-25…+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
Materialpolycarbonate
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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