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BK7520 | SERCOS II Bus Coupler

BK7520 | SERCOS II Bus Coupler

BK7520 | SERCOS II Bus Coupler

Power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus signal input
Fieldbus signal output
Configuration interface
Baud rate
Transmit intensity
Address selector
BK7520 | SERCOS II Bus Coupler

BK7520 | SERCOS II Bus Coupler

The BK7520 Bus Coupler connects the SERCOS bus system with the electronic terminal blocks, which can be extended in modular fashion. One unit consists of one Bus Coupler, any number from 1 to 64 terminals and one end terminal. The BK7520 allows, with the K-bus extension technology, the connection of up to 255 Bus Terminals to one Bus Coupler. The Bus Coupler recognizes the connected terminals and automatically generates the affiliations of the inputs/outputs to the bytes of the process image.

SERCOS is a fiber optic bus that was developed for use in drive technology as a digital drive interface for drives. SERCOS is an open fieldbus system, which since 1995 has been subject to the international standard IEC 61491 for numerically controlled machines. It is widely used in the drive technology sector.

The bus consists of a master and of a number of slaves. In SERCOS, most of the slaves are drive amplifiers. The bus topology is a ring system, in which it is possible to operate up to 254 stations. The transmission speed is 2 and 4 Mbaud. The BK7520 supports additionally 8 and 16 Mbaud. There are basically three types of telegrams. The master SYNC telegram is received by all the slaves at the same time, and is used for synchronization. The master data telegram is also received by all the slaves, and contains the cyclic data and the service data. The slaves send their data in what is known as a drive telegram.

Parameterization can also be carried out via the SERCOS interface.

Product status:

regular delivery

Product information

Technical dataBK7520
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus254 word I/O for the cyclic interface (depending on the master)
Digital peripheral signals1,020 inputs/outputs
Analog peripheral signals254 inputs/outputs
Configuration possibilityvia KS2000
Data transfer rates2/4/8/16 Mbaud, adjustable by means of configuration switch
Bus interfaceFSMA standard, IEC 872-2
Data transfer medium1,000 µm plastic fiber optic
Power supply24 V DC (-15%/+20%)
Input current70 mA + (total K-bus current)/4, 500 mA max.
Starting current2.5 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/fieldbus)
Distance between stations40 m plastic fiber optic
Weightapprox. 170 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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