BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

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BRAND: BECKHOFF

CODE: BK3520

PRODUCT NAME: Lightbus Bus Coupler

SUPPLIER: SUNLY

Description
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The BK3520 Economy plus Bus Coupler links a fiber optic PROFIBUS system to the modular, extendable electronic Bus Terminal system. With the K-bus extension technology up to 255 spatially distributed Bus Terminals can be connected to one Bus Coupler.

The particular feature for the BK3520 Bus Coupler is its fiber optic connection and its high transmission rate of up to 12 Mbaud. The fiber optic link guarantees that the transmission is free from electromagnetic interference and provides full electrical isolation.

An interface-module is necessary to translate between the physical properties of RS485 to those of an underlying optical fiber ring. The topology corresponds with the RS485 physics (line topology). For this reason, the BK3520 possesses two transmitters and two receivers. The address is set by the address selection switch. The baud rate is automatically recognized. Baud rates of up to 12 Mbaud are supported, so that the transmission speed can be adapted to meet the needs of the particular technical process.

The Economy plus Bus Coupler has been designed to accommodate automation requirements. PROFIBUS protocols omit FMS operation in order to be able to transfer more user data in DP mode. The BK3520 incorporates the PROFIBUS DP V1 services.

BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

Number of Bus Terminals	64 (255 with K-bus extension)
Max. number of bytes fieldbus	128 byte input and 128 byte output
Digital peripheral signals	1,020 inputs/outputs
Analog peripheral signals	64 inputs/outputs
Data transfer rates	automatic detection up to 12 Mbaud
Bus interface	4 x HP-Simplex sockets (HP-Simplex plugs ZS1031-3500 included)
Data transfer medium	APF (plastic) fiber (1,000 µm)
Power supply	24 V DC (-15 %/+20 %)
Input current	70 mA + (total K-bus current)/4, 500 mA max.
Current supply K-bus	1750 mA
Power contacts	max. 24 V DC/max. 10 A
Electrical isolation	500 V (power contact/supply voltage/fieldbus)
Topology	line topology
Distance between stations	40 m
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. 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