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BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

Power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus signal input 1
Fieldbus signal output 1
Configuration interface
Fieldbus signal input 2
Fieldbus signal output 2
Address selector
Address selector
BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

BK3520 | PROFIBUS Economy plus Bus Coupler, fiber optic

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.

Product status:

regular delivery

Product information

Technical dataBK3520
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus128 byte input and 128 byte output
Digital peripheral signals1,020 inputs/outputs
Analog peripheral signals64 inputs/outputs
Data transfer ratesautomatic detection up to 12 Mbaud
Bus interface4 x HP-Simplex sockets (HP-Simplex plugs ZS1031-3500 included)
Data transfer mediumAPF (plastic) fiber (1,000 µm)
Power supply24 V DC (-15 %/+20 %)
Input current70 mA + (total K-bus current)/4, 500 mA max.
Current supply K-bus1750 mA
Power contactsmax. 24 V DC/max. 10 A
Electrical isolation500 V (power contact/supply voltage/fieldbus)
Topologyline topology
Distance between stations40 m
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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