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Beckhoff Automation (Pty) Ltd

7 Ateljee Street
Randpark Ridge, Randburg
Gauteng
2169, South Africa

+27 11 795 2898
info@beckhoff.co.za
www.beckhoff.com/en-za/

BK3120 | PROFIBUS Economy plus Bus Coupler

Image similar, may contain optional accessories
BK3120 | PROFIBUS Economy plus Bus Coupler

BK3120 | PROFIBUS Economy plus Bus Coupler

Power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus connection
Address selector
Configuration interface
Address selector
BK3120 | PROFIBUS Economy plus Bus Coupler

BK3120 | PROFIBUS Economy plus Bus Coupler

The Economy plus version extends the existing PROFIBUS Bus Coupler series BK3xx0. The K-bus extension technology allows the connection of up to 255 spatially distributed Bus Terminals to one Bus Coupler. The BK3120 has been designed to accommodate automation requirements. The PROFIBUS protocols omit FMS operation in order to be able to transfer more user data in DP mode, which for this Bus Coupler type can be 128 byte inputs and 128 byte outputs. The BK3120 incorporates the PROFIBUS DP V1 services. These services allow direct access to the Bus Coupler register and the complex Bus Terminals in order, for example, to change the parameterization or to set/correct limit values for analog Bus Terminals.

Baud rates of up to 12 Mbaud are automatically recognized by the Bus Coupler, allowing the transmission speed to be adapted to meet the needs of the particular technical process.

Product status:

regular delivery

Product information

Technical dataBK3120
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus128 byte input and 128 byte output
Data transfer ratesautomatic detection up to 12 Mbaud
Bus interface1 x D-sub 9-pin socket with shielding
Data transfer mediumshielded copper cable, 2 x 0.25 mm²
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)
Weightapprox. 170 g
Operating/storage temperature-25…+60°C/-40…+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, DNV GL, cFMus
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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