BK3120 | PROFIBUS Economy plus Bus Coupler

 Bus Couplers  PROFIBUS DP

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

Number of Bus Terminals: 64 (255 with K-bus extension)

Max. number of bytes fieldbus: 128 byte input and 128 byte output

Data transfer rates: automatic detection up to 12 Mbaud

Bus interface: 1 x D-sub 9-pin socket with shielding

Data transfer medium: shielded copper cable, 2 x 0.25 mm²

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)

Weight: approx. 170 g

Operating/storage temperature: -25…+60 °C/-40…+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, DNV GL, cFMus

Ex marking:  ATEX: II 3 G Ex ec IIC T4 Gc

IECEx: Ex ec IIC T4 Gc

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