BK7350 | Modbus Bus Coupler
The BK7350 Compact Bus Coupler with compact housing connects the Modbus bus system to the modular, extendable electronic terminal blocks. One unit consists of one Bus Coupler, any number from 1 to 64 terminals and one end terminal. With the K-bus extension, up to 255 Bus Terminals can be connected.
The Bus Coupler recognizes the terminals to which it is connected, and performs the assignment of the inputs and outputs to the words of the process image automatically. The first input/output signal will be added to the first bit of a word (LSB), beginning from the left. The Bus Coupler adds further signals to the word. A clear separation is maintained between inputs and outputs. If the number of inputs or outputs is greater than 16 bits, the Bus Coupler automatically begins a new word.
Modbus has a line topology based on the RS485 interface. The Modbus protocol is published. The BK7350 supports the RTU and ASCII protocols. The baud rate is variable and can be set directly via the rotary selection switch on the Bus Coupler, i.e. without configuration software.
The Modbus Bus Coupler supports various Modbus functions that enable direct access to digital and analog signals. The BK7350 also supports the diagnostic Modbus function that enables faults to be detected and counted. In addition, the Bus Coupler diagnoses faulty or erroneous telegrams and respond to the controller with an error. The BK7350 enables broadcast access, which means that several Bus Couplers can be addressed simultaneously with a single telegram.
|Number of Bus Terminals||64 (255 with K-bus extension)|
|Max. number of bytes fieldbus||512 byte input and 512 byte output|
|Digital peripheral signals||1,020 inputs/outputs|
|Analog peripheral signals||256 inputs/outputs|
|Configuration possibility||by rotary switch or KS2000|
|Protocol||RTU/ASCII (default: RTU)|
|Data transfer rates||150 baud…38,400 baud|
|Bus interface||D-sub 9-pin, RS485|
|Data transfer medium||screened, twisted copper cable 2 x 0.25 mm² (RS485)|
|Power supply||24 V DC (-15 %/+20 %)|
|Input current||320 mA max.|
|Starting current||2.5 x continuous current|
|Recommended fuse||≤ 10 A|
|Current supply K-bus||1750 mA|
|Power contacts||max. 24 V DC/max. 10 A|
|Electrical isolation||500 V (power contact/supply voltage/fieldbus)|
|I/O communication types||read/write access, optionally bit oriented or word oriented|
|Weight||approx. 100 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|
|Ex marking||ATEX: II 3 G Ex ec IIC T4 Gc|
IECEx: Ex ec IIC T4 Gc
|Housing data||BKxx50, BCxx50|
|Design form||compact terminal housing with signal LEDs|
|Dimensions (W x H x D)||44 mm x 100 mm x 68 mm|
|Installation||on 35 mm DIN rail, conforming to EN 60715 with lock|
|Side by side mounting by means of||double slot and key connection|
|Marking||labeling of the BZxxx series|
|Wiring||solid conductor (s), flexible conductor (st) and ferrule (f): spring actuation by screwdriver|
|Connection cross-section||s*: 0.08…2.5 mm², |
st*: 0.08…2.5 mm²,
f*: 0.14…1.5 mm²
|Stripping length||8…9 mm|
|Current load power contacts||Imax: 10 A|
*s: solid wire; st: stranded wire; f: with ferrule
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