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BK7350 | Modbus Bus Coupler

BK7350 | Modbus Bus Coupler

BK7350 | Modbus Bus Coupler

Status display
fieldbus,
power LEDs
K-bus
Bus Coupler
supply
Input for
power contacts
Power contacts
Fieldbus connection
Address selector
Configuration interface
Address selector
BK7350 | Modbus Bus Coupler

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.

Product status:

regular delivery

Product information

Technical dataBK7350
Number of Bus Terminals64 (255 with K-bus extension)
Max. number of bytes fieldbus512 byte input and 512 byte output
Digital peripheral signals1,020 inputs/outputs
Analog peripheral signals256 inputs/outputs
Configuration possibilityby rotary switch or KS2000
ProtocolRTU/ASCII (default: RTU)
Data transfer rates150 baud…38,400 baud
Bus interfaceD-sub 9-pin, RS485
Data transfer mediumscreened, twisted copper cable 2 x 0.25 mm² (RS485)
Power supply24 V DC (-15%/+20%)
Input current320 mA max.
Starting current2.5 x continuous current
Recommended fuse≤ 10 A
Current supply K-bus1750 mA
Power contactsmax. 24 V DC/max. 10 A
Electrical isolation500 V (power contact/supply voltage/fieldbus)
I/O communication typesread/write access, optionally bit oriented or word oriented
Weightapprox. 100 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
Ex markingATEX: II 3 G Ex ec IIC T4 Gc
IECEx: Ex ec IIC T4 Gc
Housing dataBKxx50, BCxx50
Design formcompact terminal housing with signal LEDs
Materialpolycarbonate
Dimensions (W x H x D)44 mm x 100 mm x 68 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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