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BK7420 | Fipio “Economy plus” Bus Coupler

The BK7420 Bus Coupler links the Fipio bus system to the modular, extendable electronic terminal blocks. One unit consists of a Bus Coupler, any number of Bus Terminals between 1 and 64, and up to 255 terminals with the K-bus extension. The Bus Coupler automatically recognises the connected terminals and activates the relevant transfer profile.

The Fipio fieldbus corresponds to the WorldFIP standard and is disclosed via the Schneider Alliances partner program. The typical number of participating devices is 32 per segment for the electrical connection; up to four segments with repeaters are permitted. The address is set via two hexadecimal address switches. The maximum baud rate for the communication with the Bus Coupler is 1 Mbaud. The Bus Coupler automatically detects the rate. The fieldbus connection is established via a 9-pin D-sub socket.

Complex signal processing for analog I/Os, position measurement, …

The BK7420 Bus Coupler supports the operation of all Bus Terminals. As far as the user is concerned, handling of the analog inputs/outputs is not different to other series. The information is available in the process image of the controller for processing in the form of a byte array.

The analog and multi-functional Bus Terminals can be adapted to each specific application using the KS2000 configuration set. Depending on the type, the analog Bus Terminals' registers contain temperature ranges, gain values and linearisation characteristics. With the KS2000, the required parameters can be set on a PC. The Bus Terminals store settings permanently and in a fail-safe manner.

Optionally, the Bus Terminals can also be controlled by the control system. Via function blocks (FBs), the programmable logic controller (PLC) or the Industrial PC (IPC) handles configuration of the complete periphery during the start-up phase. If required, the controller can upload the decentrally created configuration data in order to centrally manage and store this data. Therefore, new adjustments are not necessary in the event of replacement of a Bus Terminal. The controller automatically sets the required setting on power up.


System data  
Number of I/O stations 256
Number of I/O points depending on the master
Data transfer medium shielded, twisted two-wire cable (150 Ω characteristic impedance)
Max. cable length 1,000 m without amplifier
Data transfer rates 1 Mbaud
Transfer profile automatic switching FRD (4 bytes), FSD (16 bytes) and FED (64 bytes)



Technical data  
Number of Bus Terminals 64 (255 with K-bus extension)
Max. number of bytes fieldbus 64 byte input and 64 byte output
Digital peripheral signals 512 inputs/outputs
Analog peripheral signals 32 inputs/outputs
Configuration possibility via KS2000
Data transfer rates automatic detection up to max. 1 Mbaud
Bus interface 1 x D-sub 9-pin socket with shielding
Power supply 24 V DC (-15 %/+20 %)
Input current 70 mA + (total K-bus current)/4, 500 mA max.
Starting current 2.5 x continuous current
Recommended fuse ≤ 10 A
Current supply K-bus 1,750 mA
Power contacts 24 V DC max./10 A max.
Electrical isolation 500 V (power contact/supply voltage/fieldbus)
Weight approx. 170 g
Operating/storage temperature 0…+55 °C/-25…+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. class/installation pos. IP 20/variable
Approvals CE, Ex



KS2000 configuration software for extended parameterisation
Cordsets cordsets and connectors



Ordering information  
BK7420 Fipio “Economy plus” Bus Coupler for up to 64 Bus Terminals (255 with K-bus extension)