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BK9500 | Universal Serial Bus (USB) Bus Coupler

The Bus Coupler BK9500 connects the Universal Serial Bus (USB) system with the electronic terminal blocks, which can be extended in modular fashion. One unit consists of one Bus Coupler, any number from 1 to 64 terminals and one end terminal.

The Bus Coupler recognises the connected Bus Terminals and automatically generates the affiliations of the inputs/outputs to the bytes of the process image. The first input/output signal is inserted in the first bit of one word (LSB), beginning from the left. The Bus Coupler inserts further signals in this word. Inputs and outputs are clearly separated. The Bus Coupler automatically begins a further word if the number of inputs or outputs exceeds 16 bits.

Universal Serial Bus is the new standard for transmitting signals between a PC and the PC periphery (e.g. cameras, keypads, input devices). The USB involves serial data transmission. The high baud rate and the short data cables make the USB bus suitable for data acquisition in measuring systems and for the construction of laboratory applications. The connection to the fast periphery bus is achieved over the standardised USB plug. The peripheral devices are arranged with the aid of distribution hubs, with which a bus system with a maximum of 127 devices can be constructed. The data transmission is divided into what are known as frames, each with a duration of 1 ms. One frame can therefore contain up to 1,500 bytes of data. Some of this data is required for the protocol and for control information, so that in the worst case about 1,100 bytes of user data are available in each frame. The data is transmitted over twisted pair wires. The maximum extension of the bus system is 30 metres.

Starting from TwinCAT 2.8 a USB driver is available.

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

The BK9500 Bus Coupler supports the operation of all Bus Terminal types. 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) handle 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 carries out the desired setting automatically after switching on.

System data  
Number of I/O stations 127
Number of I/O points depending on controller
Data transfer medium 1 x 2 twisted pair (28 AWG) copper cable, 1 x 2 power supply
Distance between stations 30 m, 5 m from BK9500 to BK9500
Data transfer rates 12 Mbaud



Technical data  
Number of Bus Terminals 64
Max. number of bytes fieldbus 512 byte input and 512 byte output
Digital peripheral signals 512 inputs/outputs
Analog peripheral signals 256 inputs/outputs
Configuration possibility via KS2000
Data transfer rates 12 Mbaud
Bus interface 1 x B type (upstream), 3 x A type (downstream)
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 (less downstream current)
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, UL, Ex



KS2000 configuration software for extended parameterisation
Cordsets cordsets and connectors



Ordering information  
BK9500 USB Bus Coupler for up to 64 Bus Terminals