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BX9000 | Ethernet TCP/IP Bus Terminal Controller


The BX9000 Bus Terminal Controller has an Ethernet slave/master interface. The controller has automatic baud rate detection up to 100 Mbaud. The address can optionally be entered via DHCP, BootP, ARP or with the joystick switch. Up to 2 kbytes of input and 2 kbytes of output can be exchanged with the controller. The ModbusTCP and the ADS/TCP and ADS/UDP protocols are implemented.

One unit consists of the BX9000 Bus Terminal Controller with up to 64 Bus Terminals and a bus end terminal. With the terminal bus extension system, the connection of up to 255 Bus Terminals is possible.

The controller is programmed via the COM1 or via the Ethernet interface. In terms of their equipment and performance, the BX series Bus Terminal Controllers are positioned between the BC series Bus Terminal Controllers and the CX series Embedded PCs. The main features distinguishing BC and BX are the larger memory and the expanded interfaces of the BX. Additionally, two serial interfaces are integrated for programming and for the connection of further serial devices. The device itself comprises an illuminated LC display with two lines of 16 characters each, a joystick switch and a real-time clock. Further peripheral devices, e.g. displays, can be connected via the integrated Beckhoff Smart System Bus (SSB).

Controller for distributed signal processing

Like for all other Beckhoff controllers, the TwinCAT automation software is the basis for parameterisation and programming. The BX devices are programmed according to the powerful IEC 61131-3 standard in the programming languages IL, FBD, LD, SFC or ST. Users therefore have the familiar TwinCAT tools available, e.g. the PLC programming interface, the System Manager and TwinCAT Scope. Data is exchanged optionally via the serial port (COM1) or via the Ethernet interface.

The configuration is also carried out using TwinCAT. The fieldbus interface, the SSB bus and the real-time clock can be configured and parameterised via the System Manager. The System Manager can read all connected devices and Bus Terminals. After the parameterisation, the configuration is saved on the BX via the serial interface and can be accessed again later.


PLC data 
Programming via TwinCAT and programming interface or Ethernet
Program memory 256 kbytes
Data memory 256 kbytes
Remanent data 2 kbytes
Persistent data 1 kbyte
Runtime system 1 PLC task
PLC cycle time approx. 1 ms for 1,000 instructions (without I/O cycle, K-bus)
Programming languages IEC 61131-3 (IL, LD, FBD, SFC, ST)
Online change yes
Up/down load code yes/yes



Technical data 
Number of Bus Terminals 64 (255 with K-bus extension)
Max. number of bytes fieldbus 512 byte input and 512 byte output
Max. number of bytes process image 2,048 byte input and 2,048 byte output
Digital peripheral signals 2,040 inputs/outputs
Analog peripheral signals 512 inputs/outputs
Protocol TwinCAT ADS, Modbus TCP
Data transfer rates 10/100 Mbaud, automatic recognition of the transmission rate
Bus interface RJ 45
Serial interface COM1: 1 x RS232, COM2: 1 x RS232 or RS485
SSB CANopen-based subsidiary bus system for the connection of further peripheral devices
Diagnostics LED 2 x power supply, 2 x K-bus
Display FSTN display with 2 x 16 characters for diagnosis or own texts, illuminated
Switch joystick switch for parameterisation and diagnosis
Clock battery-powered real-time clock for time and date
Power supply 24 V DC (-15 %/+20 %)
Input current 140 mA + (total K-bus current)/4, 500 mA max.
Starting current 2.5 x continuous current
Current supply K-bus 1,450 mA
Power contacts 24 V DC max./10 A max.
Electrical isolation 500 V (power contact/supply voltage)
Weight approx. 250 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



TwinCAT PLC programming system conforms to IEC 61131-3
FC90xx-00xx PC Fieldbus Cards with PCI interface



Ordering information 
BX9000 Ethernet Bus Terminal Controller for up to 64 Bus Terminals (255 with K-bus extension)
BK9xx0 Ethernet Bus Coupler
CX8090 Ethernet Embedded PC