EtherCAT® Bus Coupler

The EtherCAT® Bus Coupler connects the real-time Ethernet system with modular, extendable electronic terminal blocks. A complete unit consists of a bus coupler, a set of bus terminals and one end terminal.

Contact Us
Contact Us

The ETHERCAT Coupler connects EtherCAT, the real-time Ethernet system, with the modular, extendable electronic terminal blocks. A unit consists of a Bus Coupler, a set of terminals, and one end terminal.

The Bus Coupler recognises the connected Bus Terminals and automatically allocates them into the EtherCAT process image. The Bus Coupler is connected to the network via the upper Ethernet interface. The lower RJ 45 socket may be used to connect further EtherCAT devices in the same strand.

In the EtherCAT network, the ETHERCAT Coupler can be installed anywhere in the Ethernet signal transfer section (100BASE-TX) – except directly at the switch.

EtherCAT (Ethernet Control Automation Technology) is the Ethernet solution for industrial automation, characterized by outstanding performance and particularly simple handling. EtherCAT enables the Ethernet star topology to be replaced with a simple line structure. Optionally, EtherCAT may also be wired in the “classic” way using switches, in order to integrate further Ethernet devices. The master requires no special plug-in card and can be implemented on any existing Ethernet controller using a very simple interface. EtherCAT is therefore also well suited to small and medium control applications, where it will also open up new areas of application for distributed I/Os.

For EtherCAT a separate I/O system in protection class IP 20 is available in the form of EtherCAT Terminals. In contrast to Bus Terminals, where the fieldbus signal is implemented within the Bus Coupler on the internal, fieldbus-independent terminal bus, the EtherCAT protocol remains fully intact down to the individual terminal.

The ETHERCAT 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 multifunctional Bus Terminals can be adapted to each specific application. Depending on the type, the analog Bus Terminals’ registers contain temperature ranges, gain values and linearisation characteristics. 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 Programmable Automation Controller (PAC) handles configuration of the complete periphery during the start up phase. If required, the controller can upload the decentralized 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.

 EtherCAT Specifications


System Data AKT-ECT-000-000
Number of I/O stations
Number of I/O points
depending on controller
Data transfer medium
Ethernet/EtherCAT CAT5 cable
Max. cable length
100 m (100BASE-TX)
Data transfer rates
100 Mbaud
Data transfer time
0.01 ms in the case of 10 modules for 32 bit inputs and outputs each (without Standard Bus run-time)


Electrical and Mechanical Specification AKT-ECT-000-000
Number of Bus Terminals
64 (255 with Standard Bus extension)
Max. number of bytes fi eldbus
1,024 byte input and 1,024 byte output
Configuration possibility
EtherCAT (ADS)
Bus interface
2 x RJ 45
Power supply
24 V DC (-15 %/+20 %)
Input current
70 mA + (total Standard Bus current) /4, 500 mA max.
Starting current
approx. 2.5 x continous current
Recommended fuse
≤ 10 A
Supply current Standard Bus
1,750 mA
Power contacts
24 V DC max./10 A max.
Electrical isolation
500 Vrms (power contact/supply voltage/Ethernet)
Distance between stations
100 m (100BASE-TX)
approx. 150 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 60068-2-27/29
EMC immunity/emission
conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos.
IP 20/variable

CAD Drawings

EtherCAT_Coupler_Drawing_Rev_1EtherCAT_Coupler_Drawing_Rev_198 KB2/15/2016Email
EtherCAT_Coupler_Drawing_Rev_1_(DWG)EtherCAT_Coupler_Drawing_Rev_1_(DWG)25.2 KB2/15/2016Email


EtherCAT_Coupler_Manual_en-us_Rev_1.2EtherCAT_Coupler_Manual_en-us_Rev_1.2401.5 KB8/14/2012Email

Data Sheet

EtherCAT_Coupler_Datasheet_en-us_Rev_AEtherCAT_Coupler_Datasheet_en-us_Rev_A243.5 KB8/14/2012Email
US Production