AKT2G-ECT-000-000

EtherCAT Ethernet ofr Control Automation Technology. EtherCAT® is an open, high-performance Ethernet-based fieldbus system. The development goal of EtherCAT is to apply Ethernet to automation applications which require short data update times (also called cycle times) with low communication jitter (for synchronization purposes) and low hardware costs. Coupler for E-bus Terminals

Overview of EtherCAT Couplers

An EtherCAT coupler is required in order to connect EtherCAT Terminals with E-bus-communication to an EtherCAT network. This coupler relays the communication from the higher level EtherCAT network to the terminals.

EtherCAT Coupler for E-bus terminals

The ECT-000 coupler connects the EtherCAT Device Protocol with the EtherCAT Terminals. One station consists of a coupler, any number of EtherCAT Terminals and a bus end terminal (AKT2G-EM-000-000).

The coupler converts the telegrams from Ethernet Ethernet is a large, diverse family of frame-based computer networking technologies that operate at many speeds for local area networks (LANs). 100BASE-TX to E-bus signal representation in passing with minimum latency. The coupler is connected to the network via the upper Ethernet interface. The lower RJ-45 Internet plug type. socket may be used to connect further EtherCAT devices in the same strand.

The coupler supplies the connected terminals with the necessary E-bus current for communication. The coupler can supply a maximum of 5 V/2 A. Power feed terminals (AKT2G-PSF-024-000) must be integrated if more current is required.

In the EtherCAT network, the coupler can be installed anywhere, including before, after, or in the middle of the EtherCAT servo drives A special electric amplifier used to power electric servo motors. It monitors feedback signals from the motor and continually adjusts for deviation from expected behavior.. However, the coupler does not support MAC Unicast or IP addressing from a switch or a router.

EtherCAT Coupler Port Allocation

According to the EtherCAT specification, an ESC (EtherCAT Slave Controller, hardware processing unit of the EtherCAT protocol) can have 1 to 4 ports, which it controls itself. Via an open port it can handle outgoing and incoming Ethernet traffic.

The following figure shows the direction The orientation components of a vector in space. of data flow in a fully connected ECT-000 as an example:

Figure 1: Example: AKT2G-ECT-000 EtherCAT coupler with 3 ports

Figure 2: Internal and external port assignment for Bus Coupler AKT2G-ECT-000

Frame In networking dialect, a message is called a frame. processing sequence

1. The EtherCAT frame arriving at the EtherCAT signal input is passed on by Port 0 (A) to the EtherCAT processing unit.
2. The EtherCAT frame arrives at Port 1 (B) and the data frame departs via Port 1 (B) to the following slave in the EtherCAT terminal network (if a slave is connected there and reports ‘Link’).
3. After the arrival of the data frame at Port 1 (B) from the terminal network, this is passed on to Port 2 (C) and leaves the coupler at the following EtherCAT output (if a slave is connected there and reports ‘Link’).
4. The data frame arrives at Port 2 (C). This is now forwarded to port 0 (A) and leaves the ECT-000 via the EtherCAT input.

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• Processing of the data

  The data in the EtherCAT datagrams are processed only between Ports 0 (A) and 3 (D) in the EtherCAT processing unit. The non-implemented (internal) Port 3 (D) is considered to be closed and passes on the datagram to Port 1 (B).

Power Supply, Potential Groups

Bus Coupler power supply

The Bus Coupler requires a 24 VDC supply for its operation. The connection is made by means of the upper spring-loaded terminals labeled 24 V and 0 V. The supply voltage is used by the Bus Coupler electronics and for direct voltage generation for the E-bus. The voltage generation for the E-bus takes place in a DC/DC converter without electrical isolation.

The ECT-000 units supply the E-bus with max. 2,000 mA E-bus current. Power feed terminals are to be inserted if the added terminals require more current.

Input for power contacts

The bottom six connections with spring-loaded terminals can be used to feed the supply for the peripherals. The spring-loaded terminals are joined in pairs to a power contact. The feed for the power contacts has no connection to the voltage supply for the Bus Coupler. The design of the feed permits voltages of up to 24 V. The assignment in pairs and the electrical connection between feed terminal contacts allows the connection wires to be looped through to various terminal points. The current load via the power contacts may not permanently exceed 10 A; the supply line must therefore be protected by a 10 A fuse (slow-blow).

Power contacts

On the right hand face of the Bus Coupler there are three spring contacts for the power contact connections. The spring contacts are hidden in slots so that they can not be accidentally touched. By attaching a Bus Terminal the blade contacts on the left hand side of the Bus Terminal are connected to the spring contacts. The tongue and groove guides on the top and bottom of the Bus Coupler and of the Bus Terminals guarantees that the power contacts mate securely.

The current load of the power contacts may not permanently exceed 10 A.

Electrical isolation

The bus couplers operate by means of three independent potential groups. The supply voltage feeds the E- bus electronics in the bus coupler and the E-bus itself, which are electrically isolated. The supply voltage is also used to generate the operating voltage for the fieldbus.

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• All the Bus Terminals are electrically isolated from the E-bus. The E-bus is thus electrically isolated from everything else.

Figure 3: Potential diagram ECT-000

GND concept

Figure 4: GND concept ECT-000

Fuse protection

Coupler supply, fuse 1	Depending on the required current consumption and hence the configured terminals typical max. 1 A
Power contacts, fuse 2	Permitted max. 10 A (slow-blow)

The coupler electronics and the power contacts can be supplied together from the same source. In this case the fuse should be dimensioned for 10 A max.

ECT-000 Diagnostic LEDs

Figure 5: Diagnostic LEDs EK1100, EK1100-0008

LEDs for Power Supply Diagnostics

LED		Display	State	Description
Us	green	off	-	No operating voltage present at the Bus Coupler
		on	-	24 VDC operating voltage present at the Bus Coupler
Up	green	off	-	No power supply present at the power contacts
		on	-	24 VDC power supply present at the power contacts

Diagnostic LEDs for the EtherCAT State Machine/PLC

LED		Display	State	Description
RUN	green	off	Init	The Bus Coupler is in initialization state
		flashing	Pre-Operational	The Bus Coupler is in pre-operational state
		single flash	Safe-Operational	The Bus Coupler is in safe-operational state
		on	Operational	The Bus Coupler is in operational state
		flickers	Bootstrap	Firmware is being loaded.

LEDs for Fieldbus Diagnosis

LED		Display	State	Description
LINK/ACT (X1 IN)	green	off	-	No connection on the incoming EtherCAT strand
		on	linked	Preceding In arithmetic and algebra, when a number or expression is both preceded and followed by a binary operation, a rule is required for which operation should be applied first. From the earliest use of mathematical notation, multiplication took precedence over addition, whichever side of a number it appeared on. Example: 3 + 4 × 5 = 5 × 4 + 3 = 23. To change the order of operations, we use parentheses (). Example: To force addition to precede multiplication, we write (3 + 4) × 5 = 35. EtherCAT device connected
		flashing	active	Communication with preceding EtherCAT device
LINK/ACT (X2 OUT)	green	off	-	No connection on the outgoing EtherCAT strand
		on	linked	Following EtherCAT device connected
		flashing	active	Communication with following EtherCAT device
LINK / ACT E- bus	green	off	-	No connection to internal E-bus
		on	linked	Connection to internal E-bus
		flashing	active	Connection/communication internal E-bus

Technical Data

Characteristic	AKT2G-ECT-000-000
Protection class	IP20
Higher level network technology	100 MBit FastEthernet (100BASE-TX)
Higher level network - max. connection length	100 m
Higher level network connection technology	RJ45 Internet plug type.
higher-level network protocol	EtherCAT Device Protocol
supports HotConnect with address setting on the device	yes, Fast-Hot-Connect

Technical Data	AKT2G-ECT-000-000
Task in the EtherCAT system	Coupling of EtherCAT Terminals (ECT-xxx) to 100BASE-TX EtherCAT networks
Number of EtherCAT Terminals	up to 65535 in the overall system
Number of peripheral signals	max. 4.2 GB addressable IO points
Data transfer medium	Ethernet 100BASE-TX (at least Ethernet CAT5 cable)
Cable length between 2 Bus Couplers	max. 100 m (100BASE-TX)
Protocol / Baud rate	EtherCAT Device Protocol / 100 MBaud
HotConnect	no
Delay	1 µs typ.
Bus connection	2 x RJ45
Power supply	24 VDC (-15%/+20%)
Current consumption	70 mA + (∑ E-bus current/4)
E-bus power supply (5 V)	max. 2 A (-25 °C ... +55 °C)
	max. 1 A (> +55 °C)
Power contacts	max. 24 VDC, max. 10 A
Electrical isolation	500 V (power contact/supply voltage/EtherCAT)
Dimensions (W x H x D)	approx. 44 mm x 100 mm x 68 mm
Weight	approx. 105 g
Permissible ambient temperature range during operation	-25°C ... +60°C (extended temperature range)
Permissible ambient temperature range during storage	-40°C ... + 85°C
Permissible relative air humidity	95%, no condensation
Mounting	on 35 mm mounting rail according to EN 60715
Vibration / shock resistance	conforms to EN 60068-2-6 / EN 60068-2-27, see also Installation instructions] for enhanced mechanical load capacity
EMC immunity / emission	conforms to EN 61000-6-2 / EN 61000-6-4
Protection class	IP20
Installation position Position means a point in space which is described by different coordinates. Depending on the used system and transformation it can consist of a maximum of six dimensions (coordinates).This means three Cartesian coordinates in space and coordinates for the orientation. In ACS there can be even more than six coordinates. If the same position is described in different coordinate systems the values of the coordinates are different.	variable
Approval	CE, ATEX, cULus, IECEx