Phoenix Contact IL ETH BK DI8 DO4 2TX-PAC User manual

1Description
Inline, bus coupler, Modbus/TCP (UDP),
digital inputs: 8, 24 V DC,
digital outputs: 4, 24 V DC, 500 mA
IL ETH BK DI8 DO4 2TX-PAC
© PHOENIX CONTACT
Data sheet
The bus coupler with integrated I/Os is intended for use
within a Modbus/TCP(UDP) network and represents the
link to the Inline I/O system.
Up to 61 Inline devices can be connected to the bus coupler.
The bus coupler supports a maximum of 16PCP devices.
Features
– 2 Ethernet ports (with integrated switch)
– Auto negotiation
– Autocrossing
– Transmission speed of 10 Mbps and 100 Mbps
– Automatic detection of the transmission speed in the
local bus (500kbps or 2Mbps)
–Eightdigital inputs, fourdigital outputs (on-board)
– Data exchange via OPC server supported
– Software interfaces for access via TCP/IP: Device
Driver Interface (DDI) and High-Level Language
Fieldbus Interface (HFI)
– Web-based management
WARNING: Explosion hazard when used in potentially explosive areas
When using the terminal in potentially explosive areas, observe the corresponding notes.
This data sheet is only valid in association with the ILSYSINSTUME user manual.
Make sure you always use the latest documentation.
It can be downloaded at: phoenixcontact.net/product/2703981
7275_en_09 2020-02-26

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 2 / 37
2Tableofcontents
1 Description .............................................................................................................................. 1
2 Table of contents ..................................................................................................................... 2
3 Ordering data .......................................................................................................................... 3
4 Technical data ......................................................................................................................... 5
5 Internal circuit diagram ............................................................................................................ 9
6 Notes on using the terminal block in potentially explosive areas ........................................... 10
7 Safety note ............................................................................................................................ 10
8 Connecting Ethernet, the supply, actuators, and sensors...................................................... 11
9 Connection example.............................................................................................................. 12
10 Local diagnostic and status indicators................................................................................... 13
11 Reset button .......................................................................................................................... 15
12 Startup................................................................................................................................... 16
13 Startup behavior of the bus coupler ....................................................................................... 16
14 Monitoring.............................................................................................................................. 19
15 Modbus protocols and registers ............................................................................................ 21
16 Special registers.................................................................................................................... 27
17 DDI: Device Driver Interface ..................................................................................................31
18 HFI: High-Level Language Fieldbus Interface........................................................................ 35
19 WBM: Web-based management ........................................................................................... 35
20 Firmware update.................................................................................................................... 35
21 Process data access via XML................................................................................................ 35
22 SNMP: Simple Network Management Protocol ..................................................................... 37

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 3 / 37
Description Ty p e Order No. Pcs./Pkt.
Inline, Bus coupler, Modbus/TCP(UDP), RJ45 socket,
digital inputs: 8, 24 VDC, connection method: 3-wire,
digital outputs:4, 24 VDC, 500 mA, connection
method:3-wire, transmission speed in the local bus:
500 kbps / 2 Mbps, degree of protection:IP20, including
Inline connectors and marking fields
IL ETH BK DI8 DO4 2TX-PAC 2703981 1
3Orderingdata
Accessories Ty p e Order No. Pcs./Pkt.
Quick mounting end clamp for NS 35/7,5 DIN rail or NS 35/
15 DIN rail, with marking option, width: 9.5 mm, color: gray
(Mounting)
CLIPFIX 35 3022218 50
End clamp, width:9.5 mm, height:35.3 mm, material:PA,
length:50.5 mm, Mounting on a DIN rail NS 32 or NS 35,
color:gray (Mounting)
E/UK 1201442 50
Insert strip, Sheet, white, unlabeled, can be labeled with:
Office printing systems: Laser printer, mounting type:
insert, lettering field size: 62 x 46 mm, Number of
individual labels: 120 (Marking)
ESL 62X46 0809502 5
Labeling field, width: 48.8 mm (Marking) IB IL FIELD 8 2727515 10
Insert strip, Sheet, white, unlabeled, can be labeled with:
Office printing systems: Laser printer, mounting type:
insert, lettering field size: 62 x 10 mm, Number of
individual labels: 72 (Marking)
ESL 62X10 0809492 1
Labeling field, width: 12.2 mm (Marking) IB IL FIELD 2 2727501 10
RJ45 connector, shielded, with bend protection sleeve,
2 pieces, gray for straight cables, for assembly on site. For
connections that are not crossed, it is recommended that
you use the connector set with gray bend protection
sleeve. (Connector/Adapter)
FL PLUG RJ45 GR/2 2744856 1
RJ45 connector, shielded, with bend protection sleeve,
2 pieces, green for crossed cables, for assembly on site.
For connections that are crossed, it is recommended that
the connector set with green bend protection sleeves is
used. (Connector/Adapter)
FL PLUG RJ45 GN/2 2744571 1
CAT5-SF/UTP cable (J-02YS(ST)C HP 2 x 2 x 24 AWG),
heavy-duty installation cable, 2 x 2 x 0.22 mm², solid
conductor, shielded, outer sheath: 7.8 mm diameter, inner
sheath: 5.75 mm ± 0.15 mm diameter (Cable/conductor)
FL CAT5 HEAVY 2744814 1
CAT5-SF/UTP cable (J-LI02YS(ST)C H 2 x 2 x 26 AWG),
light-duty, flexible installation cable 2 x 2 x 0.14 mm²,
stranded, shielded, outer sheath: 5.75 mm ± 0.15 mm
diameter (Cable/conductor)
FL CAT5 FLEX 2744830 1

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 4 / 37
Crimping pliers, for assembling the RJ45 plugs FL PLUG
RJ45..., for assembly on site (Tools)
FL CRIMPTOOL 2744869 1
Connector set, for Inline bus coupler with I/Os mounted in
rows (Connector/Adapter)
IL BKDIO-PLSET 2878599 1
IPAssign is an easy to use tool for setting the IP address of
devices which rely on BOOTP. No installation or
administrative rights are required to use IPAssign.
This product is free and only available from the
"Downloads" tab.
IPASSIGN 2701094 1
Accessories Ty p e Order No. Pcs./Pkt.
Documentation Ty p e Order No. Pcs./Pkt.
User manual, English, Automation terminals of the Inline
product range
IL SYS INST UM E - -
Application note, German/English, I/O modules at bus
couplers
AH IL BK IO LIST - -
Application note, English, Inline terminals for use in zone2
potentially explosive areas
AH EN IL EX ZONE 2 - -
User manual, English, for drivers for G4-based controller
boards, only available as a download.
IBS PC SC SWD UM E 2745172 1
User manual, English, for firmware messages of
Generation 4 controller boards, only available as a
download.
IBS SYS FW G4 UM E 2745185 1
User manual, English, for the Peripherals Communication
Protocol (PCP), only available as a download.
IBS SYS PCP G4 UM E 2745169 1
Quick start guide, English, high-level language
programming with HFI user interface
UM QS EN HFI PROG - -
Application note, English, Measures to protect network-
capable devices with Ethernet connection against
unauthorized access
AHENINDUSTRIAL
SECURITY
- -
Additional ordering data
For more ordering data (accessories), visit phoenixcontact.net and look at the product catalogs.
Media converters for conversion and transmission of data via fiber-optic cables (see "Automation" catalog)
Power supplies for the bus coupler (see the "Power supplies, surge protection and device circuit breakers" catalog)

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 5 / 37
Dimensions (nominal sizes in mm)
Width 80 mm
Height 119.8 mm
Depth 71.5 mm
Note on dimensions Specfications with connectors
4 Technical data
119,8
71,5
General data
Color green
Weight 375 g (with connectors)
Ambient temperature (operation) -25 °C ... 55 °C
Ambient temperature (storage/transport) -40 °C ... 85 °C
Permissible humidity (operation) 10 % ... 95 % (non-condensing)
Permissible humidity (storage/transport) 10 % ... 95 % (non-condensing)
Air pressure (operation) 70 kPa ... 106 kPa (up to 3000m above sea level)
Air pressure (storage/transport) 70 kPa ... 106 kPa (up to 3000m above sea level)
Degree of protection IP20
Protection class III (IEC61140, EN61140, VDE0140-1)
Connection data: Inline connector
Connection method Spring-cage connection
Conductor cross section solid / stranded 0.08 mm² ... 1.5 mm² / 0.08 mm² ... 1.5 mm²
Conductor cross section [AWG] 28 ... 16
Stripping length 8 mm
Connection data for UL approvals: Inline connector
Connection method Spring-cage connection
Conductor cross section solid / stranded 0.2 mm² ... 1.5 mm² / 0.2 mm² ... 1.5 mm²
Conductor cross section [AWG] 24 ... 16
Stripping length 8 mm

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 6 / 37
Interface: Modbus/TCP (UDP)
Number 2
Connection method RJ45 socket
Note on the connection method Auto negotiation and autocrossing
Transmission speed 10/100 Mbps
Transmission physics Ethernet in RJ45 twisted pair
Interface: Inline local bus
Connection method Inline data jumper
Transmission speed 500 kbps / 2 Mbps (automatic detection, no combined system)
System limits of the bus coupler
Number of local bus devices that can be connected max. 61 (The on-board I/Os are two devices)
Number of devices with parameter channel max. 16
Observe the logic current consumption of each device when configuring an Inline station! It is specified in every
terminal-specific data sheet. The current consumption can differ depending on the individual terminal. The
permissible number of devices that can be connected therefore depends on the specific station structure.
Bus coupler supply UBC; Communications power UL(7.5V) and the analog supply UANA (24 V) are generated
from the bus coupler supply.
Supply voltage 24 VDC (via Inline connector)
Supply voltage range 19.2 VDC ... 30 VDC (including all tolerances, including ripple)
Current consumption min. 80 mA (without connected I/O terminal blocks)
max. 0.98 A (with max. number of connected I/O terminal
blocks)
Cable length max. 30 m (do not route cable through outdoor areas)
Communications power (UL)
Supply voltage 7.5 VDC
Power supply unit max. 0.8 A DC
Supply of analog modules (UANA)
Supply voltage 24 VDC
Supply voltage range 19.2 VDC ... 30 VDC (including all tolerances, including ripple)
Power supply unit max. 0.5 A DC
Main circuit supply (UM)
Supply voltage 24 VDC (via Inline connector)
Supply voltage range 19.2 VDC ... 30 VDC (including all tolerances, including ripple)
Power supply unit max. 8 A DC (Sum of UM + US; 4A, maximum, when used in
potentially explosive areas.)
Current consumption min. 3 mA (without sensors)
max. 8 A DC
Cable length max. 30 m (do not route cable through outdoor areas)

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 7 / 37
Segment circuit supply (US)
Supply voltage 24 VDC (via Inline connector)
Supply voltage range 19.2 VDC ... 30 VDC (including all tolerances, including ripple)
Power supply unit max. 8 A DC (Sum of UM + US; 4A, maximum, when used in
potentially explosive areas.)
Current consumption min. 3 mA (without actuators)
max. 8 A DC
Cable length max. 30 m (do not route cable through outdoor areas)
Power consumption
Power consumption typ. 3 W (entire device)
Protective circuit
Surge protection (segment supply, main supply, bus
coupler supply)
Suppressor diode, 35 V DC
Reverse polarity protection (segment supply, main supply,
bus coupler supply)
Suppressor diode, 35 V DC
Protection
NOTE: Electronics may be damaged when overloaded
Provide external protection for the 24V areas UBK, UM, and US. If you are using an external fuse, the power
supply unit must be able to supply four times the nominal current of the fuse. This ensures that it trips in the
event of an error.
Digital inputs
Number of inputs 8
Connection method Inline connector
Connection technology 3-wire
Description of the input EN 61131-2 type 1
Nominal input voltage 24 VDC
Nominal input current typ. 3 mA
Current flow Limited to 3mA, maximum
Input voltage range "0" signal -30 VDC ... 5 VDC
Input voltage range "1" signal 15 VDC ... 30 VDC
Delay at signal change from 0 to 1 typ. 1.2 ms
Delay at signal change from 1 to 0 typ. 1.2 ms
Permissible conductor length to the sensor 100 m
Reverse polarity protection Suppressor diode
Digital outputs
Number of outputs 4
Connection method Inline connector
Connection technology 3-wire
Nominal output voltage 24 VDC
Voltage difference with nominal current < 1 V
Maximum output current per channel 500 mA

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 8 / 37
Maximum output current per device 2 A
Nominal load, ohmic 12 W
Nominal load, inductive 12 VA (1.2 H, 48 Ω)
Nominal load, lamp 12 W
Signal delay typ. 1.2 ms
Maximum operating frequency with inductive nominal
load
0.5 Hz (1.2 H, 48 Ω)
Behavior at voltage switch-off The output follows the power supply without delay
Limitation of the voltage induced on circuit interruption approx. -30 V
Output current when switched off max. 10 µA (When not loaded, a voltage can be measured
even at an output that is not set.)
Behavior with overload Auto restart
Behavior with inductive overload Output can be destroyed
Reverse voltage resistance to short pulses Reverse voltage proof
Resistance to permanent reverse voltage max. 2 A
Overcurrent shut-down min. 0.7 A
Short-circuit and overload protection Freewheeling circuit in the output driver
Digital outputs
Error messages to the higher level control or computer system
Short-circuit or overload of the digital outputs Yes
Sensor supply failure Yes
Failure of the actuator supply Yes
Mechanical tests
Vibration resistance in acc. with EN60068-2-6/
IEC60068-2-6
5g
Shock in acc. with EN60068-2-27/IEC60068-2-27 Operation: 25g, 11 ms duration, semi-sinusoidal shock impulse
Conformance with EMC Directive 2014/30/EU
Noise immunity test in accordance with EN 61000-6-2
Electrostatic discharge (ESD) EN61000-4-2/
IEC61000-4-2
Criterion B, 6 kV contact discharge, 8 kV air discharge
Electromagnetic fields EN61000-4-3/IEC61000-4-3 Criterion A, Field intensity: 10 V/m
Fast transients (burst) EN61000-4-4/IEC61000-4-4 Criterion A, all interfaces 1 kV
Criterion B, all interfaces 2 kV
Transient overvoltage (surge) EN61000-4-5/
IEC61000-4-5
Criterion B, supply lines DC: 0.5 kV/0.5 kV (symmetrical/
asymmetrical), fieldbus cable shield 1 kV
Conducted interference EN61000-4-6/IEC61000-4-6 Criterion A, Test voltage 10 V
Noise emission test as per EN 61000-6-4 Class A
Approvals
For the latest approvals, please visit phoenixcontact.net/products.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 9 / 37
5 Internal circuit diagram
Figure 1 Internal wiring of the terminal points
Key:
The gray areas in the basic circuit diagram represent the
electrically isolated areas:
8x DI
4x
DO
PWR
C
DI1...8
U
S
U
BK
U
M
DO1...4
US
UM
UL+
UANA
µP
24V
24V
24V
7,5V
IB
B
A
2 TX ETH
UL-
Local bus
ACT1/2
LNK1/2
BO UL UMUS
RY CONFPP
Microprocessor
Protocol chip
Optocoupler
Ethernet Switch
PNP transistor
Transmitter with electrical isolation
LED
µP
IB
Power supply unit
Electrically isolated area
A Ethernet interface
BLogic
C I/O devices
Please refer to the ILSYSINSTUME user
manual for an explanation of other symbols
used.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 10 / 37
6 Notes on using the terminal block
in potentially explosive areas
Approval according to ATEX Directive 2014/34/EU
II 3 G Ex nA IIC T4 Gc X
Installation notes
The category 3 device is designed for installation in zone 2
potentially explosive areas.
The device meets the requirements of EN60079-0:2012 +
A11:2013 and EN60079-15:2010.
•Observe the specified conditions for use in potentially
explosive areas.
•At the time of installation, use an approved housing
(minimum protection IP54), which meets the
requirements of EN 60079-15. Within this context,
observe the requirements of IEC 60079-14/EN 60079-
14.
•The following work is only permitted in potentially
explosive areas when the power is disconnected:
•Connect the DIN rail to the protective earth ground.
•For reliable operation, the RJ45 plug needs to have a
fully functioning locking clip. Repair any damaged plugs
immediately.
•Only devices that are designed for operation in Ex Zone
2 and the conditions at the installation location may be
connected to the circuits in Zone 2.
•Make sure that the maximum permissible current of 4A
flowing through potential jumpers UMand US(total
current) is not exceeded.
•When using the device in potentially explosive areas,
observe the specifications in the application note
AHDEILEXZONE2 (German) / AHENILEXZONE2
(English).
7Safetynote
If possible, deactivate unused communication channels.
Assign passwords such that third-parties cannot access the
bus coupler and make changes without authorization.
Due to its communication interfaces, the bus coupler should
not be used in safety-critical applications without additional
security appliances.
Therefore, please take additional protective measures in
accordance with the IT security requirements and the
standards applicable to your application (e.g.virtual
networks (VPN) for remote maintenance access, firewalls,
etc.) for protection against unauthorized network access.
On first request, you shall release PhoenixContact and the
companies associated with
PhoenixContactGmbH&Co.KG, Flachsmarktstrasse8,
32825Blomberg in accordance with §§15ff.AktG (German
Stock Corporation Act), hereinafter collectively referred to
as "Phoenix Contact",
from all third-party claims made due to improper use.
For the protection of networks for remote maintenance via
VPN, PhoenixContact offers the mGuard product series as
security appliances; these are described in the latest
PhoenixContact catalog (phoenixcontact.net/products).
Additional measures for protection against unauthorized
network access can be found in the
AHENINDUSTRIALSECURITY application note. The
application note can be downloaded at phoenixcontact.net/
products.
WARNING: Explosion hazard
Please make sure that the following notes and
instructions are observed.
- Snapping the device onto the DIN rail
- Removing the device from the DIN rail
- Connection and disconnection of cables
NOTE: Risk of unauthorized network
access
Connecting devices to a network via Ethernet
entails the danger of unauthorized access to
the network.
To prevent unauthorized network access,
please read the following notes.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 11 / 37
8 Connecting Ethernet, the supply,
actuators, and sensors
8.1 Connecting Ethernet
Connect Ethernet to the bus coupler via an 8-pos. RJ45
connector.
The Ethernet connections are set to autocrossing.
Shielding
The shielding ground of the connected
twisted pair cables is electrically connected
with the socket. When connecting network
segments, avoid ground loops, potential
transfers, and voltage equalization currents
via the braided shield.
Observe bending radii
The housing dimensions specified under
"Dimensions" refer to the bus coupler with I/O
connectors without Ethernet connection.
When installing the bus coupler in a control
box, observe the bending radii of the Ethernet
cables and the connectors used (e.g.,
FLCAT5FLEX: 30mm for fixed installation
and FLCAT5HEAVY: 30mm without outer
sheath and 45mm with outer sheath). If
required, use angled RJ45 connectors to
maintain these bending radii.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 12 / 37
8.2 Connecting the supply, actuators, and sensors
- terminal point assignment
Figure 2 Terminal point assignment
Terminal point assignment of the power connector (1)
Terminal point assignment of the output connector (2)
Terminal point assignment of the input connector (3)
Terminal point assignment of the input connector (4)
9 Connection example
Figure 3 Connection example
Te r m i n a l
point
Assignment Te r m i n a l
point
Assignment
1.1 US2.1 UM
1.2 UBK 2.2 UM
1.3 GND UBK 2.3 GND UM, US
1.4 Functional
earth ground
(FE)
2.4 Functional
earth ground
(FE)
NOTE: Malfunction
The module is designed exclusively for SELV
operation according to IEC950/EN60950/
VDE0805.
For information on the power supplies, please
refer to the ILSYSINSTUME user manual.
If you want to use the same reference
potential for communications power and
segment voltage, you can bridge the terminal
points 1.3 and 2.3 on the connector.
Make sure that the maximum total current
flowing through the potential jumpers is 8A.
Connect the functional earth ground via the
power connector.
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
1
2
3
4
1
2
3
4
PWR
1.1
1.21.2
1.3
1.4
2.12.1
2.32.3
2.42.4
2.22.2
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
1
2
3
4
1
2
3
4
O1
1.1
1.21.2
1.3
1.4
2.12.1
2.32.3
2.42.4
2.22.2
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
1
2
3
4
1
2
3
4
I1
1.1
1.21.2
1.3
1.4
2.12.1
2.32.3
2.42.4
2.22.2
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
1
2
3
4
1
2
3
4
I2
3.1
3.23.2
3.3
3.4
4.1
4.3
4.4
4.24.2
1234
Te r m i n a l
point
Assignment Te r m i n a l
point
Assignment
1.1 OUT1 2.1 OUT2
1.2GND2.2GND
1.3 FE 2.3 FE
1.4 OUT3 2.4 OUT4
Te r m i n a l
point
Assignment Te r m i n a l
point
Assignment
1.1IN12.1IN2
1.2 UM2.2 UM
1.3GND2.3GND
1.4IN32.4IN4
Te r m i n a l
point
Assignment Te r m i n a l
point
Assignment
3.1IN54.1IN6
3.2 UM4.2 UM
3.3GND4.3GND
3.4IN74.4IN8
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
3.1
3.2
3.3
3.4
4.1
4.2
4.3
4.4
1.1
1.2
1.3
1.4
2.1
2.2
2.3
2.4
MODBUS/TCP(UDP)
DO4PWR
1234
DI4 DI4
IN8
+24 V
+24 V
IN6
OUT3
OUT2
-
+
24VDC
(U)
M
24VDC
(UBK)
+
-
24VDC
(US)
+
-

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 13 / 37
10 Local diagnostic and status indicators
Figure 4 Local diagnostic and status indicators
ETHERNET
IL ETH BK DI8DO4 2TX-PAC
Order-No.: 2703981
HW/FW: 00/100
MAC Addr.: xx.xx.xx.xx
LNK1ACT1
LNK2ACT2
X1
X2
RESET
UL
US
UM
PP
NF
CO
PWR
DE
O1
1
3
2
4
I1
1
3
2
4
I2
7
5
86
BORY
DE
O1
1
3
2
4
I2
I2
5
7
6
8
O1
I1
I1
1
3
2
4
UL
US
UM
PP
NF
CO
PWR
BORY
PWR
LNK2
LNK1
ETH
ACT1
ACT2
Designation Color Meaning State Description
ETH
LNK 1/2 Green Link port 1/2 On Connection via Ethernet to a module via port 1/2 established
Off No connection established via port 1/2
ACT 1/2 yellow Activity port 1/2 Flashing Transmission or reception of Ethernet telegrams at port 1/2
Off No transmission or reception of Ethernet telegrams at port 1/2
PWR/ETH
BO Green Boot Off System startup completed
Flashing Waiting for BootP/DHCP reply
On Boot loader active, firmware started
UL Green ULogic Off 24 V bus coupler supply not present
On 24 V bus coupler supply present
US Green USegment Off 24 V segment supply not present
On 24 V segment supply is present
UM Green UMain Off 24 V supply is not present in the main circuit
On 24 V supply is present in the main circuit
RY Green Ready On Connection to a process data client established
Flashing Firmware ready to operate
Off Device is not ready for operation.
PP Yellow Plug and Play
mode
On Plug and Play mode is activated.
Off Plug and Play mode is deactivated.
NF Red Network Failure Network error
Off No network error, normal state
On A network error has occurred. The monitoring function detected
an error or the process data watchdog was activated.
CO Red Configuration Off The active configuration of the local bus matches the saved con-
figuration.
On The active configuration of the local bus differs from the saved
configuration.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 14 / 37
O1: diagnostics of the Inline station/diagnostics and status of the outputs
D Green Diagnostics On Data transmission active within the station
Flashing Data transmission not active within the station
ERedError On Short circuit/overload at one of the outputs
Off No short circuit/overload at one of the outputs
1 ... 4 Yellow Status of out-
puts 1 ... 4
On Output is set.
Off Output is not set.
I1, I2: status of the inputs
1 ... 8 Yellow Status of the in-
puts 1 ... 8
On Input is active.
Off Input is inactive.
Designation Color Meaning State Description

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 15 / 37
11 Reset button
The reset button is on the front of the bus coupler.
The reset button has two functions:
– Restarting the bus coupler
– Resetting of the default settings
11.1 Restarting the bus coupler
Restart the bus coupler by pressing the reset button during
ongoing operation.
The outputs of the station are reset.
The process image of the inputs is not re-read.
11.2 Resetting to the default settings
The bus coupler is supplied with the following default
settings:
If you wish to restore the default settings, proceed as
follows:
•Disconnect the power to the module.
•Press and hold the reset button.
•Switch on the power.
•When the RY LED flashes green, release the button.
The default settings are restored.
IP settings
IP address 0.0.0.0
Subnet mask 0.0.0.0
Default gateway 0.0.0.0
BootP activated
Firmware update
Firmware update on next
restart
deactivated
TFTP server IP address 0.0.0.0
Name of firmware update
file
c2703981.fw
System identification
Name of device IL ETH BK DI8 DO4 2TX-
PAC
Description Ethernet bus terminal
Location unknown
Contact unknown
Process data monitoring
Process data watchdog
time-out
500ms
Fault response mode Reset fault mode (De-
fault)
Plug and Play mode activated
Expert mode deactivated
Delayed startup
(firmware version 1.42 or later)
deactivated
On-board inputs and outputs
(firmware version 1.42 or later)
activated

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 16 / 37
12 Startup
12.1 Starting the firmware
The firmware is started after you have supplied power to the
bus coupler.
The following LED sequence is displayed:
12.2 Sending BootP requests
Initial startup
During initial startup, the device sends BootP requests
without interruption until it receives a valid IP address. The
requests are transmitted at varying intervals (2s, 4s, 8s,
2s, 4s, etc.) so that the network is not unnecessarily
burdened. If the device receives valid IP parameters, it
saves them as configuration data.
Restart
If the bus coupler already has valid configuration data and
BootP is not disabled, it only transmits three more BootP
requests during a restart.
If it receives a BootP reply, the new parameters are saved.
If the bus coupler does not receive a response, it starts with
the previous configuration.
If BootP is disabled and a valid configuration is available, the
bus coupler starts immediately.
13 Startup behavior of the bus coupler
The startup behavior of the bus coupler is determined by the
following system parameters:
13.1 Plug and Play mode
Plug and Play mode active
The bus coupler supports Plug and Play mode.
Plug and Play mode enables local bus modules connected
in the field to be started up using the bus coupler without a
higher-level computer (engineering system).
The Plug and Play mode status (active or inactive) is stored
retentively on the bus coupler. The current mode is
displayed via the PPLED.
In Plug and Play mode, the connected local bus modules are
detected and their function checked.
If this physical configuration is ready to operate, it is started;
however, writing outputs is not enabled.
By default, the bus coupler has no valid IP
parameters.
Display Meaning
BO flashing Starting the boot loader
Sending BootP requests
BO on Extracting the firmware
BO off Starting firmware
RY flashing Firmware ready to operate
You can use any BootP server available to
define the IP address via BootP.
You can see whether BootP is disabled in the
"IP Configuration" menu in web-based
management.
Parameter Var ID
(hex)
Delivery state
Plug and Play mode 2240 Activated
Expert mode 2275 Deactivated
Delayed startup
(firmware version 1.42 or later)
2278 Deactivated
This description is applicable only when
expert mode is disabled.
To enable writing outputs, Plug and Play
mode must be deactivated. The deactivation
is to be saved at the same time as saving the
signal, active configuration, and reference
configuration.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 17 / 37
Plug and Play mode inactive
When plug and play mode is deactivated, the reference
configuration is compared to the physical configuration. If
the configurations are identical, the bus coupler is set to the
RUN state on the first write access.
If the reference configuration and the physical configuration
differ, the LEDCO lights up red. In this case, process data
exchange is not possible for safety reasons.
In order to operate the bus despite this, you have the
following two options:
1. Restore the original configuration so that the reference
configuration and the physical configuration are the
same again.
2. Activate plug-and-play mode and restart the bus
coupler so that the active physical configuration is
accepted as the reference configuration.
13.2 Expert mode
Expert mode disabled
If expert mode is disabled (default upon delivery), the bus
coupler runs in plug-and-play mode.
Expert mode enabled
If expert mode is enabled, the bus is not started
automatically. You must set the station to the "RUN" state
using the appropriate firmware commands.
Suitable firmware commands include e.g.
CREATE_CONFIGURATION, 0710hex and
START_DATA_TRANSFER, 0701hex.
The PP and CO LEDs are not used.
13.3 Delayed startup (delayed start data transfer)
Firmware version 1.42 or later.
Delayed startup deactivated
If delayed startup is deactivated (delivery state), then the
bus coupler works as described in the section “Plug-and-
play mode”.
Delayed startup activated
If delayed startup is activated, data transmission to the local
bus is only activated once the controller first receives write
access for the process data. Alternatively, you can activate
data transmission using the command “Clear Net Fail”.
The LEDD will initially show the status “ACTIVE” (flashing).
This option makes it possible for local bus devices to directly
specify valid process data after the bus coupler is restarted.
Note the following for the time until the start of
data transmission:
– PCP transfer is not possible.
– The input process data is not valid.
If a station only contains input terminals, note
the following:
You must first start the data transfer (as
described above). Only then can you read
valid input process data.
Recommendation: If your station only
contains input terminals, do not activate this
option.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 18 / 37
13.4 Possible combinations of modes
13.5 Startup diagrams for the bus coupler
Figure 5 Normal mode. Plug and Play mode and expert
mode deactivated
Figure 6 Plug and Play mode activated and expert
mode deactivated
Plug and Play
mode
Expert mode Description/effect
Deactivated Deactivated Normal case. The station sets the valid configuration to the “RUN” state. The process
data exchange is possible.
Activated Deactivated The connected configuration is stored as the reference configuration and the station
is set to the "RUN" state. Process data cannot be written.
Any Activated The bus is not started automatically, instead it waits for firmware commands from the
user.
When you have disabled expert mode, restart
the bus coupler. The modification only takes
effect after a restart.
Power-Up
Ye s
No
Load and activate the stored
configuration
Configuration = reference
configuration?
Put the station in the
"RUN" state
Station in the
"RUN" state
PP LED = OFF
COLED = OFF
D LED = ON
Stop PP LED = OFF
COLED = ON D
LED = Flash error
cause in the local
bus diagnostic
registers or in WEB
If you have activated the delayed startup, the
station is not immediately switched to the
“RUN” state, but rather initially switches to the
“ACTIVE” state (LEDD flashes).
Once you have written process data for the
first time or executed the command “Clear Net
Fail”, the station switches to the “RUN” state
(LEDD on).
Power-up
Ye s
No
Reads in a connected
configuration
Can the configuration be
operated?
Put the station in the
"RUN" state
Station in the
"RUN" state
PP LED = ON
COLED = OFF
D LED = ON
Stop
PP LED = ON
COLED = ON
D LED = Flash error
cause in the local
bus diagnostic
registers

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 19 / 37
13.6 Changing and starting a configuration in plug-
and-play mode
Changing the existing configuration
Proceed as follows to change an existing configuration:
•Switch off the supply voltage.
•Change the physical configuration.
•Switch on the supply voltage.
Starting up a configuration
Startup is carried out as described in the preceding section.
Please note:
– If there are no errors, after the bus coupler has been
switched on, it reads in the previously found
configuration and starts it.
– If the D LEDs are continuously lit on all terminals, all
devices are integrated into the current configuration.
– To prevent you from accidentally working with an
incorrect configuration, it is only possible to access the
process data when plug-and-play mode has been
disabled.
14 Monitoring
Various functions are available for monitoring the Ethernet
communication:
– Process data watchdog (process data monitoring)
– Connection monitoring for Modbus and DTI
The monitoring functions differ according to the features and
functions that need to be monitored. Depending on the
application requirements, the appropriate monitoring
function can be activated. The process data watchdog is
deactivated by default upon delivery.
If an error occurs, the bus coupler issues a fault response.
Define the desired fault response mode for this.
14.1 Setting the fault response mode
There are various options for setting the desired fault
response mode:
– Web-based management
– Writing to Modbus register 2002
– "Set_Value" service for the variable 2277hex
Possible values for fault response mode
Ensure that plug-and-play mode is enabled
and expert mode is disabled.
When plug-and-play mode is enabled, access
to process data is denied with the error
message 00A9hex (ERR_PLUG_PLAY). The
outputs of the entire Inline station are reset in
plug-and-play mode.
You have various options for switching off
plug-and-play mode:
– Web-based management
– Modbus command register
– "Set_Value" via Ethernet command
Once plug-and-play mode has been switched
off, the bus is only started if the existing
configuration and the reference configuration
are the same.
Monitor-
ing
mecha-
nism
Monitored property/function
Client
applica-
tion
Individ-
ual chan-
nels
Ethernet
connec-
tion
Process
data
exchang
e
Process
data
watchdog
X- XX
Connec-
tion moni-
toring for
Modbus
and DTI
XXX-
Fault response
mode
Value Function
Standard fault
mode
0 Set all outputs to 0.
Reset fault
mode (Default)
1 Set digital outputs to 0.
Set analog outputs to the de-
fault value for the terminal.
Hold last state
mode
2 All outputs keep their last value.

IL ETH BK DI8 DO4 2TX-PAC
7275_en_09 PHOENIX CONTACT 20 / 37
14.2 Process data watchdog / process data
monitoring
Function of the process data watchdog
A process data watchdog is integrated into the bus coupler
to avoid uncontrolled setting or resetting of the I/O station
outputs in the event of an error.
If station outputs are set, the controlling process must be
able to access the station.
In the event of an error, e.g. a network cable is interrupted
or there is a function error in the controlling process, the bus
coupler can respond appropriately via the process data
watchdog.
When you activate the process data watchdog, it is started
by the first write process. It expects the next write process
within the timeout period. In error-free operation, the write
process is performed during the timeout period. The
watchdog is then restarted (triggered).
By default upon delivery, the watchdog is activated with a
500ms timeout.
Net fail
If there is no triggering during the timeout period, an error
has occurred. Two responses follow:
– The selected fault response mode is run.
–TheNetFail signal is set (the NET LED is red).
The reason for setting the net fail signal is listed in the reason
code.
For safety reasons, the user cannot stop the watchdog once
it has been activated. If the user terminates the controlling
application, the watchdog is not triggered. When the timeout
period elapses, the Net Fail signal is set and the selected
fault response mode is run. After the watchdog has been
triggered, the outputs are enabled again only after
acknowledgment.
Acknowledge error message
To reset the error, it must be acknowledged.
The following options are available:
– Web-based management
– Modbus register 2006
Configuring the process data watchdog
You can change timeout periods only if the watchdog is in
the "INIT" state. This state is present in the following cases:
– After power-up, as long as no process data exchange
has taken place.
– When a timeout has occurred, the fault response has
been activated and Net Fail has not yet been
acknowledged.
•To activate the watchdog, specify the desired time-out
value in the range between 200ms and 65000ms.
•To deactivate the watchdog, specify the value 0.
You have the following options for changing the time-out
period:
– Web-based management
– Modbus register 2000
– "Set_Value" service for the variable 2233hex
Acknowledging a fault response
You can acknowledge the Net Fail signal with the following
mechanisms:
– Web-based management
– Writing the 0002hex command to the command register
2006
– "ETH_ClrNet FailStatus" function
Reasons for a fault response
You can query the reasons for a fault response and setting
the NetFail signal with:
– Web-based management
– Modbus register 2004
– the "ETH_GetNet FailStatus" function
By default upon delivery, the process data
watchdog is activated with a timeout of
500ms.
Reading calls do not trigger the process data
watchdog.
When the error is acknowledged, the
watchdog is restarted. This means that it must
be triggered during the time-out period,
otherwise an error is detected again.