Beckhoff EL1202, EL1252, EL1254 User guide

Documentation | EN

EL1202, EL1252, EL1254

Digital Input Terminals (2 and 4 Channel, Distributed Clocks)

2020-08-06 | Version: 2.8

Table of contents

Table of contents

1 Foreword ....................................................................................................................................................5

1.1 Product overview: 2-/4-channel digital input terminals ......................................................................5

1.2 Notes on the documentation..............................................................................................................5

1.3 Safety instructions .............................................................................................................................7

1.4 Documentation issue status ..............................................................................................................8

1.5 Version identification of EtherCAT devices .......................................................................................8

1.5.1 Beckhoff Identification Code (BIC)................................................................................... 13

2 Product overview.....................................................................................................................................15

2.1 EL1202 ............................................................................................................................................15

2.1.1 EL1202 - Introduction ...................................................................................................... 15

2.1.2 EL1202 - Technical data.................................................................................................. 16

2.2 EL1252, EL1254..............................................................................................................................17

2.2.1 EL1252, EL1254 - Introduction ........................................................................................ 17

2.2.2 EL1252, EL1254 - Technical data ................................................................................... 18

2.3 Start .................................................................................................................................................18

3 Basics communication ...........................................................................................................................19

3.1 EtherCAT basics..............................................................................................................................19

3.2 EtherCAT cabling – wire-bound.......................................................................................................19

3.3 General notes for setting the watchdog...........................................................................................20

3.4 EtherCAT State Machine.................................................................................................................22

3.5 CoE - Interface: notes......................................................................................................................24

3.6 Distributed Clock .............................................................................................................................25

4 Mounting and wiring................................................................................................................................26

4.1 Instructions for ESD protection........................................................................................................26

4.2 Installation on mounting rails ...........................................................................................................26

4.3 Installation instructions for enhanced mechanical load capacity .....................................................30

4.4 Connection ......................................................................................................................................30

4.4.1 Connection system .......................................................................................................... 30

4.4.2 Wiring............................................................................................................................... 32

4.5 Installation positions ........................................................................................................................34

4.6 Positioning of passive Terminals .....................................................................................................36

4.7 ATEX - Special conditions (standard temperature range) ...............................................................37

4.8 ATEX - Special conditions (extended temperature range) ..............................................................38

4.9 Continuative documentation about explosion protection .................................................................39

4.10 UL notice .........................................................................................................................................39

4.11 EL1202 - LEDs and pin assignment ................................................................................................40

4.12 EL1252, EL1254 - LEDs and pin assignment..................................................................................41

5 Commissioning........................................................................................................................................42

5.1 TwinCAT Quick Start .......................................................................................................................42

5.1.1 TwinCAT2 ....................................................................................................................... 45

5.1.2 TwinCAT 3 ....................................................................................................................... 55

5.2 TwinCAT Development Environment ..............................................................................................68

5.2.1 Installation of the TwinCAT real-time driver..................................................................... 69

EL1202, EL1252, EL1254 3Version: 2.8

Table of contents

5.2.2 Notes regarding ESI device description........................................................................... 74

5.2.3 TwinCAT ESI Updater ..................................................................................................... 78

5.2.4 Distinction between Online and Offline............................................................................ 78

5.2.5 OFFLINE configuration creation ...................................................................................... 79

5.2.6 ONLINE configuration creation ........................................................................................ 84

5.2.7 EtherCAT subscriber configuration.................................................................................. 92

5.3 General Notes - EtherCAT Slave Application................................................................................101

5.4 Configuration with the TwinCAT System Manager - digital input and output terminals.................109

5.5 Switching characteristics ...............................................................................................................114

5.6 Sensitivity of the input....................................................................................................................114

5.7 EL1202 ..........................................................................................................................................115

5.7.1 Delivery state ................................................................................................................. 115

5.7.2 Functioning .................................................................................................................... 115

5.7.3 EL1202-0000 - EtherCAT settings ................................................................................ 116

5.7.4 EL1202-0100 - EtherCAT settings ................................................................................ 116

5.7.5 Configuration of the process data.................................................................................. 118

5.7.6 Distributed Clock settings .............................................................................................. 119

5.8 EL1252, EL1254............................................................................................................................122

5.8.1 EL1252, EL1254 - Delivery state  ................................................................................. 122

5.8.2 EL1252, EL1254 - Functioning ...................................................................................... 122

5.8.3 EL1252, EL1254 - Process data.................................................................................... 125

5.8.4 Example programs......................................................................................................... 134

6 Appendix ................................................................................................................................................140

6.1 Firmware compatibility...................................................................................................................140

6.2 Firmware Update EL/ES/EM/ELM/EPxxxx ....................................................................................140

6.2.1 Device description ESI file/XML..................................................................................... 141

6.2.2 Firmware explanation .................................................................................................... 144

6.2.3 Updating controller firmware *.efw................................................................................. 145

6.2.4 FPGA firmware *.rbf....................................................................................................... 146

6.2.5 Simultaneous updating of several EtherCAT devices.................................................... 150

6.3 Restoring the delivery state ...........................................................................................................151

6.4 Support and Service ......................................................................................................................152

EL1202, EL1252, EL12544 Version: 2.8

Foreword

1 Foreword

1.1 Product overview: 2-/4-channel digital input terminals

EL1202 [}15] 1-channel digital input terminal 24VDC, TON/T
EL1202-0100 [}15] 1-channel digital input terminal 24VDC, TON/T

EL1252 [}17] 2-channel digital input terminal 24VDC, with time stamp
EL1252-0050 [}17] 2-channel digital input terminal 5VDC, with time stamp

EL1254 [}17] 4-channel digital input terminal 24VDC, with time

OFF

1μs

1μs, Distributed Clocks

OFF

1.2 Notes on the documentation

Intended audience

This description is only intended for the use of trained specialists in control and automation engineering who
are familiar with the applicable national standards.
It is essential that the documentation and the following notes and explanations are followed when installing
and commissioning these components.
It is the duty of the technical personnel to use the documentation published at the respective time of each
installation and commissioning.

The responsible staff must ensure that the application or use of the products described satisfy all the
requirements for safety, including all the relevant laws, regulations, guidelines and standards.

Disclaimer

The documentation has been prepared with care. The products described are, however, constantly under
development.

We reserve the right to revise and change the documentation at any time and without prior announcement.

No claims for the modification of products that have already been supplied may be made on the basis of the
data, diagrams and descriptions in this documentation.

Trademarks

Beckhoff®, TwinCAT®, EtherCAT®, EtherCATG®, EtherCATG10®, EtherCATP®, SafetyoverEtherCAT®,
TwinSAFE®, XFC®, XTS® and XPlanar® are registered trademarks of and licensed by Beckhoff Automation
GmbH. Other designations used in this publication may be trademarks whose use by third parties for their
own purposes could violate the rights of the owners.

Patent Pending

The EtherCAT Technology is covered, including but not limited to the following patent applications and
patents: EP1590927, EP1789857, EP1456722, EP2137893, DE102015105702 with corresponding
applications or registrations in various other countries.

EtherCAT® is registered trademark and patented technology, licensed by Beckhoff Automation GmbH,
Germany.

EL1202, EL1252, EL1254 5Version: 2.8

Foreword

Copyright

© Beckhoff Automation GmbH & Co. KG, Germany.
The reproduction, distribution and utilization of this document as well as the communication of its contents to
others without express authorization are prohibited.
Offenders will be held liable for the payment of damages. All rights reserved in the event of the grant of a
patent, utility model or design.

EL1202, EL1252, EL12546 Version: 2.8

Foreword

1.3 Safety instructions

Safety regulations

Please note the following safety instructions and explanations!
Product-specific safety instructions can be found on following pages or in the areas mounting, wiring,
commissioning etc.

Exclusion of liability

All the components are supplied in particular hardware and software configurations appropriate for the
application. Modifications to hardware or software configurations other than those described in the
documentation are not permitted, and nullify the liability of Beckhoff Automation GmbH & Co. KG.

Personnel qualification

This description is only intended for trained specialists in control, automation and drive engineering who are
familiar with the applicable national standards.

Description of instructions

In this documentation the following instructions are used.
These instructions must be read carefully and followed without fail!

DANGER

Serious risk of injury!

Failure to follow this safety instruction directly endangers the life and health of persons.

WARNING

Risk of injury!

Failure to follow this safety instruction endangers the life and health of persons.

CAUTION

Personal injuries!

Failure to follow this safety instruction can lead to injuries to persons.

NOTE

Damage to environment/equipment or data loss

Failure to follow this instruction can lead to environmental damage, equipment damage or data loss.

Tip or pointer

This symbol indicates information that contributes to better understanding.

EL1202, EL1252, EL1254 7Version: 2.8

Foreword

1.4 Documentation issue status

Version Comment

2.8 • Addenda chapter "Sensitivity of the input"

• Update structure

2.7 • Correction chapter "EL1252, EL1254 - LEDs and pin assignment"

• Update structure

2.6 • EL1254 added

• Chapter "Beckhoff Identification Code (BIC) " added

2.5 • Update chapter "Commissioning"

2.4 • EL1202-0100 added

• Update chapter "Technical data"

• Update structure

2.3 • Update chapter "Commissioning"

2.2 • Update chapter "Technical data"

• Update chapter "Connection system" ->"Connection"

• Update structure

2.1 • Update chapter "Notes on the documentation"

• Update chapter "Technical data"

• Addenda chapter "Instructions for ESD protection"

• Addenda chapter "Installation instructions for enhanced mechanical load capacity"

• Addenda chapter "ATEX - Special conditions (extended temperature range)"

• Addenda chapter "TwinCAT Quickstart"

• Update chapter "TwinCAT 2.1x" -> "TwinCAT Development Environment"

• Update chapter "EL1252 - Process data"

2.0 • First publication in PDF format

1.8 • Technical data update

1.7 • EL1250-0050 amended

• Structural adaptation

• Technical data update

1.6 • Firmware compatibility list inserted

1.5 • Notes on device description update amended; note on trademarks inserted

1.4 • Description of sample program amended

1.3 • Technical description amended

1.2 • Technical description amended

1.1 • Technical data and safety instructions amended

1.0 • Technical changes added, description of principle amended

0.1 • Provisional documentation for EL1202, EL1252

1.5 Version identification of EtherCAT devices

Designation

A Beckhoff EtherCAT device has a 14-digit designation, made up of

• family key

• type

• version

• revision

EL1202, EL1252, EL12548 Version: 2.8

Foreword

Example Family Type Version Revision

EL3314-0000-0016 EL terminal

(12 mm, non­pluggable connection
level)

ES3602-0010-0017 ES terminal

(12 mm, pluggable
connection level)

CU2008-0000-0000 CU device 2008 (8-port fast ethernet switch) 0000 (basic type) 0000

Notes

• The elements mentioned above result in the technical designation. EL3314-0000-0016 is used in the
example below.

• EL3314-0000 is the order identifier, in the case of “-0000” usually abbreviated to EL3314. “-0016” is the
EtherCAT revision.

• The order identifier is made up of

- family key (EL, EP, CU, ES, KL, CX, etc.)

- type (3314)

- version (-0000)

• The revision -0016 shows the technical progress, such as the extension of features with regard to the
EtherCAT communication, and is managed by Beckhoff.
In principle, a device with a higher revision can replace a device with a lower revision, unless specified
otherwise, e.g. in the documentation.
Associated and synonymous with each revision there is usually a description (ESI, EtherCAT Slave
Information) in the form of an XML file, which is available for download from the Beckhoff web site.
From 2014/01 the revision is shown on the outside of the IP20 terminals, see Fig. “EL5021 EL terminal,
standard IP20 IO device with batch number and revision ID (since 2014/01)”.

• The type, version and revision are read as decimal numbers, even if they are technically saved in
hexadecimal.

3314 (4-channel thermocouple
terminal)

3602 (2-channel voltage
measurement)

0000 (basic type) 0016

0010 (high­precision version)

0017

Identification number

Beckhoff EtherCAT devices from the different lines have different kinds of identification numbers:

Production lot/batch number/serial number/date code/D number

The serial number for Beckhoff IO devices is usually the 8-digit number printed on the device or on a sticker.
The serial number indicates the configuration in delivery state and therefore refers to a whole production
batch, without distinguishing the individual modules of a batch.

Structure of the serial number: KKYYFFHH

KK - week of production (CW, calendar week)
YY - year of production
FF - firmware version
HH - hardware version

Example with
Ser. no.: 12063A02: 12 - production week 12 06 - production year 2006 3A - firmware version 3A 02 ­hardware version 02

Exceptions can occur in the IP67 area, where the following syntax can be used (see respective device
documentation):

Syntax: D ww yy x y z u

D - prefix designation
ww - calendar week
yy - year
x - firmware version of the bus PCB

EL1202, EL1252, EL1254 9Version: 2.8

Foreword

y - hardware version of the bus PCB
z - firmware version of the I/O PCB
u - hardware version of the I/O PCB

Example: D.22081501 calendar week 22 of the year 2008 firmware version of bus PCB: 1 hardware version
of bus PCB: 5 firmware version of I/O PCB: 0 (no firmware necessary for this PCB) hardware version of I/O
PCB: 1

Unique serial number/ID, ID number

In addition, in some series each individual module has its own unique serial number.

See also the further documentation in the area

• IP67: EtherCAT Box

• Safety: TwinSafe

• Terminals with factory calibration certificate and other measuring terminals

Examples of markings

Fig.1: EL5021 EL terminal, standard IP20 IO device with serial/ batch number and revision ID (since
2014/01)

Fig.2: EK1100 EtherCAT coupler, standard IP20 IO device with serial/ batch number

EL1202, EL1252, EL125410 Version: 2.8

Fig.3: CU2016 switch with serial/ batch number

Foreword

Fig.4: EL3202-0020 with serial/ batch number 26131006 and unique ID-number 204418

Fig.5: EP1258-00001 IP67 EtherCAT Box with batch number/ date code 22090101 and unique serial
number 158102

Fig.6: EP1908-0002 IP67 EtherCAT Safety Box with batch number/ date code 071201FF and unique serial
number 00346070

EL1202, EL1252, EL1254 11Version: 2.8

Foreword

Fig.7: EL2904 IP20 safety terminal with batch number/ date code 50110302 and unique serial number
00331701

Fig.8: ELM3604-0002 terminal with unique ID number (QR code) 100001051 and serial/ batch number
44160201

EL1202, EL1252, EL125412 Version: 2.8

Foreword

1.5.1 Beckhoff Identification Code (BIC)

The Beckhoff Identification Code (BIC) is increasingly being applied to Beckhoff products to uniquely identify
the product. The BIC is represented as a Data Matrix Code (DMC, code scheme ECC200), the content is
based on the ANSI standard MH10.8.2-2016.

Fig.9: BIC as data matrix code (DMC, code scheme ECC200)

The BIC will be introduced step by step across all product groups.

Depending on the product, it can be found in the following places:

• on the packaging unit

• directly on the product (if space suffices)

• on the packaging unit and the product

The BIC is machine-readable and contains information that can also be used by the customer for handling
and product management.

Each piece of information can be uniquely identified using the so-called data identifier
(ANSIMH10.8.2-2016). The data identifier is followed by a character string. Both together have a maximum
length according to the table below. If the information is shorter, spaces are added to it. The data under
positions 1 to 4 are always available.

The following information is contained:

EL1202, EL1252, EL1254 13Version: 2.8

Foreword

Item

Type of

no.

information

1 Beckhoff order

number

2 Beckhoff Traceability

Number (BTN)

3 Article description Beckhoff article

4 Quantity Quantity in packaging

5 Batch number Optional: Year and week

6 ID/serial number Optional: Present-day

7 Variant number Optional: Product variant

...

Explanation Data

Beckhoff order number 1P 8 1P072222

Unique serial number,
see note below

description, e.g.
EL1008

unit, e.g. 1, 10, etc.

of production

serial number system,
e.g. with safety products

number on the basis of
standard products

Number of digits

identifier

S 12 SBTNk4p562d7

1K 32 1KEL1809

Q 6 Q1

2P 14 2P401503180016

51S 12 51S678294104

30P 32 30PF971, 2*K183

incl. data identifier

Example

Further types of information and data identifiers are used by Beckhoff and serve internal processes.

Structure of the BIC

Example of composite information from item 1 to 4 and 6. The data identifiers are marked in red for better
display:

BTN

An important component of the BIC is the Beckhoff Traceability Number (BTN, item no.2). The BTN is a
unique serial number consisting of eight characters that will replace all other serial number systems at
Beckhoff in the long term (e.g. batch designations on IO components, previous serial number range for
safety products, etc.). The BTN will also be introduced step by step, so it may happen that the BTN is not yet
coded in the BIC.

NOTE

This information has been carefully prepared. However, the procedure described is constantly being further
developed. We reserve the right to revise and change procedures and documentation at any time and with­out prior notice. No claims for changes can be made from the information, illustrations and descriptions in
this information.

EL1202, EL1252, EL125414 Version: 2.8

2 Product overview

2.1 EL1202

2.1.1 EL1202 - Introduction

Product overview

Fig.10: EL1202

2-channel digital input terminal 24 VDC, TON/T

The EL1202 digital input terminal acquires the binary control signals from the process level and transmits
them, in an electrically isolated form, to the higher-level automation unit. It is suitable for particularly fast
signals due to its very low input delay. For the EL1202-0100 variant, Distributed Clocks are activated, i.e. the
input data can be monitored synchronous with other data that are also linked to distributed clock terminals.
Therefore, the accuracy across the system is <<1µs. The EL1202 contains two channels, the signal state of
which is indicated via LEDs.

Quick links

• EtherCAT function principles

• LEDs and pin assignment [}40]

• Commissioning [}42]

OFF

 1μs

EL1202, EL1252, EL1254 15Version: 2.8

Product overview

2.1.2 EL1202 - Technical data

Technical data EL1202-0000 EL1202-0100

Digital inputs 2

Nominal voltage of the inputs 24VDC (-15%/+20%)

Signal voltage "0" -3V… +5V (based on EN 61131-2, type 3)

Signal voltage "1" +11V… +30V (based on EN 61131-2, type 3)

Input current typ. 3mA (based on EN 61131-2, type 3)

Input delay TON/T

OFF

Distributed Clocks (DC) no yes

Power supply for the electronics via the E-Bus

Current consumption from the E-bus typ. 110mA

Electrical isolation 500V (E-bus/field voltage)

Bit width in the process image 2 input bits

Configuration no address or configuration settings required

Weight approx. 55g

Permissible ambient temperature range
during operation

Permissible ambient temperature range
during storage

Permissible relative humidity 95%, no condensation

Dimensions (W x H x D) approx. 15mm x 100mm x 70mm (width aligned: 12mm)

Mounting [}26]

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

Protection class IP20

Installation position variable

Approval CE

< 1µs

0°C ... +55°C

-25°C ... +85°C

on 35mm mounting rail conforms to EN 60715

see also installation instructions for enhanced mechanical load

capacity [}30]

ATEX [}37]
cULus [}39]

EL1202, EL1252, EL125416 Version: 2.8

2.2 EL1252, EL1254

2.2.1 EL1252, EL1254 - Introduction

Product overview

Fig.11: EL1252, EL1252-0050 and EL1254

2-/4-channel digital input terminal with time stamp

The EL1252 and EL1254 digital input terminals acquire the fast binary control signals from the process level
and transmits them, in an electrically isolated form, to the controller. The signals are furnished with a time
stamp that identifies the time of the last edge change with a resolution of 1ns. This technology enables
signals to be traced exactly over time and synchronized with the distributed clocks across the system. With
this technology, machine-wide parallel hardware wiring of digital inputs or encoder signals for
synchronization purposes is often no longer required. In conjunction with the EL2252 EtherCAT Terminal
(digital output terminal with time stamp), the EL1252/EL1254 enables responses with equidistant time
intervals, largely independent of the bus cycle time.

In the EL1252-0050 a variant is provided with a 5V input voltage (TTL level).

Quick links

• EtherCAT function principles

• LEDs and pin assignment [}41]

• Commissioning [}42]

EL1202, EL1252, EL1254 17Version: 2.8

Product overview

2.2.2 EL1252, EL1254 - Technical data

Technical data EL1252-0000 EL1252-0050 EL1254-0000

digital inputs 2 4

Nominal voltage of the inputs 24VDC (-15%/+20%) 5VDC (-15%/+20%) 24VDC (-15%/+20%)

Signal voltage "0" -3V … +5V

(based on EN
61131-2, type 3)

Signal voltage "1" +11V … +30V

(based on EN
61131-2, type 3)

Input current typ. 3mA

(based on EN
61131-2, type 3)

Input delay TON/T

Time stamp resolution 1ns

Time stamp accuracy in the terminal 10ns (+ input delay)

Distributed Clocks (DC) accuracy << 1µs

Power supply for the electronics via the E-Bus

Current consumption from the E-bus typ. 110mA typ. 90mA typ. 110mA

Electrical isolation 500V (E-bus/field voltage)

Bit width in the process image 2 input bits + 2 time stamps 4 input bits + 8 time

Configuration no address or configuration settings required

Weight approx. 55g

Permissible ambient temperature range
during operation

Permissible ambient temperature range
during storage

Permissible relative humidity 95%, no condensation

Dimensions (W x H x D) approx. 15mm x 100mm x 70mm (width aligned: 12mm)

Mounting [}26]

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

Protection class IP20

Installation position variable

Approval CE

OFF

< 1µs

-25°C ... +60°C
(extended temperature
range)

-40°C ... +85°C -25°C ... +85°C

on 35mm mounting rail conforms to EN 60715

see also installation instructions for enhanced mechanical load

capacity [}30]

ATEX [}38]
cULus [}39]

< 0.8V -3V … +5V

(based on EN
61131-2, type 3)

>2.4V +11V … +30V

(based on EN
61131-2, type 3)

typ. 50µA typ. 3mA

(based on EN
61131-2, type 3)

stamps

0°C ... +55°C

CE

2.3 Start

For commissioning:

• install the EL12xx as described in the Mounting and wiring [}26] section

• Configure the EL12xx in TwinCAT as described in section Commissioning [}42].

EL1202, EL1252, EL125418 Version: 2.8

Basics communication

3 Basics communication

3.1 EtherCAT basics

Please refer to the EtherCAT System Documentation for the EtherCAT fieldbus basics.

3.2 EtherCAT cabling – wire-bound

The cable length between two EtherCAT devices must not exceed 100 m. This results from the FastEthernet
technology, which, above all for reasons of signal attenuation over the length of the cable, allows a maximum

link length of 5 + 90 + 5 m if cables with appropriate properties are used. See also the Design
recommendations for the infrastructure for EtherCAT/Ethernet.

Cables and connectors

For connecting EtherCAT devices only Ethernet connections (cables + plugs) that meet the requirements of
at least category 5 (CAt5) according to EN 50173 or ISO/IEC 11801 should be used. EtherCAT uses 4 wires
for signal transfer.

EtherCAT uses RJ45 plug connectors, for example. The pin assignment is compatible with the Ethernet
standard (ISO/IEC 8802-3).

Pin Color of conductor Signal Description

1 yellow TD + Transmission Data +

2 orange TD - Transmission Data -

3 white RD + Receiver Data +

6 blue RD - Receiver Data -

Due to automatic cable detection (auto-crossing) symmetric (1:1) or cross-over cables can be used between
EtherCAT devices from Beckhoff.

Recommended cables

Suitable cables for the connection of EtherCAT devices can be found on the Beckhoff website!

E-Bus supply

A bus coupler can supply the EL terminals added to it with the E-bus system voltage of 5V; a coupler is
thereby loadable up to 2A as a rule (see details in respective device documentation).
Information on how much current each EL terminal requires from the E-bus supply is available online and in
the catalogue. If the added terminals require more current than the coupler can supply, then power feed

terminals (e.g. EL9410) must be inserted at appropriate places in the terminal strand.

The pre-calculated theoretical maximum E-Bus current is displayed in the TwinCAT System Manager. A
shortfall is marked by a negative total amount and an exclamation mark; a power feed terminal is to be
placed before such a position.

EL1202, EL1252, EL1254 19Version: 2.8

Basics communication

Fig.12: System manager current calculation

NOTE

Malfunction possible!

The same ground potential must be used for the E-Bus supply of all EtherCAT terminals in a terminal block!

3.3 General notes for setting the watchdog

ELxxxx terminals are equipped with a safety feature (watchdog) that switches off the outputs after a
specifiable time e.g. in the event of an interruption of the process data traffic, depending on the device and
settings, e.g. in OFF state.

The EtherCAT slave controller (ESC) in the EL2xxx terminals features two watchdogs:

• SM watchdog (default: 100 ms)

• PDI watchdog (default: 100 ms)

SM watchdog (SyncManager Watchdog)

The SyncManager watchdog is reset after each successful EtherCAT process data communication with the
terminal. If no EtherCAT process data communication takes place with the terminal for longer than the set
and activated SM watchdog time, e.g. in the event of a line interruption, the watchdog is triggered and the
outputs are set to FALSE. The OP state of the terminal is unaffected. The watchdog is only reset after a
successful EtherCAT process data access. Set the monitoring time as described below.

The SyncManager watchdog monitors correct and timely process data communication with the ESC from the
EtherCAT side.

PDI watchdog (Process Data Watchdog)

If no PDI communication with the EtherCAT slave controller (ESC) takes place for longer than the set and
activated PDI watchdog time, this watchdog is triggered.
PDI (Process Data Interface) is the internal interface between the ESC and local processors in the EtherCAT
slave, for example. The PDI watchdog can be used to monitor this communication for failure.

The PDI watchdog monitors correct and timely process data communication with the ESC from the
application side.

The settings of the SM- and PDI-watchdog must be done for each slave separately in the TwinCAT System
Manager.

EL1202, EL1252, EL125420 Version: 2.8

Basics communication

Fig.13: EtherCAT tab -> Advanced Settings -> Behavior -> Watchdog

Notes:

• the multiplier is valid for both watchdogs.

• each watchdog has its own timer setting, the outcome of this in summary with the multiplier is a
resulting time.

• Important: the multiplier/timer setting is only loaded into the slave at the start up, if the checkbox is
activated.
If the checkbox is not activated, nothing is downloaded and the ESC settings remain unchanged.

Multiplier

Multiplier

Both watchdogs receive their pulses from the local terminal cycle, divided by the watchdog multiplier:

1/25 MHz * (watchdog multiplier + 2) = 100µs (for default setting of 2498 for the multiplier)

The standard setting of 1000 for the SM watchdog corresponds to a release time of 100ms.

The value in multiplier + 2 corresponds to the number of basic 40 ns ticks representing a watchdog tick.
The multiplier can be modified in order to adjust the watchdog time over a larger range.

EL1202, EL1252, EL1254 21Version: 2.8

Basics communication

Example “Set SM watchdog”

This checkbox enables manual setting of the watchdog times. If the outputs are set and the EtherCAT
communication is interrupted, the SM watchdog is triggered after the set time and the outputs are erased.
This setting can be used for adapting a terminal to a slower EtherCAT master or long cycle times. The
default SM watchdog setting is 100ms. The setting range is 0...65535. Together with a multiplier with a
range of 1...65535 this covers a watchdog period between 0...~170 seconds.

Calculation

Multiplier = 2498 → watchdog base time = 1 / 25MHz * (2498 + 2) = 0.0001seconds = 100µs
SM watchdog = 10000 → 10000 * 100µs = 1second watchdog monitoring time

CAUTION

Undefined state possible!

The function for switching off of the SM watchdog via SM watchdog = 0 is only implemented in terminals
from version -0016. In previous versions this operating mode should not be used.

CAUTION

Damage of devices and undefined state possible!

If the SM watchdog is activated and a value of 0 is entered the watchdog switches off completely. This is
the deactivation of the watchdog! Set outputs are NOT set in a safe state, if the communication is inter­rupted.

3.4 EtherCAT State Machine

The state of the EtherCAT slave is controlled via the EtherCAT State Machine (ESM). Depending upon the
state, different functions are accessible or executable in the EtherCAT slave. Specific commands must be
sent by the EtherCAT master to the device in each state, particularly during the bootup of the slave.

A distinction is made between the following states:

• Init

• Pre-Operational

• Safe-Operational and

• Operational

• Boot

The regular state of each EtherCAT slave after bootup is the OP state.

EL1202, EL1252, EL125422 Version: 2.8

Fig.14: States of the EtherCAT State Machine

Basics communication

Init

After switch-on the EtherCAT slave in the Init state. No mailbox or process data communication is possible.
The EtherCAT master initializes sync manager channels 0 and 1 for mailbox communication.

Pre-Operational (Pre-Op)

During the transition between Init and Pre-Op the EtherCAT slave checks whether the mailbox was initialized
correctly.

In Pre-Op state mailbox communication is possible, but not process data communication. The EtherCAT
master initializes the sync manager channels for process data (from sync manager channel 2), the FMMU
channels and, if the slave supports configurable mapping, PDO mapping or the sync manager PDO
assignment. In this state the settings for the process data transfer and perhaps terminal-specific parameters
that may differ from the default settings are also transferred.

Safe-Operational (Safe-Op)

During transition between Pre-Op and Safe-Op the EtherCAT slave checks whether the sync manager
channels for process data communication and, if required, the distributed clocks settings are correct. Before
it acknowledges the change of state, the EtherCAT slave copies current input data into the associated DP­RAM areas of the EtherCAT slave controller (ECSC).

In Safe-Op state mailbox and process data communication is possible, although the slave keeps its outputs
in a safe state, while the input data are updated cyclically.

Outputs in SAFEOP state

The default set watchdog [}20] monitoring sets the outputs of the module in a safe state - depend­ing on the settings in SAFEOP and OP - e.g. in OFF state. If this is prevented by deactivation of the
watchdog monitoring in the module, the outputs can be switched or set also in the SAFEOP state.

Operational (Op)

Before the EtherCAT master switches the EtherCAT slave from Safe-Op to Op it must transfer valid output
data.

In the Op state the slave copies the output data of the masters to its outputs. Process data and mailbox
communication is possible.

EL1202, EL1252, EL1254 23Version: 2.8

Basics communication

Boot

In the Boot state the slave firmware can be updated. The Boot state can only be reached via the Init state.

In the Boot state mailbox communication via the file access over EtherCAT (FoE) protocol is possible, but no
other mailbox communication and no process data communication.

3.5 CoE - Interface: notes

This device has no CoE.

Detailed information on the CoE interface can be found in the EtherCAT system documentation on the
Beckhoff website.

EL1202, EL1252, EL125424 Version: 2.8

Basics communication

3.6 Distributed Clock

The distributed clock represents a local clock in the EtherCAT slave controller (ESC) with the following
characteristics:

• Unit 1 ns

• Zero point 1.1.2000 00:00

• Size 64 bit (sufficient for the next 584 years; however, some EtherCAT slaves only offer 32-bit support,
i.e. the variable overflows after approx. 4.2 seconds)

• The EtherCAT master automatically synchronizes the local clock with the master clock in the EtherCAT
bus with a precision of < 100 ns.

For detailed information please refer to the EtherCAT system description.

EL1202, EL1252, EL1254 25Version: 2.8

Mounting and wiring

4 Mounting and wiring

4.1 Instructions for ESD protection

NOTE

Destruction of the devices by electrostatic discharge possible!

The devices contain components at risk from electrostatic discharge caused by improper handling.

• Please ensure you are electrostatically discharged and avoid touching the contacts of the device directly.

• Avoid contact with highly insulating materials (synthetic fibers, plastic film etc.).

• Surroundings (working place, packaging and personnel) should by grounded probably, when handling
with the devices.

• Each assembly must be terminated at the right hand end with an EL9011 or EL9012 bus end cap, to en­sure the protection class and ESD protection.

Fig.15: Spring contacts of the Beckhoff I/O components

4.2 Installation on mounting rails

WARNING

Risk of electric shock and damage of device!

Bring the bus terminal system into a safe, powered down state before starting installation, disassembly or
wiring of the bus terminals!

EL1202, EL1252, EL125426 Version: 2.8

Assembly

Mounting and wiring

Fig.16: Attaching on mounting rail

The bus coupler and bus terminals are attached to commercially available 35mm mounting rails (DIN rails
according to EN60715) by applying slight pressure:

1. First attach the fieldbus coupler to the mounting rail.

2. The bus terminals are now attached on the right-hand side of the fieldbus coupler. Join the compo­nents with tongue and groove and push the terminals against the mounting rail, until the lock clicks
onto the mounting rail.
If the terminals are clipped onto the mounting rail first and then pushed together without tongue and
groove, the connection will not be operational! When correctly assembled, no significant gap should
be visible between the housings.

Fixing of mounting rails

The locking mechanism of the terminals and couplers extends to the profile of the mounting rail. At
the installation, the locking mechanism of the components must not come into conflict with the fixing
bolts of the mounting rail. To mount the mounting rails with a height of 7.5mm under the terminals
and couplers, you should use flat mounting connections (e.g. countersunk screws or blind rivets).

EL1202, EL1252, EL1254 27Version: 2.8

Mounting and wiring

Disassembly

Fig.17: Disassembling of terminal

Each terminal is secured by a lock on the mounting rail, which must be released for disassembly:

1. Pull the terminal by its orange-colored lugs approximately 1cm away from the mounting rail. In doing
so for this terminal the mounting rail lock is released automatically and you can pull the terminal out of
the bus terminal block easily without excessive force.

2. Grasp the released terminal with thumb and index finger simultaneous at the upper and lower grooved
housing surfaces and pull the terminal out of the bus terminal block.

Connections within a bus terminal block

The electric connections between the Bus Coupler and the Bus Terminals are automatically realized by
joining the components:

• The six spring contacts of the K-Bus/E-Bus deal with the transfer of the data and the supply of the Bus
Terminal electronics.

• The power contacts deal with the supply for the field electronics and thus represent a supply rail within
the bus terminal block. The power contacts are supplied via terminals on the Bus Coupler (up to 24V)
or for higher voltages via power feed terminals.

Power Contacts

During the design of a bus terminal block, the pin assignment of the individual Bus Terminals must
be taken account of, since some types (e.g. analog Bus Terminals or digital 4-channel Bus Termi­nals) do not or not fully loop through the power contacts. Power Feed Terminals (KL91xx, KL92xx
or EL91xx, EL92xx) interrupt the power contacts and thus represent the start of a new supply rail.

PE power contact

The power contact labeled PE can be used as a protective earth. For safety reasons this contact mates first
when plugging together, and can ground short-circuit currents of up to 125A.

EL1202, EL1252, EL125428 Version: 2.8

Fig.18: Power contact on left side

Mounting and wiring

NOTE

Possible damage of the device

Note that, for reasons of electromagnetic compatibility, the PE contacts are capacitatively coupled to the
mounting rail. This may lead to incorrect results during insulation testing or to damage on the terminal (e.g.
disruptive discharge to the PE line during insulation testing of a consumer with a nominal voltage of 230V).
For insulation testing, disconnect the PE supply line at the Bus Coupler or the Power Feed Terminal! In or­der to decouple further feed points for testing, these Power Feed Terminals can be released and pulled at
least 10mm from the group of terminals.

WARNING

Risk of electric shock!

The PE power contact must not be used for other potentials!

EL1202, EL1252, EL1254 29Version: 2.8

Mounting and wiring

4.3 Installation instructions for enhanced mechanical load capacity

WARNING

Risk of injury through electric shock and damage to the device!

Bring the Bus Terminal system into a safe, de-energized state before starting mounting, disassembly or
wiring of the Bus Terminals!

Additional checks

The terminals have undergone the following additional tests:

Verification Explanation

Vibration 10 frequency runs in 3 axes

6 Hz < f < 60 Hz displacement 0.35 mm, constant amplitude

60.1Hz<f<500Hz acceleration 5g, constant amplitude

Shocks 1000 shocks in each direction, in 3 axes

25 g, 6 ms

Additional installation instructions

For terminals with enhanced mechanical load capacity, the following additional installation instructions apply:

• The enhanced mechanical load capacity is valid for all permissible installation positions

• Use a mounting rail according to EN 60715 TH35-15

• Fix the terminal segment on both sides of the mounting rail with a mechanical fixture, e.g. an earth
terminal or reinforced end clamp

• The maximum total extension of the terminal segment (without coupler) is:
64 terminals (12mm mounting with) or 32 terminals (24mm mounting with)

• Avoid deformation, twisting, crushing and bending of the mounting rail during edging and installation of
the rail

• The mounting points of the mounting rail must be set at 5 cm intervals

• Use countersunk head screws to fasten the mounting rail

• The free length between the strain relief and the wire connection should be kept as short as possible. A
distance of approx. 10cm should be maintained to the cable duct.

4.4 Connection

4.4.1 Connection system

WARNING

Risk of electric shock and damage of device!

Bring the bus terminal system into a safe, powered down state before starting installation, disassembly or
wiring of the bus terminals!

Overview

The Bus Terminal system offers different connection options for optimum adaptation to the respective
application:

• The terminals of ELxxxx and KLxxxx series with standard wiring include electronics and connection
level in a single enclosure.

EL1202, EL1252, EL125430 Version: 2.8