Beckhoff EL47 Series Operator's manual

Documentation
EL47xx
Analog output terminal with oversampling
2.7
2020-02-27
Version:
Date:

Table of contents
EL47xx 3Version: 2.7
Table of contents
1 Foreword ....................................................................................................................................................5
1.1 Product overview analog output 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 Introduction......................................................................................................................................15
2.2 Technical data .................................................................................................................................16
3 Basics communication ...........................................................................................................................17
3.1 EtherCAT basics..............................................................................................................................17
3.2 EtherCAT cabling – wire-bound.......................................................................................................17
3.3 General notes for setting the watchdog...........................................................................................18
3.4 EtherCAT State Machine.................................................................................................................20
3.5 CoE - Interface: notes......................................................................................................................22
3.6 Distributed Clock .............................................................................................................................23
4 Mounting and wiring................................................................................................................................24
4.1 Instructions for ESD protection........................................................................................................24
4.2 Installation on mounting rails ...........................................................................................................24
4.3 Installation instructions for enhanced mechanical load capacity .....................................................28
4.4 Connection system ..........................................................................................................................28
4.5 Installation positions ........................................................................................................................31
4.6 Positioning of passive Terminals .....................................................................................................34
4.7 ATEX - Special conditions (standard temperature range) ...............................................................35
4.8 ATEX - Special conditions (extended temperature range) ..............................................................36
4.9 ATEX Documentation ......................................................................................................................37
4.10 UL notice .........................................................................................................................................37
4.11 EL4712, EL4732 - LEDs and connection ........................................................................................38
5 Commissioning........................................................................................................................................41
5.1 TwinCAT Quick Start .......................................................................................................................41
5.1.1 TwinCAT2 ....................................................................................................................... 44
5.1.2 TwinCAT 3 ....................................................................................................................... 54
5.2 TwinCAT Development Environment ..............................................................................................66
5.2.1 Installation of the TwinCAT real-time driver..................................................................... 66
5.2.2 Notes regarding ESI device description........................................................................... 72
5.2.3 TwinCAT ESI Updater ..................................................................................................... 76
5.2.4 Distinction between Online and Offline............................................................................ 76
5.2.5 OFFLINE configuration creation ...................................................................................... 77
5.2.6 ONLINE configuration creation ........................................................................................ 82
5.2.7 EtherCAT subscriber configuration.................................................................................. 90
5.3 General Notes - EtherCAT Slave Application..................................................................................99
5.4 Oversampling terminals/boxes and TwinCAT Scope ....................................................................108

Table of contents
EL47xx4 Version: 2.7
5.4.1 TwinCAT 3 procedure.................................................................................................... 109
5.4.2 TwinCAT 2 procedure.................................................................................................... 117
5.5 Notices on analog specifications ...................................................................................................126
5.5.1 Full scale value (FSV).................................................................................................... 126
5.5.2 Measuring error/ measurement deviation ...................................................................... 126
5.5.3 Temperature coefficient tK [ppm/K] ............................................................................... 127
5.5.4 Single-ended/differential typification .............................................................................. 128
5.5.5 Common-mode voltage and reference ground (based on differential inputs)................ 133
5.5.6 Dielectric strength .......................................................................................................... 133
5.5.7 Temporal aspects of analog/digital conversion.............................................................. 134
5.6 Basic function principles ................................................................................................................137
5.6.1 General .......................................................................................................................... 137
5.6.2 Oversampling................................................................................................................. 137
5.6.3 Distributed Clock............................................................................................................ 137
5.6.4 Time-related cooperation with other terminals............................................................... 139
5.6.5 Interference from equipment.......................................................................................... 140
5.7 Creation of the TwinCAT configuration .........................................................................................141
5.8 Process data and configuration .....................................................................................................145
5.8.1 Process data.................................................................................................................. 145
5.8.2 TwinCAT tree................................................................................................................. 145
5.8.3 Extent of process data in delivery state ......................................................................... 148
5.8.4 Oversampling settings, distributed clocks (DC) ............................................................. 151
5.9 Application notes for EL47xx .........................................................................................................158
6 Appendix ................................................................................................................................................159
6.1 EtherCAT AL Status Codes...........................................................................................................159
6.2 Firmware information for EL37xx/EL47xx......................................................................................159
6.3 Firmware compatibility...................................................................................................................160
6.4 Firmware Update EL/ES/EM/ELM/EPxxxx ....................................................................................160
6.4.1 Device description ESI file/XML..................................................................................... 161
6.4.2 Firmware explanation .................................................................................................... 164
6.4.3 Updating controller firmware *.efw................................................................................. 165
6.4.4 FPGA firmware *.rbf....................................................................................................... 167
6.4.5 Simultaneous updating of several EtherCAT devices.................................................... 171
6.5 Restoring the delivery state ...........................................................................................................172
6.6 Support and Service ......................................................................................................................173

Foreword
EL47xx 5Version: 2.7
1 Foreword
1.1 Product overview analog output terminals
EL4712 [}15]
Two-channel analog output terminal, 0 ... 20mA with oversampling
EL4732 [}15]
Two-channel analog output terminal, -10V … +10V with oversampling
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.

Foreword
EL47xx6 Version: 2.7
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.

Foreword
EL47xx 7Version: 2.7
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.

Foreword
EL47xx8 Version: 2.7
1.4 Documentation issue status
Version Comment
2.7 • Update chapter “UL notice”
• Update chapter “Firmware compatibility”
• Update structure
2.6 • Update Technical data
• Update structure
• Update revision status
2.5 • Update chapter "Technical data"
2.4 • Update chapter "Technical data"
• Addenda chapter "Instructions for ESD protection"
• Chapter "ATEX - Special conditions" replaced with chapter "ATEX - Special conditions
(standard temperature range)"
• Addenda chapter "ATEX - Special conditions (extended temperature range)"
• Update chapter "Notices on Analog specification"
• Update revision status
2.3 • Update chapter "Commissioning"
2.2 • Update chapter "Notes on the documentation"
• Update of Technical data
• Update chapter "TwinCAT 2.1x" -> "TwinCAT Development Environment" and "TwinCAT
Quick Start"
2.1 • Chapter “Oversampling terminals and TwinCAT Scope” added
2.0 • Migration
• Update structure
1.6 • Update chapter "Technical data"
• Addenda chapter "Installation instructions for enhanced mechanical load capacity"
• Update structure
• Update revision status
1.5 • Update structure
• Update chapter "Technical data"
1.4 • Update structure
1.3 • Technical notes added
1.2 • EL4712 amended
1.1 • Safety instructions updated
1.0 • Slight corrections; first public issue
0.1 • Preliminary documentation for EL4732
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

Foreword
EL47xx 9Version: 2.7
Example Family Type Version Revision
EL3314-0000-0016 EL terminal
(12 mm, non-
pluggable connection
level)
3314 (4-channel thermocouple
terminal)
0000 (basic type) 0016
ES3602-0010-0017 ES terminal
(12 mm, pluggable
connection level)
3602 (2-channel voltage
measurement)
0010 (high-
precision version)
0017
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.
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

Foreword
EL47xx10 Version: 2.7
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

Foreword
EL47xx 11Version: 2.7
Fig.3: CU2016 switch with serial/ batch number
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

Foreword
EL47xx12 Version: 2.7
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

Foreword
EL47xx 13Version: 2.7
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:

Foreword
EL47xx14 Version: 2.7
Item
no.
Type of
information
Explanation Data
identifier
Number of digits
incl. data identifier
Example
1 Beckhoff order
number
Beckhoff order number 1P 8 1P072222
2 Beckhoff Traceability
Number (BTN)
Unique serial number,
see note below
S 12 SBTNk4p562d7
3 Article description Beckhoff article
description, e.g.
EL1008
1K 32 1KEL1809
4 Quantity Quantity in packaging
unit, e.g. 1, 10, etc.
Q 6 Q1
5 Batch number Optional: Year and week
of production
2P 14 2P401503180016
6 ID/serial number Optional: Present-day
serial number system,
e.g. with safety products
51S 12 51S678294104
7 Variant number Optional: Product variant
number on the basis of
standard products
30P 32 30PF971, 2*K183
...
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 with-
out prior notice. No claims for changes can be made from the information, illustrations and descriptions in
this information.

Product overview
EL47xx 15Version: 2.7
2 Product overview
2.1 Introduction
Fig.10: EL4712, EL4732
Two-channel analog output terminal with oversampling
For each microcycle, the EtherCAT Terminal receives a process data block which are output consecutively.
The timebase of the terminal can be synchronized precisely with other EtherCAT devices via distributed
clocks. This procedure enables the temporal resolution of the analog output signals to be increased to n
times the bus cycle time.
In conjunction with the EL37xx (analog input terminal with oversampling), responses with equidistant time
intervals, e.g. in the event of a threshold value being exceeded, become possible. The EL4732 device can
output a maximum of 100,000 values (100 ksamples/s) per channel and second.
EL4712; 0 ... 20 mA output current
The analog output terminal generates signals in the range 0 to 20mA. The current is set by the process with
a resolution of 16bit (including sign) and output in electrically isolated form.
The output channels have a common ground potential. The output data are output with a configurable,
integer multiple (oversampling factor: n) of the bus cycle time (n microcycles per bus cycle).
EL4732; -10 ... +10 V output voltage
The analog output terminal generates signals in the range -10 to +10 V. The voltage is set by the process
with a resolution of 16bit and output in electrically isolated form.
The output channels have a common ground potential. The output data are output with a configurable,
integer multiple (oversampling factor: n) of the bus cycle time (n microcycles per bus cycle).
Quick links
•EtherCAT basics
•EL47xx basics [}137]
•Process data and configuration [}145]
•Application notes [}158]
• Sample program (https://infosys.beckhoff.com/content/1033/el47xx/Resources/zip/2409495947.zip)

Product overview
EL47xx16 Version: 2.7
2.2 Technical data
Technical data EL4712 EL4732
Number of outputs 2
Signal voltage 0mA ... 20mA -10V ... +10V
Oversampling factor n = integer multiple of the EtherCAT cycle time, configurable between 1
and 100
Distributed Clocks precision < 100ns
Load < 500Ω (short-circuit-proof) > 5kΩ (short-circuit-proof)
Resolution 16 bit (including sign)
Conversion time ~ 10µs
Output rate max. 100ksamples/s
Measuring error < ± 0.1% (in relation to the
output end value)
< ± 0.1% (at 0 °C ... +55 °C, relative to the
full scale value)
< ± 0.2% (when the extended temperature
range is used)
Electrical isolation 500 V (E-bus/field voltage)
Supply voltage for electronics via E-bus
Current consumption power
contacts
typ. 20mA + load -
Power supply for outputs via 24V power contacts via E-bus
Current consumption via E-bus typ. 100mA typ. 180mA
Bit width in process image Output: n x 2 x 16bit data, 2 x 16bit CycleCounter, 4byte
StartTimeNextOutput, if required
Configuration via TwinCAT System Manager
Weight approx. 65g approx. 50g
Permissible ambient
temperature range during
operation
0°C ... + 55°C -25°C ... +60°C
(extended temperature range)
Permissible ambient
temperature range during
storage
-25°C ... + 85°C -40°C ... +85°C
Permissible relative humidity 95%, no condensation 95%, no condensation
Dimensions (W x H x D) approx. 15mm x 100mm x 70mm (width aligned: 12mm)
Mounting [}24] on 35 mm mounting rail conforms to EN 60715
Vibration/shock resistance conforms to EN 60068-2-6 / EN 60068-2-27,
see also installation instructions [}28] for enhanced mechanical load
capacity
EMC immunity/emission conforms to EN 61000-6-2 / EN 61000-6-4
Protection class IP20
Installation position variable
Approval CE
cULus [}37]
ATEX [}35] (standard
temperature range)
CE
cULus [}37]
ATEX [}36] (extended temperature
range)
IECEx

Basics communication
EL47xx 17Version: 2.7
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.

Basics communication
EL47xx18 Version: 2.7
Fig.11: 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 2 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.

Basics communication
EL47xx 19Version: 2.7
Fig.12: 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.

Basics communication
EL47xx20 Version: 2.7
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 inter-
rupted.
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.