Beckhoff EL3751 Operator's manual

Short documentation | EN
EL3751
1-channel multi-functional input for measurement technology, 24 bit, 10
ksps
2023-06-15 | Version: 3.9

Table of contents
EL3751 3Version: 3.9
Table of contents
1 Foreword....................................................................................................................................................7
1.1 Notes on the documentation .............................................................................................................7
1.2 Safety instructions.............................................................................................................................8
1.3 Documentation Issue Status .............................................................................................................9
1.4 Guide through documentation.........................................................................................................10
1.5 Version identification of EtherCAT devices .....................................................................................11
1.5.1 General notes on marking................................................................................................11
1.5.2 Version identification of EL terminals ............................................................................... 11
1.5.3 Beckhoff Identification Code (BIC) ................................................................................... 12
1.5.4 Electronic access to the BIC (eBIC).................................................................................13
1.5.5 BIC within CoE of EL3751................................................................................................ 16
2 Product overview ....................................................................................................................................17
2.1 Description ......................................................................................................................................17
2.2 Technical data.................................................................................................................................18
2.2.1 Common technical data ................................................................................................... 18
2.2.2 Process data interpretation .............................................................................................. 20
2.2.3 General Information on Measuring Accuracy/Measurement Uncertainty......................... 22
2.2.4 Measurement ±30 V.........................................................................................................26
2.2.5 Measurement ±10 V.........................................................................................................28
2.2.6 Measurement ±5 V...........................................................................................................30
2.2.7 Measurement ±2.5 V........................................................................................................32
2.2.8 Measurement ±1.25 V......................................................................................................34
2.2.9 Measurement ±640 mV....................................................................................................36
2.2.10 Measurement ±320 mV....................................................................................................38
2.2.11 Measurement ±160 mV....................................................................................................40
2.2.12 Measurement ±80 mV......................................................................................................42
2.2.13 Measurement ±40 mV......................................................................................................44
2.2.14 Measurement ±20 mV......................................................................................................46
2.2.15 Measurement ±10 mV......................................................................................................48
2.2.16 Measurement ±5 mV........................................................................................................50
2.2.17 Measurement 0…5 V .......................................................................................................52
2.2.18 Measurement 0…10 V .....................................................................................................54
2.2.19 Measurement ±20 mA......................................................................................................56
2.2.20 Measurement 0…20 mA ..................................................................................................58
2.2.21 Measurement 4…20 mA ..................................................................................................60
2.2.22 Measurement 3.6…21 mA (NAMUR NE43).....................................................................63
2.2.23 Measurement resistance 0…5 kΩ....................................................................................65
2.2.24 RTD measurement...........................................................................................................69
2.2.25 Potentiometer measurement............................................................................................72
2.2.26 Measurement SG 1/1 bridge (full bridge) 4/6-wire connection.........................................74
2.2.27 Measurement SG 1/2 bridge (half bridge) 3/5-wire connection........................................79
2.2.28 Measurement SG 1/4 bridge (quarter bridge) 120Ω 2/3-wire connection ....................... 85
2.2.29 Measurement SG 1/4 bridge (quarter bridge) 350Ω 2/3-wire connection ....................... 89
3 Commissioning .......................................................................................................................................93

Table of contents
EL37514 Version: 3.9
3.1 Notes to short documentation .........................................................................................................93
3.2 CoE overview ..................................................................................................................................94
3.2.1 0x6000 PAI Status Ch.1...................................................................................................94
3.2.2 0x6001 PAI Samples Ch.1 ............................................................................................... 94
3.2.3 0x6002 PAI Synchronous Oversampling Ch.1.................................................................94
3.2.4 0x7000 PAI Control Ch.1 ................................................................................................. 94
3.2.5 0x8000 PAI Settings Ch.1 ................................................................................................ 95
3.2.6 0x8001 PAI Filter 1 Settings Ch.1 .................................................................................... 97
3.2.7 0x8003 PAI Filter 2 Settings Ch.1 .................................................................................... 97
3.2.8 0x8005 Scaler Settings Ch.1............................................................................................ 97
3.2.9 0x800E PAI User Calibration Data Ch.1 .......................................................................... 98
3.2.10 0x800F PAI Vendor Calibration Data Ch.1 ......................................................................98
3.2.11 0x9000 PAI Internal Data Ch.1 ........................................................................................99
3.2.12 0x900F PAI Calibration Dates Ch.1 ...............................................................................101
3.2.13 0xF000 Modular device profile.......................................................................................103
3.2.14 0xF008 Code word.........................................................................................................103
3.2.15 0xF009 Password Protection .........................................................................................103
3.2.16 0xF010 Module list.........................................................................................................103
3.2.17 0xF600 PAI Timestamp..................................................................................................103
3.2.18 0xF900 PAI Info Data.....................................................................................................104
3.2.19 0xF912 filter info.............................................................................................................104
3.2.20 0xFB00 PAI Command ..................................................................................................104
3.3 Sample programs..........................................................................................................................105
3.3.1 Sample program 1 and 2 (offset/gain)............................................................................ 107
3.3.2 Sample program 3 (write LookUp table) ........................................................................ 113
3.3.3 Sample program 4 (generate LookUp table)..................................................................114
3.3.4 Sample program5(write filter coefficients)....................................................................116
3.3.5 Sample program 6 (interlacing of measured values) ..................................................... 118
3.3.6 Sample program 7 (general decimation in the PLC) ...................................................... 123
3.3.7 Sample program 8 (FB for real time diagnosis) ............................................................. 128
3.3.8 Sample program 9 (R/W signature of calibration) .......................................................... 131
4 EL3751 Features....................................................................................................................................133
5 Commissioning on EtherCAT Master..................................................................................................134
5.1 General Commissioning Instructions for an EtherCAT Slave .......................................................134
5.2 TwinCAT Quick Start.....................................................................................................................142
5.2.1 TwinCAT 2 .....................................................................................................................144
5.2.2 TwinCAT 3 .....................................................................................................................154
5.3 TwinCAT Development Environment ............................................................................................167
5.3.1 Installation of the TwinCAT real-time driver ................................................................... 168
5.3.2 Notes regarding ESI device description ......................................................................... 174
5.3.3 TwinCAT ESI Updater....................................................................................................178
5.3.4 Distinction between Online and Offline .......................................................................... 178
5.3.5 OFFLINE configuration creation..................................................................................... 179
5.3.6 ONLINE configuration creation ...................................................................................... 184
5.3.7 EtherCAT subscriber configuration ................................................................................ 192

Table of contents
EL3751 5Version: 3.9
5.3.8 Import/Export of EtherCAT devices with SCI and XTI.................................................... 201
5.4 EtherCAT basics ...........................................................................................................................207
5.5 EtherCAT cabling – wire-bound ....................................................................................................207
5.6 General notes for setting the watchdog ........................................................................................208
5.7 EtherCAT State Machine ..............................................................................................................210
5.8 CoE Interface ................................................................................................................................212
5.9 Distributed Clock ...........................................................................................................................217
6 Mounting and wiring .............................................................................................................................218
6.1 Installation positions......................................................................................................................218
6.2 Positioning of passive Terminals...................................................................................................219
6.3 ATEX - Special conditions (standard temperature range).............................................................221
6.4 Notes regarding connectors and wiring.........................................................................................222
6.5 Shielding concept..........................................................................................................................223
6.6 Installation on mounting rails.........................................................................................................225
6.7 Connection ....................................................................................................................................228
6.7.1 Connection system......................................................................................................... 228
6.7.2 Wiring .............................................................................................................................231
6.7.3 Shielding ........................................................................................................................232
6.8 Note - Power supply......................................................................................................................232
6.9 LED indicators - meanings ............................................................................................................232
6.10 Connection ....................................................................................................................................233
6.11 Disposal ........................................................................................................................................234
7 Appendix................................................................................................................................................235
7.1 Diagnostics - basic principles of diag messages...........................................................................235
7.2 TcEventLogger and IO ..................................................................................................................242
7.3 UL notice .......................................................................................................................................246
7.4 Continuative documentation for ATEX and IECEx........................................................................248
7.5 EtherCAT AL Status Codes ..........................................................................................................248
7.6 Firmware Update EL/ES/EM/ELM/EPxxxx....................................................................................248
7.6.1 Device description ESI file/XML ..................................................................................... 249
7.6.2 Firmware explanation.....................................................................................................252
7.6.3 Updating controller firmware *.efw ................................................................................. 253
7.6.4 FPGA firmware *.rbf ....................................................................................................... 255
7.6.5 Simultaneous updating of several EtherCAT devices .................................................... 259
7.7 Firmware compatibility ..................................................................................................................260
7.8 Firmware compatibility - passive terminals ...................................................................................260
7.9 Restoring the delivery state...........................................................................................................260
7.10 Notes on analog aspects to EL3751/ ELM3xxx ............................................................................261
7.11 Continuative documentation for I/O components with analog in and outputs ...............................262
7.12 Support and Service......................................................................................................................263
7.13 Reshipment and return..................................................................................................................263

Table of contents
EL37516 Version: 3.9

Foreword
EL3751 7Version: 3.9
1 Foreword
NOTICE
Within this short documentation some chapters are only available in a shortened version. For the complete
documentation please contact the Beckhoff sales department responsible for you.
1.1 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®, TwinCAT/BSD®, TC/BSD®, 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.
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
EL37518 Version: 3.9
1.2 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.
NOTICE
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
EL3751 9Version: 3.9
1.3 Documentation Issue Status
Version Comment
3.9 • “Guide through documentation“ within foreword added
• Chapter “Product overview” and subchapter “Mounting and wiring”/ “LED indicators – mean-
ings” updated
• Subchapter “Commissioning”/ “CoE overview” updated

Foreword
EL375110 Version: 3.9
1.4 Guide through documentation
NOTICE
Further components of documentation
This documentation describes device-specific content. It is part of the modular
documentation concept for Beckhoff I/O components. For the use and safe operation of the
device / devices described in this documentation, additional cross-product descriptions are
required, which can be found in the following table.
Title Description
EtherCAT System Documentation (PDF)• System overview
• EtherCAT basics
• Cable redundancy
• Hot Connect
• EtherCAT devices configuration
I/O Analog Manual (PDF)Notes on I/O components with analog in and outputs
Explosion Protection for Terminal
Systems(PDF)
Notes on the use of the Beckhoff terminal systems in
hazardous areas according to ATEX and IECEx
Infrastructure for EtherCAT/Ethernet (PDF)Technical recommendations and notes for design,
implementation and testing
Software Declarations I/O (PDF)Open source software declarations for
Beckhoff I/O components
The documentations can be viewed at and downloaded from the Beckhoff website (www.beckhoff.com) via:
• the “Documentation and Download” area of the respective product page,
• the Download finder,
• the Beckhoff Information System.