Omron PROFINET NX-PNC202 User manual

Machine Automation Controller
NX-series
PROFINET Coupler Unit
NX-series
PROFINET
Coupler Unit
User’s Manual
W623-E2-01
NX-PNC202

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in
any form, or by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior
written permission of OMRON.
No patent liability is assumed with respect to the use of the information contained herein. Moreover, because
OMRON is constantly striving to improve its high-quality products, the information contained in this manual is
subject to change without notice. Every precaution has been taken in the preparation of this manual. Neverthe-
less, OMRON assumes no responsibility for errors or omissions. Neither is any liability assumed for damages
resulting from the use of the information contained in this publication.
• Sysmac and SYSMAC are trademarks or registered trademarks of OMRON Corporation in Japan and other
countries for OMRON factory automation products.
• Microsoft, Windows, and Windows Vista are either registered trademarks or trademarks of Microsoft Corporation
in the United States and other countries.
• EtherCAT® is registered trademark and patented technology, licensed by Beckhoff Automation GmbH, Germany.
• ODVA, CIP, CompoNet, DeviceNet, and EtherNet/IP are trademarks of ODVA.
• The SD and SDHC logos are trademarks of SD-3C, LLC.
Other company names and product names in this document are the trademarks or registered trademarks of their
respective companies.
Trademarks
Copyrights
NOTE
Microsoft product screen shots used with permission from Microsoft.

1
Introduction
NX-series PROFINET Coupler Unit User’s Manual (W623)
Introduction
Thank you for purchasing an NX-series PROFINET Coupler Unit.
This manual contains information that is necessary to use the NX-series PROFINET Coupler Unit. Please read
this manual and make sure you understand the functionality and performance of the NX-series PROFINET
Coupler Unit before you attempt to use it in a control system.
Keep this manual in a safe place where it will be available for reference during operation.
This manual is intended for the following personnel, who must also have knowledge of electrical systems (an
electrical engineer or the equivalent).
• Personnel in charge of introducing FA systems.
• Personnel in charge of designing FA systems.
• Personnel in charge of installing and maintaining FA systems.
• Personnel in charge of managing FA systems and facilities.
For programming, this manual is intended for personnel who understand the programming language specifi-
cations in international standard IEC 61131-3 or Japanese standard JIS B 3503.
This manual covers the following product.
• NX-series PROFINET Coupler Unit
NX-PNC202
Intended Audience
Applicable Products

2NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS
CONTENTS
Introduction ..............................................................................................................1
Intended Audience ....................................................................................................................................... 1
Applicable Products ..................................................................................................................................... 1
CONTENTS................................................................................................................2
Manual Structure ...................................................................................................... 8
Page Structure and Icons ............................................................................................................................ 8
Special Information ...................................................................................................................................... 9
Precaution on Terminology .......................................................................................................................... 9
Terms and Conditions Agreement ........................................................................ 11
Warranty, Limitations of Liability ................................................................................................................ 11
Application Considerations ........................................................................................................................ 12
Disclaimers ................................................................................................................................................ 12
Safety Precautions .................................................................................................13
Definition of Precautionary Information...................................................................................................... 13
Symbols ..................................................................................................................................................... 13
Warnings.................................................................................................................................................... 14
Cautions..................................................................................................................................................... 15
Precautions for Safe Use.......................................................................................16
Precautions for Correct Use.................................................................................. 21
Regulations and Standards...................................................................................22
Conformance to EU Directives .................................................................................................................. 22
Conformance to UL and CSA Standards ................................................................................................... 23
Conformance to KC Certification ............................................................................................................... 23
Software Licenses and Copyrights ............................................................................................................ 23
Unit Versions ..........................................................................................................24
Unit Versions.............................................................................................................................................. 24
Unit Versions and Sysmac Studio Versions............................................................................................... 26
Related Manuals ..................................................................................................... 27
Terminology ............................................................................................................28
Revision History .....................................................................................................29
Sections in this Manual .........................................................................................31
Section 1 PROFINET IO Technology
1-1 Introduction to PROFINET .................................................................................................... 1-2
1-2 PROFINET Distributed IO...................................................................................................... 1-3
1-3 PROFINET communication Services ................................................................................... 1-6
Section 2 Features and System Configuration
2-1 Features of the PROFINET Coupler Unit ............................................................................. 2-2

3
NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS
2-2 System Configurations of PROFINET Coupler Unit ........................................................... 2-4
2-2-1 System Configuration ................................................................................................................. 2-4
2-2-2 Types of NX Units....................................................................................................................... 2-6
2-3 Sysmac Studio....................................................................................................................... 2-9
2-3-1 Connection Method and Procedures .......................................................................................... 2-9
Section 3 Specifications and Application Procedures
3-1 Specifications ........................................................................................................................ 3-2
3-1-1 General Specifications of PROFINET IO Device Terminals ....................................................... 3-2
3-1-2 PROFINET Specifications .......................................................................................................... 3-3
3-1-3 PROFINET Coupler Unit Specifications ..................................................................................... 3-4
3-1-4 End Cover Specifications............................................................................................................ 3-6
3-2 Procedures............................................................................................................................. 3-7
3-2-1 PROFINET IO Device Terminal Application Procedures ............................................................ 3-7
3-2-2 Details......................................................................................................................................... 3-9
Section 4 Part Names and Functions
4-1 Parts and Names ................................................................................................................... 4-2
4-1-1 PROFINET Coupler Unit............................................................................................................. 4-2
4-1-2 NX Units...................................................................................................................................... 4-3
4-1-3 End Cover................................................................................................................................... 4-4
4-2 Indicators ............................................................................................................................... 4-5
4-3 Hardware Switch Settings .................................................................................................... 4-8
4-4 Communications Connector and Peripheral USB Port...................................................... 4-9
4-5 Terminal Blocks ................................................................................................................... 4-10
4-6 DIN Track Contact Plate ...................................................................................................... 4-12
Section 5 Designing the Power Supply System
5-1 Power Supply System and Design Concepts ..................................................................... 5-2
5-1-1 Power Supply System and Types of Power Supplies ................................................................. 5-2
5-1-2 NX-series Power Supply-related Units ....................................................................................... 5-3
5-1-3 Design Concepts for Power Supply to the PROFINET IO Device Terminal ............................... 5-5
5-2 Designing the NX Unit Power Supply System .................................................................... 5-6
5-2-1 Procedure for Designing the NX Unit Power Supply System ..................................................... 5-6
5-2-2 Calculation Example for the NX Unit Power Supply ................................................................... 5-7
5-3 Designing the IO Power Supply System ............................................................................. 5-9
5-3-1 IO Power Supply Method............................................................................................................ 5-9
5-3-2 Designing the IO Power Supply from the NX Bus .................................................................... 5-10
5-3-3 Designing the IO Power Supply from External Sources ........................................................... 5-14
5-3-4 Restrictions on Inrush Current for ON/OFF Operation ............................................................. 5-14
5-4 Selecting External Power Supplies and Protective Devices ........................................... 5-16
5-4-1 Selecting the Unit Power Supply .............................................................................................. 5-16
5-4-2 Selecting the IO Power Supplies .............................................................................................. 5-18
5-4-3 Selecting Protective Devices .................................................................................................... 5-18
Section 6 Installation
6-1 Installing Units....................................................................................................................... 6-2
6-1-1 Installation Precautions............................................................................................................... 6-2
6-1-2 Preparations for Installation ........................................................................................................ 6-6

4NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS
6-1-3 Installation Orientation ................................................................................................................ 6-8
6-1-4 Installing the PROFINET Coupler Unit........................................................................................ 6-9
6-1-5 Installing and Connecting NX Units........................................................................................... 6-12
6-1-6 Mounting the End Cover ........................................................................................................... 6-15
6-1-7 Mounting the End Plates........................................................................................................... 6-16
6-1-8 Attaching Markers ..................................................................................................................... 6-17
6-1-9 Removing Units......................................................................................................................... 6-18
6-1-10 Assembled Appearance and Dimensions ................................................................................. 6-20
6-2 Control Panel Installation ................................................................................................... 6-23
6-2-1 Temperature .............................................................................................................................. 6-23
6-2-2 Humidity .................................................................................................................................... 6-25
6-2-3 Vibration and Shock .................................................................................................................. 6-25
6-2-4 Atmosphere............................................................................................................................... 6-25
6-2-5 Electrical Environment .............................................................................................................. 6-25
6-2-6 Grounding ................................................................................................................................. 6-30
Section 7 Wiring
7-1 PROFINET Network Wiring ................................................................................................... 7-2
7-1-1 Installation Precautions............................................................................................................... 7-2
7-1-2 Preparations for Installation ........................................................................................................ 7-2
7-1-3 Pin Arrangement of Communications Connectors on the PROFINET Coupler Unit ................... 7-3
7-1-4 Connecting Communications Cables and Connectors................................................................ 7-4
7-1-5 Connecting Communications Cables..........................................................................................7-4
7-2 Connecting the Power Supply and Ground Wires.............................................................. 7-6
7-2-1 Wiring the PROFINET Coupler Unit............................................................................................ 7-6
7-2-2 Wiring the Power Supply to the PROFINET IO Device Terminal ................................................ 7-7
7-2-3 Grounding the PROFINET IO Device Terminal........................................................................... 7-7
7-2-4 Precautions for Wiring the PROFINET IO Device Terminal Together with Computers
and other Peripheral Devices.................................................................................................... 7-11
7-2-5 Wiring to the Screwless Clamping Terminal Block .................................................................... 7-11
7-3 Connecting USB Cable ....................................................................................................... 7-26
7-4 Wiring External Signal Lines .............................................................................................. 7-28
Section 8 PROFINET Communications
8-1 Communication protocols .................................................................................................... 8-2
8-1-1 RT and IRT ................................................................................................................................. 8-2
Section 9 Setting Up the PROFINET Coupler Unit
9-1 Settings and Setting Procedures ......................................................................................... 9-2
9-1-1 Items to Set................................................................................................................................. 9-2
9-1-2 IO Device Terminal Parameters .................................................................................................. 9-4
9-1-3 Setting Procedures...................................................................................................................... 9-4
9-2 Setting IO Device Terminal Parameters............................................................................... 9-5
9-2-1 Items to Set................................................................................................................................. 9-5
9-2-2 Setting the NX Unit Configuration Information ............................................................................ 9-5
9-2-3 Unit Operation Settings............................................................................................................. 9-10
9-2-4 Unit Application Data................................................................................................................. 9-11
9-2-5 Sysmac Studio Functions Used as Required............................................................................9-12
9-3 Transferring and Comparing Settings ............................................................................... 9-16
9-3-1 Transferring IO Device Terminal Setting Information through the USB Port
on the PROFINET Coupler Unit ............................................................................................... 9-16
9-3-2 Comparing Settings...................................................................................................................9-18
9-4 Setting PROFINET IO Device Name ................................................................................... 9-19

5
NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS
9-5 Setting PROFINET IO Data.................................................................................................. 9-20
9-5-1 IO Allocation.............................................................................................................................. 9-20
9-5-2 Parameter Settings of the PROFINET Coupler Unit................................................................. 9-26
9-6 NX Unit IO Allocation........................................................................................................... 9-27
9-6-1 Basic IO Mapping ..................................................................................................................... 9-27
9-6-2 Sysmac Studio IO Allocation Functions .................................................................................... 9-29
9-6-3 Endian ...................................................................................................................................... 9-30
Section 10 I/O Refreshing
10-1 Introduction to I/O Refreshing for PROFINET IO Devices ............................................... 10-2
10-2 Communications Performance .......................................................................................... 10-3
10-2-1 I/O Response Time................................................................................................................... 10-3
Section 11 PROFINET Coupler Unit Functions
11-1 Functions ............................................................................................................................. 11-3
11-2 NX Unit Mounting Settings ................................................................................................. 11-4
11-2-1 Introduction................................................................................................................................11-4
11-2-2 Applications ...............................................................................................................................11-5
11-2-3 Operating Specifications for NX Units That Are Set as Unmounted Units.................................11-5
11-2-4 Setting NX Units as Unmounted Units.......................................................................................11-6
11-3 Event Logs ........................................................................................................................... 11-8
11-3-1 Introduction................................................................................................................................11-8
11-3-2 Detailed Information on Event Logs...........................................................................................11-9
11-3-3 Reading Event Logs ................................................................................................................11-11
11-3-4 Clearing Event Logs ................................................................................................................11-13
11-3-5 Exporting the Event Log ..........................................................................................................11-15
11-4 Clearing All Memory .......................................................................................................... 11-16
11-4-1 Introduction..............................................................................................................................11-16
11-4-2 Details on Clearing All Memory................................................................................................11-16
11-4-3 Procedure for Clearing All Memory..........................................................................................11-18
11-5 Restarting........................................................................................................................... 11-22
11-5-1 Introduction..............................................................................................................................11-22
11-5-2 Details on Restarting ...............................................................................................................11-22
11-5-3 Procedure for Restarting..........................................................................................................11-23
11-6 Changing Event Levels ..................................................................................................... 11-24
11-6-1 Introduction..............................................................................................................................11-24
11-6-2 Details on Changing Event Levels...........................................................................................11-24
11-6-3 Procedure to Change an Event Level......................................................................................11-25
11-7 Fail-soft Operation............................................................................................................. 11-27
11-7-1 Overview..................................................................................................................................11-27
11-7-2 Application ...............................................................................................................................11-28
11-7-3 Details on Fail-soft Operation ..................................................................................................11-28
11-8 Monitoring Total Power-ON Time..................................................................................... 11-30
11-8-1 Overview..................................................................................................................................11-30
11-8-2 Details on Monitoring Total Power-ON Times ..........................................................................11-30
11-8-3 Checking Total Power-ON Times.............................................................................................11-30
11-9 Ethernet Switch Functions ............................................................................................... 11-31
Section 12 Troubleshooting
12-1 How to Check for Errors ..................................................................................................... 12-2
12-2 Checking for Errors and Troubleshooting with the Indicators ....................................... 12-3

6NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS
12-2-1 Checking for Errors and Troubleshooting with the Indicators
on the PROFINET Coupler Unit................................................................................................ 12-3
12-2-2 Checking for Errors and Troubleshooting with the Indicators on the NX Units ......................... 12-8
12-3 Checking for Errors and Troubleshooting with Sysmac Studio ..................................... 12-9
12-3-1 Checking Status with the PROFINET Network ......................................................................... 12-9
12-3-2 Checking for Errors from the Sysmac Studio.......................................................................... 12-10
12-3-3 Checking for Errors from Support Software Other Than the Sysmac Studio .......................... 12-10
12-3-4 Event Codes for Errors and Troubleshooting Procedures....................................................... 12-11
12-4 Resetting Errors ................................................................................................................ 12-32
12-4-1 Procedure to Reset Errors ...................................................................................................... 12-32
12-5 Troubleshooting Other Errors .......................................................................................... 12-35
Section 13 Maintenance and Inspection
13-1 Cleaning and Maintenance ................................................................................................. 13-2
13-1-1 Cleaning .................................................................................................................................... 13-2
13-1-2 Periodic Inspections.................................................................................................................. 13-2
13-2 Maintenance Procedures .................................................................................................... 13-4
13-2-1 Importing and Exporting Data ................................................................................................... 13-4
13-2-2 Replacement Procedure for the PROFINET Coupler Unit ........................................................ 13-5
13-2-3 Basic Replacement Procedure for NX Units ............................................................................. 13-6
13-2-4 Using Settings from NX Units on Other Coupler Units.............................................................. 13-7
Appendices
A-1 Dimensions ............................................................................................................................A-2
A-1-1 PROFINET Coupler Unit .............................................................................................................A-2
A-1-2 End Cover ...................................................................................................................................A-3
A-2 Terminal Block Model Numbers ...........................................................................................A-4
A-2-1 Model Number Notation ..............................................................................................................A-4
A-2-2 Models.........................................................................................................................................A-5
Index

7
NX-series PROFINET Coupler Unit User’s Manual (W623)
CONTENTS

Manual Structure
8NX-series PROFINET Coupler Unit User’s Manual (W623)
Manual Structure
The following page structure and icons are used in this manual.
Note This illustration is provided only as a sample. It may not literally appear in this manual.
Page Structure and Icons
4-9
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
stinUgnitnuoM3-4
4
stnenopmoCrellortnoCgnitcennoC1-3-4
4-3 Mounting Units
The Units that make up an NJ-series Controller can be connected simply by pressing the Units together
and locking the sliders by moving them toward the back of the Units. The End Cover is connected in the
same way to the Unit on the far right side of the Controller.
1Join the Units so that the connectors fit exactly.
2The yellow sliders at the top and bottom of each Unit lock the Units together. Move the sliders
toward the back of the Units as shown below until they click into place.
4-3-1 Connecting Controller Components
Connector
Hook Hook holes
Slider
Lock
Release
Move the sliders toward the back
until they lock into place.
Level 1 heading
Level 2 heading
Level 3 heading
Level 2 heading
A step in a procedure
Manual name
Special information
Level 3 heading
Page tab
Gives the current
headings.
Indicates a procedure.
Icons indicate
precautions, additional
information, or reference
information.
Gives the number
of the main section.
The sliders on the tops and bottoms of the Power Supply Unit, CPU Unit, I/O Units, Special I/O
Units, and CPU Bus Units must be completely locked (until they click into place) after connecting
the adjacent Unit connectors.
Precautions for Correct Use

9
Manual Structure
NX-series PROFINET Coupler Unit User’s Manual (W623)
Special information in this manual is classified as follows:
Precautions for Safe Use
Precautions on what to do and what not to do to ensure safe usage of the product.
Precautions for Correct Use
Precautions on what to do and what not to do to ensure proper operation and performance.
Additional Information
Additional information to read as required.
This information is provided to increase understanding or make operation easier.
Version Information
Information on differences in specifications and functionality for CPU Units, Industrial PCs, and
Communications Coupler Units with different unit versions and for different versions of the Sys-
mac Studio is given.
Note References are provided to more detailed or related information.
• In this manual, “download” refers to transferring data from the Sysmac Studio to a physical device
and “upload” refers to transferring data from a physical device to the Sysmac Studio.
• In this manual, the directions in relation to the Units are given in the following figure, which shows
upright installation.
Special Information
Precaution on Terminology
RightLeft
Up
Down

Manual Structure
10 NX-series PROFINET Coupler Unit User’s Manual (W623)

11
Terms and Conditions Agreement
NX-series PROFINET Coupler Unit User’s Manual (W623)
Terms and Conditions Agreement
Exclusive Warranty
Omron’s exclusive warranty is that the Products will be free from defects in materials and workman-
ship for a period of twelve months from the date of sale by Omron (or such other period expressed in
writing by Omron). Omron disclaims all other warranties, express or implied.
Limitations
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF
THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based
on infringement by the Products or otherwise of any intellectual property right.
Buyer Remedy
Omron’s sole obligation hereunder shall be, at Omron’s election, to (i) replace (in the form originally
shipped with Buyer responsible for labor charges for removal or replacement thereof) the non-com-
plying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal
to the purchase price of the non-complying Product; provided that in no event shall Omron be
responsible for warranty, repair, indemnity or any other claims or expenses regarding the Products
unless Omron’s analysis confirms that the Products were properly handled, stored, installed and
maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of
any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies
shall not be liable for the suitability or unsuitability or the results from the use of Products in combi-
nation with any electrical or electronic components, circuits, system assemblies or any other materi-
als or substances or environments. Any advice, recommendations or information given orally or in
writing, are not to be construed as an amendment or addition to the above warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CON-
SEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY
WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT,
WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on
which liability is asserted.
Warranty, Limitations of Liability
Warranties
Limitation on Liability; Etc

Terms and Conditions Agreement
12 NX-series PROFINET Coupler Unit User’s Manual (W623)
Omron Companies shall not be responsible for conformity with any standards, codes or regulations
which apply to the combination of the Product in the Buyer’s application or use of the Product. At
Buyer’s request, Omron will provide applicable third party certification documents identifying ratings
and limitations of use which apply to the Product. This information by itself is not sufficient for a com-
plete determination of the suitability of the Product in combination with the end product, machine, sys-
tem, or other application or use. Buyer shall be solely responsible for determining appropriateness of
the particular Product with respect to Buyer’s application, product or system. Buyer shall take applica-
tion responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE
HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS
PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIP-
MENT OR SYSTEM.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or
any consequence thereof.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for
the user in determining suitability and does not constitute a warranty. It may represent the result of
Omron’s test conditions, and the user must correlate it to actual application requirements. Actual perfor-
mance is subject to the Omron’s Warranty and Limitations of Liability.
Product specifications and accessories may be changed at any time based on improvements and other
reasons. It is our practice to change part numbers when published ratings or features are changed, or
when significant construction changes are made. However, some specifications of the Product may be
changed without any notice. When in doubt, special part numbers may be assigned to fix or establish
key specifications for your application. Please consult with your Omron’s representative at any time to
confirm actual specifications of purchased Product.
Information presented by Omron Companies has been checked and is believed to be accurate; how-
ever, no responsibility is assumed for clerical, typographical or proofreading errors or omissions.
Application Considerations
Suitability of Use
Programmable Products
Disclaimers
Performance Data
Change in Specifications
Errors and Omissions

13
Safety Precautions
NX-series PROFINET Coupler Unit User’s Manual (W623)
Safety Precautions
The following notation is used in this manual to provide precautions required to ensure safe usage of an
NX-series PROFINET Coupler Unit.
The safety precautions that are provided are extremely important to safety. Always read and heed the
information provided in all safety precautions.
The following notation is used.
Definition of Precautionary Information
Symbols
The circle and slash symbol indicates operations that you must not do.
The specific operation is shown in the circle and explained in text.
This example indicates prohibiting disassembly.
The triangle symbol indicates precautions (including warnings).
The specific operation is shown in the triangle and explained in text.
This example indicates a precaution for electric shock.
The triangle symbol indicates precautions (including warnings).
The specific operation is shown in the triangle and explained in text.
This example indicates a general precaution.
The filled circle symbol indicates operations that you must do.
The specific operation is shown in the circle and explained in text.
This example shows a general precaution for something that you must do.
WARNING
Caution
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury. Additionally, there may be
severe property damage.
Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury, or property damage.

Safety Precautions
14 NX-series PROFINET Coupler Unit User’s Manual (W623)
Warnings
During Power Supply
Do not touch the terminal section while power is ON.
Electric shock may occur.
Do not attempt to take any Unit apart.
In particular, high-voltage parts are present in Units that supply power while power is sup-
plied or immediately after power is turned OFF. Touching any of these parts may result in
electric shock. There are sharp parts inside the Unit that may cause injury.
Fail-safe Measures
Provide safety measures in external circuits to ensure safety in the system if an abnormality
occurs due to malfunction of the CPU Unit, Industrial PCs, other Units, or PROFINET IO
Device or due to other external factors affecting operation.
Not doing so may result in serious accidents due to incorrect operation.
Emergency stop circuits, interlock circuits, limit circuits, and similar safety measures must
be provided in external control circuits.
The CPU Unit or Industrial PCs will turn OFF all outputs from Output Units in the following
cases. The remote IO Devices will operate according to the settings in the IO Devices.
• If a power supply error occurs.
• If the power supply connection becomes faulty.
• If a CPU watchdog timer error or CPU reset occurs.
• If a Controller error in the major fault level occurs.
• While the CPU Unit is on standby until RUN mode is entered after the power is turned ON
External safety measures must be provided to ensure safe operation of the system in such
cases.
The outputs may remain ON or OFF due to deposition or burning of the output relays or
destruction of the output transistors. As a countermeasure for such problems, external
safety measures must be provided to ensure safe operation of the system.
If external power supplies for IO Devices or other devices are overloaded or short-circuited,
the voltage will drop, outputs will turn OFF, and the system may be unable to read inputs.
Provide external safety measures in control with monitoring of external power supply volt-
age as required so that the system operates safely in such a case.
You must take fail-safe measures to ensure safety in the event of incorrect, missing, or
abnormal signals caused by broken signal lines, momentary power interruptions, or other
causes.
Not doing so may result in serious accidents due to incorrect operation.
WARNING

15
Safety Precautions
NX-series PROFINET Coupler Unit User’s Manual (W623)
Voltage and Current Inputs
Make sure that the voltages and currents that are input to the Units and IO Devices are
within the specified ranges.
Inputting voltages or currents that are outside of the specified ranges may cause accidents
or fire.
Transferring
Always confirm safety at the destination node before you transfer Unit configuration infor-
mation, parameters, settings, or other data from tools such as the Sysmac Studio.
The devices or machines may operate unexpectedly, regardless of the operating mode of
the Controller.
Cautions
Wiring
When you connect a computer or other peripheral device to a Communications Coupler
Unit that has a non-isolated DC power supply, either ground the 0-V side of the external
power supply (i.e. Unit power supply) or do not ground it at all.
If the peripheral devices are grounded incorrectly, the external power supply (i.e. Unit
power supply) may be short-circuited.
Never ground the 24-V side of the power supply, as shown in the following figure.
Be sure that all terminal screws and cable connector screws are tightened to the torque
specified in the relevant manuals. The loose screws may result in fire or malfunction.
Caution
Peripheral device
(e.g., computer)
Non-isolated DC power
supply (internal power
supply circuit)
24 V 0 V
Peripheral device
cable
Ground terminal
Communications Coupler Unit
NX Unit power
supply
Unit power
supply

Precautions for Safe Use
16 NX-series PROFINET Coupler Unit User’s Manual (W623)
Precautions for Safe Use
• When transporting any Unit, use the special packing box for it.
Also, do not subject the Unit to excessive vibration or shock during transportation.
• Do not drop any Unit or subject it to abnormal vibration or shock.
Doing so may result in Unit malfunction or burning.
• Mount terminal blocks and connectors only after checking the mounting location carefully.
• Be sure that the terminal blocks, expansion cables, and other items with locking devices are properly
locked into place.
• Always turn OFF the power supply before installing the Unit. If the power supply is not OFF, the Unit
may malfunction or may be damaged.
• Always turn OFF the Unit power supply and IO power supply before you remove the NX Unit.
• Do not apply labels or tape to the Unit. When the Unit is installed or removed, adhesive or scraps may
adhere to the pins in the NX bus connector, which may result in malfunctions.
• Do not touch the pins in the NX bus connector on the Unit. Dirt may adhere to the pins in the NX bus
connector, which may result in malfunctions.
Transporting
Mounting
Installation
Example: NX Unit (12 mm width)
NG NG

17
Precautions for Safe Use
NX-series PROFINET Coupler Unit User’s Manual (W623)
• Do not write on the Communications Coupler Unit or an NX Unit with ink within the restricted region
that is shown in the following figure. Also do not get this area dirty. When the Unit is installed or
removed, ink or dirt may adhere to the pins in the NX bus connector, which may result in malfunc-
tions in the IO Device Terminal.
• For the installation orientations in the following figure, support the cables, e.g., with a duct, so that
the End Plate on the bottom is not subjected to the weight of the cables. The weight of the cables
may cause the bottom End Plate to slide downward so that the IO Device Terminal is no longer
secured to the DIN Track, which may result in malfunctions.
• Double-check all switches and other settings and double-check all wiring to make sure that they are
correct before turning ON the power supply.
Use the correct wiring parts and tools when you wire the system.
• Do not pull on the cables or bend the cables beyond their natural limit. Also, do not place heavy
objects on top of the cables or other wiring lines. Doing so may break the cable.
• When wiring or installing the Units, do not allow metal fragments to enter the Units.
• Do not press the flat-blade screwdriver straight into the release holes on a screwless clamping termi-
nal block. Doing so may damage the terminal block.
• When you insert a flat-blade screwdriver into a release hole on a screwless clamping terminal block,
press it down with a force of 30N or less. Applying excessive force may damage the terminal block.
Wiring
Restricted
region (shaded
portion)
Communications Coupler
Unit or NX Unit
NX Unit
Up
Down
NG OK

Precautions for Safe Use
18 NX-series PROFINET Coupler Unit User’s Manual (W623)
• Do not incline or twist the flat-blade screwdriver while it is in a release hole on a screwless clamping
terminal block. Doing so may damage the terminal block.
• Use all Units within the IO power supply ranges that are given in the specifications.
• Supply sufficient power according to the contents of this manual.
• Use the power supply voltage that is specified in this manual.
• Do not apply voltages that exceed the rated value to any Input Unit.
• Do not apply voltages or connect loads to the Output Units or IO Devices in excess of the maximum
ratings.
• Inrush current occurs when the power supply is turned ON. When selecting fuses or breakers for
external circuits, consider their fusing and detection characteristics as well as the above precautions
and allow sufficient margin in shut-off performance.
• Install external breakers and take other safety measures against short-circuiting and overcurrents in
external wiring.
• When you set the Operating Mode at Startup, confirm that no adverse effect will occur in the system.
• Before you start operation, always register the NX Units that are connected to the Communications
Coupler Unit in the host communications IO Controller as the Unit configuration information.
• Check the user program, data, and parameter settings for proper execution before you use them for
actual operation.
• If you change the fail-soft operation setting, the output status when the error occurs may also
change. Confirm safety before you change the fail-soft operation setting.
• If you use fail-soft operation, write programming to determine whether Unit IO data is valid. Without
such programming, the user program cannot distinguish between Units for which IO refreshing is
continued and Units for which IO refreshing is stopped.
• Do not disconnect the cable or turn OFF the power supply to the Controller or an IO Device Terminal
when downloading data or the user program from the Sysmac Studio.
• Always turn OFF the external power supply to the Units before attempting any of the following.
Mounting or removing an NX Unit, Communications Coupler Unit, CPU Unit, or Industrial PC
Assembling Units
Setting DIP switches or rotary switches
Connecting or wiring cables
Attaching or removing terminal blocks or connectors
Power Supply Design
Turning ON the Power Supply
Actual Operation
Turning OFF the Power Supply
NG NG