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NX-ID
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Omron NX-ID, NX-IA, NX-OC, NX-OD, NX-MD User Manual

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Page 1
Machine Automation Controller
NX-series
Digital I/O Units
User’s Manual
NX-ID NX-IA NX-OC NX-OD NX-MD
Digital I/O Units
W521-E1-07
Page 2
NOTE
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. Neverthe­less, 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.
Trademarks
• Sysmac and SYSMAC are trademarks or registered trademarks of OMRON Corporation in Japan and other countries for OMRON factory automation products.
• Microsoft, Windows, Windows Vista, Excel, and Visual Basic 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.
• Safety over 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.
Copyrights
Microsoft product screen shots reprinted with permission from Microsoft Corporation.
Page 3

Introduction

Thank you for purchasing an NX-series Digital I/O Unit.
This manual contains information that is necessary to use the NX-series Digital I/O Unit. Please read this manual and make sure you understand the functionality and performance of the NX-series Digital I/O 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.
Intended Audience
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 specifications in international standard IEC 61131-3 or Japanese standard JIS B 3503.
Introduction
Applicable Products
This manual covers the following product.
• NX-series Digital I/O Unit
NX-ID /IA /OD/OC/MD
NX-series Digital I/O Unit User’s Manual (W521)
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CONTENTS

CONTENTS
Introduction ..............................................................................................................1
Intended Audience....................................................................................................................................... 1
Applicable Products..................................................................................................................................... 1
Relevant Manuals .....................................................................................................7
Manual Structure ......................................................................................................8
Page Structure and Icons ............................................................................................................................ 8
Special Information...................................................................................................................................... 9
Precaution on Terminology ........................................................................................................................ 10
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....................................................................................... 17
Precautions for Correct Use..................................................................................22
Regulations and Standards................................................................................... 23
Conformance to EU Directives .................................................................................................................. 23
Conformance to UL and CSA Standards ................................................................................................... 24
Conformance to Shipbuilding Standards ................................................................................................... 24
Conformance to KC Standards.................................................................................................................. 24
Software Licenses and Copyrights ............................................................................................................ 24
Unit Versions ..........................................................................................................25
Unit Versions.............................................................................................................................................. 25
Unit Versions and Support Software Versions ........................................................................................... 26
Related Manuals .....................................................................................................27
Terminology ............................................................................................................30
Revision History .....................................................................................................32
Sections in this Manual .........................................................................................33
Section 1 Features and System Configuration
1-1 Features and Types of Digital I/O Units ............................................................................... 1-2
1-1-1 Digital I/O Unit Features.............................................................................................................. 1-2
1-1-2 Digital I/O Unit Types ..................................................................................................................1-3
1-2 System Configuration ........................................................................................................... 1-4
1-2-1 System Configuration in the Case of a CPU Unit........................................................................1-4
1-2-2 System Configuration of Slave Terminals ...................................................................................1-5
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1-3 Model List............................................................................................................................... 1-7
1-3-1 Model Notation............................................................................................................................ 1-7
1-3-2 Digital Input Units...................................................................................................................... 1-10
1-3-3 Digital Output Units................................................................................................................... 1-12
1-3-4 Digital Mixed I/O Units .............................................................................................................. 1-15
1-4 List of Functions.................................................................................................................. 1-16
1-4-1 Digital Input Units...................................................................................................................... 1-16
1-4-2 Digital Output Units................................................................................................................... 1-17
1-4-3 Digital Mixed I/O Units .............................................................................................................. 1-18
1-5 Support Software................................................................................................................. 1-19
Section 2 Specifications
2-1 General Specifications.......................................................................................................... 2-2
2-2 Individual Specifications ...................................................................................................... 2-3
Section 3 Part Names and Functions
CONTENTS
3-1 Part Names............................................................................................................................. 3-2
3-1-1 Screwless Clamping Terminal Block Type.................................................................................. 3-2
3-1-2 M3 Screw Terminal Block Type................................................................................................... 3-7
3-1-3 Connector Types......................................................................................................................... 3-8
3-2 Indicators ............................................................................................................................. 3-13
3-2-1 TS Indicator .............................................................................................................................. 3-15
3-2-2 IN/OUT Indicator....................................................................................................................... 3-16
Section 4 Installation and Wiring
4-1 Installing NX Units................................................................................................................ 4-2
4-1-1 Installing NX Units ...................................................................................................................... 4-2
4-1-2 Attaching Markers....................................................................................................................... 4-4
4-1-3 Removing NX Units .................................................................................................................... 4-6
4-1-4 Installation Orientation................................................................................................................ 4-7
4-2 Power Supply Types and Wiring .......................................................................................... 4-9
4-2-1 Applications of I/O Power Supply and Supply Methods.............................................................. 4-9
4-2-2 Calculating the Total Current Consumption from I/O Power Supply ..........................................4-11
4-3 Wiring the Terminals ........................................................................................................... 4-12
4-3-1 Wiring to the Screwless Clamping Terminal Block.................................................................... 4-12
4-3-2 Wiring to M3 Screw Terminal Block ..........................................................................................4-31
4-3-3 Wiring to MIL/Fujitsu Connectors.............................................................................................. 4-35
4-3-4 Checking the Wiring.................................................................................................................. 4-39
4-4 Wiring Examples.................................................................................................................. 4-40
4-4-1 Wiring the Input Units ............................................................................................................... 4-40
4-4-2 Precautions when Wiring to the Output Units ........................................................................... 4-52
Section 5 I/O Refreshing
5-1 I/O Refreshing ........................................................................................................................ 5-2
5-1-1 I/O Refreshing from CPU Units to NX Units ............................................................................... 5-2
5-1-2 I/O Refreshing from CPU Units or Industrial PCs to Slave Terminal .......................................... 5-3
5-2 I/O Refreshing Methods ........................................................................................................ 5-5
5-2-1 Types of I/O Refreshing Methods ............................................................................................... 5-5
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CONTENTS
5-2-2 Setting the I/O Refreshing Methods............................................................................................ 5-7
5-2-3 Selecting NX Units ......................................................................................................................5-8
5-2-4 Free-Run Refreshing...................................................................................................................5-8
5-2-5 Synchronous Input Refreshing..................................................................................................5-12
5-2-6 Synchronous Output Refreshing...............................................................................................5-16
5-2-7 Time Stamp Refreshing.............................................................................................................5-19
5-2-8 Input Refreshing with Input Changed Time............................................................................... 5-20
5-2-9 Output Refreshing with Specified Time Stamp..........................................................................5-27
5-2-10 An Example of Turning ON Outputs at Specific Times After the Sensor Inputs Change ..........5-33
Section 6 Digital Input Units
6-1 Types of Digital Input Units................................................................................................... 6-2
6-2 Specifications of I/O Data ..................................................................................................... 6-4
6-2-1 Allocable I/O Data ....................................................................................................................... 6-4
6-3 List of Settings....................................................................................................................... 6-7
6-4 Function ............................................................................................................................... 6-13
6-4-1 List of Digital Input Unit Functions.............................................................................................6-13
6-4-2 Input Filter ................................................................................................................................. 6-14
Section 7 Digital Output Units
7-1 Types of Digital Output Units................................................................................................7-2
7-2 Specifications of I/O Data ..................................................................................................... 7-5
7-2-1 Allocable I/O Data ....................................................................................................................... 7-5
7-3 List of Settings....................................................................................................................... 7-9
7-4 Function ............................................................................................................................... 7-12
7-4-1 List of Digital Output Unit Functions..........................................................................................7-12
7-4-2 Load Rejection Output Setting ..................................................................................................7-13
7-4-3 Load Short-circuit Protection.....................................................................................................7-17
7-5 Push-pull Output ................................................................................................................. 7-19
7-6 Precautions when Using the Relay Output Units ............................................................. 7-20
Section 8 Digital Mixed I/O Units
8-1 Types of Digital Mixed I/O Units ........................................................................................... 8-2
8-2 Specifications of I/O Data ..................................................................................................... 8-3
8-2-1 Allocable I/O Data ....................................................................................................................... 8-3
8-3 List of Settings....................................................................................................................... 8-5
8-3-1 Input Settings ..............................................................................................................................8-5
8-3-2 Output Settings ...........................................................................................................................8-6
8-4 Function ................................................................................................................................. 8-7
8-4-1 Input Functions............................................................................................................................8-7
8-4-2 Output Functions......................................................................................................................... 8-7
Section 9 Troubleshooting
9-1 How to Check for Errors ....................................................................................................... 9-2
9-2 Checking for Errors with the Indicators .............................................................................. 9-3
9-3 Checking for Errors and Troubleshooting on the Support Software................................ 9-5
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9-3-1 Checking for Errors from the Sysmac Studio.............................................................................. 9-5
9-3-2 Checking for Errors from Support Software Other Than the Sysmac Studio.............................. 9-6
9-3-3 Event Codes and Corrections for Errors.....................................................................................9-7
9-3-4 Meaning of Error....................................................................................................................... 9-10
9-4 Resetting Errors .................................................................................................................. 9-19
9-5 Troubles Specific To Each Type of NX Units..................................................................... 9-20
9-5-1 Digital Inputs............................................................................................................................. 9-20
9-5-2 Digital Outputs .......................................................................................................................... 9-21
9-6 Troubleshooting Flowchart ................................................................................................ 9-22
Section 10 Inspection and Maintenance
10-1 Cleaning and Inspection .....................................................................................................10-2
10-1-1 Cleaning.................................................................................................................................... 10-2
10-1-2 Periodic Inspection ................................................................................................................... 10-2
10-2 Maintenance Procedures .................................................................................................... 10-5
CONTENTS
Appendices
A-1 Data Sheet ..............................................................................................................................A-2
A-1-1 Model List ................................................................................................................................... A-2
A-1-2 Digital Input Units........................................................................................................................A-7
A-1-3 Digital Output Units...................................................................................................................A-38
A-1-4 Digital Mixed I/O Units ..............................................................................................................A-82
A-2 Dimensions ..........................................................................................................................A-96
A-2-1 Screwless Clamping Terminal Block Type ................................................................................ A-96
A-2-2 M3 Screw Terminal Block Type.................................................................................................A-98
A-2-3 Connector Types.......................................................................................................................A-99
A-3 Connecting Connector-Terminal Block Conversion Units and I/O Relay Terminals ...A-102
A-3-1 Patterns for Combining Connector-Terminal Block Conversion Units
A-3-2 Combinations of Connections................................................................................................. A-104
A-3-3 Connector-Terminal Block Conversion Unit Connection Diagrams ........................................ A-110
A-3-4 Connection Diagrams for I/O Relay Terminals........................................................................A-127
A-4 EMC Directive Measures for Relay Outputs....................................................................A-133
A-5 List of NX Objects..............................................................................................................A-134
A-5-1 Format of Object Descriptions ................................................................................................ A-134
A-5-2 Digital Input Units....................................................................................................................A-135
A-5-3 Digital Output Units.................................................................................................................A-143
A-5-4 Digital Mixed I/O Units ............................................................................................................A-152
A-6 List of Screwless Clamping Terminal Block Models......................................................A-157
A-6-1 Model Notation........................................................................................................................A-157
A-6-2 List of Terminal Block Models ................................................................................................. A-157
A-7 Version Information with CPU Units ................................................................................A-158
A-7-1 Relationship between Unit Versions of Units.......................................................................... A-158
A-8 Version Information with Communications Coupler Units............................................A-160
A-8-1 Connection to an EtherCAT Coupler Unit............................................................................... A-160
A-8-2 Connection to an EtherNet/IP Coupler Unit............................................................................ A-162
A-9 Displaying the Edit Unit Operation Settings Tab Page ..................................................A-164
A-9-1 Connection to the CPU Unit.................................................................................................... A-164
A-9-2 Slave Terminal ........................................................................................................................A-166
and I/O Relay Terminals .........................................................................................................A-102
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CONTENTS
Index
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NX-series Digital I/O Unit User’s Manual (W521)
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Relevant Manuals

The table below provides the relevant manuals for the NX-series Digital I/O Units.
Read all of the manuals that are relevant to your system configuration and application to make the most of the NX-series Digital I/O Units.
Other manuals, such as related product manuals, are necessary for specific system configurations and applications. Refer to Related Manuals on page 27 for the related manuals.
Manual name Application
NX-series Digital I/O Units User's Manual
NX-series Data Reference Man­ual
Learning how to use NX-series Digital I/O Units
Referencing lists of the data that is required to configure systems with NX-series Units
Relevant Manuals
NX-series Digital I/O Unit User’s Manual (W521)
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Manual Structure

4-9
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
stinU gnitnuoM 3-4
4
stnenopmoC rellortnoC gnitcennoC 1-3-4
4-3 Mounting Units
The Units that make up an NJ-series Controller can be connected simply by pressing the Units together and lock ing the slide rs by moving the m toward the back of the U nits. The End Cover is connect ed in the same way to the Unit on the far right side of the Controller.
1 Join the Units so that the connectors fit exactly.
2 The 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.
Precautions for Correct UsePrecautions for Correct Use
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.
Manual Structure

Page Structure and Icons

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.
8
NX-series Digital I/O Unit User’s Manual (W521)
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Precautions for Safe Use
Precautions for Correct Use
Additional Information
Version Information

Special Information

Special information in this manual is classified as follows:
Precautions on what to do and what not to do to ensure safe usage of the product.
Precautions on what to do and what not to do to ensure proper operation and performance.
Additional information to read as required.
This information is provided to increase understanding or make operation easier.
Manual Structure
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 Sup­port Software is given.
Note References are provided to more detailed or related information.
NX-series Digital I/O Unit User’s Manual (W521)
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Manual Structure

Precaution on Terminology

• In this manual, “download” refers to transferring data from the Support Software to a physical device and “upload” refers to transferring data from a physical device to the Support Software.
• In this manual, the directions in relation to the Units are given in the following figure, which shows upright installation.
Up
RightLeft
Down
• This user's manual refers to the NY-series IPC Machine Controller Industrial Panel PCs and Indus­trial Box PCs as simply Industrial PCs or as NY-series Industrial PCs.
• This user's manual refers to the built-in EtherCAT port on an NJ/NX-series Controller or NY-series Industrial PC as simple a built-in EtherCAT port.
• This user's manual may omit manual names and manual numbers in places that refer to the user's manuals for CPU Units and Industrial PCs. The following table gives some examples. When neces­sary, refer to Related Manuals on page 27 to determine the appropriate manual based on the com­mon text for the omitted contents.
Examples:
Manual name Omitted contents Common text
NJ/NX-series CPU Unit Software User's Manual NY-series IPC Machine Controller Industrial Panel PC / Industrial Box PC Software User’s Manual
NJ/NX-series CPU Unit Built-in EtherCAT® Port User's Manual
NY-series IPC Machine Controller Industrial Panel PC / Industrial Box PC Built-in EtherCAT® Port User’s Manual
Software user's manual for the con­nected CPU Unit or Industrial PC
User's manual for built-in EtherCAT port on the connected CPU Unit or Industrial PC
Software User's Manual
Built-in EtherCAT port
10
• This user’s manual may omit manual names and manual numbers in places that refer to the user's manuals for Communications Coupler Units. If you will use a Communications Coupler Unit, refer to Related Manuals on page 27 to identify the manual for your Unit.
NX-series Digital I/O Unit User’s Manual (W521)
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Terms and Conditions Agreement

Terms and Conditions Agreement

Warranty, Limitations of Liability

Warranties
z Exclusive Warranty
Omron’s exclusive warranty is that the Products will be free from defects in materials and workman­ship 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.
z 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.
z 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-com­plying 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 combi­nation with any electrical or electronic components, circuits, system assemblies or any other materi­als 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.
Limitation on Liability; Etc
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CON­SEQUENTIAL 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.
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Terms and Conditions Agreement

Application Considerations

Suitability of Use
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 com­plete determination of the suitability of the Product in combination with the end product, machine, sys­tem, 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 applica­tion responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY 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 EQUIPMENT OR SYSTEM.
Programmable Products
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof.

Disclaimers

Performance Data
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 perfor­mance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications
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.
12
Errors and Omissions
Information presented by Omron Companies has been checked and is believed to be accurate; how­ever, no responsibility is assumed for clerical, typographical or proofreading errors or omissions.
NX-series Digital I/O Unit User’s Manual (W521)
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Safety Precautions

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.

Definition of Precautionary Information

The following notation is used in this manual to provide precautions required to ensure safe usage of an NX-series Digital I/O 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.
Safety Precautions

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.
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Safety Precautions
WARNING

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 sup­plied 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 PC, other Units, or slaves 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 PC will turn OFF all outputs from Output Units in the following cases. The remote I/O slaves will operate according to the settings in the slaves.
• 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 slaves 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 voltage 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.
14
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Voltage and Current Inputs
Caution
Make sure that the voltages and currents that are input to the Units and slaves 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 infor­mation, 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

Safety Precautions
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.
NX Unit power supply
0 V
Peripheral device
(e.g., computer)
Communications Coupler Unit
Non-isolated DC power
supply (internal power
supply circuit)
Peripheral device
cable
24 V
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.
NX-series Digital I/O Unit User’s Manual (W521)
Ground terminal
Unit power supply
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Page 18
Safety Precautions
Online Editing
Execute online editing only after confirming that no adverse effects will be caused by devia­tions in the timing of I/O. If you perform online editing, the task execution time may exceed the task period, I/O may not be refreshed with external devices, input signals may not be read, and output timing may change.
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Precautions for Safe Use

Transporting
• 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.
Mounting
• 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.
Precautions for Safe Use
Installation
• 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.
NG NG
Example: NX Unit (12 mm width)
NX-series Digital I/O Unit User’s Manual (W521)
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Page 20
Precautions for Safe Use
Restricted
region (shaded
portion)
Up
Down
• Do not write on 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 malfunctions in the CPU Rack or the Slave Termi­nal. Refer to the user’s manual for the connected CPU Unit or Communications Coupler Unit for the restricted region of CPU Unit and Communications Coupler Unit.
• 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 Slave Terminal is no longer secured to the DIN Track, which may result in malfunctions.
18
NX-series Digital I/O Unit User’s Manual (W521)
Page 21
Precautions for Safe Use
NG OK
NG NG
Wiring
• 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 termi­nal 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.
• 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.
• If you use reed switches for the input contacts for AC Input Units, use switches with an allowable cur­rent of 1 A or greater. If the capacity of the reed switches is too low, inrush current may fuse the con­tacts.
• Use crimp terminals for wiring the M3 screw terminal blocks. Do not connect bare stranded wires directly to the M3 screw terminal blocks.
Power Supply Design
• Use all Units within the I/O power supply ranges that are given in the specifications.
• Use the I/O power supply current for the CPU Rack of the NX-series NX1P2 CPU Unit at 4 A or less. Using the currents that are outside of the specifications may cause failure or damage.
• 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 slaves 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.
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Precautions for Safe Use
Turning ON the Power Supply
• When you set the Operating Mode at Startup, confirm that no adverse effect will occur in the system.
Actual Operation
• Before you start operation, always register the NX Units that are connected to the Communications Coupler Unit in the host communications master 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 I/O data is valid. Without such programming, the user program cannot distinguish between Units for which I/O refreshing is continued and Units for which I/O refreshing is stopped.
Turning OFF the Power Supply
• Do not disconnect the cable or turn OFF the power supply to the Controller or a Slave Terminal when downloading data or the user program from the Support Software.
• 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
Units that supply power continue to supply power to the Units for up to several seconds after the power supply is turned OFF. The PWR indicator remains lit as long as power is supplied. Confirm that the PWR indicator is not lit before you perform any of the above.
Operation
• Confirm that the controlled system will not be adversely affected before you perform any of the fol­lowing operations.
Changing the operating mode of the CPU Unit or the Industrial PC (including changing the setting of the Operating Mode at Startup) Changing the user program or settings Changing set values or present values Forced refreshing
• Always sufficiently check the safety at the connected devices before you change the settings of a slave or Unit.
20
General Communications
• Do not exceed the ranges that are given in the specifications for the communications distance and number of connected Units.
• Refer to the user’s manual for the Communications Coupler Unit for precautions for the safe use of communications with the connected Communications Coupler Unit.
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Precautions for Safe Use
Unit Replacement
• When you replace a Unit, start operation only after you transfer the settings and variables that are required for operation to the new Unit.
Disposal
• Dispose of the product according to local ordinances as they apply.
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Precautions for Correct Use

Precautions for Correct Use
Storage, Mounting, and Wiring
• Follow the instructions in this manual to correctly perform installation and wiring.
• Do not operate or store the Units in the following locations. Doing so may result in malfunction, in operation stopping, or in burning.
Locations subject to direct sunlight Locations subject to temperatures or humidity outside the range specified in the specifications Locations subject to condensation as the result of severe changes in temperature Locations subject to corrosive or flammable gases Locations subject to dust (especially iron dust) or salts Locations subject to exposure to water, oil, or chemicals Locations subject to shock or vibration
• Take appropriate and sufficient countermeasures during installation in the following locations.
Locations subject to strong, high-frequency noise Locations subject to static electricity or other forms of noise Locations subject to strong electromagnetic fields Locations subject to possible exposure to radioactivity Locations close to power lines
• Before touching a Unit, be sure to first touch a grounded metallic object in order to discharge any static build-up.
• Use the rated power supply voltage for the Units that supply power. Take appropriate measures to ensure that the specified power with the rated voltage and frequency is supplied in places where the power supply is unstable.
• Install the Units away from sources of heat and ensure proper ventilation. Not doing so may result in malfunction, in operation stopping, or in burning.
• Do not allow foreign matter to enter the openings in the Unit. Doing so may result in Unit burning, electric shock, or failure.
Actual Operation
• If you change the event level of an error, the output status when the error occurs may also change. Confirm safety before you change an event level.
Turning OFF the Power Supply
• Do not turn OFF the power supply while data is being transferred.
• Do not turn OFF the power supply while parameters are being written to the CPU Unit, the Communi­cations Coupler Unit or NX Units.
General Communications
• Refer to the user’s manual for the Communications Coupler Unit for precautions for the correct use of communications with the connected Communications Coupler Unit.
22
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Page 25

Regulations and Standards

Conformance to EU Directives

Applicable Directives
• EMC Directives
• Low Voltage Directive
Concepts
z EMC Directives
OMRON devices that comply with EU Directives also conform to the related EMC standards so that they can be more easily built into other devices or the overall machine. The actual products have been checked for conformity to EMC standards.*1
Whether the products conform to the standards in the system used by the customer, however, must be checked by the customer. EMC-related performance of the OMRON devices that comply with EU Directives will vary depending on the configuration, wiring, and other conditions of the equipment or control panel on which the OMRON devices are installed. The customer must, therefore, perform the final check to confirm that devices and the overall machine conform to EMC standards.
Regulations and Standards
*1. Applicable EMC (Electromagnetic Compatibility) standards are as follows:
EMS (Electromagnetic Susceptibility): EN 61131-2 EMI (Electromagnetic Interference): EN 61131-2 (Radiated emission: 10-m regulations).
z Low Voltage Directive
Always ensure that devices operating at voltages of 50 to 1,000 VAC and 75 to 1,500 VDC meet the required safety standards. The applicable directive is EN 61010-2-201.
z Conformance to EU Directives
The NX-series Units comply with EU Directives. To ensure that the machine or device in which the NX-series Units are used complies with EU Directives, the following precautions must be observed.
• The NX-series Units must be installed within a control panel.
• You must use SELV power supply for the DC power supplies that are connected as the Unit power supplies and I/O power supplies for the NX-series Units.
We recommend that you use the OMRON S8VK-S series Power Supplies for the CPU Racks with NX-series NX1P2 CPU Units. We recommend that you use the OMRON S8JX-series Power Sup­plies for Slave Terminals. EMC standard compliance was confirmed for these recommended Power Supplies.
• NX-series Units that comply with EU Directives also conform to the Common Emission Standard (EN 61131-2). Radiated emission characteristics (10-m regulations) may vary depending on the configuration of the control panel used, other devices connected to the control panel, wiring, and other conditions.
You must therefore confirm that the overall machine or equipment in which the NX-series Units are used complies with EU Directives.
• You must use power supplies with an output hold time of 10 ms or longer for the DC power sup­plies that are connected as the Unit power supplies and I/O power supplies for the NX-series Units.
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Regulations and Standards
• This is a Class A product (for industrial environments). In a residential environment, it may cause radio interference. If radio interference occurs, the user may be required to take appropriate mea­sures.

Conformance to UL and CSA Standards

Some NX-series products comply with UL and CSA standards. If you use an NX-series product that complies with UL or CSA standards and the machinery or system in which you use the NX-series prod­uct must also comply with the standards, refer to the Instruction Sheet that is provided with the product. The Instruction Sheet provides the application conditions for complying with the standards.

Conformance to Shipbuilding Standards

Some NX-series products comply with shipbuilding standards. If you use an NX-series product that complies with shipbuilding standards and the machinery or system in which you use the NX-series product must also comply with the standards, consult with your OMRON representative. Application conditions are defined according to the installation location. Application may not be possible for some installation locations.
For usage conditions for shipbuilding standards, refer to Conformance to Shipping Standards in the user's manual for the CPU Unit or Communications Coupler Unit that the NX Units are connected to.

Conformance to KC Standards

Observe the following precaution if you use NX-series Units in Korea.
Class A Device (Broadcasting Communications Device for Office Use)
This device obtained EMC registration for office use (Class A), and it is intended to be used in places other than homes.
Sellers and/or users need to take note of this.

Software Licenses and Copyrights

This product incorporates certain third party software. The license and copyright information associated with this software is available at http://www.fa.omron.co.jp/nj_info_e/.
24
NX-series Digital I/O Unit User’s Manual (W521)
Page 27

Unit Versions

Notched
area
Unit
specifications
LOT No.
Unit version
Lot number
Unit model number
Lot number and unit version
This section describes the notation that is used for unit versions, the confirmation method for unit ver­sions, and the relationship between unit versions and Support Software versions.

Unit Versions

A “unit version” has been introduced to manage the Units in the NX Series according to differences in functionality accompanying Unit upgrades.
An example is provided below for Communications Coupler Units and NX Units. For the notation that is used for the unit versions of CPU Units or Industrial PCs and the confirmation method for unit versions, refer to the user’s manual for each Unit.
Notation of Unit Versions on Products
Unit Versions
The unit version is given with the Unit specifications on the side of the Unit or in the notched area.
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Unit Versions
The following information is provided in the Unit specifications on the Unit.
Unit model number Gives the model of the Unit.
Unit version Gives the unit version of the Unit.
Lot number Gives the lot number of the Unit.
The following information is provided in the notched area on the Unit.
Name Function
Lot number and unit version
Name Function
DDMYY: Lot number, : Used by OMRON.
“M” gives the month (1 to 9: January to September, X: October, Y: November, Z: December)
Gives the lot number and unit version of the Unit.
• DDMYY: Lot number, : Used by OMRON. “M” gives the month (1 to 9: January to September, X: October, Y: November, Z: December)
•1: Unit version The decimal portion of the unit version is omitted. (It is provided in the Unit specifications.)
Confirming Unit Versions with the Support Software
If your NX Unit is connected to a CPU Unit, refer to the user’s manual of the connected CPU Unit for the confirmation method for the unit version of the NX Unit.
If your NX Unit is connected to a Communications Coupler Unit, refer to the user’s manual of the con­nected Communications Coupler Unit for the confirmation method for the unit version of the Communi­cations Coupler Unit and NX Unit.

Unit Versions and Support Software Versions

The functions that are supported depend on the unit version of the Unit. The version of Support Soft­ware that supports the functions that were added for an upgrade is required to use those functions.
Refer to A-7 Version Information with CPU Units on page A-158 or A-8 Version Information with Communications Coupler Units on page A-160 for the functions that are supported by each unit version.
26
NX-series Digital I/O Unit User’s Manual (W521)
Page 29

Related Manuals

The following table shows related manuals. Use these manuals for reference.
Manual name Cat. No. Model numbers Application Description
NX-series Digital I/O Units User’s Manual
NX-series Data Refer­ence Manual
NX-series System Units User’s Manual
Sysmac Studio Version 1 Operation Manual
NX-IO Configurator Operation Manual
NJ/NX-series Trouble­shooting Manual
NY-series Troubleshooting Manual
NX-series EtherCAT® Coupler Unit User’s Manual
W521 NX-ID
NX-IA
NX-OC
NX-OD
NX-MD
W525 NX- Referencing lists of
W523 NX-PD1
NX-PF0
NX-PC0
NX-TBX01
W504 SYSMAC-
SE2
W585 CXONE-
ALD-V4
W503 NX701-
NJ501-
NJ301-
NJ101-
NX1P2-
W564 NY532-
NY512-
W519 NX-ECC20 Learning how to
Learning how to use NX-series Dig­ital I/O Units
the data that is required to config­ure systems with NX-series Units Learning how to use NX-series System Units
Learning about the operating proce­dures and func­tions of the Sysmac Studio
Learning about the operating proce­dures and func­tions of the NX-IO Configurator.
Learning about the errors that may be detected in an NJ/NX-series Con­troller
Learning about the errors that may be detected in an NY-series Indus­trial PC
use an NX-series EtherCAT Coupler Unit and Ether­CAT Slave Termi­nals
The hardware, setup methods, and functions of the NX-series Digital I/O Units are described.
Lists of the power consumptions, weights, and other NX Unit data that is required to configure systems with NX-series Units are provided.
The hardware and functions of the NX-series System Units are described.
Describes the operating procedures of the Sysmac Studio.
Describes the operating procedures of the NX-IO Configurator.
Concepts on managing errors that may be detected in an NJ/NX-series Con­troller and information on individual errors are described.
Concepts on managing errors that may be detected in an NY-series Controller and information on individual errors are described.
The following items are described: the overall system and configuration meth­ods of an EtherCAT Slave Terminal (which consists of an NX-series Ether­CAT Coupler Unit and NX Units), and information on hardware, setup, and functions to set up, control, and monitor NX Units through EtherCAT.
Related Manuals
NX-series Digital I/O Unit User’s Manual (W521)
27
Page 30
Related Manuals
Manual name Cat. No. Model numbers Application Description
NX-series Ether-
Net/IPTM Coupler Unit User’s Manual
NX-series CPU Unit Hardware User’s Man­ual
NX-series NX1P2 CPU Unit Hardware User’s Manual
NJ-series CPU Unit Hardware User’s Man­ual
NY-series IPC Machine Controller Industrial Panel PC Hardware User’s Manual
W536 NX-EIC202 Learning how to
use an NX-series EtherNet/IP Cou­pler Unit and Eth­erNet/IP Slave Terminals
W535 NX701- Learning the basic
specifications of the NX-series NX701 CPU Units, including introduc­tory information, designing, installa­tion, and mainte­nance.
Mainly hardware information is pro­vided.
W578 NX1P2- Learning the basic
specifications of the NX-series NX1P2 CPU Units, including introduc­tory information, designing, installa­tion, and mainte­nance. Mainly hardware informa­tion is provided.
W500 NJ501-
NJ301-
NJ101-
W557 NY532- Learning the basic
Learning the basic specifications of the NJ-series CPU Units, including introductory infor­mation, designing, installation, and maintenance.
Mainly hardware information is pro­vided.
specifications of the NY-series Industrial Panel PCs, including introductory infor­mation, designing, installation, and maintenance. Mainly hardware information is pro­vided.
The following items are described: the overall system and configuration meth­ods of an EtherNet/IP Slave Terminal (which consists of an NX-series Ether­Net/IP Coupler Unit and NX Units), and information on hardware, setup, and functions to set up, control, and monitor NX Units. An introduction to the entire NX701 CPU Unit system is provided along with the following information on the CPU Unit.
• Features and system configuration
• Overview
• Part names and functions
• General specifications
• Installation and wiring
• Maintenance and Inspection
An introduction to the entire NX1P2 CPU Unit system is provided along with the following information on the CPU Unit.
• Features and system configuration
• Overview
• Part names and functions
• General specifications
• Installation and wiring
• Maintenance and Inspection An introduction to the entire NJ-series system is provided along with the fol­lowing information on the CPU Unit.
• Features and system configuration
• Overview
• Part names and functions
• General specifications
• Installation and wiring
• Maintenance and Inspection
An introduction to the entire NY-series system is provided along with the fol­lowing information on the Industrial Panel PC.
• Features and system configuration
• Introduction
• Part names and functions
• General specifications
• Installation and wiring
• Maintenance and inspection
28
NX-series Digital I/O Unit User’s Manual (W521)
Page 31
Manual name Cat. No. Model numbers Application Description
NY-series IPC Machine Controller Industrial Box PC Hardware User's Manual
NJ/NX-series CPU Unit Software User's Manual
NY-series IPC Machine Controller Industrial Panel PC / Industrial Box PC Software User’s Manual
NJ/NX-series Instruc­tions Reference Manual
NY-series Instructions Reference Manual
W556 NY512- Learning the basic
specifications of the NY-series Industrial Box PCs, including introduc­tory information, designing, installa­tion, and mainte­nance. Mainly hardware informa­tion is provided.
W501 NX701-
NJ501-
NJ301-
NJ101-
NX1P2-
W558 NY532-
NY512-
W502 NX701-
NJ501-
NJ301-
NJ101-
NX1P2-
W560 NY532-
NY512-
Learning how to program and set up an NJ/NX-series CPU Unit.
Mainly software information is pro­vided.
Learning how to program and set up the Controller functions of an NY-series Indus­trial PC
Learning detailed specifications on the basic instruc­tions of an NJ/NX-series CPU Unit
Learning detailed specifications on the basic instruc­tions of an NY-series Indus­trial PC
An introduction to the entire NY-series system is provided along with the fol­lowing information on the Industrial Box PC.
• Features and system configuration
• Introduction
• Part names and functions
• General specifications
• Installation and wiring
• Maintenance and inspection The following information is provided
on an NJ/NX-series CPU Unit.
• CPU Unit operation
• CPU Unit features
• Initial settings
• Programming based on IEC 61131-3 language specifications
The following information is provided on NY-series Machine Automation Con­trol Software.
• Controller operation
• Controller features
• Controller settings
• Programming based on IEC 61131-3 language specifications The instructions in the instruction set (IEC 61131-3 specifications) are described.
The instructions in the instruction set (IEC 61131-3 specifications) are described.
Related Manuals
NX-series Digital I/O Unit User’s Manual (W521)
29
Page 32

Terminology

Terminology
Term
application layer status, AL status --- Status for indicating information on errors that occur in an application on
CAN application protocol over Ether­CAT CAN in Automation CiA CiA is the international users' and manufacturers' group that develops
Communications Coupler Units --- The generic name of an interface unit for remote I/O communications on
CPU Rack --- A rack to which a CPU Unit is mounted. For an NX-series NX1P2 CPU
DC time --- Time indicated by the clock shared between the CPU Unit and the NX
device profile --- A collection of device dependent information and functionality providing
device variable --- A variable that is used to access a specific device through an I/O port by
distributed clock DC Clock distribution mechanism used to synchronize EtherCAT slaves and
EtherCAT slave controller ESC A controller for EtherCAT slave communications. EtherCAT slave information ESI An XML file that contains setting information for an EtherCAT slave. EtherCAT state machine ESM An EtherCAT communications state machine. EtherCAT Technology Group ETG The ETG is a global organization in which OEM, end users, and technol-
I/O map settings --- Settings that assign variables to I/O ports. Assignment information
I/O port --- A logical interface that is used by the NJ/NX-series CPU Unit or
I/O refreshing --- Cyclic data exchange with external devices that is performed with prede-
index --- Address of an object within an application process. network configuration information --- The EtherCAT network configuration information held by the EtherCAT
NX bus --- The NX-series internal bus. object --- An abstract representation of a particular component within a device,
object dictionary OD Data structure that contains description of data type objects, communi-
Abbre­viation
a slave.
CoE A CAN application protocol service implemented on EtherCAT.
and supports higher-layer protocols.
a network between NX Units and a host network master.
Unit, a CPU Rack has a CPU Unit with NX Units and an End Cover mounted to it.
Units in a CPU Rack for an NX-series NX1P2 CPU Unit. EtherCAT slaves that support distributed clock synchronization have a clock that is shared by all slaves in the network. The time that is based on this distrib­uted clock is called the DC time. The same clock is shared by an NX-series NX1P2 CPU Unit, NX Units connected to the CPU Unit, and applicable EtherCAT slaves.
consistency between similar devices of the same device type.
an NJ/NX-series CPU Unit or NY-series Industrial PC. Process data on an EtherCAT slave is allocated to this variable. For an NX-series NX1P2 CPU Unit, I/O data for the NX Units on a CPU Unit is allocated. A user application on a CPU Unit or Industrial PC accesses a device that can be connected, by directly reading and writing this device variable.
the EtherCAT master.
ogy providers join forces to support and promote the further technology development.
between I/O ports and variables.
NY-series Industrial PC to exchange data with an external device (slave or Unit).
termined memory addresses.
master.
which consists of data, parameters, and methods.
cation objects and application objects.
Description
30
NX-series Digital I/O Unit User’s Manual (W521)
Page 33
Terminology
Term
Operational --- A state in EtherCAT communications where SDO communications and
PDO communications --- An acronym for process data communications. Pre-Operational --- A state in EtherCAT communications where only SDO communications
primary periodic task --- The task with the highest priority. process data --- Collection of application objects designated to be downloaded cyclically
process data communications --- One type of EtherCAT communications in which process data objects
process data object PDO A structure that describes the mappings of parameters that have one or
receive PDO RxPDO A process data object received by an EtherCAT slave. Safe-Operational --- A state in EtherCAT communications where only SDO communications
SDO communications --- One type of EtherCAT communications in which service data objects
service data object SDO CoE asynchronous mailbox communications where all objects in the
Slave Information Interface SII Slave information that is stored in non-volatile memory in the slave. Slave Terminal --- A building-block remote I/O terminal to which a Communications Cou-
subindex --- Sub-address of an object within the object dictionary. Sync0 --- A signal that gives the interrupt timing based on the distributed clock
Sync Manager SM Collection of control elements to coordinate access to concurrently used
task period --- The interval at which the primary periodic task or a periodic task is exe-
transmit PDO TxPDO A process data object sent from an EtherCAT slave.
Abbre­viation
Description
I/O are possible.
are possible with the slaves, i.e., no I/O can be performed.
or acyclically for the purpose of measurement and control.
(PDOs) are used to exchange information cyclically and in realtime. This is also called PDO communications.
more process data entities.
and reading input data from slaves are possible. Outputs from slaves are not performed.
(SDOs) are used to transmit information whenever required.
object dictionary can be read and written.
pler Unit and NX Units are mounted
(DC) in EtherCAT communications. The slaves execute controls accord­ing to this interrupt timing.
objects.
cuted.
NX-series Digital I/O Unit User’s Manual (W521)
31
Page 34

Revision History

Cat. No.
W521-E1-07
Revision code
Revision History
A manual revision code appears as a suffix to the catalog number on the front and back covers of the manual.
Revision code Date Revised content
01 April 2013 Original production 02 June 2013 Added time stamp refreshing, models on time stamp refreshing and cor-
03 September 2013 Added information on the NX-IA3117/OC2733 and corrected mistakes. 04 July 2014 Added information on the
05 April 2015 • Added information on the
06 October 2016 • Made changes accompanying the addition of NX-OC4633.
07 June 2017 • Made changes accompanying the upgrade of the NX-ECC203 unit ver-
rected mistakes.
NX-ID5142-5/ID6142-5/OD5121-5/OD5256-5/OD6121-5/OD6256-5/MD 6121-5/MD6256-5 and corrected mistakes.
NX-ID5142-1/ID6142-6/OD3268/OD5121-1/OD5256-1/OD6121-6/MD 6121-6.
• Made changes accompanying the addition of the NX-series CPU Unit.
• Corrected mistakes.
• Made changes to add NY-series IPC Machine Controller Industrial Panel PCs and Industrial Box PCs.
• Made changes accompanying the addition of the NX-series NX1P2 CPU Unit.
• Corrected mistakes.
sion to version 1.5.
• Made changes accompanying the upgrade of the NX-EIC202 unit ver­sion to version 1.2.
• Corrected mistakes.
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1
2
3
4
5
6
7
8
9
1
10
2A
3I
4
5
6
7
8
9
Features and System Configuration
Specifications
Part Names and Functions
Installation and Wiring
I
Index
I/O Refreshing
10
A
Appendices
Digital Output Units
Digital Input Units
Digital Mixed I/O Units
Troubleshooting
Inspection and Maintenance

Sections in this Manual

Sections in this Manual
NX-series Digital I/O Unit User’s Manual (W521)
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Sections in this Manual
34
NX-series Digital I/O Unit User’s Manual (W521)
Page 37
Features and System Configura­tion
This section describes NX system configuration and the types of Digital I/O Units.
1-1 Features and Types of Digital I/O Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-1-1 Digital I/O Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1-1-2 Digital I/O Unit Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1-2 System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1-2-1 System Configuration in the Case of a CPU Unit . . . . . . . . . . . . . . . . . . . . . . . 1-4
1-2-2 System Configuration of Slave Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1-3 Model List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1-3-1 Model Notation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
1-3-2 Digital Input Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
1-3-3 Digital Output Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
1-3-4 Digital Mixed I/O Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
1-4 List of Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
1-4-1 Digital Input Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
1-4-2 Digital Output Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
1-4-3 Digital Mixed I/O Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
1-5 Support Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
1
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration
NX Units: e.g., NX-series Degital I/O Units
NX-series EtherCAT Coupler Unit
NX-series NX1P2 CPU Unit
Example:
1-1 Features and Types of Digital I/O
Units
This section describes features and types of Digital I/O Units.

1-1-1 Digital I/O Unit Features

The Digital I/O Units are NX Units to process inputs and outputs of digital signals (ON/OFF signals).
The NX-series Digital I/O Units have the following features.
Can be Connected to a CPU Unit or Communications Coupler Unit
NX Unit NX-series Digital I/O Units can be connected to the following Units.
• NX-series CPU Unit
• NX-series Communications Coupler Unit
When a CPU Unit and a Communications Coupler Unit are used together, you can unify the methods for installing, wiring, and setting up NX Units, and eventually reduce design costs.
*1
*1. For whether NX Units can be connected to the CPU Unit or Communications Coupler Unit to be used, refer to
Synchronous I/O with Refresh Cycle of the NX Bus
When the NX-series CPU Units or EtherCAT Coupler Unit is used together with NX Units that support synchronous I/O refreshing, the I/O control of multiple NX Units can be synchronized at the time to syn­chronize with the refresh cycle of the NX bus.
This provides an accurate I/O control because it suppresses jitter in the I/O timing of multiple NX Units.
1 - 2
the user's manual for the CPU Unit or Communications Coupler Unit to be used.
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration
Controlling Outputs at Fixed Intervals After Inputs Change
You can use NX-series CPU Units or EtherCAT Coupler Units with NX Units that support input refresh­ing with input changed time and with other NX Units that support output refreshing with specified time stamp to control the outputs at fixed intervals after the sensor inputs change.
1-1 Features and Types of Digi-
tal I/O Units
External output device (Output)
Workpiece
Sensor (Input)
Fixed interval
When input changes When output is made
Simple I/O Wiring with a Screwless Clamping Terminal Block
The terminal block is a screwless clamping terminal block.
You can connect the wires simply by pushing the ferrules into the terminals. The amount of wiring work is reduced without requiring the use of screws.
1

1-1-2 Digital I/O Unit Types

1-1-2 Digital I/O Unit Types
The types of Digital I/O Units are as follows.
Type Purpose
Digital Input Units These are Units with functionality to process input of digital signals from sensors
and other connected external devices.
Digital Output Units These are Units with functionality to process output of digital signals to relays and
other connected external devices.
Digital Mixed I/O Units These are Units with functionality to process input of digital signals from connected
external devices as well as functionality to process output of digital signals to con­nected external devices.
Refer to 1-3 Model List on page 1-7 for details on Digital I/O Unit models and 1-4 List of Functions on page 1-16 for details on their functions.
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1 Features and System Configuration
(A) NX-series CPU Unit
EtherCAT Slave Terminal
(D) Support Software
Sysmac Studio
Built-in EtherCAT port
Connect to built-in EtherNet/IP port
(B) NX Units
● CPU Rack
NX1P2-
(C) End Cover
EtherCAT
NX Units
EtherCAT Coupler Unit

1-2 System Configuration

NX Unit NX-series Digital I/O Units can be connected to the following Units.
• NX-series CPU Unit
• NX-series Communications Coupler Unit
The following explains the system configuration for each NX Unit connection destination.

1-2-1 System Configuration in the Case of a CPU Unit

The following figure shows a system configuration when a group of NX Units is connected to an NX-series CPU Unit.
You can connect the EtherCAT Slave Terminal to the built-in EtherCAT port on the CPU Unit. Refer to 1-2-2 System Configuration of Slave Terminals on page 1-5 for details on the system configuration of a Slave Terminal.
Sym-
bol
(A) NX-series CPU Unit The Unit that serves as the center of control for a Machine Automation Con-
(B) NX Units The NX Units perform I/O processing with connected external devices. The
Item Description
troller. It executes tasks, refreshes I/O for other Units and slaves, etc. NX Units can be connected to an NX1P2 CPU Unit.
NX Units exchange data with the CPU Unit through I/O refreshing. A maximum of eight NX Units can be connected to an NX1P2 CPU Unit.
1 - 4
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration
(A) EtherCAT master
NJ/NX-series CPU Unit, NY-series Industrial PC, or master from another manufacturer
(G) Communications cable
Ethernet cables
(B) NX Series
EtherCAT Coupler Unit NX-ECC20
• EtherCAT Slave Terminal
(E) Support Software
*1
(E) Support Software
(F) ESI files
(D) End Cover
(C) NX Units
EtherCAT port
(F) ESI files
Peripheral USB port
.xml
.xml
Connection to peripheral USB port on EtherCAT Coupler Unit
*1. The connection method for the Support Software depends on the model of the CPU Unit or Industrial PC.
1-2 System Configuration
Sym-
bol
(C) End Cover The End Cover is attached to the end of a CPU Rack. (D) Support Software
(Sysmac Studio)
Item Description
A computer software application for setting, programming, debugging, and troubleshooting NJ/NX/NY-series Controllers.
For an NX1P2 CPU Unit, this application performs setting operation by making a connection to a built-in EtherNet/IP port.
1-2-2 System Configuration of Slave Terminals
A building-block remote I/O slave provided with a group of NX Units connected to a Communications Coupler Unit is generically called a Slave Terminal.
The NX Units can be flexibly combined with a Communications Coupler Unit to achieve the optimum remote I/O slave for the application with less wiring, less work, and less space.
The following figure shows an example of the system configuration when an EtherCAT Coupler Unit is used as a Communications Coupler Unit.
Refer to the user's manual for the connected Communications Coupler Unit for details on how to config­ure the system when any other type of Communications Coupler Unit is used.
1

1-2-2 System Configuration of Slave Terminals

NX-series Digital I/O Unit User’s Manual (W521)
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Page 42
1 Features and System Configuration
Let-
ter
(A)
EtherCAT master
Item Description
*1
The EtherCAT master manages the network, monitors the status of slaves, and exchanges I/O data with slaves.
(B) EtherCAT Coupler Unit The EtherCAT Coupler Unit serves as an interface for process data communi-
cations on the EtherCAT network between the NX Units and the EtherCAT master.
The I/O data for the NX Units is accumulated in the EtherCAT Coupler Unit and then all of the data is exchanged with the EtherCAT master at the same time.
The EtherCAT Coupler Unit can also perform message communications (SDO communications) with the EtherCAT master.
(C) NX Units The NX Units perform I/O processing with connected external devices.
The NX Units perform process data communications with the EtherCAT mas-
ter through the EtherCAT Coupler Unit. (D) End Cover The End Cover is attached to the end of the Slave Terminal. (E)
Support Software*2
*3
The Support Software runs on a personal computer and it is used to configure
the EtherCAT network and EtherCAT Slave Terminal, and to program, monitor,
and troubleshoot the Controllers. (F) ESI (EtherCAT Slave
Information) file
The ESI files contain information that is unique to the EtherCAT Slave Termi-
nals in XML format. You can load an ESI file into the Support Software to eas-
ily allocate Slave Terminal process data and make other settings.
The ESI files for OMRON EtherCAT slaves are installed in the Support Soft-
ware. You can obtain the ESI files for the latest models through the Support
Software’s automatic update function. (G) Communications cable Use a double-shielded cable with aluminum tape and braiding of Ethernet cat-
egory 5 (100Base-TX) or higher, and use straight wiring.
*1. An EtherCAT Slave Terminal cannot be connected to any of the OMRON CJ1W-NC81/82 Position Control
Units even though they can operate as EtherCAT masters.
*2. The term Support Software indicates software that is provided by OMRON. If you connect to a master from
another company, use the software tool corresponding to that master.
*3. Refer to 1-5 Support Software on page 1-19 for information on Support Software.
1 - 6
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration
     - - 
1-3 Model List
1-3-1 Model Notation
The Digital I/O Unit models are assigned based on the following rules.
Unit type
ID : DC input IA : AC input OD : Transistor output OC : Relay output MD : DC input/Transistor output
Number of points
2 : 2 points 3 : 4 points 4 : 8 points 5 : 16 points 6 : 32 points, or 16 points each for inputs and outputs
NX - - 

1-3 Model List

1

1-3-1 Model Notation

I/O type
Number Inputs Outputs Mixed I/O (Input, Output)
For both NPN/PNP
1
2
−
NPN
3
PNP
4
6
−
7
−
Other specifications Refer to Other specifications on the next page.
External connection terminals
External connection terminalsNumber
None
Screwless clamping terminal block
M3 screw terminal block
-1
MIL connector
-5
Fujitsu connector
-6
NPN
PNP
−
−
N.O.
N.O. + N.C.
For both NPN/PNP, NPN
For both NPN/PNP, PNP
−
−
−
−
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1 Features and System Configuration
Other Specifications
z Digital Input Units
ON/OFF response
time
Num
17
42 43 --- Yes Yes --­44 --- Yes --- Yes
*1. Free-Run refreshing
*2. Synchronous I/O refreshing
ber
Input voltage
12 to 24 VDC or 240 VAC
24 VDC
Exceeds
1 μs
Yes --- Yes ---
Yes --- Yes ---
1 μs max.
Free-Run refreshing
Switching Synchronous I/O
refreshing
refreshing
I/O refreshing method
*1
only
or
*2
and Free-Run
Input refreshing with input
changed time only
z Digital Output Units
ON/OFF response
time
Free-Run refresh-
Num
ber
21 33 2 A Yes --- Yes --- --­53 54 --- Yes --- Yes --­56 Yes --- Yes --- Yes 57 --- Yes Yes --- Yes 58 --- Yes --- Yes Yes 68 2 A Yes --- Yes --- Yes
*1. Free-Run refreshing
*2. Synchronous I/O refreshing
Rated volt-
age
12 to 24 VDC or 240 VAC
24 VDC
Load
cur­rent
0.5 A Yes --- Yes --- ---
0.5 A
Exceed
s 1 μs
--- Yes Yes --- ---
1 μs
max.
refreshing
Free-Run refresh-
I/O refreshing method
ing *1 only
or
Switching Syn-
chronous I/O
*2
and
ing
Output refresh-
ing with speci-
fied time stamp
only
Other func-
tions
Load
short-circuit
protection
1 - 8
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1 Features and System Configuration
z Digital Mixed I/O Units
Input section Output section
Num
ber
21
56
Rated input
voltage
24 VDC
Rated
volt-
age
12 to 24 VDC
24 VDC
Load
current
0.5 A
Refer to Section 5 I/O Refreshing for details on the I/O refreshing method.
ON/OFF response time
I/O refreshing
Exceeds
1 μs
Yes ---
Yes --- ---
1 μs max.
Switching Synchro­nous I/O refresh­ing and Free-Run refreshing
method
1-3 Model List
Other func-
tions Load
short-circuit
protection
1
Yes
1-3-1 Model Notation
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration

1-3-2 Digital Input Units

This section shows the specifications for Digital Input Units.
Refer to A-1-2 Digital Input Units on page A-7 for details on the specifications of individual Digital Input Units.
DC Input Units (Screwless Clamping Terminal Block, 12 mm Width)
Num
ber
Model
NX-ID3317
NX-ID3343
NX-ID3344
NX-ID3417
NX-ID3443
NX-ID3444
NX-ID4342
NX-ID4442
NX-ID5342
NX-ID5442
Internal I/O
of
poin
4 point s
8 point s
16 point s
common
ts
NPN
PNP
NPN
PNP P. A-20
NPN P. A-22
PNP P. A-24
Rated input
voltage
12 to 24 VDC
24 VDC
12 to 24 VDC
24 VDC
I/O refreshing
method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
Input refreshing with input changed time only
Switching Synchro­nous I/O refreshing and Free-Run refreshing
Input refreshing with input changed time only
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF response
time
20 μs max./400 μs max.
100 ns max./100 ns max.
20 μs max./400 μs max.
100 ns max./100 ns max.
20 μs max./400 μs max.
Reference
P. A -9
P. A -11
P. A -1 3
P. A -1 4
P. A -1 6
P. A -1 7
P. A -1 8
1 - 10
DC Input Units (M3 Screw Terminal Block, 30 mm Width)
Num
ber
Model
NX-ID5142-1
of
poin
ts
16 point s
Internal I/O
common
For both NPN/PNP
Rated input
voltage
24 VDC
I/O refreshing
method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
NX-series Digital I/O Unit User’s Manual (W521)
ON/OFF response
time
μs
max./400 μs
20 max.
Reference
P. A -2 6
Page 47
1 Features and System Configuration
DC Input Units (MIL Connector, 30 mm Width)
Num
ber
Model
NX-ID5142-5
NX-ID6142-5
of
poin
ts
16 point s
32 point s
Internal I/O
common
For both NPN/PNP
For both NPN/PNP
Rated input
voltage
24 VDC
24 VDC P. A-30
I/O refreshing
method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
DC Input Units (Fujitsu Connector, 30 mm Width)
Num
ber
Model
NX-ID6142-6
of
poin
ts
32 point s
Internal I/O
common
For both NPN/PNP
Rated input
voltage
24 VDC
I/O refreshing
method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF response
time
μ
s max./400 μs
20 max.
ON/OFF response
time
μ
s max./400 μs
20 max.
Reference
P. A -2 8
Reference
P. A -3 3
1-3 Model List
1
1-3-2 Digital Input Units
AC Input Units (Screwless Clamping Terminal Block, 12 mm Width)
Num
Model
NX-IA3117
ber
of
poin
ts
4 point s
Rated input voltage
200 to 240 VAC, 50/60 Hz (170 to 264 VAC, ±3 Hz)
I/O refreshing
method
Free-Run refreshing
ON/OFF response
time
10 ms max./40 ms max.
Reference
P. A -3 6
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration

1-3-3 Digital Output Units

This section shows the specifications for Digital Output Units.
Refer to A-1-3 Digital Output Units on page A-38 for details on the specifications of individual Digital Output Units.
Transistor Output Units (Screwless Clamping Terminal Block, 12 mm Width)
Model
NX-OD2154
NX-OD2258
NX-OD3121
NX-OD3153
NX-OD3256
NX-OD3257
NX-OD3268
NX-OD4121
NX-OD4256
NX-OD5121
NX-OD5256
Num­ber of points
2 points
4 points
8 points
16 points
Maximum
Internal I/O
common
NPN
PNP P. A-42
NPN
PNP
NPN
PNP
NPN
PNP
value of
load cur-
rent
0.5 A/point, 1 A/Unit
0.5 A/point, 2 A/Unit
2 A/point, 8 A/Unit
0.5 A/point, 4 A/Unit
Rated volt-
age
24 VDC
12 to 24 VDC
24 VDC
12 to 24 VDC
24 VDC
12 to 24 VDC
24 VDC
I/O refresh-
ing method
Output refreshing with speci­fied time stamp only
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
300 ns max./300 ns max.
0.1 ms max./0.8 ms max.
300 ns max./300 ns max.
0.5 ms max./1.0 ms max.
300 ns max./300 ns max.
0.5 ms max./1.0 ms max.
0.1 ms max./0.8 ms max.
0.5 ms max./1.0 ms max.
0.1 ms max./0.8 ms max.
0.5 ms max./1.0 ms max.
Refer-
ence
P. A -4 0
P. A -4 4
P. A -4 6
P. A -4 8
P. A -5 0
P. A -5 2
P. A -5 4
P. A -5 6
P. A -5 8
P. A -6 0
1 - 12
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1 Features and System Configuration
Transistor Output Units (M3 Screw Terminal Block, 30 mm Width)
Num-
Model
NX-OD5121-1
NX-OD5256-1 PNP 24 VDC
ber of
points
16 points
Internal I/O
common
NPN
Maximum
value of
load cur-
rent
0.5 A/point, 5 A/Unit
Rated volt-
age
12 to 24 VDC
I/O refresh­ing method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
0.1 ms max./0.8 ms max.
0.5 ms max./1.0 ms max.
Refer-
P. A -6 2
P. A -6 4
Transistor Output Units (MIL Connector, 30 mm Width)
Num-
Model
NX-OD5121-5
NX-OD5256-5 PNP 24 VDC
NX-OD6121-5
NX-OD6256-5 PNP 24 VDC
ber of
points
16 points
32 points
Internal I/O
common
NPN
NPN
Maximum
value of
load cur-
rent
0.5 A/point, 2 A/Unit
0.5 A/point, 2 A/com­mon, 4 A/Unit
Rated volt-
age
12 to 24 VDC
12 to 24 VDC
I/O refresh­ing method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
0.1 ms max./0.8 ms max.
0.5 ms max./1.0 ms max.
0.1 ms max./0.8 ms max.
0.5 ms max./1.0 ms max.
Refer-
P. A -6 6
P. A -6 8
P. A -7 0
P. A -7 2
1-3 Model List
ence
1
1-3-3 Digital Output Units
ence
Transistor Output Units (Fujitsu Connector, 30 mm Width)
Num-
Model
NX-OD6121-6
NX-series Digital I/O Unit User’s Manual (W521)
ber of
points
32 points
Internal I/O
common
NPN
Maximum
value of
load cur-
rent
0.5 A/point, 2 A/com­mon, 4 A/Unit
Rated volt-
age
12 to 24 VDC
I/O refresh­ing method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
0.1 ms max./0.8 ms max.
Refer-
ence
P. A -7 4
1 - 13
Page 50
1 Features and System Configuration
Relay Output Units (Screwless Clamping Terminal Block, 12 mm Width)
Model
NX-OC2633
NX-OC2733
Num­ber of points
2 points
Relay type
N.O.
N.O. + N.C. P. A-78
Maximum switching
capacity
250 VAC/2 A (cosΦ = 1), 250 VAC/2 A (cosΦ = 0.4), 24 VDC/2 A, 4 A/Unit
I/O refresh­ing method
Free-Run refreshing
ON/OFF
response
time
15 ms max./15 ms max.
P. A -7 6
Relay Output Units (Screwless Clamping Terminal Block, 24 mm Width)
Model
NX-OC4633
Num­ber of points
8 points N.O.
Relay type
Maximum switching
capacity
250 VAC/2A (cosΦ = 1), 250 VAC/2A (cosΦ = 0.4), 24 VDC/2A, 8 A/Unit
I/O refresh­ing method
Free-Run refreshing
ON/OFF
response
time
15 ms max./15 ms max.
P. A -8 0
Refer-
ence
Refer-
ence
1 - 14
NX-series Digital I/O Unit User’s Manual (W521)
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1 Features and System Configuration
1-3-4 Digital Mixed I/O Units
This section shows the specifications for Digital Mixed I/O Units.
Refer to A-1-4 Digital Mixed I/O Units on page A-82 for details on the specifications of individual Mixed I/O Units.
DC Input/Transistor Output Units (MIL Connector, 30 mm Width)
Model
NX-MD6121-5
NX-MD6256-5
Num-
ber of
points
Out­puts: 16 points
Inputs: 16 points
Internal I/O
common
Outputs: NPN
Inputs: For both NPN/PNP
Outputs: PNP
Inputs: For both NPN/PNP
Maximum
value of
load cur-
rent
0.5 A/point, 2 A/Unit
Rated volt-
age
Outputs: 12 to 24 VDC
Inputs: 24 VDC
Outputs: 24 VDC
Inputs: 24 VDC
I/O refresh­ing method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
Outputs: 0.1 ms max./0.8 ms max.
Inputs: 20 μs max./400 μs max. Outputs: 0.5 ms max./1.0 ms max.
Inputs: 20 μs max./400 μs max.
1-3 Model List
1

1-3-4 Digital Mixed I/O Units

Refer-
ence
P. A -8 4
P. A -8 8
DC Input/Transistor Output Units (Fujitsu Connector, 30 mm Width)
Maximum
value of
load cur-
rent
0.5 A/point, 2 A/Unit
Rated volt-
age
Outputs: 12 to 24 VDC
Inputs: 24 VDC
I/O refresh­ing method
Switching Synchro­nous I/O refreshing and Free-Run refreshing
ON/OFF
response
time
Outputs: 0.1 ms max./0.8 ms max.
Inputs: 20 μs max./400 μs max.
Refer-
ence
P. A -9 2
Model
NX-MD6121-6
Num-
ber of
points
Out­puts: 16 points
Inputs: 16 points
Internal I/O
common
Outputs: NPN
Inputs: For both NPN/PNP
NX-series Digital I/O Unit User’s Manual (W521)
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Page 52
1 Features and System Configuration

1-4 List of Functions

This section provides an overview of functions that the Digital I/O Units have.
Refer to the specifications of each model in A-1 Data Sheet on page A-2 for details on the functions.

1-4-1 Digital Input Units

Function name Description Reference
Free-Run Refreshing With this I/O refreshing method, the refresh cycle of the NX
bus and the I/O refresh cycles of the NX Units are asynchro-
nous. Synchronous I/O Refresh­ing
Time Stamp Refreshing With this I/O refreshing method, the NX Units record the DC
Input refreshing with input changed time
Input Filter This function eliminates the chattering or the noises from input
With this I/O refreshing method, the timing to read inputs or to
refresh outputs is synchronized on a fixed interval between
more than one NX Unit connected to a CPU Unit.
In addition, with this I/O refreshing method, the timing to read
inputs or to refresh outputs is synchronized on a fixed interval
between more than one NX Unit on more than one Slave Ter-
minal.
times when inputs change or perform outputs at specified DC
times. These times are not synchronized to the NX bus refresh
cycles.
Data exchange between the NX Units and the CPU Unit and
data exchange between the NX Units and the EtherCAT Cou-
pler Unit are performed cyclically on the NX bus refresh
cycles.
With this I/O refreshing method, the Input Units record the DC
times when inputs changed.
signals.
It is used to prevent the error reading due to the noises. You
can set the filter time constant.
5-2-4 Free-Run Refreshing on
page 5-8
5-2-5 Synchro­nous Input Refreshing on
page 5-12
5-2-7 Time Stamp Refreshing on
page 5-19
5-2-8 Input Refreshing with Input Changed Time on page 5-20
6-4-2 Input Filter
on page 6-14
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1-4-2 Digital Output Units
Function name Description Reference
Free-Run Refreshing With this I/O refreshing method, the refresh cycle of the NX
bus and the I/O refresh cycles of the NX Units are asynchro­nous.
Synchronous I/O Refresh­ing
Time Stamp Refreshing With this I/O refreshing method, the NX Units record the DC
Output refreshing with specified time stamp
Load Rejection Output Setting
Load Short-circuit Protec­tion
With this I/O refreshing method, the timing to read inputs or to refresh outputs is synchronized on a fixed interval between more than one NX Unit connected to a CPU Unit.
In addition, with this I/O refreshing method, the timing to read inputs or to refresh outputs is synchronized on a fixed interval between more than one NX Unit on more than one Slave Ter­minal.
times when inputs change or perform outputs at specified DC times. These times are not synchronized to the NX bus refresh cycles.
Data exchange between the NX Units and the CPU Unit and data exchange between the NX Units and the EtherCAT Cou­pler Unit are performed cyclically on the NX bus refresh cycles. With this I/O refreshing method, the Output Units refresh out­puts at specified DC times.
A function that performs the preset output operation when the Digital Output Unit cannot receive output data due to an NX bus error or CPU Unit watchdog timer error, in the case of Units connected to a CPU Unit.
A function that performs the preset output operation when the Digital Output Unit cannot receive output data due to a host error on the Communications Coupler Unit or an error on the NX bus, in the case of Slave Terminals.
A function in which the output will turn OFF to protect the out­put circuit when an overload or load short-circuit occurs due to a failure of the connected external devices.
1 Features and System Configuration
5-2-4 Free-Run Refreshing on
page 5-8
5-2-6 Synchro­nous Output Refreshing on
page 5-16
5-2-7 Time Stamp Refreshing on
page 5-19
5-2-9 Output Refreshing with Specified Time Stamp on page
5-27
7-4-2 Load Rejec­tion Output Setting
on page 7-13
7-4-3 Load Short-circuit Pro­tection on page
7-17
1-4 List of Functions
1

1-4-2 Digital Output Units

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1 Features and System Configuration

1-4-3 Digital Mixed I/O Units

Function name Description Reference
Free-Run Refreshing With this I/O refreshing method, the refresh cycle of the NX
bus and the I/O refresh cycles of the NX Units are asynchro-
nous. Synchronous I/O Refresh-
ing
Input Filter This function eliminates the chattering or the noises from input
Load Rejection Output Setting
Load Short-circuit Protec­tion
With this I/O refreshing method, the timing to read inputs or to
refresh outputs is synchronized on a fixed interval between
more than one NX Unit connected to a CPU Unit.
In addition, with this I/O refreshing method, the timing to read
inputs or to refresh outputs is synchronized on a fixed interval
between more than one NX Unit on more than one Slave Ter-
minal.
signals.
It is used to prevent the error reading due to the noises. You
can set the filter time constant.
A function that performs the preset output operation when the
Digital Output Unit cannot receive output data due to an NX
bus error or CPU Unit watchdog timer error, in the case of
Units connected to a CPU Unit.
A function that performs the preset output operation when the
Digital Output Unit cannot receive output data due to a host
error on the Communications Coupler Unit or an error on the
NX bus, in the case of Slave Terminals.
A function in which the output will turn OFF to protect the out-
put circuit when an overload or load short-circuit occurs due to
a failure of the connected external devices.
5-2-4 Free-Run Refreshing on
page 5-8
5-2-5 Synchro­nous Input Refreshing on
page 5-12
6-4-2 Input Filter on page 6-14
7-4-2 Load Rejec­tion Output Setting
on page 7-13
7-4-3 Load Short-circuit Pro­tection on page
7-17
1 - 18
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1-5 Support Software
The Support Software that is used depends on the system configuration.
z Support Software for a System Configured with a CPU Unit
1 Features and System Configuration

1-5 Support Software

If your system is configured by connecting an NX Unit to a CPU Unit, the Sysmac Studio is used as the Support Software.
z Support Software for a System Configured with a Slave Terminal
If your system is configured by connecting an NX Unit to a Communications Coupler Unit, refer to the user’s manual for the Communications Coupler Unit for information on the Support Software.
Refer to A-7 Version Information with CPU Units on page A-158 or A-8 Version Information with Com- munications Coupler Units on page A-160 for information on the Support Software versions.
1
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1 Features and System Configuration
1 - 20
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Specifications
This section describes the general specifications and individual specifications of Digital I/O Units.
2-1 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2-2 Individual Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2
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2 Specifications

2-1 General Specifications

General specifications of Digital I/O Units are shown below.
Item Specification
Enclosure Grounding methods
Ambient operating tem­perature
Ambient operating humid­ity
Atmosphere Must be free from corrosive gases. Ambient storage tempera-
ture Altitude 2,000 m max. Pollution degree Pollution degree 2 or less: Conforms to JIS B 3502 and IEC 61131-2.
Operat­ing envi­ronment
Applicable standards
*1. Relay Output Unit specifications depend on the model. Refer to A-1 Data Sheet on page A-2 for details.
*2. Varies with NX Unit Models. Refer to A-1 Data Sheet on page A-2 for the specifications of individual NX Units.
*3. Refer to the OMRON website (www.ia.omron.com) or ask your OMRON representative for the most recent ap-
plicable standards for each model.
Noise immunity Conforms to IEC 61000-4-4, 2 kV (power supply line) Overvoltage category Category II: Conforms to JIS B 3502 and IEC 61131-2. EMC immunity level Zone B Vibration resistance
Shock resistance
Insulation resistance Dielectric strength
*3
*1
*1
Mounted in a panel Ground of 100 Ω or less
0 to 55°C
10 to 95% RH (with no icing or condensation)
-25 to 70°C (with no icing or condensation)
Conforms to IEC 60068-2-6. 5 to 8.4 Hz with amplitude of 3.5 mm,
8.4 to 150 Hz, acceleration of 9.8 m/s 100 min each in X, Y, and Z directions (10 sweeps of 10 min each = 100 min total)
Conforms to IEC 60068-2-27, 147 m/s2, 3 times each in X, Y, and Z directions
*2
*2
cULus: Listed (UL508) or Listed (UL 61010-2-201), ANSI/ISA 12.12.01, EU: EN 61131-2 or EN 61010-2-201, C-Tick, KC: KC Registration, NK, LR
2
2 - 2
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2 Specifications
2-2 Individual Specifications
Refer to A-1 Data Sheet on page A-2 for the specifications of individual Digital I/O Units.

2-2 Individual Specifications

2
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2 Specifications
2 - 4
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Part Names and Functions
This section describes the names and functions of the Digital I/O Unit parts.
3-1 Part Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-1-1 Screwless Clamping Terminal Block Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3-1-2 M3 Screw Terminal Block Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
3-1-3 Connector Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
3-2 Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13
3-2-1 TS Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3-2-2 IN/OUT Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
3
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3 Part Names and Functions

3-1 Part Names

This section describes the names and functions of the Digital I/O Unit parts.

3-1-1 Screwless Clamping Terminal Block Type

NX Units (12 mm Width)
(C)(D)
(B)
(A)
(H)
Let-
ter
(A) Marker attachment loca-
tions
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Terminal block The terminal block is used to connect external devices.
(H) Unit specifications The specifications of the Unit are given.
Name Function
(C)
(C)
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13
The number of terminals depends on the type of Unit.
(E)
(F)
(G)
(C)(E)
(B)
3 - 2
NX-series Digital I/O Unit User’s Manual (W521)
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NX Units (24 mm Width)
(B)
(A)
(C)(C) (E)
(D)
(B)
(H)
(G)
(F)
(C)(E)
(C)
3 Part Names and Functions
3-1 Part Names
3
3-1-1 Screwless Clamping Terminal Block Type
Let-
ter
(A) Marker attachment loca-
tions
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Terminal block The terminal block is used to connect external devices.
(H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13
The number of terminals depends on the type of Unit.
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3 Part Names and Functions
8-terminal type
12-terminal type
16-terminal type
(B)
(C)
(A)
A1
A2
A3
A4
A5
A6
A7
A8
B1
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
B1
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
B1
B2
B3
B4
B5
B6
B7
B8
Terminal Blocks
There are two models of screwless clamping terminal blocks: NX-TB2 and NX-TB1. Each model has three types of terminal blocks: 8-terminal type, 12-terminal type, and 16-terminal type.
z NX-TB2
(A)
A1
A2
A3
A4
A5
A6
A7
A8
8-terminal type
z NX-TB1
B1
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
12-terminal type
B1
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
16-terminal type
B1
B2
B3
B4
B5
B6
B7
B8
A1
A2
A3
A4
A5
A6
A7
A8
24 mm Width
8-terminal type ×2
D1
D2
D3
D4
D5
D6
D7
D8
(B)
(C)
3 - 4
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3 Part Names and Functions
Additional Information
Let-
ter
(A) Terminal number indi-
cations
(B) Release holes Insert a flat-blade screwdriver into these holes to connect and remove the
(C) Terminal holes The wires are inserted into these holes.
Name Function
Terminal numbers for which A and B indicate the column, and 1 to 8 indicate the line are displayed.
The terminal number is a combination of column and line, i.e. A1 to A8 and B1 to B8.
For models of 24 mm width, A1 to A8 and B1 to B8 are terminal number of the left terminal block, C1 to C8 and D1 to D8 are terminal numbers of the right terminal block.
The terminal number indications are the same regardless of the number of terminals on the terminal block.
wires.
The NX-TB2 and NX-TB1 Terminal Blocks have different terminal current capacities. The NX-TB2 has 10 A and NX-TB1 has 4 A.
To differentiate between the two models of terminal blocks, use the terminal number column indica­tions. The terminal block with white letters on a dark background is the NX-TB2.
You can mount either NX-TB1 or NX-TB2 Terminal Blocks to the Units that the current capacity specification of the terminals is 4 A or less.
You can only mount the NX-TB2 Terminal Block to the Units that the current capacity specifi­cation of the terminals is greater than 4 A.
3-1 Part Names
3
3-1-1 Screwless Clamping Terminal Block Type
• Each Digital I/O Unit is compatible with only one of three types of terminal blocks. You can­not use a terminal block with a number of terminals that differs from the specifications for a particular Unit.
• The 8-terminal type and 12-terminal type do not have terminal holes and release holes for following terminal numbers.
8-terminal type: A2, A4, A6, A8, B2, B4, B6, and B8
12-terminal type: A7, A8, B7, and B8
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3 Part Names and Functions
Precautions for Correct Use
z Applicable Terminal Blocks for Each Unit Model
The following indicates the terminal blocks that are applicable to each Unit.
Unit model number
NX-ID3 NX-TBA121 12 Not provided 4 A
NX-TBA122 10 A NX-ID4 NX-TBA161 16 4 A NX-ID5 NX-TBA162 10 A NX-IA3117 NX-TBA081 8 4 A NX-OD2 NX-TBA082 10 A NX-OD3268 NX-TBA162 16 10 A NX-OD3
(any model other than NX-OD3268)
NX-OD4 NX-TBA161 16 4 A NX-OD5 NX-TBA162 10 A NX-OC2 NX-TBA081 8 4 A
NX-OC4633 NX-TBA082 8 10 A
NX-TBA121 12 4 A
NX-TBA122 10 A
NX-TBA082 10 A
NX-TBB082
Model
Terminal block
Number of
terminals
Ground terminal
mark
Current capacity
You can mount either NX-TB1 or NX-TB2 Terminal Blocks to the Units that the cur­rent capacity specification of the terminals is 4 A or less.
However, even if you mount the NX-TB2 Terminal Block, the current specification does not change because the current capacity specification of the terminals on the Units is 4 A or less.
Refer to A-6 List of Screwless Clamping Terminal Block Models on page A-157 for information on the models of terminal blocks.
3 - 6
NX-series Digital I/O Unit User’s Manual (W521)
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3-1-2 M3 Screw Terminal Block Type
(C)
(D)
(J) (I)
(G)
(F)
(C)
(A)
(E)
(C) (B)
(C) (H)
(B)
(K)
(A)
NX Units (30 mm Width)
3 Part Names and Functions
3-1 Part Names
3

3-1-2 M3 Screw Terminal Block Type

Let-
ter
(A) Marker attachment loca-
tions
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Screw terminals These screw terminals are used to connect the wires. (H) Terminal block lever This lever is used to fix the terminal block on the NX Unit. (I) Unit specifications The specifications of the Unit are given. (J) Terminal block The terminal block is used to connect external devices. (K) Terminal block cover This cover is used to protect the screw terminals.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13
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3 Part Names and Functions
(C)
(E)
(C)
(C)
(D)
(H)
(G)
(F)
(C)
(A)
(E)
(B)
(B)

3-1-3 Connector Types

NX Units (30 mm Width)
z Units with MIL Connectors (1 Connector with 20 Terminals)
Let-
ter
(A) Marker attachment loca-
tion
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Connectors The connectors are used to connect to external devices. (H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4.
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13.
3 - 8
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3 Part Names and Functions
(C)
(E)
(C)
(C)
(D)
(H)
(G)
(F)
(C)
(A)
(E)
(B)
(B)
z Units with MIL Connectors (1 Connector with 40 Terminals)
3-1 Part Names
3
3-1-3 Connector Types
Let-
ter
(A) Marker attachment loca-
tion
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Connectors The connectors are used to connect to external devices. (H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4.
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13.
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3 Part Names and Functions
(C)
(E)
(C)
(C)
(D)
(H)
(G)
(F)
(C)
(A)
(E)
(B)
(B)
z Units with MIL Connectors (2 Connectors with 20 Terminals)
Let-
ter
(A) Marker attachment loca-
tion
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Connectors The connectors are used to connect to external devices. (H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4.
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13.
3 - 10
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3 Part Names and Functions
(C)
(E)(C)
(C)
(D)
(H)
(G)
(F)
(C)
(A)
(E)
(B)
(B)
z Units with Fujitsu Connectors (1 Connector with 40 Terminals)
3-1 Part Names
3
3-1-3 Connector Types
Let-
ter
(A) Marker attachment loca-
tion
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Connectors The connectors are used to connect to external devices. (H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4.
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13.
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3 Part Names and Functions
(C)
(E)
(C)
(C)
(D)
(H)
(G)
(F)
(C)
(A)
(E)
(B)
(B)
z Units with Fujitsu Connectors (2 Connectors with 24 Terminals)
Let-
ter
(A) Marker attachment loca-
tion
(B) NX bus connector This connector is used to connect each Unit. (C) Unit hookup guides These guides are used to connect two Units. (D) DIN Track mounting hooks These hooks are used to mount the NX Unit to a DIN Track. (E) Protrusions for removing
the Unit
(F) Indicators The indicators show the current operating status of the Unit.
(G) Connectors The connectors are used to connect to external devices. (H) Unit specifications The specifications of the Unit are given.
Name Function
The locations where markers are attached. The markers made by OMRON are installed for the factory setting. Commercially available markers can also be installed.
Refer to 4-1-2 Attaching Markers on page 4-4.
The protrusions to hold when removing the Unit.
Refer to 3-2 Indicators on page 3-13.
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3-2 Indicators
2-point type 4-point type
8-point type 16-point type
(A)
(B)
(A)
(B)
8-point type
There are the indicators to show the current operating status of the Unit or the signal I/O status on the Digital I/O Units.
The following indicator patterns are available depending on width of the Unit and the number of I/O points.
z NX Units (12 mm Width)
3 Part Names and Functions

3-2 Indicators

3
z NX Units (24 mm Width)
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3 Part Names and Functions
z NX Units (30 mm Width)
(A)
(B)
16-point type
16-point + 16-point type
(Mixed I/O Units)
Let-
ter
(A) Model number indications The model numbers of the NX Unit are displayed.
(B) Indicators The indicators show the current operating status of the NX Unit or the signal
Name Function
(Example) "ID3317" in the case of NX-ID3317
The NX Units are separated in the following color depending on the type of inputs and outputs.
• Digital Input Unit: Orange
• Digital Output Unit: Yellow
• Digital Mixed I/O Unit: White
I/O status.
32-point type
3 - 14
The following section describes the specifications of each indicator.
NX-series Digital I/O Unit User’s Manual (W521)
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3-2-1 TS Indicator
This indicator shows the current status of the Digital I/O Unit and its communications status with the CPU Unit or with the Communications Coupler Unit.
3 Part Names and Functions
3-2 Indicators
The meanings of light statuses are described as follows:
Color Status Description
Green Lit • The Unit is operating normally.
• The Unit is ready for I/O refreshing.
• I/O checking is operating.
Flashing at 2-s
intervals.
Red Lit A hardware failure, WDT error, or other fatal error that is common to
Flashing at 1-s
intervals.
--- Not lit • No Unit power supply
*1. Refer to the manual for the Communications Coupler Unit for the status of the indicator on the Communications
Coupler Units when I/O checking is in progress.
• Initializing
• Restarting is in progress for the Unit.
• Downloading
all I/O Units occurred.
A communications error or other NX bus-related error that is common to all I/O Units occurred.
• Restarting is in progress for the Unit.
• Waiting for initialization to start
*1
3

3-2-1 TS Indicator

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3 Part Names and Functions
This indicator shows the signal I/O status of each terminal of the Digital I/O Units.
For Digital Mixed I/O Units, the indicator shows as follows.
OUT indicator
IN indicator

3-2-2 IN/OUT Indicator

Color Status Description
Yellow Lit Digital I/O is ON
--- Not lit Digital I/O is OFF
3 - 16
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Installation and Wiring
This section describes how to install the NX Units, the types of power supplies provided to the NX Units and wiring methods, and how to wire the NX Units.
4-1 Installing NX Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-1-1 Installing NX Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
4-1-2 Attaching Markers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
4-1-3 Removing NX Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
4-1-4 Installation Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
4-2 Power Supply Types and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
4-2-1 Applications of I/O Power Supply and Supply Methods . . . . . . . . . . . . . . . . . . 4-9
4-2-2 Calculating the Total Current Consumption from I/O Power Supply . . . . . . . . .4-11
4-3 Wiring the Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
4-3-1 Wiring to the Screwless Clamping Terminal Block . . . . . . . . . . . . . . . . . . . . . 4-12
4-3-2 Wiring to M3 Screw Terminal Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-31
4-3-3 Wiring to MIL/Fujitsu Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35
4-3-4 Checking the Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
4-4 Wiring Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
4-4-1 Wiring the Input Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
4-4-2 Precautions when Wiring to the Output Units . . . . . . . . . . . . . . . . . . . . . . . . . 4-52
4
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4 Installation and Wiring
Precautions for Safe Use

4-1 Installing NX Units

This section describes how to install NX Units.
Refer to the user's manual for the CPU Unit or Communications Coupler Unit to which NX Units are connected for information on preparations of installation and installation in a control panel.

4-1-1 Installing NX Units

This section describes how to mount two NX Units to each other.
Always turn OFF the power supply before you mount NX Units.
Always mount NX Units one at a time. If you attempt to mount multiple NX Units that are already con­nected together, the connections between the NX Units may separate from each other and fall.
• Do not apply labels or tape on the NX Units. When the Unit is installed or removed, adhesive or scrap may adhere to the pins of the NX bus connector, which may cause 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.
NG NG
Example: NX Unit (12 mm width)
• Do not write on 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 malfunctions in the CPU Rack or the Slave Terminal. Refer to the user’s manual for the connected CPU Unit or Communications Coupler Unit for the restricted region of CPU Unit and Communications Coupler Unit.
Restricted
region (shaded
portion)
4 - 2
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4 Installation and Wiring
Precautions for Correct Use
Unit hookup guides
Unit hookup guides
• When you install an NX Unit, do not touch or bump the pins in the NX bus connector.
• When you handle an NX Unit, be careful not to apply any stress to the pins in the NX bus connector. If you install an NX Unit and turns ON the power supply when the pins in the NX bus connector are deformed, a contact defect may cause malfunctions.
1 From the front of the previously mounted NX Unit, engage the Unit hookup guides on a new Unit
with the Unit hookup guides on the previously mounted NX Unit.
4-1 Installing NX Units
2 Slide the NX Unit in on the hookup guides.
4
4-1-1 Installing NX Units
NX-series Digital I/O Unit User’s Manual (W521)
3 Press the NX Unit with a certain amount of force against the DIN Track until you hear the DIN
Track mounting hook lock into place.
When you mount the NX Unit, it is not necessary to release the DIN track mounting hook on the NX Unit.
After you mount the NX Unit, make sure that it is locked to the DIN Track.
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4 Installation and Wiring
Additional Information
A marker that is attached to the NX Unit
A marker that is attached to the terminal block
• Normally, it is not necessary to release the DIN track mounting hook when you mount the NX Unit. However, if you mount the NX Unit on a DIN Track that is not a recommended DIN Track, the DIN track mounting hook may not lock correctly. If that happens, first unlock the DIN track mounting hook, mount the NX Unit to the DIN Track, then lock the DIN track mount­ing hook.
• Refer to the user's manual for the CPU Unit to which NX Units can be connected for informa­tion on how to mount the CPU Unit, and how to mount NX Units to the CPU Unit.
• Refer to the user's manual for the Communications Coupler Unit for information on how to mount the Communications Coupler Unit, and how to mount the NX Unit to the Communica­tions Coupler Unit.

4-1-2 Attaching Markers

You can attach markers to the NX Units to identify them.
The plastic markers made by OMRON are installed for the factory setting. The ID information can be written on them.
Commercially available markers can also be installed.
Replace the markers made by OMRON if you use commercially available markers now.
The marker attachment locations vary depending on the type of the external connection terminals on the NX Units.
Screwless clamping terminal block NX Unit and terminal block M3 screw terminal block MIL connector NX Unit only Fujitsu connector
External connection terminals on NX Units Marker attachment location
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z Installation Method
Marker attachment location
Marker
Screwless clamping
terminal block
NX Unit
M3 screw
terminal block
Marker attachment location
Marker Marker
Terminal block cover
Marker attachment location
Insert the protrusions on the markers into the marker attachment locations.
4 Installation and Wiring
4-1 Installing NX Units
z Commercially Available Markers
Commercially available markers are made of plastic and can be printed on with a special printer.
To use commercially available markers, purchase the following products.
Product name
Markers UC1-TMF8 DEK 5/8 Special marker printer UM EN BLUEMARK X1 PrintJet PRO
Manufactured by Phoenix Contact Manufactured by Weidmuller
The markers made by OMRON cannot be printed on with commercially available special printers.
Model number
4
4-1-2 Attaching Markers
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4 Installation and Wiring
Precautions for Safe Use
Flat-blade screwdriver
DIN track mounting hook
Protrusion for removing the Unit
Protrusion for removing the Unit

4-1-3 Removing NX Units

Always turn OFF the Unit power supply and I/O power supply before you remove the NX Unit.
1 Use a flat-blade screwdriver to pull up the DIN Track mounting hook on the Unit to remove.
2 Put your fingers on the protrusions for removing multiple NX Units including the Unit to be
removed, then pull out straight forward to remove.
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4 Installation and Wiring
Precautions for Correct Use
• When removing an NX Unit, remove multiple Units together which include the one you want to remove. If you attempt to remove only one Unit, it is stuck and hard to pull out.
• Do not unlock the DIN track mounting hooks on all of the NX Units at the same time. If you unlock the DIN Track mounting hooks on all of the NX Units at the same time, all of the Units may come off.
4-1-4 Installation Orientation
The following explains the installation orientation for each NX Unit connection destination.
Installation Orientation in the Case of a CPU Unit
Orientation is possible only in the upright installation orientation.
Upper
Lower
4-1 Installing NX Units
4

4-1-4 Installation Orientation

However, there are restrictions on the specifications depending on the NX Units to be used.
Refer to the user's manuals for the NX Units and System Units that you will use for details on restric­tions.
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4 Installation and Wiring
Precautions for Safe Use
(A)
(B)
(E)
Upper
Lower
(C)
(F)
(D)
Installation Orientation in the Case of a Slave Terminal
Orientation is possible in the following six directions.
(A) is the upright orientation and (B) to (F) are other orientations.
However, there are restrictions on the installation orientation and restrictions to specifications that can result from the Communications Coupler Units and NX Units that are used.
Refer to the user's manuals for the Communications Coupler Units, NX Units and System Units that you will use for details on restrictions.
For installation orientations (C) and (D) in the above 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 Slave Terminal is no longer secured to the DIN Track, which may cause malfunctions.
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4 Installation and Wiring
4-2 Power Supply Types and Wiring
There are the following two types of power supplies that supply power to the NX Units.
Power supply name Description
NX Unit power supply This power supply is used for operating the NX Units. I/O power supply This power supply is used for driving the I/O circuits of the NX Units and for the con-
nected external devices.
The method for supplying power to the NX Units and the wiring method depend on the specifications for the CPU Unit to which NX Units are connected or the specifications for the Slave Terminal. Refer to Designing the Power Supply System or Wiring, which are described both in the hardware user’s manual for the CPU Unit to which NX Units are connected and user’s manual for the Communications Coupler Unit, for details on the method for supplying power to the NX Units and the wiring method.
The subsequent sections describe the applications of I/O power supply for the Digital I/O Units and sup­ply methods, and how to calculate the total current consumption from the I/O power supply.
4-2-1 Applications of I/O Power Supply and Supply Methods
The applications of I/O power supply and supply methods for the Digital I/O Units are given as follows:
Applications of I/O Power Supply

4-2 Power Supply Types and Wiring

4

4-2-1 Applications of I/O Power Supply and Supply Methods

The I/O power supply is used for the following applications.
• I/O circuits operations in the Digital I/O Units
• Input current in a Digital Input Unit
• Load current of the external load of a Digital Output Unit
• Power supply for the connected external devices
I/O Power Supply Method
This power is supplied by one of the following two methods. Refer to A-1 Data Sheet on page A-2 for the supply method of each NX Unit.
z Supply from the NX Bus
This power is supplied through the NX bus connectors by connecting an I/O power supply to the I/O power supply terminals on the Communications Coupler Unit or Additional I/O Power Supply Unit.
For the Units to which I/O power supply is provided by a CPU Rack, refer to Designing the Power Supply System or Wiring in the hardware user’s manual for the CPU Unit to which NX Units are con­nected.
For the Units to which I/O power supply is provided by a Slave Terminal, refer to Designing the Power Supply System or Wiring in the user's manual for the Communications Coupler Unit to be connected.
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4 Installation and Wiring
Additional Information
z Supply from External Source
This power is supplied to the Units from an external source.
I/O power is supplied by connecting an I/O power supply to the I/O power supply terminals on the Units.
Power Supply-related Units for the NX-series
The following three NX-series Units are related to power supply.
• Additional NX Unit Power Supply Unit
• Additional I/O Power Supply Unit
• I/O Power Supply Connection Unit
Refer to the NX-series System Unit User’s Manual (Cat. No. W523) for the specifications of these Units.
For a complete list of the latest power supply Units in the NX Series, refer to the product catalog or OMRON websites, or contact your OMRON representatives.
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4 Installation and Wiring
Precautions for Safe Use
4-2-2 Calculating the Total Current Consumption from I/O Power Sup-
ply
The total current consumption of I/O power supplied from the NX bus must be within the range of the maximum I/O power supply current of the Communications Coupler Unit or the Additional I/O Power Supply Unit. However, for a CPU Rack, the specification for the maximum I/O power supply current is restricted regardless of the model of the Additional I/O Power Supply Unit. Refer to the hardware user’s manual for the CPU Unit to which NX Units are connected for information on the restrictions for the CPU Rack.
To confirm this and to calculate the I/O power supply capacity, calculate the total current consumption from I/O power supply from the NX bus.
The total current consumption from I/O power supply from the NX bus is the total sum of current con­sumption from I/O power supply of the NX Unit that supplies the I/O power from the NX bus, the current consumption of each applicable I/O circuit, and current consumption of any connected external devices.
Note that the current consumption from I/O power supply indicated in the data sheet for each Unit type does not include the load current of any external connection load and current consumption of any con­nected external devices.
4-2 Power Supply Types and Wiring
4

4-2-2 Calculating the Total Current Consumption from I/O Power Supply

The total current consumption from I/O power supply of the Digital I/O Units is calculated as follows.
z Total Current Consumption from I/O Power Supply of the Digital Input Units
= (Current consumption from I/O power supply of the Digital Input Units) + (Input current of the Digi­tal Input Units × Number of input points used) + (Total current consumption of connected external devices)
z Total Current Consumption from I/O Power Supply of the Digital Output Units
= (Current consumption from I/O power supply of the Digital Output Units) + (Total load current of connection load) + (Total current consumption of connected external devices)
Refer to A-1 Data Sheet on page A-2 for the current consumption from I/O power supply for each Digital I/O Unit model and input current for each Digital Input Unit model.
There are no above confirmations if you use the NX Unit that supplies the I/O power from external source.
Use the total current consumption from I/O power supply from external source and the total current con­sumption from the I/O power supply from the above NX bus together to calculate the I/O power supply capacity.
Use the I/O power supply current for the CPU Rack of the NX-series NX1P2 CPU Unit at 4 A or less. Using the currents that are outside of the specifications may cause failure or damage.
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4 Installation and Wiring
WARNING
Caution

4-3 Wiring the Terminals

This section describes how to wire the terminals on the Digital I/O Units.
Make sure that the voltages and currents that are input to the Units and slaves are within the speci­fied ranges.
Inputting voltages or currents that are outside of the specified ranges may cause accidents or fire.
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.

4-3-1 Wiring to the Screwless Clamping Terminal Block

This section describes how to connect wires to the screwless clamping terminal block, the installation and removing methods, and functions for preventing incorrect attachment.
You can connect ferrules that are attached to the twisted wires to the screwless clamping terminal block. You can also connect the twisted wires or the solid wires to the screwless clamping terminal block. If you connect the ferrules, all you need to do to connect the wires is to insert the ferrules into the terminal holes.
Wiring Terminals
The terminals to be wired are as follows.
• I/O power supply terminals
• I/O terminals
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4 Installation and Wiring
1.6 mm max. (Terminals other than ground terminals)
2.0 mm max. (Ground terminals)
2.4 mm max. (Terminals other than ground terminals)
2.7 mm max. (Ground terminals)
Applicable Wires
The wires that you can connect to the screwless clamping terminal block are twisted wires, solid wires, and ferrules that are attached to the twisted wires. The following section describes the dimensions and processed methods for applicable wires.
z Dimensions of Wires Connected to the Terminal Block
The dimensions of wires that you can connect into the terminal holes of the screwless clamping ter­minal block are as in the figure below.
Process the applicable wires that are specified in the following description to apply the dimensions.
4-3 Wiring the Terminals
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
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4 Installation and Wiring
8 to 10 mm
2.4 mm max. (Terminals other than ground terminals)
2.7 mm max. (Ground terminals)
1.6 mm max. (Terminals other than ground terminals)
2.0 mm max. (Ground terminals)
z Using Ferrules
If you use ferrules, attach the twisted wires to them.
Observe the application instructions for your ferrules for the wire stripping length when attaching fer­rules.
Always use plated one-pin ferrules. Do not use unplated ferrules or two-pin ferrules.
The applicable ferrules, wires, and crimping tools are listed in the following table.
Ter min al
types
Terminals other than ground ter­minals
Ground ter­minals Terminals other than ground ter­minals
*1. Some AWG14 wires exceed 2.0 mm2 and cannot be used in the screwless clamping terminal block.
Manufac-
Phoenix Contact
Weidmuller H0.14/12 0.14 (#26) Weidmuller (The figure in parentheses is the appli-
turer
Applica-
Ferrule
model
AI0,34-8 0.34 (#22) Phoenix Contact (The figure in parentheses is the AI0,5-8 0.5 (#20) AI0,5-10 AI0,75-8 0.75 (#18) AI0,75-10 AI1,0-8 1.0 (#18) AI1,0-10 AI1,5-8 1.5 (#16) AI1,5-10 AI2,5-10
H0.25/12 0.25 (#24) H0.34/12 0.34 (#22) H0.5/14 0.5 (#20) H0.5/16 H0.75/14 0.75 (#18) H0.75/16 H1.0/14 1.0 (#18) H1.0/16 H1.5/14 1.5 (#16) H1.5/16
ble wire
(mm
(AWG))
*1
2.0
2
applicable wire size.)
CRIMPFOX 6 (0.25 to 6 mm
cable wire size.)
PZ6 Roto (0.14 to 6 mm
Crimping tool
2
, AWG24 to 10)
2
, AWG26 to 10)
When you use any ferrules other than those in the above table, crimp them to the twisted wires so that the following processed dimensions are achieved.
4 - 14
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4 Installation and Wiring
Precautions for Correct Use
Additional Information
Conductor length (stripping length)
Unravel wires Bend wires
NG
NG
z Using Twisted Wires/Solid Wires
If you use twisted wires or solid wires, use the following table to determine the correct wire specifica­tions.
Ter min als Wire type
*2
Wire size
2
mm
(AWG
28 to 16)
2.0 mm
2
Classifica-
tion
All terminals except ground terminals
Ground terminals
*1. Secure wires to the screwless clamping terminal block. Refer to Securing Wires on page 4-20 for how to
secure wires.
*2. With the NX-TB1 Terminal Block, use twisted wires to connect the ground terminal. Do not use a solid
wire.
Current
capacity
2 A max. Possible Possible Possible Possible 0.08 to 1.5 Greater
than 2 A and 4 A or less
Greater than 4 A
--- Possible Possible Possible
Twisted wir e s Solid wire
Plated Unplated Plated Unplated
Possible
*1
Not pos­sible
Possible
*1
Not pos­sible
*2
Not possi­ble
Possible
Conductor
length (strip-
ping length)
8 to 10 mm
9 to 10 mm
4-3 Wiring the Terminals
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
• Use cables with suitable wire sizes for the carrying current. There are also restrictions on the current due to the ambient temperature. Refer to the manuals for the cables and use the cables correctly for the operating environment.
• For twisted wires, strip the sheath and twist the conductor portion. Do not unravel or bend the conductor portion of twisted wires or solid wires.
If more than 2 A will flow on the wires, use plated wires or use ferrules.
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4 Installation and Wiring
Terminal hole
Release hole
2.5 mm0.4 mm
Front view
8 to 12
°
Side view
2.5-mm dia.
Connecting/Removing Wires
This section describes how to connect and remove wires.
z Terminal Block Parts and Names
z Required Tools
Use a flat-blade screwdriver to connect and remove wires.
Use the following flat-blade screwdriver.
Recommended screwdriver
Model Manufacturer
SZF 0-0,4×2,5 Phoenix Contact
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4 Installation and Wiring
1
10 to 15
°
Release hole Flat-blade screwdriver
z Connecting Ferrules
Insert the ferrule straight into the terminal hole.
It is not necessary to press a flat-blade screwdriver into the release hole.
Ferrule
After you make a connection, make sure that the ferrule is securely connected to the terminal block.
4-3 Wiring the Terminals
z Connecting Twisted Wires/Solid Wires
Use the following procedure to connect the twisted wires or solid wires to the terminal block.
1 Press a flat-blade screwdriver diagonally into the release hole.
Press at an angle of 10° to 15°.
If you press in the screwdriver correctly, you will feel the spring in the release hole.
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
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4 Installation and Wiring
2
Twisted wire/Solid wire
2 Leave the flat-blade screwdriver pressed into the release hole and insert the twisted wire or the
solid wire into the terminal hole.
Insert the twisted wire or the solid wire until the stripped portion is no longer visible to prevent shorting.
3 Remove the flat-blade screwdriver from the release hole.
3
After you make a connection, make sure that the twisted wire or the solid wire is securely connected to the terminal block.
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4 Installation and Wiring
Precautions for Safe Use
• Do not press the flat-blade screwdriver straight into the release hole. Doing so may break the terminal block.
NG
OK
• When you insert a flat-blade screwdriver into a release hole, press it down with a force of 30 N max. Applying excessive force may damage the terminal block.
• Do not tilt or twist the flat-blade screwdriver while it is pressed into the release hole. Doing so may break the terminal block.
NG
NG
• Make sure that all wiring is correct.
• Do not bend the cable forcibly. Doing so may sever the cable.
4-3 Wiring the Terminals
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
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4 Installation and Wiring
1.5 mm or less
4.0 mm or less
z Securing Wires
It is necessary to secure wires to the screwless clamping terminal block depending on the wire types that are used or the current flows on the wires.
The following table gives the necessity for securing wires.
Ter min als
Classifica-
tion
All terminals except ground terminals
Ground terminals
Twi s t ed wires Solid wire
Current
capacity
2 A max. No No No No No Greater than
2 A and 4 A or less Greater than 4 A
--- No No No No
Ferrule
Plated Unplated Plated Unplated
Yes Not Possible
Wire type
Not Possible Yes Not Possible
Use the following procedure to secure the wires.
1 Prepare a cable tie.
A cable tie can be used with a width of 4 mm or less and a thickness of 1.5 mm or less.
Select a cable tie correctly for the operating environment.
2 Pass a cable tie through the hole for securing wires on the bottom of the screwless clamping ter-
minal block.
Hole for securing wires
Cable tie
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4 Installation and Wiring
30 mm
3 Bundle the wires with a cable tie and secure them to the screwless clamping terminal block.
4-3 Wiring the Terminals
Secure wires within the range of 30 mm from the screwless clamping terminal block.
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
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4 Installation and Wiring
1
10 to 15
°
Flat-blade screwdriver
2
Wire
3
z Removing Wires
Use the following procedure to remove the wires from the terminal block.
The removal method is the same for ferrules, twisted wires, and solid wires.
If wires are secured firmly to the terminal block, release them first.
1 Press the flat-blade screwdriver diagonally into the release hole.
Press at an angle of 10° to 15°.
If you press in the screwdriver correctly, you will feel the spring in the release hole.
2 Leave the flat-blade screwdriver pressed into the release hole and pull out the wire.
3 Remove the flat-blade screwdriver from the release hole.
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NX-series Digital I/O Unit User’s Manual (W521)
Page 99
4 Installation and Wiring
Precautions for Safe Use
• Do not press the flat-blade screwdriver straight into the release hole. Doing so may break the terminal block.
NG
OK
• When you insert a flat-blade screwdriver into a release hole, press it down with a force of 30 N max. Applying excessive force may damage the terminal block.
• Do not tilt or twist the flat-blade screwdriver while it is pressed into the release hole. Doing so may break the terminal block.
NG
NG
• Make sure that all wiring is correct.
• Do not bend the cable forcibly. Doing so may sever the cable.
4-3 Wiring the Terminals
4
4-3-1 Wiring to the Screwless Clamping Terminal Block
NX-series Digital I/O Unit User’s Manual (W521)
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Page 100
4 Installation and Wiring
Removing a Terminal Block
1 Press the lock lever on the terminal block and pull out the top of the terminal block to remove it.
Lock lever
Terminal block
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NX-series Digital I/O Unit User’s Manual (W521)
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