Omron NX-PA Series User manual

Machine Automation Controller
NX-series
CPU Unit
Hardware
CPU Unit
Power Supply Unit
User’s Manual
W535-E1-11
NX701-1
NX-PA9001/PD7001

NOTE
1. 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.
2. 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 infor-
mation contained in this manual is subject to change without notice.
3. Every precaution has been taken in the preparation of this manual. Nevertheless, OMRON as-
sumes 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, Excel, and Visual Basic are either registered trademarks or trademarks of Mi-
crosoft Corporation in the United States and other countries.
•EtherCAT®is registered trademark and patented technology, licensed by Beckhoff Automation
GmbH, Germany.
•ODVA, CIP, CompoNet, DeviceNet, and EtherNet/IP are trademarks of ODVA.
•The SD and SDHC logos are trademarks of SD-3C, LLC.
Other company names and product names in this document are the trademarks or registered trade-
marks of their respective companies.
Copyrights
•Microsoft product screen shots used with permission from Microsoft.
•This product incorporates certain third party software. The license and copyright information associ-
ated with this software is available at http://www.fa.omron.co.jp/nj_info_e/.

1
Introduction
NX-series CPU Unit Hardware User’s Manual (W535)
Introduction
Thank you for purchasing an NX-series NX701 CPU Unit.
This manual contains information that is necessary to use the NX-series NX701 CPU Unit. Please read
this manual and make sure you understand the functionality and performance of the NX-series CPU
Unit before you attempt to use it in a control system.
In this manual, an NX-series NX701 CPU Unit is called an NX Series or NX-series CPU Unit.
Keep this manual in a safe place where it will be available for reference during operation.
This manual is intended for the following personnel, who must also have knowledge of electrical sys-
tems (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.
This manual covers the following products.
• NX-series CPU Units
NX701-17
NX701-16
Part of the specifications and restrictions for the CPU Units are given in other manuals. Refer to Rele-
vant Manuals on page 5 and Related Manuals on page 34.
Intended Audience
Applicable Products

CONTENTS
2NX-series CPU Unit Hardware User’s Manual (W535)
CONTENTS
Introduction ..............................................................................................................1
Intended Audience....................................................................................................................................... 1
Applicable Products..................................................................................................................................... 1
CONTENTS................................................................................................................2
Relevant Manuals .....................................................................................................5
Manual Structure ......................................................................................................7
Page Structure............................................................................................................................................. 7
Special Information...................................................................................................................................... 8
Precaution on Terminology .......................................................................................................................... 8
Terms and Conditions Agreement ........................................................................10
Warranty, Limitations of Liability ................................................................................................................ 10
Application Considerations ........................................................................................................................ 11
Disclaimers ................................................................................................................................................ 11
Safety Precautions .................................................................................................12
Definition of Precautionary Information...................................................................................................... 12
Symbols..................................................................................................................................................... 12
Warnings.................................................................................................................................................... 13
Cautions..................................................................................................................................................... 15
Precautions for Safe Use.......................................................................................16
Precautions for Correct Use.................................................................................. 25
Regulations and Standards...................................................................................29
Conformance to EU Directives .................................................................................................................. 29
Conformance to UL and CSA Standards ................................................................................................... 30
Conformance to KC Certification ............................................................................................................... 30
Conformance to Shipbuilding Standards ................................................................................................... 30
Software Licenses and Copyrights ............................................................................................................ 30
Versions ..................................................................................................................31
Checking Versions..................................................................................................................................... 31
Unit Versions of CPU Units and Sysmac Studio Versions ......................................................................... 33
Related Manuals .....................................................................................................34
Terminology ............................................................................................................ 37
Revision History .....................................................................................................42
Sections in this Manual .........................................................................................43
Section 1 Introduction to NX-series Controllers
1-1 The NX-series Controllers ....................................................................................................1-2
1-1-1 Features...................................................................................................................................... 1-2
1-1-2 Introduction to the System Configurations ..................................................................................1-5
1-2 Specifications ........................................................................................................................ 1-8
1-3 Overall Operating Procedure for the NX-series Controller.............................................. 1-13
1-3-1 Overall Procedure ..................................................................................................................... 1-13

3
CONTENTS
NX-series CPU Unit Hardware User’s Manual (W535)
1-3-2 Procedure Details ..................................................................................................................... 1-14
Section 2 System Configuration
2-1 Basic System Configuration................................................................................................. 2-2
2-1-1 EtherCAT Network Configuration................................................................................................ 2-3
2-2 Connecting to the Sysmac Studio ....................................................................................... 2-5
2-3 Network Configuration.......................................................................................................... 2-6
Section 3 Configuration Units
3-1 CPU Units ............................................................................................................................... 3-2
3-1-1 Models and Specifications .......................................................................................................... 3-2
3-1-2 Part Names and Functions ......................................................................................................... 3-2
3-2 SD Memory Cards................................................................................................................ 3-10
3-2-1 Models and Specifications ........................................................................................................ 3-10
3-2-2 Purpose .................................................................................................................................... 3-10
3-3 Power Supply Units............................................................................................................. 3-11
3-3-1 Models and Specifications .........................................................................................................3-11
3-3-2 Part Names and Functions ....................................................................................................... 3-12
3-4 Sysmac Studio..................................................................................................................... 3-15
3-4-1 Model Numbers ........................................................................................................................ 3-15
3-4-2 Connection................................................................................................................................ 3-15
Section 4 Installation and Wiring
4-1 Processing at Power ON and Power OFF ........................................................................... 4-2
4-1-1 Power ON Operation .................................................................................................................. 4-2
4-1-2 Power OFF Operation................................................................................................................. 4-3
4-1-3 Resetting the Controller from the Sysmac Studio....................................................................... 4-5
4-2 Fail-safe Circuits.................................................................................................................... 4-6
4-2-1 Order of Powering Up the Controller and Controlled System ..................................................... 4-7
4-3 Mounting Units ...................................................................................................................... 4-9
4-3-1 Installation in a Control Panel................................................................................................... 4-10
4-3-2 Preparations for Installation ...................................................................................................... 4-14
4-3-3 Installing the CPU Module ........................................................................................................ 4-16
4-3-4 Mounting the End Cover........................................................................................................... 4-20
4-3-5 Mounting the End Plates........................................................................................................... 4-21
4-3-6 Installing and Removing the SD Memory Card......................................................................... 4-23
4-3-7 Removing the CPU Module ...................................................................................................... 4-27
4-3-8 Assembled Appearance and Dimensions................................................................................. 4-29
4-4 Wiring ................................................................................................................................... 4-31
4-4-1 Power Supply Wiring ................................................................................................................ 4-31
4-4-2 Grounding................................................................................................................................. 4-35
4-4-3 Wiring the Built-in EtherCAT Port ............................................................................................. 4-39
4-4-4 Wiring the Built-in EtherNet/IP Port .......................................................................................... 4-39
4-5 Control Panel Installation ...................................................................................................4-40
4-5-1 Temperature.............................................................................................................................. 4-40
4-5-2 Humidity.................................................................................................................................... 4-42
4-5-3 Vibration and Shock.................................................................................................................. 4-42
4-5-4 Atmosphere .............................................................................................................................. 4-42
4-5-5 Electrical Environment .............................................................................................................. 4-43
4-5-6 Grounding................................................................................................................................. 4-47

CONTENTS
4NX-series CPU Unit Hardware User’s Manual (W535)
Section 5 Troubleshooting
5-1 Overview of Troubleshooting ............................................................................................... 5-2
Section 6 Inspection and Maintenance
6-1 Cleaning and Maintenance ................................................................................................... 6-2
6-1-1 Cleaning...................................................................................................................................... 6-2
6-1-2 Periodic Inspections.................................................................................................................... 6-2
6-1-3 Unit Replacement Precautions.................................................................................................... 6-5
6-2 Replacing the Battery............................................................................................................ 6-6
6-2-1 Battery Replacement................................................................................................................... 6-6
6-2-2 Operation without a Battery....................................................................................................... 6-10
6-3 Replacing the Fan Unit........................................................................................................ 6-11
6-3-1 Purpose of Attaching the Fan Unit ............................................................................................ 6-11
6-3-2 Fan Unit Replacement Period................................................................................................... 6-11
6-3-3 Fan Unit Used for Replacement................................................................................................ 6-11
6-3-4 Procedure of Fan Unit Replacement.........................................................................................6-12
Appendices
A-1 Specifications ........................................................................................................................A-2
A-2 Dimensions ............................................................................................................................A-3
A-2-1 NX-series CPU Units...................................................................................................................A-3
A-2-2 End Cover ...................................................................................................................................A-4
A-2-3 NX-series Power Supply Units ....................................................................................................A-4
A-2-4 SD Memory Card ........................................................................................................................A-5
A-3 Version Information...............................................................................................................A-6
Index

5
Relevant Manuals
NX-series CPU Unit Hardware User’s Manual (W535)
Relevant Manuals
The following table provides the relevant manuals for the NX-series CPU Units. Read all of the manuals
that are relevant to your system configuration and application before you use the NX-series CPU Unit.
Most operations are performed from the Sysmac Studio Automation Software. Refer to the Sysmac Stu-
dio Version 1 Operation Manual (Cat. No. W504) for information on the Sysmac Studio.
Purpose of use
Manual
Basic information
NX-series CPU Unit Hardware User’s Manual NJ/NX-series CPU Unit Software User’s Manual NJ/NX-series Instructions Reference Manual NJ/NX-series CPU Unit Motion Control User’s Manual NJ/NX-series Motion Control Instructions Reference Manual NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual NJ/NX-series CPU Unit OPC UA User’s Manual NX-series CPU Unit FINS Function User’s Manual NJ/NX-series Database Connection CPU Units User's Manual NJ/NX-series Troubleshooting Manual
Introduction to NX-series Controllers 
Setting devices and hardware

Using motion control 
Using EtherCAT 
Using EtherNet/IP 
Software settings

Using motion control 
Using EtherCAT 
Using EtherNet/IP 
Using OPC UA 
Using FINS 
Using the database connection service 
Writing the user program

Using motion control 
Using EtherCAT 
Using EtherNet/IP 
Using OPC UA 
Using FINS 
Using the database connection service 
Programming error processing 
Testing operation and debugging

Using motion control 
Using EtherCAT 
Using EtherNet/IP 
Using OPC UA 
Using FINS 
Using the database connection service 
Learning about error management and cor-
rections*1    

Relevant Manuals
6NX-series CPU Unit Hardware User’s Manual (W535)
Maintenance

Using motion control 
Using EtherCAT 
Using EtherNet/IP 
*1. Refer to the NJ/NX-series Troubleshooting Manual (Cat. No. W503) for the error management concepts and the error
items. However, refer to the manuals that are indicated with triangles () for details on errors corresponding to the prod-
ucts with the manuals that are indicated with triangles () .
Purpose of use
Manual
Basic information
NX-series CPU Unit Hardware User’s Manual NJ/NX-series CPU Unit Software User’s Manual NJ/NX-series Instructions Reference Manual NJ/NX-series CPU Unit Motion Control User’s Manual NJ/NX-series Motion Control Instructions Reference Manual NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual NJ/NX-series CPU Unit OPC UA User’s Manual NX-series CPU Unit FINS Function User’s Manual NJ/NX-series Database Connection CPU Units User's Manual NJ/NX-series Troubleshooting Manual

7
Manual Structure
NX-series CPU Unit Hardware User’s Manual (W535)
Manual Structure
The following page structure is used in this manual.
Note This illustration is provided only as a sample. It may not literally appear in this manual.
Page Structure
4-9
4 Installation and Wiring
NJ-series CPU Unit Hardware User’s Manual (W500)
stinUgnitnuoM3-4
4
stnenopmoCrellortnoCgnitcennoC1-3-4
4-3 Mounting Units
The Units that make up an NJ-series Controller can be connected simply by pressing the Units together
and locking the sliders by moving them toward the back of the Units. The End Cover is connected in the
same way to the Unit on the far right side of the Controller.
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
8NX-series CPU Unit Hardware User’s Manual (W535)
Special information in this manual is classified as follows:
Precautions for Safe Use
Precautions on what to do and what not to do to ensure safe usage of the product.
Precautions for Correct Use
Precautions on what to do and what not to do to ensure proper operation and performance.
Additional Information
Additional information to read as required.
This information is provided to increase understanding or make operation easier.
Version Information
Information on differences in specifications and functionality for CPU Units with different unit
versions and for different versions of the Sysmac Studio is given.
Note References are provided to more detailed or related information.
In this manual, “download” refers to transferring data from the Sysmac Studio to the physical Controller
and “upload” refers to transferring data from the physical Controller to the Sysmac Studio.
For the Sysmac Studio, synchronization is used to both upload and download data. Here, “synchronize”
means to automatically compare the data for the Sysmac Studio on the computer with the data in the
physical Controller and transfer the data in the direction that is specified by the user.
Special Information
Precaution on Terminology

9
Manual Structure
NX-series CPU Unit Hardware User’s Manual (W535)

Terms and Conditions Agreement
10 NX-series CPU Unit Hardware User’s Manual (W535)
Terms and Conditions Agreement
Exclusive Warranty
Omron’s exclusive warranty is that the Products will be free from defects in materials and workman-
ship for a period of twelve months from the date of sale by Omron (or such other period expressed in
writing by Omron). Omron disclaims all other warranties, express or implied.
Limitations
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF
THE PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based
on infringement by the Products or otherwise of any intellectual property right.
Buyer Remedy
Omron’s sole obligation hereunder shall be, at Omron’s election, to (i) replace (in the form originally
shipped with Buyer responsible for labor charges for removal or replacement thereof) the non-com-
plying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal
to the purchase price of the non-complying Product; provided that in no event shall Omron be
responsible for warranty, repair, indemnity or any other claims or expenses regarding the Products
unless Omron’s analysis confirms that the Products were properly handled, stored, installed and
maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of
any Products by Buyer must be approved in writing by Omron before shipment. Omron Companies
shall not be liable for the suitability or unsuitability or the results from the use of Products in combi-
nation with any electrical or electronic components, circuits, system assemblies or any other materi-
als or substances or environments. Any advice, recommendations or information given orally or in
writing, are not to be construed as an amendment or addition to the above warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CON-
SEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY
WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED IN CONTRACT,
WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on
which liability is asserted.
Warranty, Limitations of Liability
Warranties
Limitation on Liability; Etc

11
Terms and Conditions Agreement
NX-series CPU Unit Hardware User’s Manual (W535)
Omron Companies shall not be responsible for conformity with any standards, codes or regulations
which apply to the combination of the Product in the Buyer’s application or use of the Product. At
Buyer’s request, Omron will provide applicable third party certification documents identifying ratings
and limitations of use which apply to the Product. This information by itself is not sufficient for a com-
plete determination of the suitability of the Product in combination with the end product, machine, sys-
tem, or other application or use. Buyer shall be solely responsible for determining appropriateness of
the particular Product with respect to Buyer’s application, product or system. Buyer shall take applica-
tion responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
PROPERTY OR IN LARGE QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE
HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT(S) IS
PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIP-
MENT OR SYSTEM.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or
any consequence thereof.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for
the user in determining suitability and does not constitute a warranty. It may represent the result of
Omron’s test conditions, and the user must correlate it to actual application requirements. Actual perfor-
mance is subject to the Omron’s Warranty and Limitations of Liability.
Product specifications and accessories may be changed at any time based on improvements and other
reasons. It is our practice to change part numbers when published ratings or features are changed, or
when significant construction changes are made. However, some specifications of the Product may be
changed without any notice. When in doubt, special part numbers may be assigned to fix or establish
key specifications for your application. Please consult with your Omron’s representative at any time to
confirm actual specifications of purchased Product.
Information presented by Omron Companies has been checked and is believed to be accurate; how-
ever, no responsibility is assumed for clerical, typographical or proofreading errors or omissions.
Application Considerations
Suitability of Use
Programmable Products
Disclaimers
Performance Data
Change in Specifications
Errors and Omissions

Safety Precautions
12 NX-series CPU Unit Hardware User’s Manual (W535)
Safety Precautions
The following notation is used in this manual to provide precautions required to ensure safe usage of an
NX-series Controller. The safety precautions that are provided are extremely important to safety.
Always read and heed the information provided in all safety precautions.
The following notation is used.
Definition of Precautionary Information
WARNING
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury. Additionally, there may be
severe property damage.
Caution Indicates a potentially hazardous situation which, if not avoided,
may result in minor or moderate injury, or property damage.
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.
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 high temperatures.

13
Safety Precautions
NX-series CPU Unit Hardware User’s Manual (W535)
Warnings
WARNING
During Power Supply
Do not touch any of the terminals or terminal blocks while the power is being
supplied.
Doing so may result in electric shock.
Do not attempt to take any Unit apart.
In particular, high-voltage parts are present in the Power Supply Unit 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, slaves, or Units 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 Controller outputs may remain ON or OFF due to deposition or burning
of the output relays or destruction of the output transistors. As a countermea-
sure for such problems, external safety measures must be provided to
ensure safe operation of the system.
The CPU Unit will turn OFF all outputs from Digital Output Units in the follow-
ing cases. The slaves will operate according to the settings in the slaves.
• If an error occurs in the power supply
• If a CPU error or CPU reset occurs
• If a major fault level Controller error occurs
• While the CPU Unit is on standby until RUN mode is entered after the
power is turned ON
• If a system initialization error occurs
External safety measures must be provided to ensure safe operation of the
system in such cases.
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 controls
with monitoring of external power supply voltage as required so that the sys-
tem operates safely in such a case.

Safety Precautions
14 NX-series CPU Unit Hardware User’s Manual (W535)
Unintended outputs may be performed when an error occurs in variable
memory or memory for CJ-series Units. As a countermeasure for such prob-
lems, external safety measures must be provided to ensure safe operation of
the system.
Provide measures in the communications system and user program to
ensure safety in the overall system even if errors or malfunctions occur in
data link communications or remote I/O communications.
If there is interference in remote I/O communications or if a major fault level
error occurs, output status will depend on the products that are used.
Confirm the operation that will occur when there is interference in communi-
cations or a major fault level error, and implement safety measures.
Correctly set all of the settings in the slaves and Units.
The NX-series Controller continues normal operation for a certain period of
time when a momentary power interruption occurs. This means that the
NX-series Controller may receive incorrect signals from external devices that
are also affected by the power interruption. Accordingly, take suitable
actions, such as external fail-safe measures and interlock conditions, to
monitor the power supply voltage of the external device as required.
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 acci-
dents due to incorrect operation.
Voltage and Current Inputs
Make sure that the voltages and currents that are input to the slaves and
Units are within the specified ranges.
Inputting voltages or currents that are outside of the specified ranges may
cause accidents or fire.
Downloading
Always confirm safety at the destination before you transfer a user program,
configuration data, setup data, device variables, or values in memory used
for CJ-series Units from the Sysmac Studio.
The devices or machines may perform unexpected operation regardless of
the operating mode of the CPU Unit.
Actual Operation
Check the user program, data, and parameter settings for proper execution
before you use them for actual operation.

15
Safety Precautions
NX-series CPU Unit Hardware User’s Manual (W535)
Cautions
Caution
Application
Do not touch any Unit when power is being supplied or immediately after the
power supply is turned OFF. Doing so may result in burn injury.
Wiring
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.
When you connect a computer or other peripheral device to a Controller that
has a non-isolated DC Power Supply Unit, either ground the 0-V side of the
external power supply or do not ground it at all.
If the peripheral devices are grounded incorrectly, the external power supply
may be short-circuited. Never ground the 24-V side of the power supply, as
shown in the following figure.
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.
Peripheral device
(e.g., computer)
Non-isolated DC power supply
(internal power supply circuit)
0 V
Peripheral
device cable
External
power supply
24 V

Precautions for Safe Use
16 NX-series CPU Unit Hardware User’s Manual (W535)
Precautions for Safe Use
• Do not attempt to disassemble, repair, or modify any Units. Doing so may result in malfunction or fire.
• Do not drop any Unit or subject it to abnormal vibration or shock. Doing so may result in Unit malfunc-
tion or burning.
• The sliders on the tops and bottoms of the Power Supply Unit and CPU Unit must be completely
locked (until they click into place) after connecting the adjacent Unit connectors.
• 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.
• Do not write on the CPU 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 connector, which may result in malfunctions.
Disassembly and Dropping
Mounting
NG
PORT1 EtherNet/IP
PORT1 EtherNet/IP
PORT2 EtherNet/IP
PORT2 EtherNet/IP
PORT3 EtherCAT
PORT3 EtherCAT
Restricted region
(shaded portion)

17
Precautions for Safe Use
NX-series CPU Unit Hardware User’s Manual (W535)
• Always connect to a ground of 100 Ωor less when installing the Units.
• If the LG and GR terminals are connected, make sure to connect them firmly. The LG terminal that is
a noise-filtered neutral terminal, has a half electrical potential of the input voltage. Therefore, if you
touch the metallic part of the LG terminal, GR terminal, or Controller, while the GR terminal is not
grounded, it may result in electrical shock even when a normal operation is performed.
• Follow the instructions in this manual to correctly perform wiring.
Double-check all wiring and switch settings before turning ON the power supply.
• Use crimp terminals for wiring.
Do not connect bare stranded wires directly to terminals.
• Do not pull on the cables or bend the cables beyond their natural limit.
Do not place heavy objects on top of the cables or other wiring lines. Doing so may break the cables.
• 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.
• Before you connect a computer to the CPU Unit, disconnect the power supply plug of the computer
from the AC outlet. Also, if the computer has an FG terminal, make the connections so that the FG
terminal has the same electrical potential as the GR terminal on the Power Supply Unit. A difference
in electrical potential between the computer and Controller may cause failure or malfunction.
• If the external power supply to an Output Unit or slave has polarity, connect it with the correct polarity.
If the polarity is reversed, current may flow in the reverse direction and damage the connected
devices regardless of the operation of the Controller.
• Do not exceed the rated supply capacity of the Power Supply Units in the NX-series Controller. The
rated supply capacities are given in the NX-series CPU Unit Hardware User’s Manual (Cat. No.
W535).
If the capacity is exceeded, operation may stop, malfunctions may occur, or data may not be backed
up normally for power interruptions.
• Do not apply voltages or connect loads to the Output Units or slaves in excess of the maximum rat-
ings.
• Surge current occurs when the power supply is turned ON. When selecting fuses or breakers for
external circuits, consider the above precaution and allow sufficient margin in shut-off performance.
Refer to the relevant manuals for surge current specifications. Refer to the NX-series CPU Unit Hard-
ware User’s Manual (Cat. No. W535) for surge current specifications.
• If the full dielectric strength voltage is applied or turned OFF using the switch on the tester, the gener-
ated impulse voltage may damage the Power Supply Unit. Use the adjustment on the tester to grad-
ually increase and decrease the voltage.
• Apply the voltage between the Power Supply Unit’s L1 or L2 terminal and the GR terminal when test-
ing insulation and dielectric strength.
• Do not supply AC power from an inverter or other device with a square-wave output. Internal tem-
perature rise may result in smoking or burning. Always input a sinusoidal wave with the frequency
that is given in the NX-series CPU Unit Hardware User’s Manual (Cat. No. W535).
• Install external breakers and take other safety measures against short-circuiting in external wiring.
Installation
Wiring
Power Supply Design

Precautions for Safe Use
18 NX-series CPU Unit Hardware User’s Manual (W535)
• It takes up to approximately 10 to 20 s to enter RUN mode after the power is turned ON. The outputs
during this time behave according to the slave or Unit specifications. Use the RUN output on the
Power Supply Unit, for example, to implement fail-safe circuits so that external devices do not oper-
ate incorrectly.
• Configure the external circuits so that the power supply to the control system turns ON only after the
power supply to the Controller has turned ON. If the power supply to the Controller is turned ON after
the control power supply, temporary errors may result in incorrect control system signals because the
output terminals on Output Units may momentarily turn ON when power supply is turned ON to the
Controller.
• If you transfer data from a backup file on an SD Memory Card to the Controller when the power sup-
ply is turned ON, properly select the data groups to transfer. If the data for an unintended data group
is transferred to the Controller, it may cause the equipment to operate unpredictably.
• Never turn OFF the power supply to the Controller when the BUSY indicator is flashing. While the
BUSY indicator is lit, the user program and settings in the CPU Unit are being backed up in the
built-in non-volatile memory. This data will not be backed up correctly if the power supply is turned
OFF. Also, a major fault level Controller error will occur the next time you start operation, and opera-
tion will stop.
• Do not turn OFF the power supply or remove the SD Memory Card while SD Memory Card access is
in progress (i.e., while the SD BUSY indicator flashes). Data may become corrupted, and the Control-
ler will not operate correctly if it uses corrupted data. To remove the SD Memory Card from the CPU
Unit while the power supply is ON, press the SD Memory Card power supply switch and wait for the
SD BUSY indicator to turn OFF before you remove the SD Memory Card.
• Do not disconnect the cable or turn OFF the power supply to the Controller when downloading data
or the user program from Support Software.
• Always turn OFF the power supply to the Controller before you attempt any of the following.
a) Mounting or removing the Units
b) Assembling the Units
c) Setting DIP switches or rotary switches
d) Connecting cables or wiring the system
e) Connecting or disconnecting the connectors
f) Mounting or removing the Fan Unit
The Power Supply Unit may continue to supply power to the rest of the Controller for a few seconds
after the power supply turns OFF. The PWR indicator is lit during this time. Confirm that the PWR
indicator is not lit before you perform any of the above.
• If the following variables are specified for a condition expression when the execution condition is a
condition expression for a variable, event tasks may not be executed when conditions are met or
event tasks may be executed when conditions are not met.
a) Structure members whose data size is 16 bits or more, except for system-defined variables for
motion control
b) Array elements whose data size is 16 bits or more
For information on event task execution conditions, refer to the NJ/NX-series CPU Unit Software
User’s Manual (Cat. No. W501).
Turning ON the Power Supply
Turning OFF the Power Supply
Task Design