Omron NT20 User Manual

Cat. No. V091-E1-01

NT20

Programmable Terminal

USER’S MANUAL

NT-series Programmable Terminal

User’s Manual

Produced March 2007

Notice:

r f

OMRON products are manufactured for use according to proper procedures by a qualified operator and only for the purposes described in this manual.

The following conventions are used to indicate and classify precautions in this manual. Always heed the information provided with them. Failure to heed precautions can result in injury to people or damage to property.

!DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or

serious injury. Additionally, there may be severe property damage.

!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.

OMRON Product References

All OMRON products are capitalized in this manual. The word “Unit” is also capitalized when it refers to an OMRON product, regardless of whether or not it appears in the proper name of the product.

The abbreviation “Ch,” which appears in some displays and on some OMRON products, often means “word” and is abbreviated “Wd” in documentation in this sense.

The abbreviation “PLC” means Programmable Controller. “PC” is used, however, in some Programming Device displays to mean Programmable Controller.

The abbreviation “Host” means a PLC that controls the NT20.

Visual Aids

The following headings appear in the left column of the manual to help you locate different types of information.

 OMRON, 2007

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form, o by any means, mechanical, electronic, photocopying, recording, or otherwise, without the prior written permission o 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.

Note Indicates information of particular interest for efficient and convenient opera-

tion of the product.

1,2,3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.

PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xvii

1 Intended Audience. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

2 General Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

3 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

5 Application Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .xix

6 EC Directives. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

SECTION 1

Functions of the NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-1 Role and Operation of NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-2 Functions of NT20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1-3 Method for Connection to the Host . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1-4 Communications with PLC by Direct Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1-5 Communications Using RS-232C (NT20-ST128) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

1-6 Before Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

SECTION 2

Hardware Settings and Connections. . . . . . . . . . . . . . . . . . . 17

2-1 Description of Parts and Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2-2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

2-3 Connecting Link Adapters and RS-422A Converters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2-4 Connecting the NT Support Tool. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

2-5 Using a Memory Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

2-6 Connecting to the RS-232C Port at the Host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

2-7 Communicating with the PLC Using C200H Direct Communications. . . . . . . . . . . . . . . . . 73

2-8 Host Connections by RS-232C (NT20-ST128). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

SECTION 3

System Menu Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

3-1 Operation Flow by the System Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

3-2 Starting the NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

3-3 Operation Modes and the System Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

3-4 Initializing Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

3-5 Setting the Conditions of Communications with the Host by Using the Memory Switches. 91

3-6 Registering the Screen Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102

3-7 Starting the Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

3-8 Various System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

3-9 System Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

3-10 Transferring the System Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

3-11 Transferring the Resource Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

vii

TABLE OF CONTENTS

SECTION 4

NT20 Functions and Operation . . . . . . . . . . . . . . . . . . . . . . . 133

4-1 Screen Creation Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134

4-2 Outline of Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

4-3 Screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140

4-4 Memory Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

4-5 Bar Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

4-6 Lamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

4-7 Touch Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

4-8 Numeral Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

SECTION 5

How to Use the Host Link/NT Link . . . . . . . . . . . . . . . . . . . 165

5-1 Overview of Direct Connection Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

5-2 Memory Tables and Bar Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

5-3 Lamps, Touch Switches, Numeral Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

5-4 NT20 Status Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

5-5 Notification of the Operating Status to the PLC

(Determining the NT20 Operating Status) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

SECTION 6

Using RS-232C Communications . . . . . . . . . . . . . . . . . . . . . 211

6-1 Table of Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

6-2 RS-232C Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

6-3 Screen Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

6-4 Memory Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218

6-5 Lamps, Touch Switches, Numeral Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

6-6 Controlling the NT20 Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

6-7 Terminal Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

6-8 Key to Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

SECTION 7

Troubleshooting and Maintenance . . . . . . . . . . . . . . . . . . . . 247

7-1 Hardware Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

7-2 Responding to Displayed Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

7-3 Maintenance of the NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .253

7-4 Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

Appendices

A Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255

B Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261

C Transporting and Storing PTs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263

viii

TABLE OF CONTENTS

D Making the Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

E Making the Cable for Connecting a Personal Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

F Model List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

G Option List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

H Special Characters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

I Function Restrictions Depending on the Support Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287

TABLE OF CONTENTS

About this Manual:

This manual describes the basic functions and operation procedures of the NT-series programmable terminal NT20, its operations when connected to a PLC or a Host, and includes the sections described below.

Please read this manual carefully and be sure you understand the information provided before attempting to install and operate the NT-series programmable terminal NT20.

!WARNING Failure to read and understand the information provided in this manual may result in

personal injury or death, damage to the product, or product failure. Please read each section in its entirety and be sure you understand the information provided in the section and related sections before attempting any of the procedures or operations given.

Precautions provides general precautions for using the NT20 and related devices. Section 1 describes the operation functions, system configuration, and the direct connection function

of the NT20. Section 2 describes the NT20 hardware settings, its installation in an operation panel, its connection

to the Host, etc. Section 3 describes the procedure before operating the NT20, and useful functions when operating it.

Also describes how to perform an operation check.

Section 4 describes the functions of the NT20 when it is connected to a Host. Section 5 describes how to operate the NT20 when the host link/NT link is used for communications. Section 6 describes how to operate the NT20 when the RS-232C interface is used for communica-

tions. Read this section only when using the NT20-ST128. Section 7 describes the procedures to follow when the system does not operate correctly, and the pro-

cedure for routine maintenance of the NT20. APPENDIX describes the specifications and the method for making connecting cables, and includes

an area list for the PLC.

!WARNING Failure to read and understand the information provided in this manual may result in per-

sonal injury or death, damage to the product, or product failure. Please read each section in its entirety and be sure you understand the information provided in the section and related sections before attempting any of the procedures or operations given.

WARRANTY

OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if specified) from date of sale by OMRON.

OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NONINFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.

LIMITATIONS OF LIABILITY

OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR STRICT LIABILITY.

In no event shall the responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.

IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS 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 OR REPAIR.

xiii

Application Considerations

SUITABILITY FOR USE

OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's application or use of the products.

At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product, machine, system, or other application or use.

The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:

• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this manual.

• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety equipment, and installations subject to separate industry or government regulations.

• Systems, machines, and equipment that could present a risk to life or property.

Please know and observe all prohibitions of use applicable to the products.

NEVER USE THE PRODUCTS 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 PRODUCTS ARE PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.

PROGRAMMABLE PRODUCTS

OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.

xiv

Disclaimers

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 model numbers when published ratings or features are changed, or when significant construction changes are made. However, some specifications of the products may be changed without any notice. When in doubt, special model numbers may be assigned to fix or establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual specifications of purchased products.

DIMENSIONS AND WEIGHTS

Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.

PERFORMANCE DATA

Performance data given in this manual 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 users must correlate it to actual application requirements. Actual performance is subject to the OMRON Warranty and Limitations of Liability.

ERRORS AND OMISSIONS

The information in this manual has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical, typographical, or proofreading errors, or omissions.

xvi

PRECAUTIONS

This section provides general precautions for using the Programmable Terminal.

The information contained in this section is important for the safe and reliable application of the Programmable Terminal. You must read this section and understand the information contained before attempting to set up or operate a Programmable Terminal.

1 Intended Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

2 General Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

3 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xviii

4 Operating Environment Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

5 Application Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xix

6 EC Directives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xx

xvii

Intended Audience 1

1 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 into production facilities.

• Personnel in charge of installing FA systems.

• Personnel in charge of designing and connecting FA systems.

• Personnel in charge of managing FA systems and facilities.

2 General Precautions

• The user must operate the product according to the performance specifications described in the operation manuals.

• Before using the product under conditions which are not described in the manual or applying the product to nuclear control systems, railroad systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, safety equipment, and other systems, machines, and equipment that may have a serious influence on lives and property if used improperly, consult your OMRON representative.

• Make sure that the ratings and performance characteristics of the product are sufficient for the systems, machines, and equipment, and be sure to provide the systems, machines, and equipment with double safety mechanisms.

• This manual provides information for using the Programmable Terminal. Be sure to read this manual before attempting to use the software and keep this manual close at hand for reference during operation.

!WARNING It is extremely important that Programmable Terminals and related devices be

used for the specified purpose and under the specified conditions, especially in applications that can directly or indirectly affect human life. You must consult with your OMRON representative before applying Programmable Terminals to the abovementioned applications.

!WARNING Do not use the input functions of the PT, such as touch switches or function

keys, for applications where danger to human life or serious property damage is possible or for emergency switch applications.

3 Safety Precautions

Read these safety precautions carefully and make sure you understand them before using the Programmable Terminal so that you can use it safely and correctly.

!WARNING Do not attempt to take the PLC apart and do not touch any internal parts while

the power is being supplied. Doing either of these may result in electrical shock.

!Caution Carefully check the wiring before turning ON the power.

!Caution Do not connect AC power to the DC terminals. Incorrect wiring may result in

burning.

xviii

Operating Environment Precautions 4

!Caution If the DIP switch settings have been changed when the NT20 is powered,

reset the power to the NT20. The changes with the DIP switches become effective only after the power supply is reset.

4 Operating Environment Precautions

1,2,3... 1. Do not install the PT in any of the following locations.

• Locations subject to rapid changes in temperature

• Locations subject to temperatures or humidity outside the range specified in the specifications

• Locations subject to condensation as the result of high humidity

• Locations subject to splashing chemicals or solvents

• Locations subject to oil splashes

• Locations subject to corrosive or flammable gases

• Locations subject to strong shock or vibration

• Locations outdoors subject to direct wind and rain

• Locations subject to strong ultraviolet light

2. Take appropriate and sufficient countermeasures when installing systems in the following locations.

• Locations subject to static electricity or other forms of noise

• Locations subject to strong electromagnetic or magnetic fields

• Locations close to power supply lines

• Locations subject to possible exposure to radioactivity

5 Application Precautions

1,2,3... 1. When unpacking the PT, check carefully for any external scratches or other

damage. Also, shake the PT gently and check for any abnormal sound.

2. Turn OFF the power supply to the PT before mounting or dismounting any Interface Unit, such as a Memory Unit. Correctly mount the Interface Unit according to the NT20 User's Manual.

3. Do not touch PCBs with bare hands. Discharge static electricity accumulated in your body in advance.

4. The mounting panel must be between 1.6 and 4.8 mm thick. Tighten the Mounting Brackets evenly to a torque of between 0.5 and 0.6 N·m to maintain water and dust resistance. Make sure the panel is not dirty or warped and that it is strong enough to hold the PT.

5. Do not let metal particles enter the PT when preparing the panel.

6. Do not perform a dielectric voltage test on the PT.

7. Use a DC power supply that is isolated between DC output and AC input, and has minimal fluctuation voltage. Rated power supply voltage: 24 VDC (Allowable range: 20.4 to 27.6 VDC) Capacity: 10 W min.

8. Use a twisted-pair cable of at least 2 mm terminals. Tighten the terminal screws to 0.8 N·m. Make sure the screws are properly tightened.

9. Turn OFF the power supply to the PT before connecting or disconnecting cables between devices.

to connect to the power supply

xix

EC Directives 6

10. Always tighten the connector screws after connecting communications cables.

11. The maximum pull load for cables is 30 N. Do not apply loads greater than this.

12. Confirm that the current capacity of the connected device is 150 mA or less before using the 5-V power supply from pin 6 of serial port A or port B. The 5-V output of the NT20 is 150 mA maximum at 5 V

13. Confirm the safety of the system before turning ON or OFF the power supply or pressing the reset switch.

14. The whole system may stop depending on how the power supply is turned ON or OFF. Turn ON or OFF the power supply according to the specified procedure.

15. Start actual system application only after sufficiently checking screen data and the operation of the program in the PLC (host).

16. Do not press any touch switch with a force greater than 30 N.

17. Do not accidentally press touch switches when the Backlight is not lit or when the display does not appear. Confirm the safety of the system before pressing touch switches.

18. Signals from the touch switches may not be input if the switches are pressed consecutively at high speed. Confirm each input before proceeding to the next touch switch.

19. To ensure greater safety for numeric inputs, use the upper/lower limit setting function.

20. When transferring data in screen units, also transfer any data associated with the screen, such as memory tables or direct connection data, if any of this data has changed.

21. To assure system safety, incorporate a program that periodically calls PT operation bits from the host side to check that the PT is properly operating.

22. An afterimage will remain if the same patterns are displayed continuously for extended periods of time (e.g., 24 hours). Use the screen saver or periodically change the display to prevent afterimages.

23. Do not use benzene, paint thinner, or other volatile solvents, and do not use chemically treated cloths.

24. Do not attempt to disassemble, repair, or modify the PT in any way.

25. The backlight in the PT contains mercury. Do not dispose of the PT together with waste to be processed at disposal plants. Dispose of the PT according to all local laws, regulations, and ordinances as they apply.

26. Confirm the installation conditions periodically when the PT is being used in an environment subject to oil or water.

27. Water resistance will be lost if the front sheet is not present. Confirm that the front sheet is present before using the PT.

±5%.

6 EC Directives

Conforming Directive

The NT20 PTs conform to the EMC Directive.

EC Directives 6

EMC Directive Conformance

OMRON products are designed as electrical devices for use built into other devices or the overall machine. As individual devices, they comply with the related EMC standards (see note) so that they can more easily be built into other devices or the overall machine. The actual products have been checked for conformity to EMC standards. Whether they 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 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.

Note 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)

Complying with EC Directives

NT-series PTs comply with EC Directives. Observe the following precautions to ensure that the customer’s device and the overall machine also comply with EC Directives.

1,2,3... 1. The PT is designed for installation inside a control panel. The PT must be

installed within a control panel.

2. Use reinforced insulation or double insulation for the DC power supply to the PT. Ensure that a stable power output can be provided even if a 10-ms interruption occurs at the input.

3. The PT conforms to the EN 61131-2, but the 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 complies with EC Directives.

xxi

EC Directives 6

xxii

SECTION 1

Functions of the NT20

NT20 is a new programmable terminal (PT) which incorporates a host interface unit and two RS-232C interface units in a programmable terminal body. It can be easily installed and used. This section gives the operation examples and characteristics of the NT20 so that you will understand the applications of the NT20.

1-1 Role and Operation of NT20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

1-1-1 Operations of NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1-2 Functions of NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1-2-1 Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1-2-2 Principal Functions of NT20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1-2-3 Comparison between NT20S, NT20M, and NT20. . . . . . . . . . . . . . 6

1-2-4 Displays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1-3 Method for Connection to the Host. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1-4 Communications with PLC by Direct Connection . . . . . . . . . . . . . . . . . . . . . 10

1-4-1 Functions of the Allocated Bits and Words . . . . . . . . . . . . . . . . . . . 10

1-4-2 Connecting to PLC from Other Companies . . . . . . . . . . . . . . . . . . . 12

1-5 Communications Using RS-232C (NT20-ST128) . . . . . . . . . . . . . . . . . . . . . 13

1-6 Before Operating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Role and Operation of NT20 Section 1-1

1-1 Role and Operation of NT20

NT20 is a programmable terminal used to display and transmit the information in an FA site. The following gives a general description of the role and operation of the NT20 for those who use a programmable terminal (PT) for the first time.

Production Line Status Monitoring

Messages The NT20 warns of system or equipment failures and prompts the appropriate

The NT20 displays real-time information about the system and equipment operating status, etc.

Production Control

Product

Today's target

Current Production

% achieved

remedial action.

NT20M/NT20S

560 units

305 units

54.5 %

1994/1/25

NT600M

441 units

275 units

63.0 %

Alarm

Assembly line B

Positioning pin

is defective.

Panel Switch Functions Setting touch switches on the NT20 allows workers to use the NT20 as an

operating panel. Production data input to the NT20 or the Host can be transmitted to a PLC.

Electroplating Control

Transport

Clamp

UnClamp

Role and Operation of NT20 Section 1-1

1-1-1 Operations of NT20

Displays Screens The information to be displayed (screen data) can be created on a computer

by using the Support Tool and stored in the NT20. The screen data can be displayed on the NT20 in response to the instructions from a Host or touch switch operation.

Host

The screen data designated by instructions from Host or touch switch operation is displayed.

Receives Data from a Host The NT20 can be connected to the Host using the host link or NT link commu-

nications method to enable reception of the required data from the Host.

Host link, NT link, RS-232C, C200H direct communications

Host

Sends Data to a Host Data input through a touch panel can be sent to a Host.

Host

Touch panel

ON/OFF information, numeric data, etc.

Screen Data The screen data to be displayed on the NT20 can be created by a computer

by using the Support Tool. Connect the NT20 to a PC/AT with an RS-232C cable so that the screen data are transferred to the NT20.

Create screen data.

RS-232C

Screen data

PC/AT

(Support Tool)

When the host is connected at serial port A, the personal computer is connected only when transferring screen data between the NT20 and NT Support Tool.

Functions of NT20 Section 1-2

1-2 Functions of NT20

The NT20 has the following features which are different from those of existing NT20M/NT20S;

1-2-1 Features

Downsized Body • The connectors are located at other than the front.

• The communications cable connectors are housed in the unit so that they do not protrude from the unit.

• The tool connectors and the Host communications connectors are used in common (when the host link/NT link is used).

Construction Best Suited to the FA Environment

• Easy-to-read screen even in direct sunlight.

• Long-lived backlight leads free from maintenance.

• Waterproof structure equivalent to oil-resistant IP65.

256 dots

128 dots

Wide angle of visibility ±35°

A Host Link I/F Unit, Screen Data Memory, and a System ROM Are All Incorporated

• With the NT link communications method, 1:1 connections and 1:N connections are possible.

• There is no complicated installation work except a simple connection to a Host.

• A flash memory is used for the screen data memory. There is no need of backup battery.

• The following communications methods are standard for each model: NT20-ST121-E: Host Link (direct) and NT Link NT20-ST121-E + NT20-IF001 + NT600M-LB122-V1: C200H direct communications NT20-ST128: RS-232C communications (command control)

• The NT20 can be connected to Mitsubishi FX-series and Mitsubishi Aseries PLCs. (Refer to PLC Connection, Operation Manual (Cat. No. V042-E1-@)).

Touch Switch Operation The System Menu can be displayed by using the touch switches located in

four corners of the screen.

Compatibility with NT20M/ NT20S

Existing screen data, user programs, are compatible.

Functions of NT20 Section 1-2

1-2-2 Principal Functions of NT20

Functions Related to the Data Display

• Character display Characters of various sizes can be displayed. Characters can flash or be highlighted.

• Figure display Straight lines, circles, and other graphic figures can be displayed.

• Memory data display Contents of the character-string memory table and the numeral memory table can be displayed. The memory table contents can be changed from the PLC/Host.

• Bar graph display Bar graphs corresponding to the contents of the numeral memory table can be displayed.

• Lamp display Lamps which turn on or flash as controlled by the Host can be displayed.

Functions Related to the Data Input

• Input by the touch switch Data can be input by simply touching the screen.

• Numeric setting function The touch keys can be assigned with numeric values so that the numeric values can be input at the operation site and sent to the PLC/Host.

Other Functions

• Buzzer A built-in buzzer can be used.

• Communications with a PLC By connecting the NT20 with a PLC using the host link, NT link, C200H, or RS-232C communications method, data can be received from the host and touch switch status information can be sent to the host.

• System function The system setting and maintenance can be executed by using the System Menu on the screen.

• Screen data creation The screen data can be created by using support tools on the computer and stored in the unit.

• Unrestricted screen display When the NT20 is connected to the host via an RS-232C interface, characters and graphics can be displayed independently of the registered screens (terminal function) (only with NT20-ST128).

Functions of NT20 Section 1-2

1-2-3 Comparison between NT20S, NT20M, and NT20

The NT20 is a unitary PT which incorporates a system ROM, screen memory, and a host I/F unit (Host link, NT link, RS-232C, and C200H direct communications) as the standard equipment in one body.

The NT20 has the following features which are different from those of existing NT20/NT20S:

Function NT20S NT20M-DT121-V2 NT20

Communications • Host link/NT link incorpo-

Communications connector

Host RUN input terminal/ Alarm output terminal

System keys Not provided Provided Not provided Contrast control Back Front Back Waterproof performance Equivalent to oil-resistant

Allowable momentary power interruption time

System ROM Built in (not replaceable) System ROM compatible with

Resume function Not provided Provided Not provided History retaining function Not provided Provided Not provided Screen transfer ❍❍ (Only possible if screen

Screen data compatibility ❍ (Note) – ❍ (Note) PLC ladder compatibility ❍ – ❍ Backlight replacement ❍ Possible with NT20M-DT131. Do not need Screen data memory Built in (flash ROM only) Optional (select from

Screen data memory capacity

Outside dimensions 190 × 110 × 58 mm 220 × 110 × 82 mm 190 × 108 × 53.5 mm

rated NT20S-ST121-EV3

• C200H direct communications incorporated NT20S-ST122-V1

• RS-232C incorporated NT20S-ST128 (other host I/F units cannot be connected)

• The communications connector (9-pin) for a Host is shared with that for the Support Tool. (NT20S-ST121EV3/ST128)

• Connectors for Support Tool (9-pin) and Host connections on the rear face (NT20S-ST122-V1).

Not provided Provided Not provided

IP65 Not guaranteed 5 ms Not guaranteed

96KB 128 KB max. 512 KB

Host I/F units are required. • Host link/NT link

• C200H direct communications Host I/F unit for C200H communications is required.

• RS-232C incorporated NT20-ST128 (other host I/F units can not be connected)

The Support Tool connector (9-pin) is located on the front. The Host connector (25-pin) is located on the back.

Conforms to IP54F. Equivalent to oil-resistant

host I/F unit is required.

data memory is an SRAM)

EPROM, SRAM, and EEPROM)

• The communications connector (9-pin) for a Host is shared with that for the Support Tool. (Port A)

• The communications connector (9-pin) for a Host (Port B)

IP65

Flash ROM rewriteable

❍

Built in (Flash ROM)

Note If a system key function is required on continuous screens or for numerical

setting or buzzer stop, use the Support Tool and set the touch switches which have the system key function in such screens.

For details, refer to 4-7-3 System Key Functions on page 154.

Functions of NT20 Section 1-2

1-2-4 Displays

The NT20 can display various kinds of elements such as characters, lamps, touch switches, and bar graphs on a screen. The screen data displayed on the NT20 are created by using the Support Tool on a computer.

Touch switches

Characters (character string)

Characters (text)

Bar graph

Line 1 Status

Machine name : NT20 Production qty. : 137 units

0% 50% 100%

Stage 1 Stage 2

Emergency stop

Restart

Stage 3

Numeric value (Numeral table)

30%

Lamps

Characters (Text) Characters and marks which do not need to be changed can be written

directly to the screen.

Characters (Character-string Memory Table)

Character-strings stored in the character-string memory table are displayed. The display characters can be changed by changing the data stored in the character-string memory table.

Numeric Values (Numeral Table)

Numbers stored in the numeral table are displayed. The display numbers can be changed by changing the data stored in the numeral table. Hexadecimal values can also be displayed.

Lamps Lamps are displayed as square or round frames and indicate the operating

status. They are controlled by the Host and can be lit (reversed) or made flash (alternates normal with reversed displays).

Touch Switches Touch switches can be set anywhere on the screen. Touching the screen at a

touch switch location can switch the display (display switch function) or notify the Host (notification function). The touch switches can be lit or made flash by controlling from the Host in the same way as the lamps.

Numeric Keys These are the touch switches used to input numeric values.

Bar Graphs The bar graph extends and contracts in proportion to the data stored in the

numeral table. A percentage value can also be displayed simultaneously.

Marks Marks can be designed, created, and handled like characters by the user.

Method for Connection to the Host Section 1-3

1-3 Method for Connection to the Host

This section describes the methods for connection to the host used with the NT20, and the relationship between the connection method and the communications method.

NT20 Communications Ports and Communications Methods

The NT20 has two communications ports. Their uses are indicated in the table below.

Communications

Port

Serial port A Host Link

Serial port B Host Link

Usable Communications

Methods

1:1 NT Link 1:N NT Link (See note.) RS-232C (command control) (NT-

20-ST128) (NT Support Tool connection)

1:1 NT Link 1:N NT Link (See note.) RS-232C (command control) (NT-

20-ST128)

Communications

RS-232C

Note There are two 1:N NT Link communications rates: standard and high-speed.

Converting Communications Type with the RS-232C/RS-422A Link Adapter and RS-422A Converter

An OMRON NT-AL001 Link Adapter or CJ1W-CIF11 RS-422A Converter can be used convert from RS-232C communications to either RS-422A or RS-

485.

• RS-232C

•

RS-232C ⇔ RS-485

⇔ RS-422A

There are two models of Link Adapter/RS-422A Converter are available. They provide different features:

• NT-AL001 Link Adapter The RS-232C port is insulated from the RS-422A/485 terminals. An RS232C cable (2 m max.) can be connected to either serial port A or B on the NT20.

• CJ1W-CIF11 RS-422A Converter The RS-232C port is not insulated from the RS-422A/485 terminals. The CJ1W-CIF11 RS-422A Converter can be connected to either serial port A or B on the NT20.

• Communications Distance Use the NT-AL001 if the communications distance exceeds 50 m.

Method for Connection to the Host Section 1-3

Combinations of Communications Method and Connection Method

The connection methods that can be used depending on the communications method used and the communications type for communications between the NT20 and the host are indicated in the table below.

Communications

type at Host

RS-232C ❍❍❍

RS-232C ××❍

Direct 1:1 connection

1:N connection with RS-422A through

Usable Connection Method Usable Communications Method

Host Link 1:1 NT Link 1:N NT Link

Host

RS-232C (15 m max.)

Link Adapter and RS-422A Converters

NT-AL001 (See note 1.) or CJ1W-CIF11 RS-

422A Converter NT-AL001

RS-422A (total length 500 m, See note 2.)

RS-232C ××❍

1:N connection with RS-485 through

Link Adapter

RS-232C (2 m max.)

Host

Link Adapter and RS-422A Converters

NT-AL001 (See note

1.) or CJ1W-CIF11

RS-422A Converter

NT-AL001 Link Adapter

RS-485

(total length 500 m, See note 2.)

RS-232C (2 m max.)

Host

❍: Connection possible

×: Connection not possible

Note (1) An RS-232C Cable (not shown in the diagram) is required when connect-

ing an NT-AL001 Link Adapter to a PT.

(2) If the CJ1W-CIF11 is used, the total communications distance is 50 m.

This also applies if both the NT-AL001 and CJ1W-CIF11 are used in the same communications path.

+ 281 hidden pages

Omron NT20 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

NT-series Programmable Terminal

Notice:

TABLE OF CONTENTS

About this Manual:

Related Manuals and Their Contents:

WARRANTY

PRECAUTIONS

1 Intended Audience

2 General Precautions

3 Safety Precautions

4 Operating Environment Precautions

5 Application Precautions

6 EC Directives

1-1 Role and Operation of NT20

1-2 Functions of NT20

1-3 Method for Connection to the Host