Cat. No. V069-E1-03
NT21, NT31, and NT631 Series
Programmable Terminals
Reference Manual
NT21, NT31, and NT631 Series
Programmable Terminals
Reference Manual
Revised February 2008
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Notice:
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
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serious injury. Additionally, there may be severe property damage.
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or
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serious injury. Additionally, there may be severe property damage.
Caution Indicates a potentially hazardous situation which, if not avoided, may result in minor or
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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 “PC” means Programmable Controller and is not used as an abbreviation for anything else.
Visual Aids
The following headings appear in the left column of the manual to help you locate different types of
information.
OMRON, 2001
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.
Note Indicates information of particular interest for efficient and convenient operation
of the product.
1, 2, 3... 1. Indicates lists of one sort or another, such as procedures, checklists, etc.
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TABLE OF CONTENTS
PRECAUTIONS xv. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Intended Audience xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1
General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 Role and Operation of the PT 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Functions of the NT21, NT31/NT31C and NT631/NT631C 4. . . . . . . . . . . . . . . . . . . . . . .
1-3 System Configuration 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Communications with the Host 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Communication by Using Memory Links 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Before Operating 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
PT Functions 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 PT Screens 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Areas for Control/Notification 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Memory Tables 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Fixed Displays 90. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-5 Image and Library Data 106. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-6 Lamps 112. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7 Touch Switches 119. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8 Numeral Display 140. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9 Character String Display 148. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10 Graphs 154. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-11 Alarm List, Alarm History 182. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-12 Inputting Numeric Values 192. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-13 Inputting Character Strings 210. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-14 Recipes 216. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-15 Window Function 237. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-16 Special Functions 244. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-17 Device Monitor Function 259. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-18 Mathematical Function 278. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-19 PT Configuration Settings 284. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
How to Use the PT 287. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Screen Creation Procedure 288. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Buzzer, Backlight, and Display Control 290. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 Screen Display and Notification 299. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Display and Control of Windows 307. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-5 Changing Numeral and Character String Display 315. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-6 Display of Graphs 326. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-7 Input of Numeric Values and Character Strings 327. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-8 Using the Alarm List/History Function 346. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-9 Using the Display History Function 351. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-10 Display and Setting of Calendar Clock 354. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-11 Printing Data and Checking the Printer Status 362. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-12 Enabling/Disabling PT Operations 366. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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TABLE OF CONTENTS
SECTION 4
Using Memory Link 369. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1 Operation of the Memory Link 370. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 Outline of Communications 372. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Commands/Responses 375. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-4 Memory Link Online Transfer Function 398. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5
Function Applications 401. . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 Examples of Actual Applications of Direct Access 402. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Examples of Actual Applications of Memory Link 411. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Troubleshooting and Maintenance 415. . . . . . . . . . . . . . . . . .
6-1 Troubleshooting 416. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Responding to Displayed Error Messages 421. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendices
A Specifications 429. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Compatibility with Screen Data of Other PT Models 435. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C NT20S and NT30/620 Compatible Modes 451. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D PC Memory Maps 459. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E Keycode Tables 463. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 465. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 469. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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About this Manual:
This manual describes the basic functions and operation procedures of the NT-series NT21, NT31,
NT31C, NT631, and NT631C Programmable Terminals, their operations when connected to a PC (Programmable Controller) or other 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 Programmable Terminal.
Section 1 describes the functions of the PT.
Section 2 gives basic information on the method for connecting to the host and communication methods,
and describes the names and functions of the parts of the PT.
Section 3 how to use the functions provided by the PT.
Section 4 gives an overview of memory link operations and contains explanations centered on commu-
nications between the PT and host when using memory link.
Section 5 presents a collection of simple practical examples that will give you hints on how to make best
use of the functions of the PT.
Section 6 describes the action to take when PT errors occur.
The Appendices provide the specifications, compatibility with screen data of other PT models, NT30/620
emulation mode, PC memory maps, and keycode tables.
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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.
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Related Manuals:
Related manuals are listed below.
The symbol at the end of the catalog number is the revision number.
Connecting and Setting Up the Programmable Terminal
NT21 PT Setup Manual (V068-E1-)
NT31 and NT31C PT Setup Manual (V062-E1-)
NT631 and NT631C PT Setup Manual (V063-E1-)
These manuals are used separately for the different models of PT. They describe
connecting the Programmable Terminals to a host and peripheral devices and
settings required for communications and applications.
The functions and actual operating messages for the NT21, NT31, NT31C,
NT631, and NT631C PTs are provided in the Reference Manual (V069-E1-).
Programmable Terminal Functions and Operation
NT21, NT31, and NT631 Series PT Reference Manual
(V069-E1-, this manual)
This manual is used for any of the following PTs: NT21, NT31, NT31C, NT631,
and NT631C. It describes screen configurations, part functions, host control
methods, and other application information.
PT connection and setup procedures are described in the NT21 PT Setup Manu-
al (V068-E1-), NT31 and NT31C PT Setup Manual (V062-E1-), and the
NT631 and NT631C PT Setup Manual (V063-E1-).
Creating and Transferring Screen Data, and Installing the System Program
NT-series Support Tool for Windows Ver. 4. Operation Manual (V061-E1-)
The screens displayed on the NT21, NT31, NT31C, NT631, and NT631C PTs
are created with the Support Tool and transferred to the PT. This manual describes how to create and transfer screen data. It also describes how to download a system program to a PT using the System Installer.
The NT-series Support Tool for Windows is normally referred to as merely the
Support Tool.
Connecting to Controllers Not Made by OMRON
PC Connection Manual (V042-E1-)
The NT31, NT31C, NT631, and NT631C PTs can be connected to controllers in
the following series: Mitsubishi’s A Series and FX Series. This manual describes
the connection and setup methods for these controllers.
The NT-series Support Tool for Windows Version 4. is required to connect the
NT31, NT31C, NT631, and NT631C PTs to Mitsubishi controllers.
NT31/NT631 Multivendor Connection Manual (V060-E1-)
The NT31 and NT31C PTs can be connected to controllers in the following series: Allen-Bradley SLC 500 Series, GE Fanuc 90-20 and 90-30 Series, and Siemens S7-300 and S7-400 Series. This manual describes the connection and setup methods for these controllers.
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Read and Understand this Manual
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Please read and understand this manual before using the product. Please consult your OMRON
representative if you have any questions or comments.
Warranty and Limitations of Liability
WARRANTY
OMRON’s exclusive warranty is that the products are free from defects in materials and workmanship for
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a period of one year (or other period if specified) from date of sale by OMRON.
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OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING
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NON–INFRINGEMENT, MERCHANTABILITY, OR FITNESS FOR PARTICULAR PURPOSE OF THE
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PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
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DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. OMRON DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED.
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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
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PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR
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STRICT LIABILITY.
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In no event shall the responsibility of OMRON for any act exceed the individual price of the product on
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which liability is asserted.
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IN NO EVENT SHALL OMRON BE RESPONSIBLE FOR WARRANTY, REPAIR, OR OTHER CLAIMS
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REGARDING THE PRODUCTS UNLESS OMRON’S ANALYSIS CONFIRMS THAT THE PRODUCTS
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WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT SUBJECT TO
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CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
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Application Considerations
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SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to
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the combination of products in the customer’s application or use of the products.
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At the customer’s request, OMRON will provide applicable third party certification documents identifying
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ratings and limitations of use that apply to the products. This information by itself is not sufficient for a
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complete determination of the suitability of the products in combination with the end product, machine,
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system, or other application or use.
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The following are some examples of applications for which particular attention must be given. This is not
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intended to be an exhaustive list of all possible uses of the products, nor is it intended to imply that the
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uses listed may be suitable for the products:
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• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions
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or uses not described in this manual.
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• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical
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equipment, amusement machines, vehicles, safety equipment, and installations subject to separate
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industry or government regulations.
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• Systems, machines, and equipment that could present a risk to life or property.
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Please know and observe all prohibitions of use applicable to the products.
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NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR
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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
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INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
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PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user’s programming of a programmable product, or any
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consequence thereof.
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Disclaimers
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CHANGE IN SPECIFICATIONS
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Product specifications and accessories may be changed at any time based on improvements and other
reasons.
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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
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changed without any notice. When in doubt, special model numbers may be assigned to fix or establish
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key specifications for your application on your request. Please consult with your OMRON representative
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at any time to confirm actual specifications of purchased products.
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DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when
tolerances are shown.
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PERFORMANCE DATA
Performance data given in this manual is provided as a guide for the user in determining suitability and
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does not constitute a warranty. It may represent the result of OMRON’s test conditions, and the users
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must correlate it to actual application requirements. Actual performance is subject to the OMRON
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Warranty and Limitations of Liability.
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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.
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ERRORS AND OMISSIONS
xiii
xiv
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 xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xvi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xv
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 designing FA systems.
• Personnel in charge of installing 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 that 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.
3Safety Precautions
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 above-mentioned applications.
WARNING Do not use input functions such as PT touch switches for applications where
!
danger to human life or serious 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.
Safety Conventions and
their Meanings
This operation manual uses the following conventions and symbols to indicate
cautions, warnings, and dangers in order to ensure safe use of the NT21.
The cautions, warnings, and dangers shown here contain important information
related to safety. The instructions in these cautions, warnings, and dangers must
be observed.
The conventions used and their meanings are presented below.
xvi
WARNING Indicates information that, if not heeded, could possibly result in loss of life or
!
serious injury.
Caution Indicates information that, if not heeded, could result in relatively serious or minor
injury, damage to the product, or faulty operation.
WARNING
Do not attempt to take the Unit apart and do not touch any
internal parts while the power is being supplied. Doing either of
these may result in electrical shock.
3Safety Precautions
xvii
SECTION 1
General
This section provides fundamental information about the functions and features of the PTs, types of connection, communication methods, etc. This information will enable you to understand the applications of the PTs.
1-1 Role and Operation of the PT 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-1 Operation of a PT at an FA Production Site 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1-2 Operations of the PT 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Functions of the NT21, NT31/NT31C and NT631/NT631C 4. . . . . . . . . . . . . . . . . . . . . . . .
1-2-1 Features 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-2 Comparison between NT21, NT31, NT31C, NT631, and NT631C 7. . . . . . . . . . .
1-2-3 Comparisons with Earlier Models 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2-4 Principal Functions of NT21, NT31/NT31C, and NT631/NT631C 14. . . . . . . . . . .
1-2-5 Displays 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 System Configuration 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-1 Peripheral Devices That Can Be Connected 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-2 Connecting to the Host 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4 Communications with the Host 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-1 Direct Connection Function 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-2 Host Link 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-3 NT Link 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-4 Functions of the Allocated Bits and Words 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-5 Clock Data Area (PC to PT) (NT21 Only) 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-4-6 Connecting to other Companies’ PCs 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5 Communication by Using Memory Links 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5-1 Memory Link 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-5-2 Comparison between Direct Connection and Memory Link 35. . . . . . . . . . . . . . . . .
1-5-3 Memory Link Online Transfer Function 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-6 Before Operating 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
1-1 Role and Operation of the PT
The NT21, NT31, NT31C, NT631, and NT631C are sophisticated operator interfaces (Programmable Terminals) that automatically display information and can
also be used for operations when necessary. The following gives a general description of the role and operation of the PT for those using a Programmable Terminal (PT) for the first time.
1-1-1 Operation of a PT at an FA Production Site
1-1SectionRole and Operation of the PT
Production Line Status
Monitoring
Directions to Workers on
the Shop Floor
The PT displays real-time information about the system and equipment operating status, etc. Its power of expression is enhanced by graphs and other visuals,
making the displays easy to understand.
Production Control (3)
Product
Today’s target 560 441
Current production 305 275
Number defective 2 8
Number repaired 7 15
% achieved
The PT warns of system or equipment failures and prompts the appropriate remedial action.
Alarm
Assembly line B
Positioning pin
is defective. Line stopped.
Check the following.
1. Defective pin L3
2. Position of dog M2
3. Mounting of photosensor P5
Panel Switch Functions
2
Setting touch switches on the PT allows workers to use the PT as an operating
panel; the results of the operations are transmitted to the host.
Electroplating control
Transport
Int. stop
Clamp
Unclamp
Adv.
Rev.
Electr.
head
Electro-
lyte
Wash.
head
Wash
Corr. prv.
head
Corr.
prv.fluid
1-1-2 Operations of the PT
1-1SectionRole and Operation of the PT
Transferring Screen Data
Displays Screens
The screen data to be displayed on the PT can be created on a personal computer using the Support Tool. Connect the PT to the personal computer with an
RS-232C cable and transfer the screen data to the PT.
Create screen data.
RS-232C
Screen data
When the host is connected at serial port A,
the personal computer is only connected
when communicating screen data between
the PT and Support Tool.
Personal
computer
(Support Tool)
The information to be displayed (screen data) can be created on a computer using the Support Tool and stored in the PT. The screen data can be displayed on
the PT in response to instructions from the host or touch switch operation.
Host
The screen data designated by
instructions from the host or touch
switch operation is displayed.
Receives Data from a
Host
Sends Data to a Host
The PT can be connected to the host by a host link or NT Link and receive necessary data from the host.
Host link, NT Link
Host
Data input using the touch panel (switch ON/OFF statuses, numeric values,
character strings) can be transmitted to the host.
Host
Touch panel
ON/OFF information, numeric
data, etc.
3
1-2 Functions of the NT21, NT31/NT31C and NT631/NT631C
The NT21, NT31/NT31C and NT631/NT631C have the following features.
1-2-1 Features
Slim Construction
• The PT is slimmer but retains the same functions. The depth is 50 mm max.
when mounted in a panel with the recommended thickness (1.6 to 4.8 mm.)
• The communication cable connectors are housed in the unit so that they do not
protrude from the unit.
Ideal Construction for an FA Environment
• NT21-ST121-E: STN monochrome LCD with backlight
• NT31-ST123-EV3: STN monochrome LCD with backlight
• NT31C-ST143-EV3: STN color LCD with backlight
• NT631-ST211-EV2: High-contrast EL display
• NT631C-ST141-EV2: STN color LCD with backlight
• NT631C-ST153-EV3: TFT color bright LCD with backlight
• The backlight unit and battery can be replaced onsite. (The backlight on the
NT21 cannot be replaced.)
• Degree of protection equivalent to IP65F with oil resistance (See note.), water
resistance equivalent to NEMA4
Note The panel can not be used in some IP65F environments requiring long-term ex-
posure to oil.
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
NT21
260 dots
140 dots
Wide angle of visibility
Panel Contrast and
Brightness Adjustment
Compatibility with Other PTs
NT31/NT31C
320 dots
240 dots
480 dots
Wide angle of visibility
NT631/NT631C
640 dots
On the NT31, NT31C, and NT631C, the contrast and brightness are adjustable
by touch switch operations. (These features are not supported on NT631 models and NT631C-ST153-EV3.) On the NT21, the contrast is adjustable by
switch operations on the back panel.
• There is upward compatibility between the following models for screen data
and user programs: NT20S, NT30, NT30C, NT600S, NT21, NT31, NT31C
NT610G, NT610C, NT620S, NT620C, NT625C, NT631, NT631C. (After being
read to the Support Tool, screens must be modified in accordance with the
screen size. Depending on the function used, partial modification of programs
may also be necessary. For details, refer to Appendix B Compatibility with
Screen Data of Other PT Models (page 435) and the Support Tool Operation
Manual.)
• The panel cut-out dimensions for the NT21 are the same as the dimensions for
the NT20S, the panel cut-out dimensions for the NT31/NT31C are the same as
the dimensions for the NT30/NT30C, and the panel cut-out dimensions for the
NT631/NT631C are the same as the dimensions for the NT625C.
4
Two Ports Featured as Standard:
Port A for Common Use by Support Tool/Host and Port B for Exclusive Use by the Host
• Communication with the host is possible via another port while connected to
the Support Tool.
• Reading bar code data from a bar code reader is possible via another port
while communicating with the host.
Rapid System Program & Screen Data Changes Possible Using a Memory Unit.
• Installing a Memory Unit (NT-MF261) on the rear of the NT21, NT31/NT31C or
NT631/NT631C makes it easy to write screen data into the PT onsite. This enables a rapid response to setup changes.
• The NT21, NT31/NT31C, and NT631/NT631C can store a system program
into a Memory Unit. This enables the system to handle more flexible setups.
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
Screen Data Check
Function
Increased Screen Data
Capacity (NT21 and
NT31/NT31C)
Large Increase in
Maximum Number of
Registered Elements
Binary Data can be Read
to/Written from the Host
Character Display Using
High Definition Fonts
Simple Upgrades
Complies with
International Standards
Compatible with Other
Vendors’ Devices
(NT31/NT31C and
NT631/NT631C)
Screen data can be checked simply by operations in the NT21, NT31/NT31C, or
NT631/NT631C system menu, without connecting up to the Support Tool.
The NT21 data capacity of 512 Kbytes is over five times that of the NT20S and
the NT31/31C data capacity of 1 MB is twice that of the NT30/NT30C, enabling
storage of a larger quantity of screen data.
The number of elements that can be registered on one screen has been considerably increased, making it possible to create more expressive screens. For details, refer to Display Restrictions (page 431).
It is now possible to write binary data stored in words at the host directly to the PT.
This makes data conversion by a program at the host unnecessary, reducing the
load on the host.
Any ×4 characters are displayed with a 32-dot high-definition font.
By using the system installer supplied with the ZJCAT1-EV4.6 Support Tool, the
system program at the NT21, NT31/NT31C or NT631/NT631C can be changed
easily from a personal computer.
The PTs meet UL/CSA standards and EC Directives.
Compatible with the Mitsubishi A Series (Calculator Link) and FX Series (Programming Console), Allen-Bradley SLC 500 Series, GE Fanuc 90-20 and 90-30
Series, and Siemens S7-300 and S7-400 Series, Modicon TSX Series, Sequencers. Specialized system programs can be installed that allow the
NT31/NT31C or NT631/NT631C to be controlled from other companies’ Sequencers. (The NT21 does not support PCs made by other companies.)
Multiple Windows
High-speed 1:N NT Link
Additional Mathematical
Functions
Device Monitor Function
Interlock Function
Up to 3 windows can be displayed simultaneously in the normal display. A
9-word window control area has been allocated in the host; the contents of these
9 words can be changed from the Host to open, close, and move windows.
The V3 versions are compatible with the high-speed 1:N NT Link as well as the
earlier standard 1:N NT Link.
Operands (values referenced by equations) can be registered to allow the PT to
perform calculations automatically and write the results of those calculations to
numeral memory table entries or words in the host.
The new device monitor function can be used to change the PC’s operating
mode or display/change values in the PC’s memory areas. The PVs of several
words can be listed with the device monitor.
PT operations and inputs can be disabled from the PC if interlock bits have been
allocated in the PC for the corresponding PT touch switches, numeric inputs, or
string inputs.
5
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
Improved Lamp/Touch
Switch Guide Characters
NT30/NT30C, and
NT620S/NT620C/NT625C
Compatible
Additional CS/CJ-series
PC Data Areas
Accessible
The following displays can be performed with lamp or touch switch guide characters:
• Display several lines of guide characters.
• Switch the display between different guide characters when OFF and ON.
• Display numeral memory table contents as guide characters.
• Display string memory table contents as guide characters.
The word configuration of the PT status control area and PT status notify area
can be set to emulate those of the NT20S, NT30/NT30C, or NT620S/NT620C/
NT625C; this mode is called NT20S or NT30/620 compatible mode.
When the PT is operating in a compatible mode, it will be equivalent to an
NT20S, NT30/NT30C, or NT620S/NT620C/NT625C in the functions listed below. The PT retains full V2, V3 functionality in all functions other than the ones
listed below. Refer to Appendix C NT20S and NT30/620 Compatible Modes for
more details.
• Word configuration and functions of the PT status control area and PT status
notify area
• Image/library codes
• Insertion of image/library data into character strings
Data areas in CS/CJ-series PCs that were previously inaccessible can be accessed.
All banks in the EM Area, Timer Completion Flags (TU), Counter Completion Flags (CU), Work Area (WR), Task Flags (TK), and the HR Area.
Recipe Function
Adjusting Contrast and
Brightness During PT
Operation
You can set the data (numeric values) for multiple words in record units using the
tabular elements on the PT screen, and write these settings in a single operation
to words on the host (i.e., PC or PT memory) using a touch switch operation on
the PT Unit. Also, multiple words of numeric data can be read from the host in
one operation. In this way, groups of parameter settings can be edited at the PT
Unit, and written to or read from the host.
You can display the brightness and contrast adjustment screen using either the
touch switch or commands from the host, even while the PT is in operation.
6
1-2-2 Comparison between NT21, NT31, NT31C, NT631, and NT631C
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
NT21
NT31/NT31C
The NT21 models are shown in the following table.
Item NT21
Models NT21-ST121-E (Beige)
NT21-ST121B-E (Black)
Display STN monochrome LCD (with white backlight)
Two models are available: the monochrome NT31 and the 8-color NT31C. The
differences between the NT31 and NT31C are shown in the following table.
Item NT31 NT31C
NT631/NT631C
Front panel
color
Display STN monochrome LCD (with
Two models are available: the NT631 has a monochrome (yellow EL) display
NT31-ST123-EV3 (Beige)
NT31-ST123B-EV3 (Black)
white backlight)
NT31C-ST143-EV3 (Beige)
NT31C-ST143B-EV3 (Black)
STN color LCD (with white
backlight)
and the NT631C has an 8-color display. The differences between the NT631 and
NT631C are shown in the following table.
Item
Front panel
color
Display Monochrome EL display STN color LCD (with white backlight) Bright TFT color LCD (with white
NT631-ST211-EV2 NT631C-ST141-EV2 NT631C-ST153-EV3
NT631-ST211-EV2 (Beige)
NT631-ST211B-EV2 (Black)
NT631C-ST141-EV2 (Beige)
NT631C-ST141B-EV2 (Black)
NT631C-ST153-EV3 (Beige)
NT631C-ST153B-EV3 (Black)
backlight)
1-2-3 Comparisons with Earlier Models
Comparison between NT20S and NT21
Item NT20S NT21
NT Support Tool used NT-ZJCAT1-EV4 or NT-ZA3AT-EV2 NT-ZJCAT1-EV4
Effective display area 112 x 56 mm (horizontal x vertical) 117 x 63 mm (horizontal x vertical)
Screen dots (resolution) 256 x 128 dots (horizontal x vertical) 260 x 140 dots (horizontal x vertical)
Number of touch switches 12 x 6 (horizontal x vertical) 13 x 7 (horizontal x vertical)
DIP switch settings On rear of Unit None (software settings)
Use of Memory Unit Not possible Possible (transferring system program
data and screen data)
RS-232C interface Connector (9-pin) also used as port for
screen data transfer.
Backlight life expectancy 10,000 hours min. 50,000 hours min.
Replacement Backlight NT20S-CFL01 Replacement not possible
Battery backup None Possible*1 (numeral table, string table,
System program data Installed in PT (not replaceable) The system installer and system pro-
1:N NT Links Standard only Standard or high-speed
Memory Link Not possible
Number of user-registered screens Maximum of 500 Maximum of 3,999
Screen data capacity
(User program memory)
Numeral/character string table Maximum of 128 entries each Maximum of 2,000 entries each
*3
96 KB 512 KB
*2
- Serial port A connector (also used
for screen data transfer, 9-pin)
- Serial port B connector (for host
communications only, 9-pin)
history data, recipe data)
gram data are supplied with the NT
Support Tool.
Possible
7
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
Item NT21NT20S
Bit memory table None Maximum of 1,000 bits
Mathematical table None 256 entries max.
Calculations can be executed
automatically in the PT.
Image data None Maximum of 4,095 (224 for compatibili-
ty with NT20S)
Library data None Maximum of 12,288 (896 for compati-
bility with NT20S)
Graphic figures (rectangles, polygons, circles/ovals, sectors, filling)
Image library displays None 256 per screen max.
Analog meters None 50 per screen max.
Trend graphs None 1 per screen max.
Broken-line graphs None 1 per screen max.
Alarm lists/history None 4 per screen max.
Recipe function None 1 per screen max.
Windows None 3 per max.
Method for storing numeric values
(numeral memory data and PT Status Control Area)
PT Status Control Area size 4 words 5 words (partial change of contents)
PT Status Notify Area size 3 words 2 words (partial change of contents)
Window Control Area size None 9 words
Clock Data Area size None 4 words
Registering continuous screens Possible Not possible (Use screen switches as
System tenkey Possible Not possible (Use normal tenkey as a
Lamp/Touch switch labels Fixed display (1 line only) - Multiple lines can be displayed
Interlock function None Operations can be disabled from the
Programming Console function Not possible. Possible.
Bar code reader connection Not possible. Possible.
High-quality font display Not possible. Possible.
Character codes CP437 (DOS) CP437 (DOS) or ISO8859/1 (Win-
Accessible CS/CJ PC data Areas --- The data areas listed below can be
None 65,535 total per screen, including other
fixed objects
BCD (binary-coded decimal) BCD (binary-coded decimal) or binary
(4 words for compatibility with NT20S)
(3 words for compatibility with NT20S)
a substitute.)
substitute.)
- ON/OFF switching is possible
- Numeral display is possible
- Character string display is possible
PC by allocating interlock bits to the
corresponding touch switch, numeral
input, character string input,
thumbwheel switches, or recipe
objects.
dows)
accessed in addition to the data areas
accessible with the NT20S.
- EM banks (EM_0 to EM_C)
- Timer Completion Flags (TU)
- Counter Completion Flags (CU)
- Work Areas (WR)
- Task Flags (TK)
- HR Area (HR)
*4
8
*1: The Battery is optional.
*2: The NT20S-ST128 supports RS-232C communications commands instead of memory links.
*3: This is the capacity of the flash memory that stores screen data.
*4: These data areas are accessible only when the PT is connected to the CS/CJ-series PC in a 1:N NT Link. (They are
not accessible through host link communications.)
For differences in programming, refer to Appendix B Compatibility with Screen
Data of Other PT Models on page 435.
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
9
Comparison between NT30/NT30C and NT31/NT31C
y
Item NT30/NT30C NT31/NT31C
Compatible Support Tool(s) NT-ZJCAT1-EV4 or
NT-ZA3AT-EV2
DIP switch settings On rear of unit None (software settings)
Use of B7A Interface Unit Possible Not possible
Use of Memory Unit Not possible Possible
RS-232C interface Connector (9-pin) also used as port for
screen data transfer.
RS-422A/485 interface Terminal block Serial port B (25-pin D-SUB connector)
Backlight color White/red (switchable) White only
Replacement backlight NT30-CFL01/NT30C-CFL01 NT31C-CFL01
NT31/NT31C system program data NT-ZS3AT-EV1
(including system installer)
High-speed 1:N NT Link Not possible Possible
Memory
Link
System program Exclusive use by Memory Link Same as OMRON connection
Screen data Shared with OMRON connection Exclusive use by Memory Link
LCD contrast adjustment By a control on the rear of the unit By touch panel operation
Backlight brightness adjustment Not possible By touch panel operation
Number of user-registered screens 2,000 max. 3,999 max.
Screen data capacity
*1
512 KB 1 MB
(User program memory)
Numeral string data 1,000 max. 2,000 max.
Character string data 1,000 max. 2,000 max.
Bit data 256 1,000 max.
Mathematical table None 256 entries max.
Image data 224 max. 4,095 max.
Library data 896 max. 12,288 max.
Method for storing numeric values
Fixed as BCD (binary coded decimal) Selectable from BCD (binary coded
(numeral memory data and PT status
control area)
PT status control area size 4 words 5 words (partial change of contents)
PT status notify area size 3 words 2 words (partial change of contents)
Window control area size None 9 words
Registering continuous screen Possible Not possible (Use a screen switchover
Lamp/Touch switch guide characters Fixed display (1 line only) - Multiple lines can be displayed
NT-ZJCAT1-EV4
- Serial port A connector (also used
for screen data transfer, 9-pin)
- Serial port B connector (for host
communications only, 25-pin)
(Used for the NT31-ST121-EV2
and NT31C-ST141-EV2. The user
cannot replace the backlight for the
NT31-ST122-EV2,
NT31C-ST142-EV2,
NT31-ST123-EV3, and
NT31C-ST143-EV3.)
The system installer and system
program data are supplied with the
Support Tool.
Calculations can be executed
automatically in the PT.
*2
*2
decimal) or binary
as a substitute.)
- ON/OFF switching is possible
- Numeral display is possible
- Character string display is possible
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
*2
*2
10
Item NT31/NT31CNT30/NT30C
Interlock function None Operations can be disabled from the
PC by allocating interlock bits to the
corresponding touch switch, numeral
input, or character string input.
Device monitor function Not possible Possible
Recipe function None Possible
Accessible CS/CJ-series PC data
areas
*1: This is the capacity of the flash memory that stores screen data.
*2: The values are the same as the NT30/NT30C when the PT is in NT30/620 compatible mode.
*3: These functions are available only in the V2 and V3 versions of the NT31/31C.
--- The data areas listed below can be
accessed in addition to the data areas
accessible with the NT30/NT30C.
- EM banks (EM_0 to EM_C)
- Timer completion flags (TU)
- Counter completion flags (CU)
- Work Area (WR)
- Task flags (TK)
- HR Area
*2
*3
For differences in programming, refer to Appendix B Compatibility with Screen
Data of Other PT Models on page 435.
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
11
Differences between the NT620S/NT620C/NT625C and NT631/NT631C
y
Item NT620S/NT620C/NT625C NT631/NT631C
Compatible Support Tool(s) NT-ZJCAT1-EV4 or
NT-ZA3AT-EV2
DIP switch settings On rear of unit None (software settings)
Use of Memory Unit Not possible Possible
RS-232C interface Connector (9-pin) also used as port for
screen data transfer.
RS-422A/485 interface NT620S/NT620C: None
NT625C: Terminal block (Select
RS-232C or RS-422A/485 with the DIP
switch.)
Replacement backlight NT620C-CFL01 (NT620C)
NT610C-CFL02 (NT625C)
NT631/NT631C system program
data
NT620-ZS3PC/ZS3DV-EV1
(including system installer)
High-speed 1:N NT Link Not possible Possible
Memory
Link
System program Exclusive use by Memory Link Same as OMRON connection
Screen data Shared with OMRON connection Exclusive use by Memory Link
LCD contrast adjustment By a control on the rear of the unit Adjustable with touch panel operation.
Backlight brightness adjustment Not possible Adjustable with touch panel operation.
Number of user-registered screens 2,000 max. 3,999 max.
Screen data capacity
(User program memory)
*1
NT620S: 512 KB
NT620C/NT625C: 1 MB
Numeral string data 1,000 max. 2,000 max.
Character string data 1,000 max. 2,000 max.
Bit data 256 1,000 max.
Mathematical table None 256 entries max.
Image data 224 max. 4,095 max.
Library data 896 max. 12,288 max.
Method for storing numeric values
Fixed as BCD (binary coded decimal) Selectable from BCD (binary coded
(numeral memory data and PT
status control area)
PT status control area size 4 words 5 words (partial change of contents)
PT status notify area size 3 words 2 words (partial change of contents)
Window control area size None 9 words
Registering continuous screen Possible Not possible (Use a screen switchover
Lamp/Touch switch guide
Fixed display (1 line only) - Multiple lines can be displayed
characters
NT-ZJCAT1-EV4
- Serial port A connector (also used
for screen data transfer, 9-pin)
- Serial port B connector (for host
communications only, 25-pin)
Terminal block (A memory switch can
set the RS-232C connector as serial
port B.)
NT631C-CFL01 (for ST151)
(The user cannot replace the
backlight for the
NT631C-ST152-EV2, and
NT631C-ST153-V3.)
NT631C-CFL02 (for ST141)
The system installer and system
program data are supplied with the
Support Tool.
(NT631-ST141-V2 only)
(NT631-ST141-V2 only)
1 MB
Calculations can be executed
automatically in the PT.
*2
*2
decimal) or binary
as a substitute.)
- ON/OFF switching is possible
- Numeral display is possible
- Character string display is possible
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
*2
*2
12
Item NT631/NT631CNT620S/NT620C/NT625C
Interlock function None Operations can be disabled from the
PC by allocating interlock bits to the
corresponding touch switch, numeral
input, or character string input.
Device monitor function Not possible Possible
Recipe function None Possible
Accessible CS/CJ-series PC data
areas
*1: This is the capacity of the flash memory that stores screen data.
*2: The values are the same as the NT620S/620C/NT625C when the PT is in NT30/620 compatible mode.
*3: These functions are available only in the V2 version of NT631 and the V2 and V3 versions of the NT631C.
--- The data areas listed below can be
accessed in addition to the data areas
accessible with the NT30/NT30C.
- EM banks (EM_0 to EM_C)
- Timer completion flags (TU)
- Counter completion flags (CU)
- Work Area (WR)
- Task flags (TK)
- HR Area
*3
For differences in programming, refer to Appendix B Compatibility with Screen
Data of Other PT Models on page 435.
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
13
1-2-4 Principal Functions of NT21, NT31/NT31C, and NT631/NT631C
The following are the principal functions of the NT21, NT31/NT31C, and
NT631/NT631C.
Functions relating to data display
Character display
Characters of various sizes can be displayed. Characters can be flashed and displayed in reverse
video. High grade fonts are available for the characters with their size enlarged.
Graphic display
Polylines, rectangles, polygons, circles, circular arcs, and sector shapes can be displayed. They can
also be tiled with various patterns, flashed, or displayed in reverse video.
Memory data display
The contents of character string memory table entries and numeral memory table entries can be displayed. The contents of memory table entries can be changed from the host.
Graph display
Not only bar graphs but also broken line graphs, trend graphs, and analogue meter graphs can be
displayed using numeral memory table entries.
Lamp display
Lamps can be turned on and flashed under the control of the host. It is also possible to display different
graphics in the ON and OFF states.
Alarm list/history display
Warning messages are automatically displayed in a list in response to the state of a host bit. The time
and the number of times of the messages appeared can also be displayed.
NT21
1-2SectionFunctions of the NT21, NT31/NT31C and NT631/NT631C
NT31/NT31C
NT631/NT631C
Functions relating to data output
Buzzer
A built-in buzzer can be sounded.
Screen printing (NT31/NT31C and NT631/NT631C)
A hard copy of the currently displayed screen can be printed at the
printer connected to the PT.
14
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