Omron C200H-LK401, C500-LK009-V1 User Manual
Cat.No. W135–E1–3
SYSMAC
C200H-LK401/C500-LK009-V1
PC Link
SYSTEM MANUAL
PC Link
System Manual
Revised March 2000
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
!
serious injury.
WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or
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serious injury.
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 “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, 1990
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.
v
TABLE OF CONTENTS
PRECAUTIONS xi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Intended Audience xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 1
Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1 PC Link Systems 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Operating Levels and Polling 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 2
System Design 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1 System Configuration 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Using Link Adaptors 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 3
Data Exchange and Operations 11. . . . . . . . . . . . . . . . . . . .
3-1 LR Area Data 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 LR Area Allocations 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 LR Area Division Tables 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Data Exchange 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 4
Unit Components and Switch Settings 23. . . . . . . . . . . . . . .
4-1 C200H PC Link Units 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 C500 PC Link Units 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Switch Setting Example 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 5
System Installation 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1 Mounting and Connections 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Dimensions 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 6
Programming Considerations 45. . . . . . . . . . . . . . . . . . . . . .
6-1 Response Times 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Reducing Response Time (C200H, C200HS, C200HX/HG/HE(–Z)) 51. . . . . . . . . . . . . . . .
6-3 Programming Examples 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 7
Error Processing 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-1 SR Area Flags 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2 Error Examples 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3 Error Tables 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SECTION 8
Inspection and Maintenance 69. . . . . . . . . . . . . . . . . . . . . . .
Appendix
A Standard Models 71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Specifications 73. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Glossary 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History 83. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vii
About this Manual:
A PC Link System enables use of the LR (Link Relay) data area as a common data area shared by all PCs
in the PC Link System, thus simplifying programming, settings, and data exchange between PCs and permitting effective use of inputs and outputs.
This manual has been written to provide the information necessary to design and install a single-level or
multilevel PC Link System using PC Link Units with C500, C500F, C1000H, C2000, C2000H, C200H,
C200HS, and/or C200HX/HG/HE(-Z) PCs. Before attempting to design, install, or operate a PC Link System, be sure to thoroughly familiarize yourself with the information contained herein. During operation,
refer to the relevant PC Programming Manuals for programming and control system details.
Section 1 introduces PC Link Systems and describes their advantages and characteristics. It also
describes the improvements made in the most recent version.
Section 2 describes the elements that go together to construct a PC Link System and the factors re-
quired to design a System.
Section 3 describes the LR area used in data transfer between the PCs, the method used to allocate
it to the PCs, and the polling process used to actually transfer data.
Section 4 provides details on PC Link Units, the main Units used to build PC Link Systems. Parts of
the Units, switch setting, and examples of switch settings are provided.
Section 5 provides details on mounting and wiring PC Link Units and provides Unit dimensions.
Section 6 offers details and examples of programming PCs to utilize PC Link Systems effectively.
Section 7 describes error indications and error processing. Both indicator lights and dedicated error-
related flags are provided.
Section 8 describes basic maintenance and hardware troubleshooting procedures.
Appendix A provides basic specifications and complete model numbers for OMRON products used
in PC Link Systems.
Appendix B provides general specifications for PC Link Units and PC Link Systems.
This manual is intended to be used in conjunction with the PC Operation Manual and/or Installation
Guides for the PCs in the System. In most Systems, the Link Adaptor Operation Guide will also be
required. The application of Link Adaptors to PC Link Systems is also described in this manual.
This manual is designed for the C500-LK009-V1 and C200H-LK401 PC Link Units. These are sometimes referred to as the LK009-V1 and LK401. The older 3G2A5-LK003-E and 3G2A5-LK009-E PC
Link Units are mentioned only to allow combination with the newer models, and are not discussed in
detail.
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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.
ix
PRECAUTIONS
This section provides general precautions for using the Programmable Controller (PC) and related devices.
The information contained in this section is important for the safe and reliable application of the PC. You must read
this section and understand the information contained before attempting to set up or operate a PC system.
1 Intended Audience xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 General Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Safety Precautions xii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Operating Environment Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Application Precautions xiii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
xi
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 installing FA systems.
• Personnel in charge of designing 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 programming and operating OMRON PCs.
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 extreme important that a PC and all PC Units 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 a PC System to the abovementioned
applications.
3 Safety Precautions
WARNING Do not attempt to take any Unit apart while the power is being supplied. Doing so
!
may result in electric shock.
WARNING Do not touch any of the terminals or terminal blocks while the power is being
!
supplied. Doing so may result in electric shock.
WARNING Do not attempt to disassemble, repair, or modify any Units. Any attempt to do so
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may result in malfunction, fire, or electric shock.
xii
4 Operating Environment Precautions
Caution Do not operate the control system in the following locations:
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• Locations subject to direct sunlight.
• Locations subject to temperatures or humidity outside the range specified in
the specifications.
• Locations subject to condensation as the result of severe changes in temperature.
• Locations subject to corrosive or flammable gases.
• Locations subject to dust (especially iron dust) or salts.
• Locations subject to exposure to water, oil, or chemicals.
• Locations subject to shock or vibration.
Caution 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 fields.
• Locations subject to possible exposure to radioactivity.
• Locations close to power supplies.
5Application Precautions
Caution The operating environment of the PC system can have a large effect on the lon-
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gevity and reliability of the system. Improper operating environments can lead to
malfunction, failure, and other unforeseeable problems with the PC system. Be
sure that the operating environment is within the specified conditions at installation and remains within the specified conditions during the life of the system.
5 Application Precautions
Observe the following precautions when using the PC system.
WARNING Always heed these precautions. Failure to abide by the following precautions
!
could lead to serious or possibly fatal injury.
• Always ground the system to 100 Ω or less when installing the Units. Not connecting to a ground of 100 Ω or less may result in electric shock.
• Always turn OFF the power supply to the PC before attempting any of the following. Not turning OFF the power supply may result in malfunction or electric
shock.
• Mounting or dismounting I/O Units, CPU Units, Memory Units, or any other
Units.
• Assembling the Units.
• Setting DIP switches or rotary switches.
• Connecting cables or wiring the system.
• Connecting or disconnecting the connectors.
Caution Failure to abide by the following precautions could lead to faulty operation of the
!
PC or the system, or could damage the PC or PC Units. Always heed these precautions.
• Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal lines,
momentary power interruptions, or other causes.
xiii
• Always use the power supply voltages specified in this manual. An incorrect
voltage may result in malfunction or burning.
• Take appropriate measures to ensure that the specified power with the rated
voltage and frequency is supplied. Be particularly careful in places where the
power supply is unstable. An incorrect power supply may result in malfunction.
• Install external breakers and take other safety measures against short-circuiting in external wiring. Insufficient safety measures against short-circuiting may
result in burning.
• Do not apply voltages to the Input Units in excess of the rated input voltage.
Excess voltages may result in burning.
• Do not apply voltages or connect loads to the Output Units in excess of the
maximum switching capacity. Excess voltage or loads may result in burning.
• Disconnect the functional ground terminal when performing withstand voltage
tests. Not disconnecting the functional ground terminal may result in burning.
• Be sure that all the mounting screws, terminal screws, and cable connector
screws are tightened to the torque specified in this manual. Incorrect tightening torque may result in malfunction.
• Leave the label attached to the Unit when wiring. Removing the label may result in malfunction if foreign matter enters the Unit.
• Remove the label after the completion of wiring to ensure proper heat dissipation. Leaving the label attached may result in malfunction.
• Double-check all wiring and switch settings before turning ON the power supply. Incorrect wiring may result in burning.
• Wire correctly. Incorrect wiring may result in burning.
• Mount Units only after checking terminal blocks and connectors completely.
• Be sure that the terminal blocks, Memory Units, expansion cables, and other
items with locking devices are properly locked into place. Improper locking
may result in malfunction.
• Check the user program for proper execution before actually running it on the
Unit. Not checking the program may result in an unexpected operation.
• Confirm that no adverse effect will occur in the system before attempting any of
the following. Not doing so may result in an unexpected operation.
• Changing the operating mode of the PC.
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Resume operation only after transferring to the new CPU Unit the contents of
the DM Area, HR Area, and other data required for resuming operation. Not
doing so may result in an unexpected operation.
• Do not pull on the cables or bend the cables beyond their natural limit. Doing
either of these may break the cables.
• Do not place objects on top of the cables or other wiring lines. Doing so may
break the cables.
• Use crimp terminals for wiring. Do not connect bare stranded wires directly to
terminals. Connection of bare stranded wires may result in burning.
• When replacing parts, be sure to confirm that the rating of a new part is correct.
Not doing so may result in malfunction or burning.
• Before touching a Unit, be sure to first touch a grounded metallic object in order
to discharge any static built-up. Not doing so may result in malfunction or damage.
5Safety Precautions
xiv
SECTION 1
Introduction
1-1 PC Link Systems 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 Operating Levels and Polling 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Operating Levels and Polling Section 1-2
1-1 PC Link Systems
A PC Link System is established to interconnect two or more C-series PCs
through PC Link Units to allow data transfer through the LR area of each PC.
PC Link Subsystems can be established within the PC Link System, creating
different levels of operation. Each PC in the PC Link System automatically
exchanges data with all the PCs in the same Subsystem. Any PC in two Subsystems (i.e., any PC to which two PC Link Units are mounted) can be used
as a “transfer PC” to transfer data between two PC Link Subsystems.
The data communications provided by PC Link Systems allow use of the inputs and outputs on all of the PCs in the System in the program of any PC.
PC Link Systems do not establish hierarchies of control between PCs. i.e., all
control actions must be written in the programs of individual PCs.
Compared with I/O Links
Effective I/O Utilization
Simplified System Setup
Subsystem Data Exchange
LK009-V1 Improvements
PC Link Systems exchange data differently to I/O Links in Optical Remote I/O
Systems in three main ways. First, an I/O Link requires the use of I/O points,
reducing the number of I/O points available to connect to I/O devices. Second, the number of bits transferred between PCs in a PC Link System is limited only by the size of the LR area and the number of PCs in the PC Link
System; an I/O Link in a Remote Optical System can handle only one or two
words. Third, I/O Links use programmed input and output operations to transfer data, whereas PC Link Systems use an automatic polling method.
PC Link Systems access only the LR area of the PC for data exchange and
do not require the use of any of the PCs I/O points.
Settings on the PC Link Units allow for data exchange little or no programming required.
Two PC Link Subsystems operating at different levels can exchange data via
the LR area of a PC operating in both Subsystems.
The C500-LK009-V1 differs from the 3G2A5-LK009 in insulation of the transmission section from the internal circuits to improve anti-noise performance.
This increased performance reduces noise interfere originating in ground differences, cable inductance, etc. The C500-LK009-V1 can also be used together with the C200H-LK401. This is not possible with the 3G2A5-LK009.
LK003-E PC Link Units
Although not covered in detail in this manual, the LK003-E PC Link Unit can
be used in PC Link Systems together with the LK009-V1 PC Link Unit. If the
LK003-E is used, the PC Link System must be single-level and all LK009-V1
PC Link Units in the System must be set to LK003-E mode. The LK003-E (or
an LK009-V1 in LK003-E mode) can be used only on C500 PCs and cannot
be used in the same PC Link System as a C200H-LK401 PC Link Unit.
1-2 Operating Levels and Polling
All PC Link Units are assigned unit numbers which determine what part of
the LR area each is to be allocated. Whenever two or more PCs are connected in a PC Link System, one of the PC Link Units must be set as the polling unit (i.e., as Unit #0) and all other PC Link Units must be set as polled
units (i.e., as any Unit other than #0). The polling unit of each PC Link Subsystem does not control the other PCs, which are each controlled independently by their own CPUs.
2
Operating Levels and Polling Section 1-2
A maximum of two PC Link Units can be mounted to the same PC. If two PC
Link Units are mounted to one PC anywhere in the System, the System is
multilevel, and all Units must be set for a Multilevel System (see 4-2-2 Switch
Settings). In a Multilevel System, operating levels must be set to create PC
Link Subsystems. Each Subsystem will have its own polling unit.
Up to four Subsystems are possible. There will always be one more Subsystem than there are PCs to which two PC Link Units are mounted. Only operating levels 0 and 1 are set, as it is necessary only to differentiate between
two PC Link Units on the same PC. All of the PC Link Unit in the same Subsystem must be set to the same level.
A PC Link System with three Subsystems is shown below. Any one of the PC
Link Units in any Subsystem may be designated as the polling unit. All other
Units would be polled units. The small boxes shown connecting the PC Link
Units are Link Adapters, which are used to connect PC Link Units when more
than two are used in a Subsystem. See following sections for details on System design and Link Adapters. (The 3G2A5-LK003-E PC Link Unit cannot be
used in Multilevel Systems.)
PC Link Unit
PC
PC Link Unit
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
PC Link Unit
PC
3
SECTION 2
System Design
2-1 System Configuration 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Using Link Adaptors 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
System Configuration Section 2-1
2-1 System Configuration
PC Link Units are mounted to the PC Racks and connected to each other.
Each PC Link Unit contains a buffer through which data is transferred to and
from the other PC Link Units connected to it. The C500-LK009-V1 can be
used with C500, C1000H, and C2000H PCs, but not with a C200H, C200HS,
or C200HX/HG/HE(-Z) PC. The C200H-LK401 can be used with C200H,
C200HS, and C200HX/HG/HE(-Z) PCs.
Link Adaptors are used in any System other than one containing only two
PC Link Units connected with wire cable. They serve as branching points to
enable connecting more than two PC Link Units, which provide only one connector each allowing only two PC Link Units to be connected directly, or they
serve as conversion points to change between wire and optical fiber
cables.The 3G2A9-AL001 Link Adapter is used as the Branching Link Adapter (see Example 3, below), and combinations of the 3G2A9-AL004 and
3G2A9-AL002 Link Adapters are used to convert to and from optical fiber
cable.Refer to the Link Adapter Installation Guide for Link Adapter specifications and details.
Multilink Systems
Multilevel Systems
Each PC Link Unit has only one connector, making it impossible to connect
more than two PC Link Units directly. Many more PCs can become part of
the same PC Link System however, if Branching Link Adapters are used to
connect through. A PC Link System including six PCs is illustrated below to
show this. This arrangement also protects PC Link communications from
shutting down completely for failures in the line, i.e., if communications are
broken off on a branch line, data transfer will continue to PCs still connected
though PC Link Units to the polling unit.
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
Link Adapters
PC with PC
Link Unit
PC with PC
Link Unit
PC with PC
Link Unit
Up to two PC Link Units can be mounted to one PC. Any PC with two PC
Link Units mounted to it or any PC part of a PC Link System that contains
such a PC is in a Multilevel PC Link System. If any one PC in the PC Link
System has two PC Link Units mounted to it, the entire System is multilevel.
Each group of PCs connected by PC Link Units and sharing parts of the LR
area are part of the same PC Link Subsystem. If a PC has two PC Link
Units mounted to it, it is part of two PC Link Subsystems, with each Subsystem extending from a PC with two PC Link Units to either the end PC or the
next PC with two PC Link Units (see diagram below).
Each Subsystem will have its own polling unit. Each Subsystem is also assigned an operating level to differentiate the two Subsystems to which one
PC belongs. These operating levels do not imply a hierarchy or in anyway
affect operation of the Subsystems except to determine which LR words are
allocated to which Subsystem (see next subsection for details).
The following example conceptually shows a Multilevel PC Link System with
three Subsystems. Although Subsystems 1 and 3 are assigned the same
operating level, they are not related in any special way.
6
System Configuration Section 2-1
Note that a Link Adapter is not used in Subsystem 3. As explained above, it
does not require any because it contains only two PCs.
Subsystem 1
operating level 1
CPU Rack
PC Link Unit
PC Link Unit
CPU
Link
Adapter
Link
Adapter
CPU Rack
PC Link Unit
CPU
CPU Rack
PC Link Unit
Link
Adapter
Link
Adapter
CPU Rack
PC Link Unit
CPU
CPU Rack
PC Link Unit
PC Link Unit
CPU Rack
PC Link Unit
CPU
Link
Adapter
Subsystem 3
operating level 1
CPU Rack
PC Link Unit
Subsystem 2
operating level 0
Transfer PCs
Transmission Distance
Examples
CPU
CPU
CPU
A PC that has two PC Link Units mounted to it is called a transfer PC. This is
because it can be used to transfer data between the two PC Link Subsystems to which it belongs.
Although all the PCs in the same Subsystem automatically have data written
into their LR areas from the PCs in the same Subsystem, this is not the case
with PCs in different Subsystems. A PC that belongs to two Subsystems can,
however, transfer data between Subsystems by reading it from any part of
the LR words it shares with one of the Subsystems and writing the data to
the words allocated it in the other Subsystem. This transfer operation is programmed by the user in the normal user program.
The total length of wire cable (e.g., RS-485 or RS-422) must not exceed 500
m. Individual branch lines from Link Adapters to PC Link Units must not exceed 10 m. Greater transmission distances can be achieved by using optical
links between PC Link Units (see Section 2 Link Adapters).
The following examples demonstrate some of the ways that PCs can be connected in PC Link Systems. Example 3 also provides the appearance two of
the CPU Racks in the System.
An example of a PC Link System designed using optical links is provided in
2-2 Using Link Adapters.
7
System Configuration Section 2-1
Example 1
Single-level System
C-series PC
C-series PC
C-series PC
C-series PC
Example 2
Two-level System
Polled PC
Link Unit
Link
Adaptor
Polled PC
Link Unit
C-series PC
C-series PC C-series PC
Polled PC
Link Unit
Link
Adapter
Polled PC
Link Unit
C-series PC
Link
Adaptor
Polling PC
Link Unit
Polled PC
Link Unit
Polled PC
Link Unit
Link
Adaptor
Polling PC
C-series PC
Polling PC
Link Unit
Link Unit
Polled PC
Link Unit
Link
Adapter
Link
Adaptor
Example 3
Three-level System
Polled PC
Link Unit
C-series PC
Polled PC
Link Unit
Polling PC
Link Unit
Polling PC
Link Unit
C-series PC
C500 CPU Rack
Polled PC
Link Unit
Polling PC
Link Unit
C-series PC
C500 CPU Rack
Polled PC
Link Unit
C-series PCC-series PC
Polled PC
C-series PC
Link Unit
8
System Configuration Section 2-1
System Limitations
The maximum number of PCs that may be used in a PC Link System is limited by the number of LR words available. This is determined by the number
of levels, the specific PCs employed, and the mode settings on the PC Link
Units.
A PC Link Unit must be assigned a number no greater than one less than the
maximum number of allowable PCs to be acknowledge as part of the System. A PC Link Unit assigned a number greater than this limit will not be acknowledged. The maximum number of Units available in a specific PC Link
System is described in the following tables.
Only the PC Link Unit combinations shown below are possible. Note particularly that the LK003-E (or LK009-V1 in LK003-E mode) can only be used with
other LK003-E PC Link Units (or LK009-V1 in LK003-E mode).
Polling Unit: C200H-LK401 PC Link Unit on C200H, C200HS, or C200HX/HG/HE(-Z) PC
Polled units
LK401 on
C200H, C200HS, or
C200HX/HG/HE(-Z)
Multilevel 16 8 16 16
Single-level 32 8 32 32
LK009-V1 on C500
LK009-V1 on C1000H
or C2000H
Max. total
Polling Unit: C500-LK009-V1 PC Link Unit on C1000H or C2000H PC
Polled units
LK009-V1 on C1000H
or C2000H
Multilevel 16 8 16 16
Single-level 32 8 32 32
LK009-V1 on C500
LK401 on
C200H, C200HS, or
C200HX/HG/HE(-Z)
Max. total
Polling Unit: C500-LK009-V1 PC Link Unit on C500 PC
Polled units
LK009-V1 on
C1000H or
C2000H
Multilevel 8 8 Not possible 8 8
Single-level 8 8 Not possible. 8 8
LK003-E mode Not possible 8 8 Not possible. 8
LK009-V1 on
C500
LK003-E on C500
LK401 on
C200H, C200HS, or
C200HX/HG/HE(-Z)
Polling Unit: 3G2A5-LK003-E PC Link Unit on C500 PC
Max. total
Polled units
LK009-V1 on C500 in LK003-E
mode
Single-level 8 8 8
LK003-E on C500 Max. total
9
Using Link Adaptors Section 2-2
2-2 Using Link Adaptors
In a PC Link System, Link Adapters are used whenever more than two PC
Link Units are connected in any one PC Link Subsystem. They are also used
to enable optical links between PC Link Units to provide greater transmission
distance and greater noise resistance. When using Link Adaptors, refer to
the Link Adaptor Installation Guide.
Optical Cable in PC Link
Systems
PC Link Unit
C-series PC
A PC Link System can be set up to take advantage of optical communications by using combinations of Branching and Converting Link Adapters. As
shown below, each PC Link Unit is connected to a Converting Link Adapter
that converts to optical communications. Optical fiber cable is then used to
form the main line and branch lines that connect each PC Link Unit-Converting Link Adapter pair.
The straight lines in the following diagram represent wire cables; those with
zig-zags in them, optical fiber cable.
In the following example, any of the PC Link Units may be set as the polling
unit.
AL004 Link
Adapter
Optical fiber
AL002 Link
Adapter
AL004 Link
Adapter
PC Link Unit
AL002 Link
Adapter
PC Link Unit
AL004 Link
Adapter
AL004 Link
Adapter
PC Link Unit
C-series PC
Handling Optical Fiber
Cable
C-series PC
C-series PC
Although special characteristics of optical fibers call for care in connecting
optical devices, laying optical fiber cable basically does not differ from laying
wire cable. All OMRON PCF and the 3G5A2-PF101 APF (length: 1 m) cable
come with connectors attached. Connectors for all other APF cables must be
assembled by the customer. As using Optical Fiber cable requires the use of
Link Adaptors, refer to the Link Adaptor Installation Guide for more detailed
information.
10
SECTION 3
Data Exchange and Operations
3-1 LR Area Data 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 LR Area Allocations 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3 LR Area Division Tables 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-4 Data Exchange 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
LR Area Data Section 3-1
3-1 LR Area Data
PC Link Systems employ the LR area in the exchange of data. The content
of the LR areas in all PCs in the same PC Link Subsystem (or Single-level
System) is kept consistent. To achieve this, the LR area is divided among all
of the PCs in the Subsystem according to switch settings, and each PC
writes data only to the part of the LR area allocated to it. When a PC writes to
its LR area, the data is updated in the LR areas of all the other PCs in the PC
Link Subsystem during the next polling cycle. The other PCs can then read
this data and use it to coordinate activities with the PC that has written the
data. Each PC thus writes data to its write words and reads data from the
words written to by all of the other PC Link Units in the same Subsystem. Any
action that affects the contents of the LR area is reflected in the LR area in all
PCs. The data transfer is shown below in a Single-level System. Arrows indicate data flow within the PC Link System.
“Write area” is the area written by that Unit. ”Read area” is an area read by
that Unit (i.e., written by another Unit). All unused portions of the LR area
may be used as work bits in programming.
Read
area
Read
area
Read
area
Data Data Data
Data Data Data
Data Data Data
Data Data Data
Read
area
Read
area
Read
area
Read
area
Read
area
Read
area
Read
area
Read
area
Read
area
What determines what part of the LR area is allocated to which PC is the unit
number assigned to each PC Link Unit. These numbers in turn determine which
PC Link Units are polling units and which are polled units.
When PC Link Unit 0 is set for the total number of LR bits used, and each of
the PC Link Units is assigned a unit number, the LR area is divided and assigned to each PC Link Unit automatically.
In a Multilevel System, all PCs have their LR areas divided in half, with one
half being assigned to each of two Subsystems. This is true regardless of
whether or not the PC is actually in two Subsystems, i.e., if only one PC Link
Unit is mounted to a PC in a Multilevel System, one have of the LR area is
not used by the PC Link System.
12
Each PC in two Subsystems (i.e.,with two PC Link Units mounted to it) thus
contains all the LR area data from both Subsystems and has a write data
area in assigned to each. Any PC with only one PC Link Unit contains only
the LR area data for the Subsystem it is in. The LR area of any PC with two
PC Link Units (i.e., the data-transfer PCs) can thus be used to transfer data
between two Subsystems by programming the data-transfer PC to move data
between its section of the first half and its section of the last half of its LR
area. See Section 6 Application Examples for specific LR area allocation examples for both Single-level and Multilevel Systems.
LR Area Allocations Section 3-2
3-2 LR Area Allocations
To enable data transfer between PCs in an PC Link System, part of the LR
area is allocated as the write area for each PC in the System. Which and how
many LR words are allocated to each PC are determined by switch settings,
which are described in 4-2-2 Switch Settings. This section describes the
method for allocating words assuming that each PC is allocated the maximum number of words possible.
LR Area Allocation in
Mixed-PC Systems
If a System contains PCs that have different sizes of LR areas, only the
words that are common to both areas are used in actual PC Link communications. In the following example, the LR areas of each PC are illustrated
below it. Words labeled “work words” are not used by the PC Link System
and are available for use in programming if required. As shown, the rest of
the LR area is divided with the smaller LR area of the other PC to form the
write words for each.
C1000H CPU Rack C500 CPU Rack
PC Link Units
C1000H CPU C500 CPU
LR 00 to LR 15
LR 08 to LR 15
LR 16 to LR 31 LR 16 to LR 31
LR 00 to LR 15
Single-level System
LR 32 to LR 63
Work words
The following example combines one C2000H PC, two C500 PCs, and a
C200H PC in a Single-level System using 128 LR bits per PC. The PC Link
Unit on the C2000H PC at the left end of the System has been designated as
the polling unit. The C500 PCs, providing the smallest LR areas, limit the
number of bits that can be transferred via the PC Link Units. Because the
C500 PC has only 32 words, only words 00 through 31 may be used in the
C2000H PCs (Units #0 and #2). The C2000H and C200H LR words that are
not used (32 to 63) may be used as work bits in programming. The LR word
allocations for each PC Link Unit are given below it. The shaded area is the
section of the LR area written to by the PC Link Unit. The arrows indicate
data flow.
In this example, data written to words LR 8 through 15 by the PC to which PC
Link Unit 2 is mounted is automatically transmitted to words LR 8 through 15
in the other PCs. While the PCs for PC Link Units #0, #1, and #3 are able to
read this data freely, they cannot write in this area. All of the other PCs also
13
LR Area Allocations Section 3-2
are assigned the word shaded below them which they write and can be written by the other PCs.
C500 CPU Rack C500 CPU Rack
PC Link Unit 0
C2000H CPU Rack
C200H CPU Rack
PC Link Unit 1
C2000H CPU
Unit 0
LR 00 to LR 07
LR 00 to LR 07
LR 08 to LR 15
LR 08 to LR 15
LR 16 to LR 23
LR 16 to LR 23
LR 24 to LR 31
LR 24 to LR 31
Useable
LR 32 to LR 63 LR 32 to LR 63
as work
bits
C500 CPU
Unit 1
LR 00 to LR 07
LR 08 to LR 15
LR 16 to LR 23
LR 24 to LR 31
The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-
Note
PC Link Unit 2
C500 CPU
Unit 2
LR 00 to LR 07
LR 08 to LR 15
LR 16 to LR 23
LR 24 to LR 31
PC Link Unit 3
Useable
as work
bits
C200H CPU
Unit 3
LR 00 to LR 07
LR 08 to LR 15
LR 16 to LR 23
LR 24 to LR 31
out any changes in this example.
LR Area Allocations in
Multilevel Systems
In a Multilevel PC Link System, only half of the LR area in each PC is used
for communications in any one PC Link Subsystem. The first half of the
words (from word 00) is used by the Subsystem assigned operating level 0;
the second half, by the Subsystem assigned operating level 1. This is true
regardless of whether or not a PC is actually in two Subsystems. In the example on the next page, the two C500s do not use LR words 16 through 31
because they are not in a Subsystem in operating level 1. If another PC Link
Unit was later added to either PC, these words would be available for use by
it. The number of words used by a Subsystem is thus half of the number of
words provided by the PC with the smallest LR area.
Once the words used in a Subsystem are determined, the process is the same
as for any other PC Link System: words common to all of the PCs in a Subsystem
are divided evenly among the PC Link Units, with unit numbers determining
which words are allocated to which Unit. Again, the Unit assigned number 0 in
each Subsystem is the polling unit for that Subsystem.
14
Below are provided the system configuration, unit numbers, operating levels,
and word allocations for each PC Link Unit in a Multilevel System. The vertical
bars represent the LR area in each PC. Arrows indicate data flow from the words
written to by each PC. Write words for each PC have been shaded.
In the Subsystem assigned operating level 1, LR words 56 through 63 are not
used for PC Link communications because switch settings are available only for
2, 4, 8, or 16 PC Link Units per Subsystem. If a fourth PC was added to this Subsystem, it would be assigned these words.
Although not used by the PC Link System, words labeled “not used” may be
used as work words in programming to manipulate data within the CPU.
LR Area Allocations Section 3-2
In the example below, the C2000H PC would be a transfer PC and could be used
to transfer data between the two Subsystems, e.g., to write to LR word12 by the
C200H PC in operating level 0 to LR word 32, one of its write words in operating
level 1. Any PC in level 1 could then access this data directly from LR word 32 in
its own LR area.
C2000H CPU Rack
PC Link Unit 0
C500 CPU Rack C500 CPU Rack
PC Link Unit 2
PC Link Unit 1
C200H CPU Rack
PC Link Unit 3
C200H CPU Rack
PC Link Unit 0
C1000H
CPU
Rack
PC Link Unit 2
PC Link Unit 1
Operating
level 1
C2000H CPU
Unit 0, level 0
LR 00 to LR 03 LR 00 to LR 03 LR 00 to LR 03 LR 00 to LR 03
LR 04 to LR 07
LR 08 to LR 11 LR 08 to LR 11 LR 08 to LR 11 LR 08 to LR 11
LR 12 to LR 15 LR 12 to LR 15 LR 12 to LR 15 LR 12 to LR 15
Useable
LR 16 to LR 31 LR 16 to LR 31 LR 16 to LR 31
(continued below)
as work
bits.
C500 CPU
Unit 1, level 0
LR 04 to LR 07 LR 04 to LR 07 LR 04 to LR 07
Useable
as work
bits.
(level 1)
C1000H CPU
Unit 1, level 1
C500 CPU
Unit 2, level 0
C200H CPU
Unit 2, level 1
Useable
as work
bits.
Useable
as work
bits.
(level 1)
C200H CPU
Unit 3, level 0
LR 16 to LR 31
LR 32 to LR 63
Operating
level 0
Useable
LR 00 to LR 31 LR 00 to LR 31
as work
bits.
(level 0)
Unit 0, level 1
LR 32 to LR 39
LR 40 to LR 47 LR 40 to LR 47 LR 40 to LR 47
LR 48 to LR 55
Useable
LR 56 to LR 63 LR 56 to LR 63 LR 56 to LR 63
as work
bits.
LR 32 to LR 39 LR 32 to LR 39
LR 48 to LR 55 LR 48 to LR 55
Useable
as work
bits.
The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-
Note
out any changes in this example.
15
LR Area Allocations Section 3-2
System with Three
Subsystems
C2000H PC
Unit 0,
level 0
The following example combines a C2000H PC, fourteen C500 PCs, and
fifteen C200H PCs in a Multilevel System with three Subsystems. Not all PCs
are shown below; missing Units are indicated by dotted lines. The PC Link
Unit farthest to the left in each Subsystem has been designated as the polling unit. The C500 PCs, providing the smallest LR area in their Subsystems,
limit the number of bits that can be transferred via the PC Link Units. The LR
word allocations for each PC Link Unit are given below it. The shaded area is
the section(s) of the LR area written to by the PC Link Unit(s).
In this example, data written to LR 03 by the PC with PC Link Unit 1 of the
leftmost Subsystem (level 0) is automatically transmitted to LR 03 in the
other PCs of that Subsystem. To make the data available to the middle Subsystem (level 1), it is necessary for the transfer PC to transfer the data from
LR 03 to LR 32 or LR 33 (the level 1 write words for that PC). To do this, the
PC must be programmed with MOV LR 03 to LR 32 or LR 33. The data is
then automatically transmitted to LR 16 or LR 17 in the other PCs of the middle Subsystem. To make the data available to the rightmost Subsystem (level
0), it is necessary for the transfer PC to transfer the data from LR 16 or LR
17 to LR 00 or LR 01. Again, the MOV instruction is utilized.
Because this is a Multilevel System, only half of the available LR words may
be used by each Subsystem: the first half by the level 0 Subsystems, the
second half by the level 1 Subsystem. The unused LR words in each PC may
be used as work bits in programming.
C200H PC
Unit 1,
level 0
C500 PC
Unit 1,
level 1
C1000H PC
Unit 1,
level 0
C1000H PC
Unit 7,
level 0
C200H PC
Unit 15,
level 0
Unit 0,
level 1
The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-
Note
C500 PC
Unit 7,
level 1
Unit 0,
level 0
out any changes in this example.
16
LR Area Division Tables Section 3-3
C2000H PC
Unit 0,
Unit 0,
level 0
Unit 0,
level 1
Unit 15
level 0
level 0
LR 00 & LR 01 LR 00 & LR 01
LR 02 & LR 03
LR 30 & LR 31
LR 32 to
LR 63
C200H PC
Unit 1,
level 0
LR 02 & LR 03
LR 30 & LR 31
LR 32 to
LR 63
C200H PC
Unit 15, level 0
Unit 0, level 1
LR 00 & LR 01
LR 02 & LR 03
LR 30 & LR 31
LR 32 & LR 33
LR 34 & LR 35
LR 46 & LR 47
LR 48 to
LR 63
Useable
as work
bits
C500 PC
Unit 1,
level 1
LR 00 to
LR 15
LR 16 & LR 17
LR 18 & LR 19
LR 30 & LR 31
Unit 0, level 0
Unit 1, level 0
Unit 7, level 0
Unit 0, level 1
Unit 1, level 1
Unit 7, level 1
C500 PC
Unit 7, level 1
Unit 0, level 0
LR 00 & LR 01
LR 02 & LR 03
LR 14 & LR 15 LR 14 & LR 15
LR 16 & LR 17
LR 18 & LR 19
LR 30 & LR 31
C1000H PC
Unit 1,
level 0
LR 00 & LR 01
LR 02 & LR 03
LR 16 to
LR 31
LR 32 to
LR 63
C1000H PC
Unit 7,
level 0
LR 00 & LR 01
LR 02 & LR 03
LR 14 & LR 15
LR 16 to
LR 31
LR 32 to
LR 63
Useable as work bits
3-3 LR Area Division Tables
The PC Link Unit has the ability to transfer from 2 to 32 words (32 to 512
bits) of data between PCs. The LR area is divided according to the number of
PC Link Units and the number of Subsystems in the System. Refer to the
appropriate table for your System. Any unused portion of the LR area may be
used as work bits. The number of LR bits transferred per Unit and Single-level/Multilevel designation are made on switches on the PC Link Units.
Single-level Systems
C200H, C200HS, C200HX/HG/HE(-Z), C1000H, or C2000H PCs
No. of PC Link Units 17 to 32 9 to 16 5 to 8 3 or 4 2
LR Wd LR bits/Unit 32 64 128 256 512
0 and 1 Unit #0 Unit #0 Unit #0 Unit #0 Unit #0
2 and 3 Unit #1
4 and 5 Unit #2 Unit #1
6 and 7 Unit #3
8 and 9 Unit #4 Unit #2 Unit #1
10 and 1 1 Unit #5
12 and 13 Unit #6 Unit #3
14 and 15 Unit #7
16 and 17 Unit #8 Unit #4 Unit #2 Unit #1
18 and 19 Unit #9
20 and 21 Unit #10 Unit #5
22 and 23 Unit #11
24 and 25 Unit #12 Unit #6 Unit #3
26 and 27 Unit #13
28 and 29 Unit #14 Unit #7
Useable as work bits
17
LR Area Division Tables Section 3-3
30 and 31 Unit #15
32 and 33 Unit #16 Unit #8 Unit #4 Unit #2 Unit #1
34 and 35 Unit #17
36 and 37 Unit #18 Unit #9
38 and 39 Unit #19
40 and 41 Unit #20 Unit #10 Unit #5
42 and 43 Unit #21
44 and 45 Unit #22 Unit #11
46 and 47 Unit #23
48 and 49 Unit #24 Unit #12 Unit #6 Unit #3
50 and 51 Unit #25
52 and 53 Unit #26 Unit #13
54 and 55 Unit #27
56 and 57 Unit #28 Unit #14 Unit #7
58 and 59 Unit #29
60 and 61 Unit #30 Unit #15
62 and 63 Unit #31
18
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