Omron 3G3FV-PDRT1-SIN User Manual
Cat. No. I525-E1-1
USER’S MANUAL
CompoBus/D (DeviceNet)
Communications Card
MODEL 3G3FV-PDRT1-SIN
(For SYSDRIVE 3G3FV High-function General-purpose Inverters)
Thank you for choosing a 3G3FV High-function General-purpose Inverter and
CompoBus/D Communications Card. This manual describes the specifications
and operating methods of the CompoBus/D Communications Card used for
exchanging data between an Inverter and a Programmable Controller.
Specifically, it describes the operation methods, communications methods, and
data setting methods of the 3G3FV-PDRT1-SIN CompoBus/D Communications
Card. Proper use and handling of the product will help ensure proper product
performance, will length product life, and may prevent possible accidents.
Please read this manual thoroughly and handle and operate the product with care.
For details about the 3G3FV Inverter and CompoBus/D communications system,
refer to the following manuals.
SYSDRIVE 3G3FV User’s Manual (I516)
CompoBus/D Operation Manual (W267)
NOTICE
1. This manual describes the functions of the product and relations with other products. You should assume that anything not described in this manual is not possible.
2. The name “SYSMAC” in this manual refers to the SYSMAC C200HX/HG/HE and
CV-series Programmable Controllers that can be connected to a CompoBus/D
System. (C200HS Programmable Controllers support only the remote I/O function.)
3. Although care has been given in documenting the product, please contact your
OMRON representative if you have any suggestions on improving this manual.
4. The product contains potentially dangerous parts under the cover. Do not attempt
to open the cover under any circumstances. Doing so may result in injury or death
and may damage the product. Never attempt to repair or disassemble the product.
5. We recommend that you add the following precautions to any instruction manuals
you prepare for the system into which the product is being installed.
S Precautions on the dangers of high-voltage equipment.
S Precautions on touching the terminals of the product even after power has been
turned off. (These terminals are live even with the power turned off.)
6. Specifications and functions may be changed without notice in order to improve
product performance.
Items to Check Before Unpacking
Check the following items before removing the product from the package:
S Has the correct product been delivered (i.e., the correct model number and speci-
fications)?
S Has the product been damaged in shipping?
S Are any screws or bolts loose?
S Have all accessories been delivered together with or attached to the product?
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 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.
Note Indicates information of particular interest for efficient and convenient operation of the product.
OMRON, 1998
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.
H Installation and Wiring Precautions
WARNING Never touch any internal parts of the Inverter. Doing so may result in electric shock.
!
WARNING Install, remove, or wire the Optional Card only after turning OFF the Inverter , making
!
sure that all the indicators of the Inverter are OFF, and waiting for the time specified
on the front cover of the Inverter to elapse. Not doing so may result in electric shock.
WARNING Do not damage, press, or put excessive stress or heavy objects on the cables. Doing
!
so may result in electric shock, product malfunction, or product damage.
Caution Do not touch the parts of the Optional Card by hand. Otherwise, static electricity may
!
damage the Optional Card.
Caution Be sure that the connector of the Optional Card is firmly in place on the Inverter. Im-
!
proper connection may cause injury, product malfunction, or product damage.
H Adjustment Precautions
Caution Be careful when changing settings. Not doing so may result in injury or product dam-
!
age.
Table of Contents
Chapter 1. Functions and System Configuration 1-1. . . . . . . . . . . . . . . . .
1-1 Functions 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-2 CompoBus/D Features 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3 CompoBus/D System Configuration 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-1 System Configuration 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-2 Configurator Overview 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-3 CompoBus/D Communications Specifications 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3-4 Inverter 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2. CompoBus/D Communications Line Design 2-1. . . . . . . . . . .
2-1 Network Configuration Overview 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1-1 Network Components 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1-2 Connections 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2 Network Configuration Restrictions 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2-1 Baud Rate and Communications Distance 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2-2 Locating Terminating Resistors 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3 Communications Power Supply 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3-1 Locating the Communications Power Supply 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-3-2 Step 1: Determining the Best Location for the Power Supply from a Graph 2-9. . . . . . .
2-3-3 Step 2: Calculating the Best Location of the Actual Nodes 2-11. . . . . . . . . . . . . . . . . . . . .
2-3-4 Step 3: Splitting the System into Multiple Power Supplies 2-13. . . . . . . . . . . . . . . . . . . . .
2-3-5 Dual Power Supplies 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4 Communications Line Noise Prevention 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4-1 Communications Line Noise 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4-2 Grounding the Network 2-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4-3 Communications Power Supply Noise Prevention 2-16. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4-4 Noise Prevention Wiring 2-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4-5 Noise Prevention for Peripheral Devices 2-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 3. Setup and Wiring 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1 Nomenclature and Settings 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1-1 Names of Parts 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1-2 Terminal Block 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1-3 Operation Indicators 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-1-4 Baud Rate and Node Address Settings 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2 Installation and Wiring 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2-1 CompoBus/D Communications Card Installation 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2-2 Communications Cable Wiring 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4. CompoBus/D System Startup 4-1. . . . . . . . . . . . . . . . . . . . . . .
4-1 SYSMAC Word Allocations and Scan List 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1-1 Overview and Restrictions of Word Allocations 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1-2 Scan Lists 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1-3 Fixed Word Allocations 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1-4 Free Allocations 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2 SYSDRIVE 3G3FV Settings 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2-1 Frequency Reference Selection 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2-2 Inverter Run Command Selection 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2-3 CompoBus/D Communications Settings 4-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-2-4 Frequency Reference Settings and Display Units 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-3 Startup Procedure 4-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents
Chapter 5. CompoBus/D Communications Card Operations 5-1. . . . . . .
5-1 Remote I/O 5-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1-1 Standard Remote I/O (Initial Setting) 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-1-2 Types of Remote I/O Operation 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2 Message Communications (DeviceNet Explicit Messages) 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2-1 Overview of Message Communications (Explicit Message Operations) 5-8. . . . . . . . . . .
5-2-2 Sending and Receiving Messages with C200HX/HG/HE PCs 5-9. . . . . . . . . . . . . . . . . .
5-2-3 SYSMAC CV-series Message Transmission 5-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2-4 Overview of Messages and Responses 5-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2-5 Motor Data Objects: Class 28 Hex 5-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2-6 Control Supervisor Objects: Class 29 Hex 5-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-2-7 AC/DC Drive Objects: Class 2A Hex 5-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-3 Switching Remote I/O Operation 5-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4 Special Remote I/O Operation 5-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4-1 Overview of Special Remote I/O 5-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4-2 Special Remote I/O Communications Timing 5-29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4-3 Inputting Control/Frequency 5-30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4-4 Inverter Monitoring Functions 5-32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-4-5 Parameter Constant Reading and Writing 5-39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 6. Communications Errors 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1 Communications Line Errors 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2 Message Communications Errors 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-3 Special Remote I/O Errors 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-4 Inverter Faults 6-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 7. Communications Programs (SYSMAC C200HX/HG/HE PCs) 7-1. . .
7-1 Standard Remote I/O Programming 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2 Message Communications Programming 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2-1 Inverter Fault Processing 7-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2-2 Reading/Writing Data 7-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3 Special Remote I/O Programs 7-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3-1 Simple Operation Programs 7-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3-2 Reading Parameter Data 7-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-3-3 Writing Parameter Data 7-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 8. Appendices 8-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-1 Specifications 8-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2 Objects 8-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2-1 Identify Objects (Identification Information): Class 01 Hex 8-3. . . . . . . . . . . . . . . . . . . .
8-2-2 Message Router Objects: Class 02 Hex 8-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2-3 DeviceNet Objects: Class 03 Hex 8-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2-4 Assembly Objects: Class 04 Hex 8-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-2-5 DeviceNet Connection Objects: Class 05 Hex 8-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-3 CompoBus/D Communications Response Time 8-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Index I-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Revision History R-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1
Chapter 1
Functions and System
Configuration
1-1 Functions
1-2 CompoBus/D Features
1-3 CompoBus/D System Configuration
Functions and System Configuration Chapter 1 1-1 Functions
The 3G3FV-PDRT1-SIN CompoBus/D Communications Card is a dedicated communications interface
card that makes it possible for the SYSDRIVE 3G3FV High-function General-purpose Inverter to communicate with SYSMAC Programmable Controllers. Installing a CompoBus/D Communications Card in
the SYSDRIVE 3G3FV Inverter permits a Programmable Controller to monitor RUN/STOP and operating conditions, and to make changes in set values.
3G3FV-PDRT1-SIN
CompoBus/D Communications Card
H Easy Communications
The following two functions can be used simultaneously in CompoBus/D communications between the
CPU Unit of a SYSMAC PC and the SYSDRIVE 3G3FV Inverter.
S Remote I/O Communications
I/O is automatically transferred between Slaves and the CPU Unit without any special programming in the CPU Unit. (Automatically transmits Inverter control inputs such as RUN or STOP from
a SYSMAC PC to the SYSDRIVE 3G3FV Inverter and returns operation status of the Inverter or
output frequency monitor data. )
S Message Communications
Message communications are performed between a CPU Unit to which a Master Unit is mounted
and Slaves (SYSDRIVE 3G3FV Inverters) by executing specific instructions (such as CMND
and IOWR, depending on the model of SYSMAC PC used) from the program in the CPU Unit.
(Allows some parameter setting and monitoring, Inverter output frequency, output voltage, or
output current. If the remote I/O communications is not performed, Inverter control data such as
RUN or STOP can be input through this message communications function.)
Remote I/O communications for the CompoBus/D Communications Card are performed using either 4
or 6 words allocated in the I/O Area of the SYSMAC PC. The Inverter can be controlled using remote I/O
communications because the basic control I/O functions, frequency setting functions, and output frequency monitoring functions are assigned to remote I/O. The allows the Inverter to be controlled
through simple I/O processing.
H Communications with SYSMAC C200HX/HG/HE and CV-series PCs
The CompoBus/D communications system is supported by both SYSMAC C200HX/HG/HE and CV-series Programmable Controllers. Up to twice as many Inverters can be connected in comparison to SYSMAC BUS Remote I/O Systems to support even larger control systems.
Note 1. The maximum number of nodes that can be connected to the system depends on the type of
Master Unit used, whether the message function is used, and the number of words used by
remote I/O communications. See 1-3 CompoBus/D System Configuration for further details.
1-2
Functions and System Configuration Chapter 1
Note 2. The SYSMAC CV Series includes the CV1000, CV2000, and CVM1 Programmable Control-
lers. SYSMAC C200HS PCs support only remote I/O communications.
H Multi-vendor Network
The CompoBus/D conforms to the DeviceNet open field network specification, which means that devices (Masters and Slaves) produced by other manufacturers can also be connected to the Network.
The CompoBus/D Communications Card supports the DeviceNet AC/DC drive object, so that the functions available for CompoBus/D communications can be used in DeviceNet communications.
H Choice of Communications Functions
The CompoBus/D Communications Card has various functions to choose from to suit the Inverter applications.
S Remote I/O Communications
Either basic remote I/O control or special remote I/O can be chosen for remote I/O allocation to
suit the application. Special I/O control can be used to control and set all functions for 3G3FV -series Inverters.
S Message Communications
Basic Inverter control and monitoring is possible with DeviceNet explicit messages, which are
defined for AC/DC driver objects. Remote I/O and message communications can be used simultaneously, i.e., remote I/O control can be performed at the same time as other control using message communications.
1-3
Functions and System Configuration Chapter 1
H Applicable to Various System Configurations
Remote I/O communications and message communications are available as communications functions. Normal control inputs are controlled by the remote I/O communications function. When necessary, the message communications function is used to monitor each Inverter. It is possible to control the
selection of either the communications control input or local control input provided that the Inverter software version is higher than Ver. 1042.
Note For connecting the CompoBus/D Communications Card of the Inverter, use DCA1-5C10 Thin
Cables and branch them from the T-branch Tap.
Thick Cables cannot be used for this kind of wiring because of the terminal block dimensions.
As for multi-drop wiring, use Thin Cables for direct insertion. Thick Cables cannot be used for this
kind of wiring.
C200HW-DRM21-V1 or
CVM1-DRM21-V1 (Master Unit)
Remote I/O function
Output (PC to 3G3FV)
Wd 15 to 0
n Inverter run commands
n+1 Rotational speed reference
Input (3G3FV to PC)
Message communications function
Reading Inverter
output current
3G3FV-PDRT1-SIN
CompoBus/D
Communications Card
Note: T-branch wiring using Thin
Cables
Switch
Run
Reverse
Forward
Selection of either the communications
control input or local control input is
possible using Net.Ctrol./Net.Ref.
(Applicable to Inverter software higher
than Ver. 1042.)
3G3FV-series Inverter
Stop
Power supply
Motor
1-4
Functions and System Configuration Chapter 1 1-2 CompoBus/D Features
H System Configuration Example
OMRON Master Unit
CompoBus/D Network
Master by
other company
OMRON Master Unit
OMRON Configurator
OMRON Configurator
OMRON Slaves
Slaves by other company
CompoBus/D Network
Slaves by other company
OMRON Slaves
OMRON Slaves
Slaves by other company
H Multi-vendor Network
The CompoBus/D conforms to the DeviceNet open field network specification, which means that devices (Masters and Slaves) produced by other manufacturers can also be connected to the Network.
Therefore, a wide range of field-level applications can be supported by combining valve devices, sensors, and other devices.
H Simultaneous Remote I/O and Message Services
Remote I/O communications to constantly exchange I/O data between the PC and Slaves can be
executed simultaneously with message communications, to send/receive Master Unit data as required
by the application. Therefore, a CompoBus/D Network can be installed to flexibly handle applications
that require both bit data and message data. Message communications can be achieved either by using
OMRON’s FINS commands or by using DeviceNet explicit messages.
H Connect Multiple PCs to the Same Network
A Configurator (sold separately) can be used to enable connection of more than one Master to the Network, allowing message communications between PCs and between multiple groups of PCs and
Slaves. This allows the CompoBus/D Network to be used as a common bus to unify controls while reducing wiring.
H Handle Multi-point Control and Line Expansions with Multi-layer
Networks
A Configurator (sold separately) can be used to enable mounting more than one Master Unit to a single
PC, allowing control of many more points. This feature can easily handle line expansions and other applications.
1-5
Functions and System Configuration Chapter 1
H Free Remote I/O Allocation
A Configurator (sold separately) can be used to enable flexible allocation of I/O, i.e., in any area and in
any order. This allows I/O allocations that suit the application to simplify programming and enable effective usage of PC memory areas.
H Handle Slaves with Different Response Speeds
A Configurator (sold separately) can be used to set the communications cycle time, enabling usage of
Slaves with slow response times.
H Easily Expand or Change Lines with Various Connection Methods
Use a multi-drop trunk line, T-branch multi-drop lines, or daisy-chain drop lines. All three connection
methods can be combined to flexibly construct a Network that meets the needs of the application.
Note For connecting the CompoBus/D Communications Card of the Inverter, use DCA1-5C10 Thin
Cables and branch them from the T-branch Tap.
1-6
Functions and System Configuration Chapter 1 1-3 CompoBus/D System Configuration
1-3-1 System Configuration
CompoBus/D is a multi-bit, multi-vendor network that combines controls and data on a machine/linecontrol level and that conforms to DeviceNet open field network specifications.
Two types of communications are supported: 1) Remote I/O communications that automatically transfer I/O between Slaves and the CPU Unit of a SYSMAC PC without any special programming in the CPU
Unit and 2) Message communications are performed between a CPU Unit to which a Master Unit is
mounted and Slaves by executing specific instructions (such as CMND and IOWR, depending on the
model of SYSMAC PC used) from the program in the CPU Unit.
A Configurator (sold separately) can be used to enable following. This allows the support of an even
larger control system.
S I/O area words can be flexibly allocated for remote I/O communications.
S More than one Master Unit can be mounted to a single PC.
S More than one Master Unit can be connected in a single Network.
H Fixed Allocation: Configuration without a Configurator
C200HW-DRM21-V1 or CVM1-DRM21-V1
CompoBus/D Master Unit
SYSDRIVE 3G3FV
Slave
Slave
CV-series PCs: 64 nodes max. (including the Master Unit)
C200HX/HG/HE PCs: 64 nodes max. (including the Master Unit)
C200HS PCs: 33 nodes max. (including the Master Unit)
Slave
Slave
3G3FV-PDRT1-SIN
CompoBus/D Communications Card
Inverter
Note 1. The Master Unit occupies one node of the CompoBus/D Network.
Note 2. If C200HS PCs are used, only remote I/O communications are possible.
Note 3. If one node uses more than one word, the maximum number of nodes will be reduced by one
node for each extra word that is used.
1-7
Functions and System Configuration Chapter 1
H Free Allocation: Configuration with a Configurator
C200HW-DRM21-V1 or CVM1-DRM21-V1
CompoBus/D Master Unit
3G8F5-DRM21 (ISA Board)
or
SG8E2-DRM21 (PC Card)
Configurator
Slave
Configurator
SlaveSlave
3G3FV-PDRT1-SIN
CompoBus/D Communications Card
64 nodes max. (including the Master Unit)
Slave SlaveSlave
64 nodes max. (including the Master Unit)
SYSMAC DRIVE 3G3FV Inverter
Note 1. The Master Unit and Configurator each occupy one node of the CompoBus/D Network.
Note 2. If C200HS PCs are used, only remote I/O communications are possible.
Note 3. The maximum number of nodes that can be connected to the Network will be limited by the
maximum number of control points of the PC used.
1-3-2 Configurator Overview
The Configurator is software application run on an IBM PC/AT or compatible computer and is used to
support a CompoBus/D communications system. OMRON provides interfaces (hardware) for connecting computers to the CompoBus/D Network. The Configurator occupies one node on the CompoBus/D
Network, but has no specific functions on the network itself. The Configurator provides the following
functions.
S Free Allocation of Remote I/O
The remote I/O allocations in the PCs can be changed from the Configurator. I/O can be flexibly
allocated for each node within the specified I/O areas.
S More than One Master Unit per Network
Slaves can be set for each Master Unit from the Configurator enabling communications between
multiple groups of PCs and Slaves. The maximum number of nodes connected to one Network
remains at 64. One Slave can be connected to no more than one Master Unit.
1-8
Functions and System Configuration Chapter 1
S More than one Master Unit per PC
Remote I/O can be allocated for each Slave of the Master Unit from the Configurator, so more
than one Master Unit can be mounted to the same PC.
Note In allocating Remote I/O for each Master Unit, be careful not to allow any dual allocation.
H Configurator Specifications
Item 3G8F5-DRM21 3G8E2-DRM21
Personal computer Desktop model Notebook model
Components Installation disk (software)
Dedicated ISA Board
Operating
environment
Hardware Computer: IBM PC/AT or compatible
CPU: With Windows 95: 66 MHz i486 DX2 min.
With Windows NT: 90 MHz Pentium min.
Memory: With Windows 95: 12 MB min. (16 MB or more recommended)
With Windows NT: 16 MB min. (24 MB or more recommended)
Hard disk: 5 MB min. free space
OS Windows 95 or Windows NT 3.51/4.0 Windows 95
Installation disk (software)
Dedicated PMCIA Card
CompoBus/D Interface Unit
CompoBus/D
interface
Relation to Network Operates as one node on the Network, requires one node address, and only
Dedicated ISA Board Dedicated PMCIA Card
CompoBus/D Interface Unit
one Configurator can be connected to the Network. (The Configurator can be
disconnected from the Network after remote I/O has been allocated.)
1-9
Functions and System Configuration Chapter 1 1-3-3 CompoBus/D Communications Specifications
Item Specifications
Communications protocol DeviceNet
Supported connections (commu-
nications)
Connection forms Combination of multi-drop and T-branch connections (for trunk and drop
Baud rate 500 Kbps, 250 Kbps, or 125 Kbps (switchable)
Communications media Special 5-wire cables (2 signal lines, 2 power lines, and 1 shield line)
Communications
distances
Communications power supply 24 VDC $1%, supplied externally
Max. number of nodes 64 nodes
Max. number of Masters Without Configurator: 1
Max. number of Slaves Without Configurator: 63
Error control CRC check
500 Kbps Network length: 100 m max.
250 Kbps Network length: 250 m max.
125 Kbps Network length: 500 m max.
Master-Slave: Remote I/O and explicit messages
Peer-to-peer: FINS messages
Both conform to DeviceNet specifications.
lines)
Thick Cable: DCA2-5C10 (100 m)
Thin Cable: DCA1-5C10 (100 m)
Drop line length: 6 m max.
Total drop line length: 39 m max.
Drop line length: 6 m max.
Total drop line length: 78 m max.
Drop line length: 6 m max.
Total drop line length: 156 m max.
(Slave power supply: 11 to 25 VDC)
Recommended power supply: OMRON S82H Series or S82J Series
With Configurator: 63
With Configurator: 63
1-3-4 Inverter
The maximum number of Inverters that can be connected to one Network depends on the PC model
that is used, the remote I/O functions of the Inverter, and whether message communications are used or
not. (Use the message communications function for setting some parameters and for monitoring the
output current.) The differences between models are provided in the following tables.
1-10
Functions and System Configuration Chapter 1
H Communications without Configurator: Fixed Allocation
Applicable PC CV Series C200HX/HG/HE C200HS
Master Unit CVM1-DRM21-V1 C200HW-DRM21-V1
Supported communica-
tions
Max. No. of Slaves per
Master Unit
Max. No. of controlled
points per Master Unit
Allocation areas OUT: CIO 1900 to CIO 1963
Allocation method Words are allocated for each node to the above data areas in node address or-
Max. No.
of
Inverters
Without explicit messages
With explicit
messages
Remote I/O and messages Remote I/O and mes-
sages
63 50 32
2,048 1,600 1,024
OUT: IR 050 to IR 099
IN: CIO 2000 to CIO 2063
der only.
8-point Slaves: Allocated 1 word
16-point Slaves:Allocated 1 word
Slaves with more than 16 points: Allocated multiple words
4 words remote I/O: 32
6 words remote I/O: 21
4 words remote I/O: 32
6 words remote I/O: 21
IN: IR 350 to IR 399
4 words remote I/O: 25
6 words remote I/O: 16
4 words remote I/O: 25
6 words remote I/O: 16
Remote I/O
OUT: IR 50 to IR 81
IN: IR 350 to IR 381
4 words remote I/O: 16
6 words remote I/O: 10
–
H Communications with Configurator: Free Allocation
Applicable PC CV-series C200HX/HG/HE C200HS
Master Unit CVM1-DRM21-V1 C200HW-DRM21-V1
Supported communications Remote I/O and
messages
Max. No of Slaves per Master Unit
Max. No. of controlled points
per Master Unit
Allocation areas
63 63 63
6,400 (100 words
4 blocks)
Core I/O Area:
CIO 0000 to
CIO 2555
CIO 0000 to
CIO 2427 for
CV500/CVM1-CPU
01(-Vj)
CPU Bus Link
Area:
G008 to G255
DM Area:
D00000 to
D24575
D00000 to
D08191 for
CV500/CVM1-CPU
01 (-Vj)
Remote I/O and messages
Without messages:
4,800
With messages: 1,600
IR Area 1: IR 000 to IR 235
IR Area 2: IR 300 to IR 511
HR Area: HR 00 to HR 99
LR Area: LR 00 to LR 63
DM Area:
DM 0000 to DM 5999
DM 0000 to DM 4095
for C200HE-CPU11 (-Z)
Remote I/O
1,280 (total of 4 blocks)
DM Area:
DM 0000 to DM 5999
1-11
Functions and System Configuration Chapter 1
Applicable PC C200HSC200HX/HG/HECV-series
Allocation method Words are allocated to each node in the above data areas in any order
using the Configurator.
The following limitations apply:
The allocation areas are in 4 blocks (OUT 1, OUT 2, IN 1, and
IN 2). Each block consists of sequential words.
100 words max. per block.
For Slaves with more than 8 points, the first byte cannot be
specified in leftmost bits (7 to 15).
Words are allocated to Slaves as follows:
8-point Slaves: Allocated leftmost or rightmost byte of 1 word
16-point Slaves:Allocated 1 word
Slaves with more than 16-points: Allocated multiple words (For Slaves
with an odd number of bytes, the last byte will be the rightmost byte)
Max. No. of
Inverters
(using one
Master Unit
only)
Max. No. Inverters with more
than one Master Unit
Without explicit messages
With explicit
messages
63 4 remote I/O words: 63
6 remote I/O words: 50
63 4 remote I/O words: 25
6 remote I/O words: 16
Calculate from the number of words allocated in the data areas and the
number of words allocated to the Inverters (4 or 6 words).
Note 1. The DM Area cannot be manipulated by bit, so it cannot be allo-
cated for remote I/O for Inverters.
Note 2. If the CPU Bus Link is used with a CV-series PC, the CPU Bus
Link Area will be used for the CPU Bus Link Therefore, the CPU
Bus Link Area cannot be allocated to Inverters if the CPU Bus
Link is used.
4 words remote I/O: 20
6 words remote I/O: 13
---
1-12
2
Chapter 2
CompoBus/D
Communications Line
Design
2-1 Network Configuration Overview
2-2 Network Configuration Restrictions
2-3 Communications Power Supply
2-4 Communications Line Noise Prevention
CompoBus/D Communications Line Design Chapter 2 2-1 Network Configuration Overview
The following diagram shows the configuration of a CompoBus/D Network.
Terminating Resistors
are connected at each
end of the trunk line.
CompoBus/D
cables are used.
Trunk line Trunk line Trunk line
TT TT
Node
T-branch
Tap
Drop line
Drop line Drop line
Node
T-branch
Tap
Node
Drop line
M
Drop line
M
Communications
power supply
24 VDC
T-branch
Tap
Node
Node
Drop line
CompoBus/D
cables are used.
Power Supply Tap
or T-branch Tap
T-branch
Tap
T-branch Tap
T
Drop line
M
Node
Node
Trunk
MM
line
Node
Node
CompoBus/D cables (5-wire cables) are
used for the trunk lines and drop lines.
Terminating Resistors
are connected at each
end of the trunk line.
Trunk line Trunk line
T
Node
T: T-branch connection
M: Multi-drop connection
T-branch
Tap
2-1-1 Network Components
H Nodes
There are two kinds of nodes on a CompoBus/D Network: The Master and Slaves. The Slaves connect
to external I/O and the Master administers the Network and manages the external I/O of the Slaves. The
Master and Slaves can be connected at any location in the Network, as shown in the preceding diagram.
H Trunk/Drop Lines
The trunk line refers to the cable that has Terminating Resistors on both ends. Cables branching from
the trunk line are known as drop lines. The trunk line length does not necessarily coincide with the maximum length of the Network. CompoBus/D communications are transmitted through 5-wire cables. The
cables come in thick and thin versions.
H Connection Methods
Two methods can be used to connect CompoBus/D nodes: The T-branch method and the multi-drop
method. With the T-branch method, the node is connected to a drop line created with a T-branch Tap.
With the multi-drop method, the node is directly connected to the trunk line or the drop line. Secondary
branches can be made from a drop line. Both of these connection methods can be used in the same
Network.
H Terminating Resistors
Terminating Resistors are connected at each end of the trunk line to reduce signal reflection and stabilize communications. There are two kinds of Terminating Resistors available: One that is provided with
a T -branch T a p and a Terminal-block Terminating Resistor. Use a CompoBus/D Cable when connecting
a Terminal-block Terminating Resistor.
H Communications Power Supplies
To use CompoBus/D, connect a communications power supply to the communications connector of
each node with a 5-wire cable. Basically, a communications power supply, internal circuit power supply,
and I/O power supply must be provided separately.
2-2
CompoBus/D Communications Line Design Chapter 2 2-1-2 Connections
H Trunk and Drop Lines
The trunk line is a cable to which Terminating Resistors are connected at the ends. Drop lines are cables
that branch from the trunk lines. A special 5-wire cable is used for both the trunk lines and the drop lines.
H Branching Patterns
Branching Patterns from Trunk Line
1.One drop line from
trunk line
Trunk line
Drop line
Node
Trunk line
T-branch Tap
2.Three drop lines (maximum)
from trunk line
Trunk line
Node
Node
Trunk line
T-branch Tap
T-branch Tap
Node
3.Node connected directly to
trunk line
Trunk line
Multi-drop
Node
Trunk line
Branching Patterns from Drop Line
4 One drop line from
drop line
Trunk line
Drop line
Node
Trunk line
T-branch Tap
Various forms of connection can be used on the same Network, as shown in the
following diagram. Any number of nodes up to 63 can be connected onto a single
drop line.
If a C200HX/HG/HE or a C200HS PC is being used without a Configurator to
allocate remote I/o, the maximum number of nodes that can be connected to a
single drop line is 51 for C200HX/HG/HE PCs and 33 for C200HS PCs.
Note Design the Inverter wiring for T -branch wiring purposes using Thin
Terminating
Resistor
5.Three drop lines (maximum)
from drop line
Trunk line
Cables.
Node
Trunk line
Drop
line
Node
Node Node
Trunk line
T-branch Tap
T-branch Tap
Node
24 VDC
NodeNode
6.Node connected directly to
drop line
Trunk line
Communications
power supply
Power Supply Tap
or T-branch Tap
Drop line
Node
Multi-drop
Node
Trunk line
Node
Trunk line
Drop
line
Node
Terminating
Resistor
Node
Node
Node
2-3
CompoBus/D Communications Line Design Chapter 2 2-2 Network Configuration Restrictions
CompoBus/D communications are designed to meet a wide range of applications by providing a choice
of baud rates and allowing different combinations of T-branch and multi-drop connections. The restrictions of CompoBus/D communications that are required to enable the various communications possibilities are described here.
2-2-1 Baud Rate and Communications Distance
The maximum length of the CompoBus/D communications cables is restricted by the baud rate and the
type of cable used. The three types of restrictions on CompoBus/D communications cable length are as
follows:
S Maximum network length
S Drop line length
S Total drop line length
Be sure to design and configure a Network that meets the conditions provided below to ensure reliable communications.
H Maximum Communications Distance
Baud rate
500 kbps 100 m max. 100 m max. 6 m max. 39 m max.
250 kbps 250 m max. 100 m max. 6 m max. 78 m max.
125 kbps 500 m max. 100 m max. 6 m max. 156 m max.
Note Thick Cable (5-wire): DCA2-5C10 (100 m)
Thin Cable (5-wire): DCA1-5C10 (100 m)
Maximum network length
Thick Cable Thin Cable
Drop line length Total drop line
length
H Maximum Network Length
The length of the Network is longest at either the distance between the two most distant nodes or at the
distance between the Terminating Resistors.
There are two types of cables: Thick Cables and Thin Cables. The cable thickness affects signal deterioration. The maximum length of the Network therefore depends on the type of cable used as shown in
the previous table.
The following restrictions apply to Networks in which both Thick and Thin Cables are combined.
Baud rate Maximum Network length
500 kbps
250 kbps
125 kbps
Thick Cable length + Thin Cable length x 100 m
Thick Cable length + 2.5 Thin Cable length x 250 m
Thick Cable length + 5.0 Thin Cable length x 500 m
H Drop Line Length
The length of the drop line is measured from the point in the trunk line where the original branch was
made to the end of the branch. The maximum length of a drop line is 6 m. It is possible to make a secondary branch from a drop line.
2-4
CompoBus/D Communications Line Design Chapter 2
H Total Drop Line Length
The total drop line length is the total sum length of all the drop lines (but not including the trunk line). Do
not exceed the maximum total drop line length (even when the length of each individual drop line is 6 m
or less). The standard for the total drop line length varies with the baud rate as shown in the previous
table.
H Configuration Example
The following configuration example shows the maximum length of the Network, the drop line lengths,
and the total drop line length.
Terminating
Resistor
Maximum Network
Length
Drop Line Length
Node
Trunk line
10 m
2 m
1 m
Node
Node
Drop line
2m
The longest distance between nodes is 48 m, and the distance between the two
Terminating Resistors is 40 m. The maximum Network length is therefore 48 m.
There are four branch points in the trunk line. The length of each drop line is
3 m
2 m
Drop line
5 m
Trunk line
10 m
2 m
Node
6 m
Node
2 m
2 m
1 m
Drop line
6 m
Node
Node
shown in the diagram. The maximum drop line length is 6 m.
Total Drop Line Length
The sum of all the drop lines is 40 m.
2-2-2 Locating Terminating Resistors
Trunk line
20m
1 m
Node
6 m 6 m 6 m
Node Node Node
Drop line
6 m
Terminating
Resistor
Be sure to connect the Terminating Resistors at both ends of the trunk line to reduce signal reflection
and stabilize communications.
When there is a T-branch Tap 6 m or less from the end of the trunk line (or the node):
A Terminating Resistor attached to a T-branch Tap can easily be mounted without taking up much
space.
When there is not a T-branch Tap 6 meters or less from the end of the trunk line (or the node):
A Terminating Resistor must be connected before that point. Either a T-branch Tap mounted to a
Terminating Resistor or a terminal block with Terminating Resistor can be used. In this case, be sure
to make the cable length 1 m or less from the node to the Terminating Resistor.
1 m or less
Truck line
Node
Node at end of trunk line
T-branch Tap mounted to a Terminating Resistor
or a terminal block with Terminating Resistor.
2-5
CompoBus/D Communications Line Design Chapter 2 2-3 Communications Power Supply
2-3-1 Locating the Communications Power Supply
H Basic Concept
•The communications power supply must be 24 VDC.
•Make sure that the power is supplied from the trunk line.
•When providing power to several nodes from one power supply, if possible try to locate the nodes in
both directions from the power supply.
•Provide power through Power Supply T aps. It is, however, possible to use T -branch Taps instead when
there is one communications power supply in the system and the total current consumption is less
than 5 A.
•The power supply capacity for cables is restricted to 8 A for Thick Cables and 3 A for Thin Cables.
•A single Network is usually supplied by one power supply. It is, however , possible to have more than
one power supply when power supply specifications cannot be met with a single power supply. (See
2-3-4 Step 3: Splitting the System into Multiple Power Supplies.)
•Fully consider the power supply capacity allowance in the design.
•If the power supply is switched OFF during the operation of the Network, there may be a malfunction in
the nodes.
•The current capacity of the drop line varies according to its length. The longer the drop line, the lower
its maximum capacity becomes. This is the same whether the cable is thick or thin. Calculate the current capacity passing through the drop line I (the total current consumption at the drop line) using the
following formula.
I = 4.57/L I: Permissible current (A)
L: Length of the drop line (m)
2-6
CompoBus/D Communications Line Design Chapter 2
H Flowchart
Use the flowchart below to determine the communications power supply on the trunk line. Satisfy the
conditions for each drop line on page 2-6.
Provisionally determine the
location of the power supply.
Step 1
Determine the best location of the
power supply from the graphs.
Are the power supply
specifications met?
Yes
No
Consider changing the
location of the power supply.
Consider using Thick Cable.
Are the power supply
specifications met?
Yes
Calculate the best location
of the actual nodes.
No
Step 2
Are the power supply
specifications met?
Consider changing the location of
Yes
the power supply.
Consider using Thick Cable.
Consider changing the location of
high current consumption nodes.
No
No
Step 3
Set the location for
the power supply.
Are the power supply
specifications met?
Yes
Split the power supply
system by installing more
than two power supplies.
H Power Supply Location Patterns
The power supply can be located in the configurations shown below. Basically, select from the configurations 1 and 2.
Consider using configuration 3 when power supply specifications cannot be met by configurations 1
and 2. It is possible to use configuration 4 for a duplex power supply.
2-7
CompoBus/D Communications Line Design Chapter 2
1 Locating the Nodes on Both Sides of the Power Supply
Power Supply Tap
or T-branch Tap
Node Node Node Node Node
Communications
power supply
2 Locating the Nodes on One Side of the Power Supply
Note Configuration 1 is recommended for a single power supply to several nodes.
Power Supply Tap
or T-branch Tap
Communications
power supply
Node Node Node Node Node
3 Splitting the Power Supply System with Multiple Power Supplies
Special Power Supply Tap
Communications
power supply
System 1
Special Power Supply Tap
Node Node Node Node Node
Communications
power supply
System 2
Remove the fuse
and split +V.
V+
V–
fuse
24 V 0 V
Make –V the same for
Systems 1 and 2.
4 Duplex Power Supply with Multiple Power Supplies
Special Power
Supply Tap
Communications
power supply
Node Node Node Node
Node
Special Power
Supply Tap
Communications
power supply
Note 1. If power supply specifications cannot be met with a single power supply when the current ca-
pacity of the Thick Cable exceeds 8 A even after the power supply location is modified, use
more than one communications power supply.
Note 2. In configuration 1, the power can be supplied in two directions to the trunk line as long as the
current capacity of each is 8 A or less when using Thick Cable, i.e., it is possible to have a
configuration with a total maximum current capacity of up to 16 A.
2-8
CompoBus/D Communications Line Design Chapter 2
Note 3. Consider changing to Thick Cable to meet specifications if the current capacity of the Thin
Cable exceeds 3 A when using Thin Cable for the trunk line.
H Setting the Power Supply Location
Determine whether or not the current can be supplied normally by finding the current capacity required
by each node and the voltage drop in the cables to be used to provide power. Calculate the values below
in advance.
•The current capacity required by each node
•The distance between the power supply and each node
The current capacity of the 3G3FV-PDR T1-SIN CompoBus/D Communications Card is approximately
20 mA.
H Calculating the Power Supply Location
There are two methods to find the best location of the communications power supply on the trunk line.
•Simple calculation from a graph
•Calculation by formula (Calculating the voltage drop from resistance and current consumption of the
communications cables).
Each drop line must satisfy the equation on page 2-6, which represents the relationship between the
drop line length and the current capacity for the drop line.
Note 1. From the graph, a hypothetical power supply location can be determined if the conditions cal-
culated in the graph are met by estimating the worst configuration (that has the maximum voltage drop as shown in the diagram below).
Node
Node
Node
Communications
power supply
Node
Note 2. Even if the power supply specifications cannot be met using the graph, the conditions can be
met and a hypothetical power supply location determined by using the formula.
Note 3. When the communications power supply and the internal circuit supply are the same, use the
formula to calculate a hypothetical power supply location because it cannot be determined by
using the graph.
2-3-2 Step 1: Determining the Best Location for the Power
Supply from a Graph
A voltage drop occurs when a current flows through a communications cable. The longer the communications cable and the larger the current, the greater the voltage drop. The communications power
supply at each node must be 11 VDC or more. To ensure the correct power supply, the relationship is
plotted as shown in the following graph to find the maximum current that satisfies the voltage of the
communications power supply at different trunk line lengths even if there is a voltage drop due to cable
resistance.
2-9
CompoBus/D Communications Line Design Chapter 2
H Thick Cable
Distance (m) 0 25 50 100 150 200 250 300 350 400 450 500
Max. current (A) 8.00 8.00 5.42 2.93 2.01 1.53 1.23 1.03 0.89 0.78 0.69 0.63
8
7
6
Max. current (A)
5
4
3
2
1
0
0
Distance (m)
H Thin Cable
Distance (m) 0 10 20 30 40 50 60 70 80 90 100
Max. current (A) 3.00 3.00 3.00 2.06 1.57 1.26 1.06 0.91 0.80 0.71 0.64
3
2
Max. current (A)
1
0
0
Distance (m)
H Determining the Best Location of the Power Supply from a Graph
Verify the Items 1 to 3 below for each node located in the same direction viewed from the power supply.
Therefore, if nodes are located on both sides of the power supply, these items must be verified for all
nodes located in each direction.
1 Find A, the total current consumption of all the nodes to which communications power is to be sup-
plied.
2 Using the graph compute B, the maximum current flow in each cable from the power supply to the
end of the trunk line according to the types of cables (Thick Cables or Thin Cables).
2-10
CompoBus/D Communications Line Design Chapter 2
3 Compare the values found in steps 1 and 2, above. If the first value (A) is less than the second (B),
this shows that power supply specifications are met and power can be supplied to all nodes at any
point in the Network.
Note Be sure to refer to the correct graph as the maximum current flow is different for Thick and Thin
Cables.
H Countermeasures
If the second value (B) is less than the first (A), use the following procedure to locate the communications power supply.
•Locate the communications power supply in the center of the Network and the nodes to both sides of it.
•If the nodes are already located at both sides of the power supply, move the power supply in the direc-
tion that requires the larger current capacity.
•If Thin Cable is being used, replace it with Thick Cable.
Note If, after following the above procedure, B is still less than A, go to Step 2 and determine the actual
position of the nodes by the formula calculation method.
D Calculation Example
The following example shows a Network that requires power to be supplied for 240 m on Thick Cable.
The power supply is located in the center of the Network. Because the power supply is in the center, the
maximum current will flow both to the left and to the right, enabling the supply of at least twice the maximum current as when the power supply is placed on the end of the Network. The current consumption
for individual nodes is as follows:
120 m
Trunk line
(5-wire cable)
Terminating Resistor Trunk line
Node
0.1 A
(5-wire cable)
Node Node Node Node Node
0.25 A 0.2 A 0.15 A 0.25 A 0.15 A
120 m
3 m max.
Communications
power supply
Trunk line
Power supply cable
Total power supply length on left = Total power supply length on right = 120 m
Total current consumption on left: 0.1 + 0.25 + 0.2 = 0.55 A
Total current consumption on right: 0.15 + 0.25 + 0.15 = 0.55 A
Maximum current for the left side of the Thick Cable (see previous table) = approx. 2.5 A
Maximum current for the right side of the Thick Cable (see previous table) = approx. 2.5 A
(using straight line approximation between 100 to 150 m)
Terminating Resistor
2-3-3 Step 2: Calculating the Best Location of the Actual
Nodes
Go to Step 2 if the best location for the power supply according to the specifications cannot be determined from the graphs. The second method calculates the best location for each actual node and does
not estimate the worst possible configuration for the power supply.
2-11
CompoBus/D Communications Line Design Chapter 2
Basically , i n the CompoBus/D Network the permissible maximum voltage drop within the system can be
specified at 5 V for a power supply line (+V or –V), by calculating the specifications for the voltage of the
communications power supply (24 VDC) and the input voltage of the communications power supply of
each device (11 to 25 VDC).
Of the permissible 5-V maximum voltage drop within the system, the permissible voltage drop is 4.65 V
in the trunk lines and 0.35 V in the drop lines.
The following formulae are applicable when power is supplied independently for communications
and the internal circuit. For details on voltage drop and formulae when the communications power
supply and internal circuit power supply are shared, refer to the CompoBus/D (DeviceNet) Opera-
tion Manual.
H Formulae
Try to calculate the best location for each node using the formula below. If the best location for each
node can be determined using the formula, the specifications for the power supply to each node can
also be met. Do not exceed the maximum current capacity of the cable (Thick Cable: 8 A and Thin
Cable: 3 A).
{(L
× RC + N1 × 0.005) × l1} + {(L2 × RC + N2 × 0.005) × l2} + . .... + { (Ln × RC + Nn × 0.005) × ln} x 4.65 V
1
Li: The distance (m) of the trunk line between the power supply and node i.
Rc: Maximum cable resistance for approx. 1 m
(Thick Cable: 0.015 Ω/m, Thin Cable: 0.069 Ω/m)
Ni: The number of T-branch Taps on the trunk line between the power supply and node i.
Ii: The consumption current required for the communications power supply for node i.
0.005 Ω = The contact resistance of the T-branch Taps.
Note If there are nodes on both sides of the power supply, the formula is used to calculate the best
location in each direction, and if the conditions are satisfied, then the locations are valid. The
conditions are satisfied if the following equations are true.
Voltage drop (V) on trunk line at left side x 4.65 V
Voltage drop (V) on trunk line at right side x 4.65 V
D Calculation Example
Node
0.1 A
Trunk line
(5-wire cable)
3 m
max.
Node Node Node Node Node
0.25 A 0.2 A 0.15 A 0.25 A 0.15 A
40 m
40 m
Communications
power supply
40 m
40 m
(5-wire cable)
40 m
Terminating ResistorTerminating Resistor Trunk line
40 m
Left Side Equation
Node 1: (120 0.015 + 3 0.005) 0.1 = 0.1815 (V)
Node 2: (80 0.015 + 2 0.005) 0.25 = 0.3025 (V)
Node 3: (40 0.015 + 1 0.005) 0.2 = 0.121 (V)
If 0.1815 + 0.3025 + 0.121 = 0.605 V x 4.65 V, the conditions are satisfied.
2-12
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