YOKOGAWA IR202 User manual

User’s
Manual Model IR202
Infrared Gas Analyzer
Communication Functions
(MODBUS)
IM 11G02Q02-51EN
IM 11G02Q02-51EN
2nd Edition

i
<PREFACE>
IM 11G02Q02-51EN 2nd Edition : Sep. 04, 2020-00
uPREFACE
We are grateful for your purchase of Yokogawa’s Infrared Gas Analyzer, Model: IR202. Read this
instruction manual carefully.
The document numbers of related documents are as follows.The “EN” in the document number
is the language code, meaning English.
GeneralSpecications:GS11G02Q02-01EN
User’s Manual: IM 11G02Q02-01EN
IM 11G02Q02-51EN Communication Functions (MODBUS)
(This manual)
IM 11G00E01-01EN ZX8D Zirconia Oxygen Analyzer
Media No.IM 11G02Q02-51EN 2nd Edition :Sep. 2020 (YK)
All Rights Reserved Copyright © 2017, Yokogawa Electric Corporation

ii
<PREFACE>
IM 11G02Q02-51EN 2nd Edition : Sep. 04, 2020-00
uSafety Precautions
nSafety,Protection,andModicationoftheProduct
• In order to protect the system controlled by the product and the product itself and ensure
safe operation, observe the safety precautions described in this user’s manual. We assume
no liability for safety if users fail to observe these instructions when operating the product.
• Ifthisproductisusedinamannernotspeciedinthisuser’smanual,theprotection
provided by this product may be impaired.
• If any protection or safety circuit is required for the system controlled by the product or for
the product itself, prepare it separately.
• Be sure to use the spare parts approved by Yokogawa Electric Corporation (hereafter
simply referred to as YOKOGAWA) when replacing parts or consumables.
• Modicationoftheproductisstrictlyprohibited.
• The following safety symbols are used on the product as well as in this manual.
WARNING
This symbol indicates that an operator must follow the instructions laid out in this manual in
order to avoid the risks for the human body and health including risk of injury, electric shock, or
fatalities. or the damages to products. The manual describes what special care the operator must
take to avoid such risks.
CAUTION
This symbol indicates that the operator must refer to the instructions in this manual in order
to prevent the product (hardware) or software from being damaged, or a system failure from
occurring.
The following are signal words to be found only in our instruction manuals.
CAUTION
This symbol gives information essential for understanding the operations and functions.
NOTE
This symbol indicates information that complements the present topic.
nNotes on Handling User’s Manuals
• Please hand over the user’s manuals to your end users so that they can keep the user’s
manuals on hand for convenient reference.
• Please read the information thoroughly before using the product.
• The purpose of these user’s manuals is not to warrant that the product is well suited to any
particular purpose but rather to describe the functional details of the product.
• No part of the user’s manuals may be transferred or reproduced without prior written
consent from YOKOGAWA.
• YOKOGAWA reserves the right to make improvements in the user’s manuals and product at
any time, without notice or obligation.
• Ifyouhaveanyquestions,oryoundmistakesoromissionsintheuser’smanuals,please
contact our sales representative or your local distributor.

iii
<PREFACE>
IM 11G02Q02-51EN 2nd Edition : Sep. 04, 2020-00
nDrawing Conventions
Somedrawingsmaybepartiallyemphasized,simplied,oromitted,fortheconvenienceof
description.
Somescreenimagesdepictedintheuser’smanualmayhavedi󰀨erentdisplaypositionsor
character types (e.g., the upper / lower case). Also note that some of the images contained in this
user’s manual are display examples.
n AuthorizedRepresentativeinEEA
The Authorized Representative for this product in EEA is Yokogawa Europe B.V. (Euroweg 2,
3825 HD Amersfoort, The Netherlands).
n Trademarkpolicy
• All names of company, brand of product used in this manual are registered trademarks.
• TM or ® to signify brand or trademarks are not used in this manual.

iv
<PREFACE>
IM 11G02Q02-51EN 2nd Edition : Sep. 04, 2020-00
uAfter-Sales Warranty
 Donotmodifytheproduct.
 Yokogawawarrantstheproductfortheperiodstatedinthepre-purchase
quotation.Yokogawashallconductdenedwarrantyservicebasedonits
standard.Whenthecustomersiteislocatedoutsideoftheservicearea,afee
fordispatchingthemaintenanceengineerwillbechangedtothecustomer.
 Duringthewarrantyperiod,forrepairunderwarrantycarryorsendtheproduct
tothelocalsalesrepresentativeorserviceo󰀩ce.Yokogawawillreplaceor
repairanydamagedpartsandreturntheproducttoyou.
Before returning a product for repair under warranty, provide us with the model name
and serial number and a description of the problem. Any diagrams or data explaining the
problem would also be appreciated.
If we replace the product with a new one, we won’t provide you with a repair report.
 Inthefollowingcases,customerwillbechargedrepairfeeregardlessof
warrantyperiod.
Failure of components which are out of scope of warranty stated in instruction manual.
Failure caused by usage of software, hardware or auxiliary equipment, which Yokogawa did
not supply.
Failureduetoimproperorinsu󰀩cientmaintenancebyuser.
Failureduetomisoperation,misuseormodicationwhichYokogawadoesnotauthorize.
Failureduetopowersupply(voltage,frequency)beingoutsidespecicationsorabnormal.
Failure caused by any usage out of scope of recommended usage
Anydamagefromre,earthquake,astormandood,lightning,disturbance,riot,warfare,
radiation and other natural changes.
 Yokogawadoesnotwarrantconformancewiththespecicapplicationatthe
usersite.Yokogawawillnotbeardirect/indirectresponsibilityfordamagedue
toaspecicapplication.
 Yokogawawillnotbearresponsibilitywhentheusercongurestheproduct
intosystemsorresellstheproduct.
 Maintenanceserviceandsupplyingrepairpartswillbecoveredforveyears
aftertheproductionends.Forrepairthisproduct,pleasecontactthenearest
saleso󰀩cedescribedinthisinstructionmanual.

i
<CONTENTS>
IM 11G02Q02-51EN 2nd Edition : Sep. 04, 2020-00
Model IR202
Infrared Gas Analyzer
Communication Functions (MODBUS)
CONTENTS
IM 11G02Q02-51EN 2nd Edition
uPREFACE........................................................................................................i
uSafety Precautions.......................................................................................ii
uAfter-Sales Warranty...................................................................................iv
1. GENERAL.................................................................................................. 1-1
2. CONNECTION........................................................................................... 2-1
3. MODBUSPROTOCOL.............................................................................. 3-1
3.1 Compositionofmessage................................................................................. 3-1
3.2 Responseofslavestation................................................................................ 3-2
3.3 Functioncode.................................................................................................... 3-3
3.4 Calculationoferrorcheckcode(CRC-16)..................................................... 3-4
3.5 Transmissioncontrolprocedure..................................................................... 3-6
4. DETAILSOFMESSAGE........................................................................... 4-1
4.1 Read-outworddata(Functioncode:03H)..................................................... 4-1
4.2 Read-outworddata(Read-outonly)(Functioncode:04H).......................... 4-2
4.3 Write-inworddata(1word)(Functioncode:06H)....................................................... 4-4
4.4 Write-incontinuousworddata
(Functioncode:10H)........................................................................................ 4-5
5. ADDRESSMAPANDDATAFORMAT..................................................... 5-1
5.1 Dataformat........................................................................................................ 5-1
5.1.1 Handling of decimal point position and measurement unit................ 5-1
5.1.2 Handling at measurement data over-range....................................... 5-2
5.2 Addressmap..................................................................................................... 5-3
5.3 Supplementtoaddressmap.......................................................................... 5-16
6. TROUBLESHOOTING............................................................................. 6-1
Revision Information...............................................................................................i

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<1. GENERAL> 1-1
IM 11G02Q02-01EN 2nd Edition : Sep. 04, 2020-00
1. GENERAL
This product provides a communication function through RS-485 interface, which allows data
transmit to or receive from the host computer and other devices.
The communication system is comprised of a master station and slave stations. Up to 31 of slave
station (present instrument) can be connected per master station (host computer, programmable
controller, graphic display panel, etc.) through RS-485 interface.
Because the master station can communicate with only one slave station at a time, the
destinationcanbeidentiedbythe“StationNo”setforeachslavestation.
In order that the master station and the slave station can communicate, the format of the
transmit/receive data must coincide. The format of the communication data is determined by the
MODBUS protocol
[RS-232 <=> RS-485 converter] (recommended )
Type: KS-485 (non-isolated type)/SYSTEM SACOM Corp.
Type: SI-30FA (isolated type)/SEKISUI ELECTRONICS Co., Ltd.
[USB <=> RS-485 converter] (recommended article)
Type: USB-485I / SYSTEM SACOM Corp.
RS-485 USB RS-485
RS-232C RS-485
RS-485
Programmable controller
Converter
IR202 IR202
RS-232C or USB
Figure1.1 Congurationbetweenmasterandslavedevices

<1. GENERAL> 1-2
IM 11G02Q02-01EN 2nd Edition : Sep. 04, 2020-00
l RS-485Interface
Electricalspecication: BasedonEIARS-485
Transmission system : 2-wire, semi-duplicate
Synchronizing system : Start-stop synchronous system
Connection format : 1*N
Maximum connectable units : 31 units
Transmission distance : 500 m max.(total extension distance)
Transmission speed : 38400 bps
Data format
Data length ; 8 bits
Stop bit ; 1 bit
Parity ; None
 Xowcontrol; None
Transmission code : HEX value (MODBUS RTU mode)
Error detection : CRC-16
Isolation : Isolation from internal circuit
Functional isolation between signal line and ground

<2.CONNECTION> 2-1
IM 11G02Q02-01EN 2nd Edition : Sep. 04, 2020-00
2. CONNECTION
WARNING
Do not turn on the power supply until all wiring have been completed, otherwise electric shock or
malfunctions may occur.
n RS-485Interface
The terminal allocation of RS-485 (at the rear panel)
5 4 3 2
9 8 7 6
1
1: Signal ground
2: RTxD+
3: RTxD-
4 to 9: NC
9-pin D-Sub (female)
RS-485 interface requires
• Use a shielded twist pair cable. (Recommended cable: KPEV-SB (made by The Furukawa
Electric Co., Ltd.))
• The maximum cable length should be 500m. One master and up to thirty-one micro
controllers (slaves) can be connected per circuit.
• Terminatebothendsofthecircuitwithaterminatingresistanceof100Ω(1/2Wormore).
• Ground the shielded cable once towards the master side