Mitsubishi QJ71C24, QJ71E71-B5, QJ71C24-R2, QJ71E71-100, QJ71E71-B2 Reference Manual

...

 SAFETY PRECAUTIONS 

(Always read these instructions before using this equipment.)

Before using this product, please read this manual and the relevant manuals introduced in this manual carefully and pay full attention to safety to handle the product correctly. The instructions given in this manual are concerned with MELSEC communication protocol. For the safety instructions of the programmable controller system, please read the user's manual for the CPU module to use.

In this manual, the safety instructions are ranked as "

WARNING

CAUTION

Note that the Always follow the instructions of both levels because they are important to personal safety.

Please save this manual to make it accessible when required and always forward it to the end user.

CAUTION level may lead to a serious consequence according to the circumstances.

Indicates that incorrect handling may cause hazardous conditions, resulting in death or severe injury.

Indicates that incorrect handling may cause hazardous conditions, resulting in minor or moderate injury or property damage.

[Design Precautions]

WARNING" and "!CAUTION".

WARNING

 When changing data of the running programmable controller from a peripheral connected to the

CPU module or from a personal computer connected to an intelligent function module, configure an interlock circuit in the sequence program to ensure that the entire system will always operate safely. For program modification and operating status change, read relevant manuals carefully and ensure the safety before operation. Especially, when a remote programmable controller is controlled by an external device, immediate action cannot be taken if a problem occurs in the programmable controller due to a communication failure. To prevent this, configure an interlock circuit in the sequence program, and determine corrective actions to be taken between the external device and CPU module in case of a communication failure.

 Do not write any data to the "system area" of the buffer memory in the intelligent function

module. Also, do not use any "use prohibited" signals as an output signal from the programmable controller CPU to the intelligent function module. Doing so may cause malfunction of the programmable controller system.

A - 1 A - 1

[Operation Precautions]

CAUTION

 When changing data and operating status, and modifying program of the running programmable

controller from a personal computer connected to an intelligent function module, read relevant manuals carefully and ensure the safety before operation. Incorrect change or modification may cause system malfunction, damage to the machines, or accidents.

 While set values in the buffer memory are being registered to the flash ROM in the module, do

not turn off the power to the module and do not reset the CPU module. Doing so will affect the flash ROM data, and setting to the buffer memory and registration to the flash ROM need to be performed again. Also, it may cause failure or malfunction of the module.

A - 2 A - 2

 CONDITIONS OF USE FOR THE PRODUCT 

(1) Mitsubishi programmable controller ("the PRODUCT") shall be used in conditions;

i) where any problem, fault or failure occurring in the PRODUCT, if any, shall not lead to any major or serious accident; and ii) where the backup and fail-safe function are systematically or automatically provided outside of the PRODUCT for the case of any problem, fault or failure occurring in the PRODUCT.

(2) The PRODUCT has been designed and manufactured for the purpose of being used in general

industries. MITSUBISHI SHALL HAVE NO RESPONSIBILITY OR LIABILITY (INCLUDING, BUT NOT LIMITED TO ANY AND ALL RESPONSIBILITY OR LIABILITY BASED ON CONTRACT, WARRANTY, TORT, PRODUCT LIABILITY) FOR ANY INJURY OR DEATH TO PERSONS OR LOSS OR DAMAGE TO PROPERTY CAUSED BY the PRODUCT THAT ARE OPERATED OR USED IN APPLICATION NOT INTENDED OR EXCLUDED BY INSTRUCTIONS, PRECAUTIONS, OR WARNING CONTAINED IN MITSUBISHI'S USER, INSTRUCTION AND/OR SAFETY MANUALS, TECHNICAL BULLETINS AND GUIDELINES FOR the PRODUCT. ("Prohibited Application") Prohibited Applications include, but not limited to, the use of the PRODUCT in;  Nuclear Power Plants and any other power plants operated by Power companies, and/or any other

cases in which the public could be affected if any problem or fault occurs in the PRODUCT.

 Railway companies or Public service purposes, and/or any other cases in which establishment of a

special quality assurance system is required by the Purchaser or End User.

 Aircraft or Aerospace, Medical applications, Train equipment, transport equipment such as Elevator

and Escalator, Incineration and Fuel devices, Vehicles, Manned transportation, Equipment for Recreation and Amusement, and Safety devices, handling of Nuclear or Hazardous Materials or Chemicals, Mining and Drilling, and/or other applications where there is a significant risk of injury to the public or property.

Notwithstanding the above, restrictions Mitsubishi may in its sole discretion, authorize use of the PRODUCT in one or more of the Prohibited Applications, provided that the usage of the PRODUCT is limited only for the specific applications agreed to by Mitsubishi and provided further that no special quality assurance or fail-safe, redundant or other safety features which exceed the general specifications of the PRODUCTs are required. For details, please contact the Mitsubishi representative in your region.

A - 3 A - 3

REVISIONS

The manual number is given on the bottom left of the back cover.

Print Date Manual Number Revision

Dec., 1999 SH(NA)-080008-A First edition

Oct., 2000 SH(NA)-080008-B Reflect the contents of the function version B.

Put Windows base software products together from Mitsubishi Programmable Controller MELSEC series to Mitsubishi integrated FA software MELSOFT series. Standardize the name from software package (GPP function) to product name (GX Developer).

Correction

Contents, Entire manual (change MELSECNET/10H to MELSECNET/H), About Manuals, About the Generic Terms and Abbreviations, Section 1.1(5), Section 2.2, 2.4, 2.6, 2.7 (g), 2.9, 2.10, Section 3.1.1, 3.1.2 (figure), 3.1.3, 3.1.4 (figure), 3.1.5 (figure), 3.1.6 (5), REMARKS, 3.2 (table), 3.3.1 (table 6.3), 3.3.8 (POINT (screen)),

3.8.1 (2)(a), 3.8.2 (4), 3.8.5, 3.8.6, Section 4.1 (figure), Section 5.1.1,

5.1.2 (figure), 5.1.3, 5.1.5 (table)*3, 5.2.1 (2) (table), 5.2.8, 5.4.2, 5.4.3, Section 6.1.1, 6.1.2 (figure), 6.1.3, 6.2*3 (table), 6.3.1 (2) (table), 6.3.8 POINT (3), 6.4.9POINT (3), Appendix 1, 2

Jun., 2001 SH(NA)-080008-C Standardize the name from utility package (QSCU) to product name (GX

Configurator-SC).

Correction

About Manuals, The Manual's Use and Structure, About the Generic Terms and Abbreviations, Meanings and Descriptions of Terminology, Section 1.1(5), Section 2.2(table), 2.6.1(1)(table), 2.6.2(table), 2.10(4), Section 3.2(table), 3.3.1(table), 3.3.2, 3.3.3, 3.3.7, 3.3.8(2)(3),

3.3.9(2)(3)(4), 3.3.10(4), 3.4.3, 3.5, 3.6, 3.8.5(2), 3.8.16, 3.17.2, Section

4.4, Section 5.2.8(2)POINT, 5.5, Section 6.2

3, 6.3.1(2), Appendix 3.1

Addition

Section 2.11

Jan., 2003 SH(NA)-080008-D

Additional model

QJ71C24N,QJ71C24N-R2, QJ71C24N-R4

Correction

The Manual's Use and Structure, About the Generic Terms and Abbreviations, Section 1.1(5), Section 2.5(3), 2.6.1, 2.8, Section

3.1.2(1)(5), 3.1.3(3), 3.2, 3.3.1, 3.3.10(5)POINT, 3.5.2, 3.6.1POINT,

3.6.7, 3.13, Section 5.1.5, 5.2.1POINT, 6.1.2(1)

Apr., 2003 SH(NA)-080008-E

Additional model

QJ71E71-B5

Deleted model

QJ71E71

Correction

About the Generic Terms and Abbreviations, Section 2.6.1(2), Section

3.5.2, Section 6.1.3(4)

Jun., 2004 SH(NA)-080008-F

Correction

About the Generic Terms and Abbreviations, Section 2.6.1, 2.6.3,

2.10(4)(b), 3.1.3(2)(3), 3.1.6(5), 3.2, 3.3.1(3), 3.5.2(1), 3.6.7, 3.8.1,

3.8.11 POINT, Section 6.1.3(4), 6.3.1(2)

A - 4 A - 4

The manual number is given on the bottom left of the back cover.

Print Date Manual Number Revision

Aug., 2005 SH(NA)-080008-G

Correction

About the Generic Terms and Abbreviations, Meanings and Descriptions of Terminology, Section 2.7, Section 3.3.2 POINT

Addition

Chapter 3 (4E frame)

Jun., 2006 SH(NA)-080008-H

Jul., 2007 SH(NA)-080008-I

Correction

Section 3.2, 3.3.1, 3.3.8, 3.3.9, 3.5.2

Change of a term

"PLC" was changed to "programmable controller".

Correction

About the Generic Terms and Abbreviations, Section 1.2(2), Section

2.2, 2.4, 2.6.1, 2.6.2, 2.6.3, 2.9, 2.10(2)(4), Section 3.1.3(1), 3.1.6(5),

3.2*11, 3.3.1(3), 3.5.2(1), 3.13.1, 3.6.7, Section 5.1.3(4), Section

6.1.3(3), 6.3.1(2), Appendix 3.1

Nov., 2007 SH(NA)-080008-J

Aug., 2008 SH(NA)-080008-K

Correction

Section 1.1(5), 2.1(3), 2.6.1(1), 3.5.2, 5.1.5, 5.2.1(2), 6.2

Correction

About the Generic Terms and Abbreviations, Section 1.1, 1.2, Section

2.1, 2.2, 2.4 to 2.6, 2.8 to 2.11, 3.1.3, 3.1.6, 3.2, 3.3.1 to 3.3.10, 3.5.2,

3.6.7, 3.18, Section 5.1.3, 5.1.5, 5.2.1, Section 6.1.3, 6.2, 6.3.1, Appendix 1, 1.2, 1.3, 2

Addition

Section 2.12

Feb., 2009 SH(NA)-080008-L

Correction

About the Generic Terms and Abbreviations, Section 2.1(3), 2.6.1, Section 3.2*12, 3.5.2, 3.6.7, Section 5.1.5*7, 5.2.1, Section 6.2*7,

6.3.1*2

Jan., 2010 SH(NA)-080008-M

Additional model

LJ71C24, LJ71C24-R2

Correction

SAFETY PRECAUTIONS, RELEVANT MANUALS, MANUAL PAGE ORGANIZATION, GENERIC TERMS AND ABBREVIATIONS, TERMS, Section 2.6.1,

Section 3.1.6, 3.2, 3.3.1, 3.6.7, 3.8.1, 3.8.6, 3.8.7, 3.8.10, 3.8.12,

3.8.13, 3.8.15, 3.11.1, 3.13.1, Section 5.1.5, Appendix 1.3, 3.1

Addition

CONDITIONS OF USE FOR THE PRODUCT

Apr., 2010 SH(NA)-080008-N

Correction

GENERICTERMS AND ABBREVIATIONS, Section 1.1, 2.2, 2.6, 2.6.3,

2.9 to 2.11, 3.1.3, 3.1.6, 3.2, 3.3.2 to 3.3.10, 3.6.7, 5.1.3, 6.1.3, Appendix

1.3, 2

A - 5 A - 5

The manual number is given on the bottom left of the back cover.

Print Date Manual Number Revision

May, 2011 SH(NA)-080008-O

Correction

Section 2.1, 2.2, 2.6.1, 2.7.2, 3.1.3, 3.1.6, 3.2, 3.6.1, 3.7.3, 3.8, 3.8.1,

3.8.2, 3.8.9, 3.8.10, 3.8.11, 3.8.12, 3.8.13, 3.9.2, 3.9.3, 3.14, 4.3, 5.1.3,

5.1.5, Appendix 1.2

Jul., 2011 SH(NA)-080008-P

Oct., 2011 SH(NA)-080008-Q

Correction

Section 1.1, 2.6.1, 2.11, 3.6.7, 5.2.1, 6.3.1

Correction

Section 2.4, 2.6.1, 2.7.2, 2.8, 2.10, 2.12, 3.2, 3.3.1, 3.4.1, 3.11.1,

3.11.2, 3.18, 6.1.3, 6.2, 6.3.1, Appendix 3.1

Feb., 2013 SH(NA)-080008-R

Additional model

LJ71E71-100

Correction

RELEVANT MANUALS, GENERIC TERMS AND ABBREVIATIONS, TERMS, Section 2.6.1, 2.7.1, 3.2, 3.3.1, 3.6.7, 3.8.1, 3.8.7, 3.8.12,

3.8.13, 3.8.15, 6.2, Appendix 1.2, 3.1

Japanese Manual Version SH-080003-X

This manual confers no industrial property rights or any rights of any other kind, nor does it confer any patent licenses. Mitsubishi Electric Corporation cannot be held responsible for any problems involving industrial property rights which may occur as a result of using the contents noted in this manual.

 1999 MITSUBISHI ELECTRIC CORPORATION

A - 6 A - 6

INTRODUCTION

Thank you for purchasing the MELSEC-Q/L series programmable controller. This manual describes the functions of the MELSEC-Q/L series programmable controllers. Before using this product, please read this manual and the relevant manuals carefully and develop familiarity with the functions and performance of the MELSEC-L series programmable controller to handle the product correctly. Please always forward this manual to the end user.

SAFETY PRECAUTIONS ........................................................................................................................A- 1

CONDITIONS OF USE FOR THE PRODUCT .......................................................................................A- 3

REVISIONS ..............................................................................................................................................A- 4

INTRODUCTION......................................................................................................................................A- 7

RELEVANT MANUALS............................................................................................................................A- 13

MANUAL PAGE ORGANIZATION ..........................................................................................................A- 15

GENERIC TERMS AND ABBREVIATIONS ...........................................................................................A- 17

TERMS .....................................................................................................................................................A- 19

1 OVERVIEW 1- 1 to 1- 4

1.1 Overview of the MELSEC Communication Protocol............................................................................ 1- 1

1.2 Features of the MELSEC Communication Protocol ............................................................................ 1- 3

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL 2- 1 to 2- 34

2.1 Types and Applications of Data Communication Frames ...................................................................2- 1

2.2 Accessible Range of Each Data Communication Frames .................................................................. 2- 3

2.3 How to Read the Control Procedures of the MC Protocol................................................................... 2- 5

2.4 Access Timing of the Programmable Controller CPU Side ................................................................. 2- 6

2.5 Setting Method for Writing to the Programmable Controller CPU during RUN .................................. 2- 8

2.6 Accessing Other Stations ..................................................................................................................... 2- 9

2.6.1 Accessible programmable controllers of other stations ................................................................ 2- 9

2.6.2 Example of accessible station when each frame is used .............................................................2- 12

2.6.3 Example of designating data items for accessing other station designated within each data

communication frame .................................................................................................................... 2- 16

2.7 Precautions on Data Communication................................................................................................... 2- 19

2.7.1 When using E71 ............................................................................................................................. 2- 19

2.7.2 When using C24............................................................................................................................. 2- 21

2.8 Time Chart and Communication Time of the Transmission Sequence of

the Serial Communication Module ....................................................................................................... 2- 22

2.9 Transmission Time When Accessing Other Stations via CC-Link IE Controller Network,

CC-Link IE Field Network, MELSECNET/H, MELSECNET/10 ........................................................... 2- 25

2.10 Compatibility with Multiple CPU Systems .......................................................................................... 2- 28

2.11 Compatibility with the Serial Communication Function in the CPU Module ..................................... 2- 32

2.12 Compatibility with Programmable Controller CPU with Built-In Ethernet Port.................................. 2- 34

A - 7 A - 7

3 WHEN COMMUNICATING USING THE QnA COMPATIBLE 3E/3C/4C FRAMES OR 4E FRAME

3- 1 to 3- 303

3.1 Message Formats .................................................................................................................................3- 2

3.1.1 How to read the command description sections ...........................................................................3- 2

3.1.2 Message format and control procedures of QnA compatible 3E frame and 4E frame................ 3- 3

3.1.3 Data designation items for QnA compatible 3E frame and 4E frame .......................................... 3- 13

3.1.4 Message formats and control procedures of QnA compatible 3C frame ..................................... 3- 16

3.1.5 Message formats and control procedures of QnA compatible 4C frame ..................................... 3- 25

3.1.6 Data designation items for QnA compatible 3C/4C frames.......................................................... 3- 36

3.1.7 Character area transmission data ................................................................................................. 3- 49

3.2 List of Commands and Functions for the QnA Compatible 3E/3C/4C Frames and 4E Frame.......... 3- 54

3.3 Device Memory Read/Write.................................................................................................................. 3- 62

3.3.1 Commands, character area contents and device range............................................................... 3- 62

3.3.2 Multiple block batch read and batch write .....................................................................................3- 76

3.3.3 Batch read in bit units (command: 0401)....................................................................................... 3- 85

3.3.4 Batch write in bit units (command: 1401) ......................................................................................3- 87

3.3.5 Random write in bit units (test) (command: 1402) ........................................................................ 3- 89

3.3.6 Batch read in word units (command: 0401) ..................................................................................3- 91

3.3.7 Batch write in word units (command: 1401) .................................................................................. 3- 95

3.3.8 Random write in word units (test) (command: 1402) .................................................................... 3- 99

3.3.9 Random read in word units (command: 0403).............................................................................. 3-102

3.3.10 Monitoring device memory........................................................................................................... 3-120

3.4 Buffer Memory Read/Write ...................................................................................................................3-129

3.4.1 Commands and buffer memory .....................................................................................................3-129

3.4.2 Reading buffer memory (command: 0613) ................................................................................... 3-131

3.4.3 Writing to buffer memory (command: 1613).................................................................................. 3-133

3.5 Reading from and Writing to the Buffer Memory of an Intelligent Function Module ........................... 3-134

3.5.1 Commands and buffer memory .....................................................................................................3-134

3.5.2 Accessible intelligent function modules ......................................................................................... 3-139

3.5.3 Reading the buffer memory of an intelligent function module (command: 0601) ........................ 3-141

3.5.4 Writing to the buffer memory of an intelligent function module (command: 1601) ......................3-143

3.6 Programmable Controller CPU Status Control ....................................................................................3-144

3.6.1 Commands, control contents, and character area contents ......................................................... 3-144

3.6.2 Remote RUN (command: 1001) .................................................................................................... 3-146

3.6.3 Remote STOP (command: 1002) .................................................................................................. 3-147

3.6.4 Remote PAUSE (command: 1003) ............................................................................................... 3-148

3.6.5 Remote RESET (command: 1006)................................................................................................ 3-149

3.6.6 Remote latch clear (command: 1005) ...........................................................................................3-150

3.6.7 CPU model name read (command: 0101) .................................................................................... 3-151

3.7 Drive Memory Defragmentation (for Other Station QnACPU) ............................................................ 3-153

3.7.1 Commands and contents of character area..................................................................................3-154

3.7.2 Reading the status of the drive memory usage (command: 0205) .............................................. 3-157

3.7.3 Drive memory defragmentation (command: 1207) .......................................................................3-158

3.8 File Control ............................................................................................................................................ 3-160

3.8.1 Commands and contents of character area..................................................................................3-161

3.8.2 Precautions on file control.............................................................................................................. 3-176

A - 8 A - 8

3.8.3 File control execution procedure for the Q/LCPU .........................................................................3-178

3.8.4 File control execution procedure for the QnACPU........................................................................ 3-183

3.8.5 Read directory/file information (command: 1810): for the Q/LCPU.............................................. 3-187

3.8.6 Search directory/file information (command: 1811): for the Q/LCPU........................................... 3-189

3.8.7 Open file (command: 1827): for the Q/LCPU................................................................................3-190

3.8.8 Close file (command: 182A): for the Q/LCPU ...............................................................................3-192

3.8.9 Read file (command: 1828): for the Q/LCPU ................................................................................3-193

3.8.10 Create new file (command: 1820): for the Q/LCPU .................................................................... 3-195

3.8.11 Write to file (command: 1829): for the Q/LCPU ..........................................................................3-196

3.8.12 Delete files (command: 1822): for the Q/LCPU .......................................................................... 3-198

3.8.13 Copy files (command: 1824): for the Q/LCPU ............................................................................ 3-200

3.8.14 Change date of file creation (command: 1826): for the Q/LCPU ............................................... 3-203

3.8.15 Change file attributes (command: 1825): for the Q/LCPU.......................................................... 3-204

3.8.16 Read file information list: for the QnACPU.................................................................................. 3-206

3.8.17 Reading file presence information (file search) (command: 0203): for the QnACPU................ 3-212

3.8.18 Registering and clearing file locks (command: 0808): for the QnACPU ....................................3-214

3.8.19 Reading the contents of a file (command: 0206): for the QnACPU ........................................... 3-216

3.8.20 Creating a new file (filename registration) (command: 1202): for the QnACPU........................ 3-218

3.8.21 Writing to a file (command: 1203): for the QnACPU................................................................... 3-220

3.8.22 Deleting files (command: 1205): for the QnACPU ...................................................................... 3-224

3.8.23 Copying files (command: 1206): for the QnACPU ...................................................................... 3-226

3.8.24 Changing the file information (command: 1204): for the QnACPU ............................................3-228

3.9 Registering, Deleting and Reading User Frames: for Serial Communication Modules ..................... 3-234

3.9.1 Commands and contents of character area..................................................................................3-234

3.9.2 Registering and deleting user frames (command: 1610).............................................................. 3-237

3.9.3 Reading user frames (command: 0610)........................................................................................ 3-239

3.10 Global Function: for Serial Communication Modules ........................................................................ 3-241

3.10.1 Commands and contents of the character area.......................................................................... 3-241

3.10.2 Control procedure of the global function (command: 1618) .......................................................3-243

3.11 Data Transmission to an External Device (On-Demand Function): for

Serial Communication Modules .........................................................................................................3-245

3.11.1 Execution procedure of the on-demand function ........................................................................ 3-246

3.11.2 Data transmission format of the on-demand function ................................................................. 3-249

3.11.3 Control procedure of the on-demand function (command: 2101) .............................................. 3-251

3.12 Initializing the Transmission Sequence: for Serial Communication Modules ................................... 3-256

3.12.1 Commands ...................................................................................................................................3-256

3.12.2 Transmission sequence initialization (command: 1615) .............................................................3-257

3.13 Mode Switching: for Serial Communication Module ..........................................................................3-258

3.13.1 Commands and contents of the character area.......................................................................... 3-259

3.13.2 Mode switching (command: 1612) .............................................................................................. 3-263

3.14 Turning Off Displayed LEDs and Initializing Communication Error Information and

Error Code: for Serial Communication Module.................................................................................. 3-265

3.14.1 Commands and contents of the character area.......................................................................... 3-

4.2 Turning off displayed LEDs and initializing communication error information and

3.1

error code (command: 1617) .......................................................................................................3-268

3.15 Turning Off the COM.ERR.LED: for E71 ........................................................................................... 3-269

3.15.1 Commands and contents of the character area.......................................................................... 3-269

3.15.2 Turning off the COM.ERR.LED (command: 1617) .....................................................................3-270

265

A - 9 A - 9

3.16 Loopback Test..................................................................................................................................... 3-271

3.16.1 Commands and contents of character area ................................................................................ 3-271

3.16.2 Loopback test (command: 0619) ................................................................................................. 3-272

3.17 Registering or Canceling Programmable Controller CPU Monitoring:

for Serial Communication Modules.................................................................................................... 3-273

3.17.1 Commands and contents of the character area.......................................................................... 3-276

3.17.2 Programmable controller CPU monitoring registration (command: 0630)................................. 3-282

3.17.3 Canceling programmable controller CPU monitoring (command: 0631) ...................................3-285

3.17.4 Data transmitted by the programmable controller CPU monitoring function .............................3-286

3.18 Remote Password Unlock/Lock ......................................................................................................... 3-297

3.18.1 Contents of the command and character section .......................................................................3-301

3.18.2 Remote password unlock/lock (command: 1630, 1631) ............................................................ 3-302

4 WHEN COMMUNICATING USING THE QnA COMPATIBLE 2C FRAMES 4- 1 to 4- 16

4.1 Control Procedures and Message Formats ......................................................................................... 4- 1

4.2 Contents of the Data Designation Items .............................................................................................. 4- 7

4.3 List of Commands and Functions for QnA Compatible 2C Frames.................................................... 4- 8

4.4 Precautions on the Data Communication ............................................................................................ 4- 9

4.5 Example of Data Communication Using QnA Compatible 2C Frames............................................... 4- 10

5 WHEN COMMUNICATING USING THE A COMPATIBLE 1C FRAMES 5- 1 to 5- 54

5.1 Control Procedures and Message Formats ......................................................................................... 5- 1

5.1.1 How to read the control procedure and command reference sections ........................................5- 2

5.1.2 Control procedures and message formats .................................................................................... 5- 4

5.1.3 Contents of data designation items of A compatible 1C frames .................................................. 5- 9

5.1.4 Understanding transmission data in the character areas ............................................................. 5- 14

5.1.5 List of Commands and functions for A compatible 1C frames ..................................................... 5- 15

5.2 Device Memory Read/Write.................................................................................................................. 5- 18

5.2.1 Commands and device range........................................................................................................ 5- 18

5.2.2 Batch read in bit units (command: BR, JR) ................................................................................... 5- 23

5.2.3 Batch write in bit units (command: BW, JW) ................................................................................. 5- 24

5.2.4 Test in bit units (random write) (command: BT, JT)...................................................................... 5- 25

5.2.5 Batch read in word units (command: WR, QR) ............................................................................. 5- 26

5.2.6 Batch write in word units (command: WW, QW)........................................................................... 5- 28

5.2.7 Test in word units (random write) (command: WT, QT) ............................................................... 5- 30

5.2.8 Monitoring device memory............................................................................................................. 5- 31

5.3 Extension File Register Read and Write ..............................................................................................5- 36

5.3.1 ACPU common commands and addresses.................................................................................. 5- 36

5.3.2 AnA/AnUCPU common commands and device numbers ............................................................ 5- 37

5.3.3 Precautions when reading and writing in the extension file register ............................................ 5- 40

5.3.4 Batch reading of the extension file register (command: ER) ........................................................ 5- 41

5.3.5 Batch writing of the extension file register (command: EW)......................................................... 5- 42

5.3.6 Direct reading of the extension file register (command: NR) ........................................................ 5- 43

5.3.7 Direct writing of the extension file register (command: NW)......................................................... 5-

5.3.8 Test of extension file register (random write) (command: ET) ..................................................... 5- 45

5.3.9 Monitoring extension file register ................................................................................................... 5- 46

A - 10 A - 10

5.4 Reading and Writing in the Buffer Memory of an Intelligent Function Module.................................... 5- 49

5.4.1 Commands and processing ........................................................................................................... 5- 49

5.4.2 Understanding the intelligent function module number in the control procedure......................... 5- 50

5.4.3 Reading from the buffer memory of an intelligent function module (command: TR) ................... 5- 52

5.4.4 Writing to the buffer memory of an intelligent function module (command: TW)......................... 5- 53

5.5 Loopback Test....................................................................................................................................... 5- 54

6 WHEN COMMUNICATING USING THE A COMPATIBLE 1E FRAMES 6- 1 to 6- 63

6.1 Message Formats and Control Procedures ......................................................................................... 6- 2

6.1.1 How to read the command reference section ...............................................................................6- 2

6.1.2 Message format and control procedure......................................................................................... 6- 4

6.1.3 Contents of data designation items of A compatible 1E frames................................................... 6- 7

6.1.4 Understanding transmission data in the character areas .............................................................6- 14

6.2 List of Commands and Functions for A Compatible 1E Frames ......................................................... 6- 15

6.3 Device Memory Read/Write.................................................................................................................. 6- 18

6.3.1 Commands and device range........................................................................................................ 6- 18

6.3.2 Batch read in bit units (command: 00)........................................................................................... 6- 25

6.3.3 Batch write in bit units (command: 02) ..........................................................................................6- 27

6.3.4 Test in bit units (random write) (command: 04) ............................................................................ 6- 29

6.3.5 Batch read in word units (command: 01) ...................................................................................... 6- 31

6.3.6 Batch write in word units (command: 03) ......................................................................................6- 33

6.3.7 Test in word units (random write) (command: 05) ........................................................................ 6- 35

6.3.8 Monitoring device memory............................................................................................................. 6- 37

6.4 Extension File Register Read and Write .............................................................................................. 6- 42

6.4.1 ACPU common commands and addresses .................................................................................. 6- 42

6.4.2 AnA/AnUCPU common commands and device numbers ............................................................ 6- 43

6.4.3 Precautions when reading and writing from/to the extension file register .................................... 6- 46

6.4.4 Batch reading of the extension file register (command: 17) .........................................................6- 47

6.4.5 Batch writing of the extension file register (command: 18) ........................................................... 6- 49

6.4.6 Direct reading of the extension file register (command: 3B)......................................................... 6- 51

6.4.7 Direct writing of the extension file register (command: 3C) ..........................................................6- 53

6.4.8 Test of extension file register (random write) (command: 19) ...................................................... 6- 54

6.4.9 Monitoring extension file registers .................................................................................................6- 55

6.5 Reading and Writing in the Buffer Memory of an Intelligent Function Module.................................... 6- 58

6.5.1 Commands and processing ........................................................................................................... 6- 58

6.5.2 Understanding the intelligent function module numbers in the control procedure....................... 6- 59

6.5.3 Reading from the buffer memory of an intelligent function module (command: 0E) ................... 6- 61

6.5.4 Writing to the buffer memory of an intelligent function module (command: 0F) ..........................6- 63

APPENDICES APPX- 1 to APPX- 30

Appendix 1 Reading and Writing by Designation of the Device Memory Extension ......................... APPX- 1

Appendix 1.1 Data order and contents in the character areas when the

device memory extension is designated ................................................................. APPX- 3

Appendix 1.2 Device memory which can have designated extensions and

an example of designation ...................................................................................... APPX- 8

Appendix 1.3 Restrictions when designating the device memory extension ................................ APPX- 16

A - 11 A - 11

Appendix 2 Reading from and Writing to the Buffer Memory ............................................................. APPX- 17

Appendix 3 Processing Time of the Programmable Controller CPU Side While Communicating

Using the MC Protocol..................................................................................................... APPX- 19

Appendix 3.1 Processing time of the programmable controller CPU (increase in scan time)...... APPX- 19

INDEX INDEX- 1 to INDEX- 2

A - 12 A - 12

RELEVANT MANUALS

The details on the MELSEC communication protocol can be confirmed in this manual.

In addition, use the following manuals according to the intended use.

(1) Relevant manuals for the C24

Manual name

Q Corresponding Serial Communication Module User's Manual (Basic)

This manual provides an overview of the module and describes the applicable system configuration, the

specifications, the procedures prior to operations, the basic methods of communicating with the external

device, maintenance and inspection, and the troubleshooting of the serial communication module.

(Sold separately)

MELSEC-L Serial Communication Module User's Manual (Basic)

This manual provides an overview of the module and describes the applicable system configuration, the

specifications, the procedures prior to operations, the basic methods of communicating with the external

device, maintenance and inspection, and the troubleshooting of the serial communication module.

(Sold separately)

Manual number

(model code)

SH-080006

(13JL86)

SH-080894ENG

(13JZ40)

MELSEC-Q/L Serial Communication Module User's Manual (Application)

This manual contains information on how to perform data communication with external devices using the

serial communication module's special functions. (Sold separately)

(2) Relevant manuals for the E71

Manual name

Q Corresponding Ethernet Interface Module User's Manual (Basic)

This manual contains information on the specifications of the Ethernet interface module, the procedures

for data communications with external devices, circuit connection (open/close), fixed buffer exchange,

random access buffer exchange, and the troubleshooting. (Sold separately)

MELSEC-L Ethernet Interface Module User's Manual (Basic)

This manual contains information on the specifications of the Ethernet interface module, the procedures

for data communications with external devices, circuit connection (open/close), fixed buffer exchange,

random access buffer exchange, and the troubleshooting. (Sold separately)

MELSEC-Q/L Ethernet Interface Module User's Manual (Web function)

This manual explains how to use the Web function of the Ethernet interface module. (Sold separately)

SH-080007

(13JL87)

Manual number

(model code)

SH-080009

(13JL88)

SH-081105ENG

(13JZ73)

SH-080180

(13JR40)

A - 13 A - 13

(3) CPU module user’s manual

Manual name

QnUCPU User's Manual (Function Explanation, Program Fundamentals)

Functions, methods, and devices for programming (Sold separately)

Manual number

(model code)

SH-080807ENG

(13JZ27)

Qn(H)/QnPH/QnPRHCPU User's Manual(Function Explanation, Program Fundamentals)

Functions, methods, and devices for programming (Sold separately)

MELSEC-L CPU Module User's Manual (Function Explanation, Program Fundamentals)

Functions, methods, and devices for programming (Sold separately)

QnUCPU User's Manual (Communication via Built-in Ethernet Port)

Functions of the built-in Ethernet port of the CPU module (Sold separately)

MELSEC-L CPU Module User's Manual (Built-In Ethernet Function)

Functions of the built-in Ethernet port of the CPU module (Sold separately)

(4) Operating manual

Manual name

GX Works2 Version1 Operating Manual (Common)

System configuration, parameter settings, and online operations (common to Simple project and

Structured project) of GX Works2. (Sold separately)

GX Developer Version 8 Operating Manual

Operating methods of GX Developer, such as programming, printing, monitoring, and debugging.

(Sold separately)

SH-080808ENG

(13JZ28)

SH-080889ENG

(13JZ35)

SH-080811ENG

(13JZ29)

SH-080891ENG

(13JZ37)

Manual number

(model code)

SH-080779ENG

(13JU63)

SH-080373E

(13JU41)

A - 14 A - 14

MANUAL PAGE ORGANIZATION

• How to use this manual

This manual explains the communication functions via the MC protocol, with each section covering a specific function.

(1) To learn about the communication functions using the MC protocol

• A summary of the data communication using the MC protocol is explained in Section 1.1

• The main data communication functions using the MC protocol are explained in Section 1.2

(2) To learn about the types and access ranges of frames for the MC

protocol

(a) To learn how to read the frame names for the MC protocol

(b) To learn about the types and access ranges of frames

(3) When communicating through the MC protocol

• How to read the frame names is explained in Chapter 1.

• The correspondence between the communication frames of the conventional modules and those for the MC protocol are explained in Section 2.1.

• The types of frames that can be used for the serial communication modules and Ethernet Interface modules are explained in Section 2.1.

• The application and access range of each frame are explained in Section

2.2 and succeeding sections.

• The common information on communication through the MC protocol is explained in Chapter 2, Section 2.3 and succeeding sections.

• The commands, message formats, and control procedures for A compatible 1C frame are explained in Chapter 5.

• The commands, message formats, and control procedures for A compatible 1E frame are explained in Chapter 6.

• The commands, message formats, and control procedures for QnA compatible 2C frame are explained in Chapter 4.

• The commands, message formats, and control procedures for QnA compatible 3E, QnA compatible 3C, QnA compatible 4C frames, and 4E frame are explained in Chapter 3.

A - 15 A - 15

• Structure of this manual

The explanations of the message formats and the control procedures while communicating through the MC protocol are given in the following format:

[Control procedure]

(1) Reading eight points of data from internal

relays M100 to M107 in communication in ASCII code

(Refer to Section 3.3.1.)

(Data name)

External device side

(Example)

(Data name)

Programmable controller CPU side

(Example)

Command

H--LH- L H----LH--L

04010001M 0001000008

30H34H30H31H30H30H30H31H4DH2AH30H30H30H31H30H30H30H30H30H38

Device code

Subcommand

Number of device points to be read

Head device

An asterisk (

) in both the command message and the response message indicates the same order of data

items as in the control procedures when other commands are used.

Number of points to be read

Number of

device points

0 (30H) indicates off 1 (31

(Refer to Section 3.1.5.)

Data for the number of designed device points

00010010

30H30H30H31H30H30H31H30

M100 = OFF

H) indicates on.

M106 = ON

M107 = OFF

This is a description of the request from the external device side for the control procedure explained in the example.

This diagram illustrates the sequence of data items in the command message to be sent by the external device.

This diagram illustrates the sequence of data items in the response message (the message providing the processing result) to be sent by the programmable controller CPU side for the request sent from the external device side.

(The head and end sections of the command and response messages.)

Confirm the order of data items in the fields marked with "

" by referring to the reference sections listed

below.

The order of data items in the fields marked with "

" differs between Ethernet interface modules and serial

communication modules.

(1) When communicating via an Ethernet Interface module

A compatible 1E frame : Refer to Section 6.1. QnA compatible 3E frame : Refer to Section 3.1.2. 4E frame : Refer to Section 3.1.2.

(2) When communicating via a serial communication module

A compatible 1C frame : Refer to Section 5.1. QnA compatible 2C frame : Refer to Section 4.1. QnA compatible 3C frame : Refer to Section 3.1.4. QnA compatible 4C frame : Refer to Section 3.1.5.

A - 16 A - 16

GENERIC TERMS AND ABBREVIATIONS

This manual uses the following generic terms and abbreviations to explain the serial communication modules, Ethernet interface modules, and devices for data communication unless otherwise specified.

(1) Generic terms and abbreviations for CPU modules

Generic term /abbreviation

ACPU

AnACPU Generic term for A2ACPU, A2ACPU-S1, A2ACPUP21/R21, A2ACPUP21/R21-S1, A3ACPU, A3ACPUP21/R21.

AnA/AnU/QnACPU Generic term for AnACPU, AnUCPU, QnACPU.

AnNCPU

AnUCPU Generic term for A2UCPU, A2UCPU-S1, A2ASCPU, A2ASCPU-S1, A3UCPU, A4UCPU.

AnU/QnACPU Generic term for AnUCPU, QnACPU.

LP25/BR15 Generic term for AJ72LP25, AJ72BR15.

QCPU

QnUDVCPU Generic term for Q03UDVCPU, Q04UDVCPU, Q06UDVCPU, Q13UDVCPU, Q26UDVCPU.

QCPU (A mode) Generic term for Q02CPU-A, Q02HCPU-A, Q06HCPU-A.

Basic model QCPU Generic term for Q00JCPU, Q00CPU, Q01CPU.

High Performance model QCPU

Process CPU Generic term for Q02PHCPU, Q06PHCPU, Q12PHCPU, Q25PHCPU.

Redundant CPU Generic term for Q12PRHCPU, Q25PRHCPU.

Universal model QCPU

LCPU Generic term for MELSEC-L series CPU modules.

Safety CPU

QCPU station Abbreviation for the programmable controller with QCPU installed.

QE71

QLP21/QBR11 Generic term for AJ71QLP21, AJ71QBR11.

QLP25/QBR15 Generic term for AJ72QLP25 (G), AJ72QBR15, A1SJ72QLP25, A1SJ72QBR15.

QnACPU

QnACPU station Abbreviation for the programmable controller with QnACPU installed.

C24

E71 Abbreviation for QJ71E71-100, QJ71E71-B5, QJ71E71-B2 and LJ71E71-100 Ethernet interface modules.

Serial communication module

UC24 Computer link module

Generic term for AnNCPU, AnACPU, AnUCPU, QCPU (A mode).

Generic term for A1NCPU, A1NCPUP21/R21, A2NCPU, A2NCPU-S1, A2NCPUP21/R21, A2NCPUP21/R21-S1, A3NCPU, A3NCPUP21/R21.

Generic term for the Basic model QCPU, High Performance model QCPU, Process CPU, Redundant CPU, and Universal model QCPU.

Generic term for Q02CPU, Q02HCPU, Q06HCPU, Q12HCPU, Q25HCPU.

Generic term for Q00UJCPU, Q00UCPU, Q01UCPU, Q02UCPU, Q03UDCPU, Q03UDVCPU, Q03UDECPU, Q04UDHCPU, Q04UDVCPU, Q04UDEHCPU, Q06UDHCPU, Q06UDVCPU, Q06UDEHCPU, Q10UDHCPU, Q10UDEHCPU, Q13UDHCPU, Q13UDVCPU, Q13UDEHCPU, Q20UDHCPU, Q20UDEHCPU, Q26UDHCPU, Q26UDVCPU, Q26UDEHCPU, Q50UDEHCPU, Q100UDEHCPU.

Generic term for QS001CPU. When characteristics in common with QCPUs are described, however, it is referred to as QCPU or Q series CPU.

Generic term for AJ71QE71N3-T, AJ71QE71N-B5, AJ71QE71N-B2, AJ71QE71N-T, AJ71QE71N-B5T, A1SJ71QE71N3-T, A1SJ71QE71N-B5, A1SJ71QE71N-B2, A1SJ71QE71N-T, A1SJ71QE71N-B5T.

Generic term for Q2ACPU, Q2ACPU-S1, Q2ASCPU, Q2ASCPU-S1, Q2ASHCPU, Q2ASHCPU-S1, Q3ACPU, Q4ACPU, Q4ARCPU.

Abbreviation for QJ71C24N, QJ71C24N-R2, QJ71C24N-R4, QJ71C24, QJ71C24-R2, LJ71C24 and LJ71C24-R2 serial communication modules.

Generic term for the modules below.

Q series QJ71C24N, QJ71C24N-R2, QJ71C24N-R4, QJ71C24, QJ71C24-R2.

L series LJ71C24, LJ71C24-R2.

QnA series

Generic term for AJ71UC24, A1SJ71UC24-R2, A1SJ71UC24-R4, A1SJ71UC24-PRF, A1SJ71C24-R2, A1SJ71C24-R4, A1SJ71C24-PRF, A2CCPUC24, A2CCPUC24-PRF.

For the module model names, refer to the manual for the CPU module used.

Description

A series programmable controller CPUs accessible from external devices using the MC protocol communication

functions.

AJ71QC24, AJ71QC24-R2, AJ71QC24-R4, A1SJ71QC24, A1SJ71QC24-R2, AJ71QC24N, AJ71QC24N-R2, AJ71QC24N-R4, A1SJ71QC24N, A1SJ71QC24N-R2.

A series computer link module

A - 17 A - 17

Generic term/abbreviation Description

User’s Manual (Basic)

User’s Manual (Application)

(2) Generic terms and abbreviations for manuals

• Serial communication module

Q Corresponding Serial Communication Module User’s Manual (Basic)

MELSEC-L Serial Communication Module User’s Manual (Basic)

• Ethernet interface module

Q Corresponding Ethernet Interface Module User’s Manual (Basic)

MELSEC-L Ethernet Interface Module User’s Manual (Basic)

• Serial communication module

MELSEC-Q/L Serial Communication Module User’s Manual (Application)

• Ethernet interface module

MELSEC-Q/L Ethernet Interface Module User’s Manual (Application)

(3) Other generic terms and abbreviations

Generic term/abbreviation Description

Buffer memory

Computer

Data communication function

I/F Abbreviation for Interface.

MELSECNET/10 Abbreviation for MESECNET/10 Network System.

MELSECNET/H Abbreviation for MESECNET/H Network System.

ONDEMAND Abbreviation for G.ONDEMAND or GP.ONDEMAND.

RS-232 (interface) Abbreviation for Interface that conforms to the RS-232 interface.

RS-422/485 (interface) Abbreviation for Interface that conforms to either the RS-422 or RS-485 interface.

Switch setting Generic term for intelligent function module switch setting.

Generic term for the memory of the intelligent function module or special function module

for storing the transmission/reception data when communicating with the programmable

controller CPU (such as setting values and monitor values).

Generic term for a unit in the external device that can communicate data through the MC

protocol or bidirectional protocol.

Generic term for the MC protocol, pre-defined protocol, non-procedure protocol, or

bidirectional protocol.

A - 18 A - 18

TERMS

The following table outlines the meanings and descriptions of the terms used in this and relevant manuals of the Ethernet Interface module.

Term Description

One of the message formats for the serial communication module used to communicate ASCII code

data through the MC protocol.

A-compatible 1C frame

(formats 1 to 4)

A-compatible 1E frame

Bidirectional protocol

Control CPU

Control system CPU In a redundant system, the Redundant CPU on the controlling side.

GX Configurator-SC A setting and monitoring tool for the serial communication module.

GX Developer

GX Works2

Independent operation

Intelligent function module

device

Linked operation

MELSEC communication

protocol

(MC protocol)

Message transmission

function

(printer function)

Multidrop connection

MX Component

Non-procedure protocol

Pre-defined protocol

This is the same message format as when communicating through the dedicated protocol for A series

computer link modules.

For a Q/LCPU, reading from and writing to device memories are allowed within the same device range

as for an AnACPU.

One of the message formats for the Ethernet interface module used to communicate ASCII or binary

code data through the MC protocol.

This is the same message format as when reading/writing data from/to the programmable controller

CPU of an A series Ethernet interface module.

For a Q/LCPU, reading from and writing to device memories are allowed within the same device range

as for an AnACPU.

A communication procedure of the serial communication module and one of the data communication

functions of the serial communication module that allow communication of arbitrary data between the

programmable controller CPU and external devices.

The QCPU which controls each I/O module and the intelligent function module.

In a multiple CPU system, a control QCPU can be set for each module.

Product name of the software package for the MELSEC programmable controllers.

Operation of two interfaces of the serial communication module in which each interface performs data

communication with an external device independently of each other, using a function designated in each

transmission protocol setting.

A MELSEC-Q/L series module that has other than input or output, such as A/D converter module and

D/A converter module.

Devices used to directly accesses the buffer memory of the intelligent function module from the CPU

module.

Operation of two interfaces of the serial communication module when they are linked to perform data

communication with external devices that are connected to each of the two interfaces.

The two interfaces perform communication using the same data communication function (MC protocol

(same format) or non-procedure protocol) or the same transmission specifications. (Linked operation

cannot be performed using the bidirectional protocol.)

One of the data communication functions of the serial communication module or Ethernet interface

module used to access the programmable controller CPU from a target device.

(Referred to as the MC protocol in this manual)

Communications with ASCII code data and binary code data are available.

A function that preregisters character data (messages) to be sent to an external device (mainly printers)

in the serial communication module as a user frame, and sends registered data of multiple user frames

using the non-procedure protocol (sent by instruction from the programmable controller CPU).

A mode of connection using the RS-422/485 interface of the serial communication module in which

multiple external devices and other serial communication modules are connected in 1:n or m:n mode.

An Active X® control library for serial communication (MELSOFT product)

A user’s communication procedure, and one of the data communication functions of the serial

communication module for communicating arbitrary data between the programmable controller CPU

and an external device.

One of the data communication functions available for the C24.

This must be set in GX Works2 or GX Configurator-SC (Pre-defined protocol support function).

A - 19 A - 19

Term Description

Programming tool Generic term for GX Works2 and GX Developer.

One of the message formats for the serial communication modules used to communicate ASCII code

QnA-compatible 2C frame

(formats 1 to 4)

QnA-compatible 3C frame

(formats 1 to 4)

QnA compatible 4C frame

(formats 1 to 4)

QnA-compatible 3E frame

QnA-compatible 4C frame

(format 5)

SD memory card

Special function module

device

Standby system CPU In a redundant system, the Redundant CPU on the standby side prepared for control system failure.

System A CPU

System B CPU

User frame

4E frame

data through the MC protocol.

This is the same message format as the frames for communication through the dedicated protocol of

QnA series serial communication modules.

• QnA compatible 2C frame (formats 1 to 4): QnA simplified frame (formats 1 to 4)

One of the message formats for the serial communication modules used to communicate ASCII code

data through the MC protocol.

This is the same message format as the frame for communication through the dedicated protocol of

QnA series serial communication modules.

• QnA compatible 3C frame (formats 1 to 4): QnA frame (formats 1 to 4)

• QnA compatible 4C frame (formats 1 to 4): QnA extension frame (formats 1 to 4)

One of the message formats for the Ethernet interface modules used to communicate ASCII or binary

code data through the MC protocol.

This is the same message format as when reading/writing data from/to the programmable controller

CPU of a QnA series Ethernet interface module.

One of the message formats for the serial communication modules used to communicate binary code

data through the MC protocol.

This is the same message format as the frame for communication through the dedicated protocol of a

QnA series serial communication module.

• QnA compatible 4C frame (format 5): QnA extension frame (format 5)

Secure Digital Memory Card, which is a flash memory device.

The L1MEM-2GBSD and L1MEM-4GBSD are available.

A MELSEC-A/QnA series module that has other than input or output, such as A/D converter module

and D/A converter module.

Devices used to directly accesses the buffer memory of the special function module from the CPU

module.

In a redundant system, the Redundant CPU on the side to which the system A connector of the tracking

cable is connected.

In a redundant system, the Redundant CPU on the side to which the system B connector of the tracking

cable is connected.

Data name used when registering the fixed format section of a message to be communicated between

the serial communication module and an external device using the functions listed below, in order to use

it for data transmission and reception. (The contents of data in a user frame should be consistent with

the specifications of the external device.)

Used for registering the sequence of data of each of the head and ending sections in a communication

message (transmission control code, C24 station number, sum check, fixed data, etc.) to the serial

communication module.

• The on-demand function of the MC protocol

• Data transmission and reception functions through the non-procedure protocol.

One of the message formats for the Ethernet interface modules, in which ASCII or binary code data are

transferred with the MC protocol.

Any given number (serial No.) for message identification is added to the QnA compatible 3E frame.

By the serial No. which is added by the external device for message identification, the correspondence

between command and response messages can be checked.

A - 20 A - 20

1 OVERVIEW

This manual provides information on the methods that are employed by external devices to read and write data from/to the programmable controller CPU using the data communication functions of the MELSEC communication protocol (referred to as the MC protocol in this manual) via the serial communication modules or Ethernet interface modules. When applying the following program examples to the actual system, make sure to examine the applicability and confirm that it will not cause system control problems. Operating procedures are explained using GX Developer. Note that some screen names and items may differ when using GX Works2.

When performing data communication using the MC protocol, please read Chapter 2.

1.1 Overview of the MELSEC Communication Protocol

The following is an overview of the MC protocol:

(1) The MC protocol is the name of a communication method for Q/L series

programmable controller and is used by external devices to read and write device data and programs of the programmable controller CPU via the C24 or E71.

Communications through the MC protocol can be performed if a device can incorporate application programs and send/receive data using the control procedures of the MC protocol.

(2) The message formats and control procedures for an external device to access the

programmable controller CPU are defined separately for the C24 and E71.

QJ71E71

QJ71C24

RUN

PRM

S T

D LINK

MODE

RUN

N O

MODE

ERR.

x10010 1

RUN

ERR.

USER

BAT. BOOT

USB

OUT

RS-232

ERR.

INIT.

COM.ERR

CH1. CH2.

OPEN

10BASE-T

CH1.

RS-232

10BASE

CH.2

SDA

SDB

(FG)

RDA

(FG)

RDB

+ 12V

12G

RS-422

/485

PULL

MITSUBISHI

Q25HCPU

POWER

MELSEC

QJ71E71

QJ71C24

RUN

PRM

S T

MODE

D LINK

RUN

N O

MODE

ERR.

x10010 1

RUN

ERR.

USER

BAT. BOOT

USB

OUT

RS-232

ERR.

INIT.

COM.ERR

CH2.

CH1.

OPEN

10BASE-T

CH1.

RS-232

10BASE

CH.2

SDA

SDB

(FG)

RDA

(FG)

RDB

+ 12V

12G

RS-422

/485

PULL

MITSUBISHI

Q25HCPU

POWER

MELSEC

Q25HCPU

MELSEC

POWER

PULL

MITSUBISHI

QJ71C24

RUN

PRM

S T

MODE

D LINK

RUN

N O

MODE

ERR.

x100101

RUN

ERR.

USER

BAT.

BOOT

USB

OUT

RS-232

ERR.

INIT.

COM.ERR

CH2.

CH1.

OPEN SD

10BASE-T

CH1.

RS-232

10BASE

CH.2

SDA

SDB

(FG)

RDA

(FG)

RDB

+ 12V

12G

RS-422

/485

(3) The message formats and control procedures during data communication using

the MC protocol are the same as when accessing the programmable controller

E N Q

HL HL H L H L

0001QR 0 X000040 0 227

05H30H30H30H31H51H52H30H58H30H30H30H30H34H30H30H32H37H32

(Command message of the A compatible 1C frame) (Response message of the A compatible 1C frame)

CPU via conventional A/QnA series modules.

Number of

Sum

check

code

Station

number

PC number

Command

Head device

Message wa it

device point s

2 characters

(hexadecima l)

S T X

02H30H30H30H31H31H32H33H34H42H43H44

Data for the number

of device points

Station

number

HL H L

000 11234 BCD

device points

X 4 characters

PC number

Number of

Sum

check

code

39H38

1 - 1 1 - 1

An external device can access a Q/L series programmable controller using a program with which the programmable controller is accessed via one of the following A/QnA series modules.

1) Accessing the programmable controller via the C24

It is possible to access the programmable controller using a program on the external device via the following A/QnA series modules.

• A series computer link module

• QnA series serial communication module

2) Accessing the programmable controller via the E71

It is possible to access the programmable controller using a program on the external device via the following A/QnA series modules.

• A series Ethernet interface module

• QnA series Ethernet interface module

The data communication functions using the MC protocol correspond

to the following data communication function of the conventional modules.

• In case of the C24 Corresponds to the data communication functions using the dedicated protocol supported by A series computer link modules and QnA series serial communication modules.

• In case of the E71 Corresponds to the functions for reading/writing data from/to the programmable controller CPU supported by A series/QnA series Ethernet interface modules.

(4) At the programmable controller CPU side, the C24/E71 sends/receives data

according to the commands from an external device. Thus, a sequence program for data communication is not required at the programmable controller CPU side.

In case of the C24, a sequence program for data communication is required

when using the on-demand function for sending data from the programmable controller CPU.

(5) If the external device is a personal computer, it is possible to create a

communication program for the external device without considering the message formats or transmission/reception procedures of the MC protocol by using a separately-available communication support tool (MX Component).

Depending on the version of MX Component used, different operating

systems are supported. For details, refer to the MX Component manual.

1 OVERVIEW

1 - 2 1 - 2

1.2 Features of the MELSEC Communication Protocol

This section explains the features of the MC protocol.

(1) The data communication using the MC protocol is a function that enables the

reading/writing of data from/to the programmable controller CPU in order to control and monitor the programmable controller equipment from the external device side.

Reading/writing device data and program files for the programmable controller CPU and controlling the programmable controller CPU status (remote RUN/STOP) can be performed from the external devices (personal computer, indicator, etc.)

(a) Reading and writing data

By reading/writing data to/from the device memory of the programmable controller CPU and the buffer memory of the intelligent function modules, the following control operations can be performed: Data read and write operations can also be performed for A/QnA series programmable controller CPUs (other stations) and intelligent function modules.

1) Reading data Operation monitoring, data analysis, production control, etc. can be performed from the external device side.

2) Writing data Production instructions, etc. can be issued from the external device side.

(b) Reading and writing files

By reading and writing files for sequence programs and parameters stored in the programmable controller CPU, the following control operations can be performed:

1) Reading files File management for the local station’s QCPU/LCPU and other station' QCPU/LCPU/QnACPU can be performed from the external device side.

2) Writing files Programs such as execution programs can be modified (replaced) by writing file data stored in the external device to the programmable controller CPU as needed.

The programmable controller CPU can be remotely controlled from the external device by performing remote RUN/STOP/PAUSE/LATCH CLEAR/RESET operations.

1 OVERVIEW

1 - 3 1 - 3

(2) In a system using -Link IE Controller Network, CC-Link IE Field Network,

MELSECNET/H, MELSECNET/10, and Ethernet, an external device can access programmable controller CPUs of other stations over the respective network.

1 OVERVIEW

(3) The C24 is equipped with the programmable controller CPU monitoring function.

By using this function, the programmable controller CPU status and data in the device memory can be sent to an external device at constant intervals, upon the occurrence of a mechanical error, or when certain conditions are satisfied. This helps reduce the number of data read processes performed by the external device.

The E71 also has the programmable controller CPU monitoring function that

uses e-mail transmission. (Refer to the User's Manual (Application).)

POINT

To check what functions can be performed by external devices when communicating data through the MC protocol, refer to the "Commands and function list" reference sections in Chapters 3 to 6.

1 - 4 1 - 4

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION

PROTOCOL

This chapter explains the data communication using the MC protocol when an external device reads data from and writes data to a programmable controller CPU using the C24/E71.

2.1 Types and Applications of Data Communication Frames

This section provides information about the types and applications of frames (data communication messages) used by the external device to access the programmable controller CPU using the MC protocol. When the external device accesses the programmable controller via the C24/E71, the data communication is performed by transmission/reception of command messages (access requests) and response messages (responses) of one of the following frames listed below. Choose the frame to be used by considering the accessible range of each frame

Target module Available communication frame Code of communication data Control procedure reference section

QnA compatible 3C frame Formats 1 to 4 ASCII code

C24

E71

QnA compatible 4C frame Format 5 Binary code

QnA compatible 2C frame Chapter 4

A compatible 1C frame

4E frame

QnA compatible 3E frame

A compatible 1E frame

shown in Section 2.2.

Chapter 3

Formats 1 to 4 ASCII code

ASCII code or binary code

Chapter 5

Chapter 3

Chapter 6

(1) QnA compatible 3C, QnA compatible 4C and QnA compatible 3E

frames

(a) These frames are mainly used to access all devices and files of the

Q/L/QnACPU from the external device.

(b) These frames enable access to A series programmable controller devices

also through CC- Link IE Controller Network, CC-Link IE Field Network, MELSECNET/H, MELSECNET/10, and Ethernet. (Refer to Section 2.2 (1))

(2) 4E frame

(a) These frames are mainly used to access all devices and files of the Q/LCPU

from the external devices.

(b) These frames enable access to A/QnA series programmable controller

devices also through CC- Link IE Controller Network, CC-Link IE Field Network, MELSECNET/H, MELSECNET/10, and Ethernet. (Refer to Section 2.2 (2))

(3) QnA compatible 2C frame

(a) This frame can access the device memory of QCPU/LCPU stations on which

the C24 is loaded and Q/L/QnACPU stations linked by multidrop connection.

(b) The message format is simplified compared to the QnA compatible

3E/3C/4C frames.

easier to be processed by the external device and the transmission times of the messages are shortened.

2 - 1 2 - 1

(4) A compatible 1C and A compatible 1E frames

(a) These frames have the same message structure as when accessing the

programmable controller CPU using an A series computer link module or Ethernet interface module.

(b) By utilizing the software for data communication on the external device that

has been created for the A series programmable controllers, Q/L/QnACPUs linked by multidrop connection or network connection, and programmable controller CPUs other than Q/L/QnACPU can be accessed using the same frame.

With respect to the Q/L/QnACPUs, only those devices with the same names as those existing in the AnCPUs, AnNCPUs, AnACPUs and AnUCPUs can be accessed within the AnACPU device range.

• When using the C24 : Refer to Section 5.2.1(2)

• When using the E71 : Refer to Section 6.3.1(2)

Devices that have been newly added to Q/L/QnACPUs cannot be accessed.

module must be 10102 or later. If the serial No. (first five digits) is 10101 or earlier, make access using the QnA compatible 2C/3C/4C frame, QnA compatible 3E frame, or 4E frame.

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL

REMARKS

(1) The following explains how to read the data communication frame names

when performing data communication using the MC protocol. A data communication frame name indicates a relevant programmable controller CPU series to show command compatibility with conventional modules, a frame designation of the corresponding conventional module, and the target module.

xxx compatible n m frame a) b) c) (Examples: QnA compatible 3C frame, QnA compatible 3E frame)

(a) Relevant programmable controller CPU series, showing command

compatibility with conventional modules

A : A series programmable controller CPU QnA : QnA series programmable controller CPU

(b) Frames of the corresponding conventional modules

1 : Corresponds to the communication frames of commands supported

by A series computer link modules and Ethernet interface modules.

2 : Corresponds to the QnA simplified frames supported by QnA

series serial communication modules.

3 : Corresponds to the QnA frames supported by QnA series serial

communication modules and the communication frames supported by QnA series Ethernet interface modules.

4 : Corresponds to the QnA extension frames supported by QnA

series serial communication modules.

performed using the applicable frames.

C : C24 E : E71

2 - 2 2 - 2

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL

(2) When accessing via the C24

The external device accesses the programmable controller CPU using frames with a format number selected in the "Communication protocol setting" in the switch settings using the programming tool.

When any of Formats 1 to 4 is selected, access is enabled using each of the

four types of frames shown above and data communication is performed by the transmission/reception of command messages and response messages in the selected format.

(3) When accessing via the E71

The external device can access using any of the two types of frames shown above; it accesses the programmable controller CPU by sending/receiving command messages and response messages using frames corresponding to the setting selected in the operation settings using the programming tool.

(4) Time required for communication in binary code is shortened because the

amount of the communication data is approximately a half of what is required for communication in ASCII code data.

2.2 Accessible Range of Each Data Communication Frames

In a communication using the MC protocol, access to programmable controller stations on which the C24/E71 is not loaded is possible via CC-Link IE Controller Network, CC-Link IE Field Network, MELSECNET/H, MELSECNET/10 and Ethernet. This section explains the range of programmable controllers of other stations that can be accessed from an external communication device when the access destination programmable controller is not directly connected by a serial communication line or Ethernet.

Target module Frame used

QnA compatible 3C frame Formats 1 to 4

C24

E71

QnA compatible 4C frame

QnA compatible 2C frame

A compatible 1C frame

4E frame

QnA compatible 3E frame

A compatible 1E frame

Formats 1 to 4

Format 5

Formats 1 to 4

: Accessible, : Not accessible

Range of accessible stations

1) 2) 3) 4)

2 - 3 2 - 3

(1) When using the C24

1 The network represents CC-Link IE Controller Network,

CC-Link IE Field Network, MELSECNET/H, MELSECNET/10, or Ethernet.

(2) When using the E71

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL

1 The network represents CC-Link IE Controller Network, CC-Link IE Field

Network, MELSECNET/H, MELSECNET/10, or Ethernet.

POINT

By setting the routing parameter (communication path) in advance, access to programmable controllers on the following network systems is also available.

• CC-Link IE Controller Network

• CC-Link IE Field Network

• MELSECNET/H

• MELSECNET/10

• Ethernet

Accessible range is up to the eighth network (number of relay stations: 7).

2 - 4 2 - 4

+ 502 hidden pages

Mitsubishi QJ71C24, QJ71E71-B5, QJ71C24-R2, QJ71E71-100, QJ71E71-B2 Reference Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

 SAFETY PRECAUTIONS 

 CONDITIONS OF USE FOR THE PRODUCT 

REVISIONS

INTRODUCTION

CONTENTS

RELEVANT MANUALS

MANUAL PAGE ORGANIZATION

GENERIC TERMS AND ABBREVIATIONS

TERMS

1 OVERVIEW

1.1 Overview of the MELSEC Communication Protocol

1.2 Features of the MELSEC Communication Protocol

2 DATA COMMUNICATION USING THE MELSEC COMMUNICATION PROTOCOL

2.1 Types and Applications of Data Communication Frames

2.2 Accessible Range of Each Data Communication Frames