Mitsubishi MELSEC-L Series User manual

1
SAFETY PRECAUTIONS
(Read these precautions before using this product.)
Before using this product, please read this manual and the relevant manuals carefully and pay full attention
to safety to handle the product correctly.
In this manual, the safety precautions are classified into two levels: " WARNING" and " CAUTION".
Under some circumstances, failure to observe the precautions given under " CAUTION" may lead to
serious consequences.
Observe the precautions of both levels because they are important for personal and system safety.
Make sure that the end users read this manual and then keep the manual in a safe place for future
reference.
WARNING
CAUTION
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.

2
[Design Precautions]
[Design Precautions]
WARNING
●For the operating status of each station after a communication failure, refer to relevant manuals for
each network. Incorrect output or malfunction due to a communication failure may result in an
accident.
●To prevent the malfunction of the programmable controller system due to harmful e-mails, take
preventive measures (such as antivirus measures) so that the mail server for this module does not
receive harmful e-mails.
●To maintain the safety of the programmable controller system against unauthorized access from
external devices via the Internet, take appropriate measures.
●When connecting a peripheral with the CPU module or connecting an external device, such as a
personal computer, with an intelligent function module to modify data of a running programmable
controller, configure an interlock circuit in the program to ensure that the entire system will always
operate safely. For other forms of control (such as program modification or operating status change)
of a running programmable controller, read the relevant manuals carefully and ensure that the
operation is safe before proceeding. 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 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" signal as an output signal from the CPU module to the intelligent
function module. Doing so may cause malfunction of the programmable controller system.
CAUTION
●Do not install the control lines or communication cables together with the main circuit lines or power
cables. Keep a distance of 100mm or more between them. Failure to do so may result in malfunction
due to noise.
●When changing the operating status of the CPU module (such as remote RUN/STOP) from the
external device, select "Always wait for OPEN (Communication possible at STOP time)" for the "Initial
timing" setting in the network parameter. The communication line will be closed when "Do not wait for
OPEN (Communications impossible at STOP time)" is selected and the remote STOP is executed
from the external device. Consequently, the CPU module cannot reopen the communication line, and
the external device cannot execute the remote RUN.

3
[Installation Precautions]
[Wiring Instructions]
CAUTION
●Use the programmable controller in an environment that meets the general specifications in the Safety
Guidelines included with the MELSEC-L series CPU module. Failure to do so may result in electric
shock, fire, malfunction, or damage to or deterioration of the product.
●To interconnect modules, engage the respective connectors and securely lock the module joint levers
until they click. Incorrect interconnection may cause malfunction, failure, or drop of the module.
●Shut off the external power supply (all phases) used in the system before mounting or removing a
module. Failure to do so may result in damage to the product.
●Do not directly touch any conductive parts and electronic components of the module. Doing so can
cause malfunction or failure of the module.
CAUTION
●When connecting a cable with connector to the module, connect the connector part to the module
securely.
●Place the cables in a duct or clamp them. If not, dangling cable may swing or inadvertently be pulled,
resulting in damage to the module or cables or malfunction due to poor contact.
●When disconnecting the communication and power cables from the module, do not pull the cables by
hand. For the cable with connector, hold the connector part of the cable. Pulling the cable connected
to the module may result in malfunction or damage to the module or cable.
●Prevent foreign matter such as dust or wire chips from entering the module. Such foreign matter can
cause a fire, failure, or malfunction.
●A protective film is attached to the top of the module to prevent foreign matter, such as wire chips,
from entering the module during wiring. Do not remove the film during wiring. Remove it for heat
dissipation before system operation.

4
[Setup and Maintenance Precautions]
[Setup and Maintenance Precautions]
[Operating Precautions]
[Disposal Precautions]
WARNING
●Shut off the external power supply (all phases) used in the system before cleaning the module. Failure
to do so may result in electric shock.
CAUTION
●Do not disassemble or modify the module. Doing so may cause failure, malfunction, injury, or a fire.
●Shut off the external power supply (all phases) used in the system before connecting or disconnecting
a module. Failure to do so may cause the module to fail or malfunction.
●After the first use of the product (module and display unit), the number of connections/disconnections
is limited to 50 times (in accordance with IEC 61131-2). Exceeding the limit may cause malfunction.
●Before handling the module, touch a conducting object such as a grounded metal to discharge the
static electricity from the human body. Failure to do so may cause the module to fail or malfunction.
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.
CAUTION
●When disposing of this product, treat it as industrial waste.

5
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.

6
INTRODUCTION
Thank you for purchasing the Mitsubishi MELSEC-L series programmable controllers. This manual describes the
operating procedure, system configuration, parameter settings, functions, programming, and troubleshooting of the
LJ71E71-100 Ethernet interface module (hereafter referred to as E71).
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.
When applying the program examples introduced in this manual to the actual system, ensure the applicability and
confirm that it will not cause system control problems.
Please make sure that the end users read this manual.
Remark
Unless otherwise specified, this manual describes the program examples in which the I/O numbers of X/Y00 to X/Y1F are
assigned for an E71.
For I/O number assignment, refer to the following.
MELSEC-L CPU Module User's Manual (Function Explanation, Program Fundamentals)
COMPLIANCE WITH EMC AND LOW VOLTAGE
DIRECTIVES
(1) Method of ensuring compliance
To ensure that Mitsubishi programmable controllers maintain EMC and Low Voltage Directives when incorporated
into other machinery or equipment, certain measures may be necessary. Please refer to one of the following
manuals.
• MELSEC-L CPU Module User's Manual (Hardware Design, Maintenance and Inspection)
• Safety Guidelines (This manual is included with the CPU module.)
The CE mark on the side of the programmable controller indicates compliance with EMC and Low Voltage
Directives.
(2) Additional measures
To ensure that this product maintains EMC and Low Voltage Directives, please refer to one of the manuals listed
under (1).

7
RELEVANT MANUALS
The manuals related to this product are listed below. Please place an order as needed.
(1) E71 (relevant) manuals
(2) CPU module user's manuals
(3) Operating manual
Manual name
<manual number, model code> Description
MELSEC-Q/L Ethernet Interface Module User's
Manual (Application)
<SH-080010, 13JL89>
The e-mail function, CPU module monitoring function, communications over CC-
Link IE Controller Network, CC-Link IE Field Network, MELSECNET/H, or
MELSECNET/10, communications using data link instructions, and file transfer
function (FTP server) of the E71
MELSEC-Q/L Ethernet Interface Module User's
Manual (Web function)
<SH-080180, 13JR40>
The Web function of the E71
MELSEC-Q/L MELSEC Communication Protocol
Reference Manual
<SH-080008, 13JF89>
Communication methods and control procedures through the MC protocol used for
data communications between a connected device and a CPU module using the
C24/E71
Manual name
<manual number, model code> Description
MELSEC-L CPU Module User's Manual (Hardware
Design, Maintenance and Inspection)
<SH-080890ENG, 13JZ36>
Specifications of the CPU modules, power supply modules, display unit, branch
module, extension module, SD memory cards, and batteries, information on how
to establish a system, maintenance and inspection, and troubleshooting
MELSEC-L CPU Module User's Manual (Function
Explanation, Program Fundamentals)
<SH-080889ENG, 13JZ35>
Functions, programming methods, and devices of the CPU module
Manual name
<manual number, model code> Description
GX Works2 Version 1 Operating Manual (Common)
<SH-080779ENG, 13JU63>
System configuration, parameter settings, and online operations (common to
Simple project and Structured project) of GX Works2

CONTENTS
8
CONTENTS
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
CONDITIONS OF USE FOR THE PRODUCT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
COMPLIANCE WITH EMC AND LOW VOLTAGE DIRECTIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RELEVANT MANUALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MANUAL PAGE ORGANIZATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
TERM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PACKING LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
CHAPTER 1 FEATURES 19
CHAPTER 2 PART NAMES 24
CHAPTER 3 SPECIFICATIONS 26
3.1 General Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
3.2 Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.3 Function List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
3.3.1 Function list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.3.2 Use with other functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.4 List of I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
3.5 Buffer Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
3.5.1 Configuration of the buffer memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
3.5.2 List of buffer memory addresses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
CHAPTER 4 PROCEDURES BEFORE OPERATION 54
CHAPTER 5 SYSTEM CONFIGURATION 56
5.1 Overall System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
5.2 Network Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5.3 Applicable Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
CHAPTER 6 INSTALLATION AND WIRING 59
6.1 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.2 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
CHAPTER 7 COMMUNICATION PROCEDURE 62
7.1 Setting Parameters Required for Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63
7.1.1 Parameter list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.1.2 Basic setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
7.1.3 Ethernet Operation Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
7.1.4 Open Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
7.2 TCP/IP Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
7.2.1 Establishing a connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
7.2.2 Communication process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7.2.3 Active open procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

9
7.2.4 Passive open procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
7.3 UDP/IP Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
7.3.1 Communication process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
7.3.2 Open procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
CHAPTER 8 CONNECTING MELSOFT PRODUCTS AND A GOT 81
8.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.2 Data Communication Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
CHAPTER 9 MC PROTOCOL COMMUNICATIONS 84
9.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
9.2 Communication Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.3 Data Communication Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.4 Parameter Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
CHAPTER 10 COMMUNICATIONS USING A FIXED BUFFER 87
10.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
10.1.1 Differences between the "Procedure Exist" and "No Procedure" control methods . . . . . . . . 87
10.2 Communication Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
10.3 Data Sending Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
10.4 Data Receiving Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
10.4.1 Data receiving using the main program (BUFRCV instruction) . . . . . . . . . . . . . . . . . . . . . . . 92
10.4.2 Data receiving using an interrupt program (BUFRCVS instruction) . . . . . . . . . . . . . . . . . . . . 95
10.5 Parameter Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97
10.5.1 Parameter setting when using an interrupt program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
10.6 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
10.6.1 Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
10.6.2 Application data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
10.7 Pairing Open. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
10.7.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
10.7.2 Parameter setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
10.8 Broadcast Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
10.8.1 Sending/receiving procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
10.8.2 Parameter setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
10.8.3 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
10.9 Example of Communications Using a Fixed Buffer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
10.9.1 System configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
10.9.2 Parameter setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
10.9.3 Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
CHAPTER 11 COMMUNICATIONS USING A RANDOM ACCESS BUFFER 120
11.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .120
11.2 Communication Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
11.2.1 How data is read from a connected device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

10
11.2.2 How a connected device writes data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
11.3 Parameter Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
11.4 Data Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
11.4.1 Header . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
11.4.2 Application data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
11.4.3 Examples of command and response formats. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
11.5 Precautions when Creating Programs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .133
11.6 Physical and Logical Addresses of a Random Access Buffer . . . . . . . . . . . . . . . . . . . . . . . .133
11.7 Example of Communications Using a Random Access Buffer . . . . . . . . . . . . . . . . . . . . . . . .134
CHAPTER 12 OTHER FUNCTIONS 135
12.1 Router Relay Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
12.1.1 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.1.2 Parameter settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
12.2 Communications Using an Auto-open UDP Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139
12.2.1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139
12.3 Remote Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .140
12.3.1 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140
12.3.2 Remote password setting processes (unlock and lock processes) . . . . . . . . . . . . . . . . . . . 141
12.3.3 Remote password check procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142
12.3.4 Differences in functions according to the remote password check status (enabled/disabled)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
12.3.5 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146
12.3.6 Parameter settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
12.4 Hub Connection Status Monitor Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .150
12.5 IP Address in Use Detection Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .151
12.6 Alive Check Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .153
CHAPTER 13 DEDICATED INSTRUCTIONS 155
13.1 List of Dedicated Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .155
13.2 Parameter Settings for Using Dedicated Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
13.2.1 When using data link instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
13.3 Precautions for Dedicated Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
13.4 Organization of the Dedicated Instruction Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .157
13.5 ZP.OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .158
13.6 ZP.CLOSE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .162
13.7 ZP.BUFSND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .165
13.8 ZP.BUFRCV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .169
13.9 Z.BUFRCVS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .173
13.10 ZP.ERRCLR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .175
13.11 ZP.ERRRD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .179
13.12 ZP.UINI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .182

11
CHAPTER 14 TROUBLESHOOTING 189
14.1 Before Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
14.2 Troubleshooting Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .189
14.3 Checking with the Module Error Collection Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .190
14.4 Checking the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .191
14.4.1 If the RUN LED turns off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
14.4.2 If the ERR. LED or COM.ERR. LED turns on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
14.4.3 If the SD/RD LED does not flash when data is sent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
14.5 Checking with a Display Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .193
14.6 Troubleshooting by Symptom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .194
14.6.1 Communications cannot be performed with the connected device.. . . . . . . . . . . . . . . . . . . 194
14.6.2 The E71 frequently fails to receive a message sent from the connected device. . . . . . . . . 195
14.6.3 A dedicated instruction is not completed.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
14.6.4 MC protocol communications cannot be performed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
14.6.5 Data cannot be sent with communications using a fixed buffer.. . . . . . . . . . . . . . . . . . . . . . 197
14.6.6 Data cannot be received with communications using a fixed buffer. . . . . . . . . . . . . . . . . . . 198
14.6.7 Communications using a random access buffer cannot be performed. . . . . . . . . . . . . . . . . 199
14.6.8 An e-mail cannot be sent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
14.6.9 An e-mail cannot be received. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201
14.6.10 Communications using data link instructions cannot be performed. . . . . . . . . . . . . . . . . . . 202
14.7 Error Code List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .203
14.7.1 End codes returned to a connected device during data communications . . . . . . . . . . . . . . 210
14.7.2 Abnormal codes returned during communications using an A-compatible 1E frame. . . . . . 213
14.7.3 Error codes stored in the buffer memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
14.8 Ethernet Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .237
14.9 Checking the Status of the E71 with the System Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . .238
14.10 How to Turn Off the COM.ERR. LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240
APPENDICES 241
Appendix 1 Processing Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241
Appendix 2 Port Numbers Used for the E71 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .245
Appendix 3 Initial Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246
Appendix 3.1 Setting the initial process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Appendix 3.2 Reinitialization process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250
Appendix 4 Line Status Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .256
Appendix 4.1 PING test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256
Appendix 4.2 Loopback test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261
Appendix 5 Self-Diagnostic Tests. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265
Appendix 5.1 Self-loopback test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265
Appendix 5.2 Hardware test (H/W Test). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266
Appendix 6 Differences from Ethernet Modules of Other Series . . . . . . . . . . . . . . . . . . . . . . . . . . .267
Appendix 6.1 Differences from a built-in Ethernet port LCPU. . . . . . . . . . . . . . . . . . . . . . . . 267
Appendix 6.2 Differences from Q series modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267
Appendix 6.3 Differences from QnA/A series modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . 267

12
Appendix 7 Sample Program on the Connected Device Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271
Appendix 7.1 When Visual C++®.NET is used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273
Appendix 7.2 When Visual Basic®.NET is used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282
Appendix 8 Checking the Serial Number, Function Version, and MAC address . . . . . . . . . . . . . . .291
Appendix 9 External Dimension Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .292
Appendix 10ASCII Code List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .293
INDEX 294
REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

13
MANUAL PAGE ORGANIZATION
In this manual, pages are organized and the symbols are used as shown below.
The following illustration is for explanation purpose only, and should not be referred to as an actual documentation.
*1 The mouse operation example is provided below.
The section of
the current page is shown.
The chapter of
the current page is shown.
"" is used for window
names and items.
[ ] is used for items
in the menu bar and
the project window.
shows operating
procedures.
shows reference
manuals.
shows notes that
requires attention.
shows mouse
operations.*1
shows
reference pages.
shows setting or
operating examples.
Ex.
shows useful
information.
A window selected in the view selection area is displayed.
View selection area
[Online] [Write to PLC...]
Select [Online] on the menu bar,
and then select [Write to PLC...].
Project window [Parameter]
[PLC Parameter]
Select [Project] from the view selection
area to open the Project window.
Menu bar
Ex.
Ex.
In the Project window, expand [Parameter] and
select [PLC Parameter].

14
Pages describing instructions are organized as shown below.
The following illustration is for explanation purpose only, and should not be referred to as an actual documentation.
• Instructions can be executed under the following conditions.
• The following devices can be used.
*1 For bit data, a bit-specified word device can be used. For example, is used for the bit
specification of a word device. (The bit number is specified in hexadecimal.)
For example, the bit 10 of D0 is specified by . However, bit specification cannot be used for timer (T), retentive
timer (ST), and counter (C).
Any time During on On the rising edge During off On the falling edge
No symbol
Internal device
File register
Constant
Bit*1 Word K, H $
X, Y, M, L, F, V, B T, ST, C, D, W R, ZR K, H$
Descriptions
of setting data
and data type
Instruction
name
Structure of the instruction
in the ladder mode
A device with is
applicable to
the instruction.
Execution condition of the instruction
Setting side
User: A device value is set by the user.
System: A device value is set
by the CPU module.
Word device.Bit No.
D0.A

15
For details on each device, refer to the following.
User's manual (function explanation, program fundamentals) for the CPU module used
The following data types can be used.
Data type Description
Bit Bit data or the start number of bit data
BIN 16-bit 16-bit binary data or the start number of word device
BIN 32-bit 32-bit binary data or the start number of double-word device
BCD 4-digit Four-digit binary-coded decimal data
BCD 8-digit Eight-digit binary-coded decimal data
Real number Floating-point data
Character string Character string data
Device name Device name data

16
TERM
Unless otherwise specified, this manual uses the following terms.
Term Description
ARP The abbreviation for Address Resolution Protocol. This protocol is used to obtain the MAC address
of Ethernet from an IP address.
BUFRCV The abbreviation for ZP.BUFRCV
BUFRCVS The abbreviation for Z.BUFRCVS
BUFSND The abbreviation for ZP.BUFSND
CLOSE The abbreviation for ZP.CLOSE
C24 Another term for the L series serial communication module
DNS The abbreviation for Domain Name System. This system is mainly used to convert host names on
the Internet or domain names used for e-mails to IP addresses.
ERRCLR The abbreviation for ZP.ERRCLR
ERRRD The abbreviation for ZP.ERRRD
E71 Another term for the LJ71E71-100
E71-connected station The abbreviation for the station where the E71 is connected
FTP The abbreviation for File Transfer Protocol. This protocol is used to transfer data files over a
network.
GX Developer The product name of the software package for the MELSEC programmable controllers
GX Works2
HTTP The abbreviation for Hyper Text Transfer Protocol. This protocol is used to send and receive
content, such as HTML files, between a Web browser and a Web server.
ICMP The abbreviation for Internet Control Message Protocol. This protocol is used to exchange
messages of errors in an IP network or other information related to an Ethernet network.
IP The abbreviation for Internet Protocol
MAC address A unique identifier assigned to each external device on a network. This address is also known as
an Ethernet hardware address.
MC protocol
The abbreviation for MELSEC Communication Protocol. This protocol is used to access MC
protocol supporting modules, such as the C24 and E71, or programmable controllers connected to
MC protocol supporting modules from external devices.
MELSECNET/H The abbreviation for a MELSECNET/H network system
MELSECNET/H remote I/O station A generic term for the QJ72LP25-25, QJ72LP25G, and QJ72BR15
MELSECNET/10 The abbreviation for a MELSECNET/10 network system
MRECV The abbreviation for ZP.MRECV
MSEND The abbreviation for ZP.MSEND
MX Component The abbreviation for MX Component (SW0D5C-ACT-E or later)
OPEN The abbreviation for ZP.OPEN
POP3 The abbreviation for Post Office Protocol Ver.3. This protocol is used to transfer e-mails from a
mail server to a local computer.
READ The abbreviation for JP.READ and GP.READ
RECV The abbreviation for JP.RECV and GP.RECV
RECVS The abbreviation for Z.RECVS
REQ The abbreviation for J.REQ, JP.REQ, G.REQ, and GP.REQ
SEND The abbreviation for JP.SEND and GP.SEND
SMTP The abbreviation for Simple Mail Transfer Protocol. This protocol is used to transfer e-mails over
the Internet.
SREAD The abbreviation for JP.SREAD and GP.SREAD
SWRITE The abbreviation for JP.SWRITE and GP.SWRITE

17
UINI The abbreviation for ZP.UINI
WRITE The abbreviation for JP.WRITE and GP.WRITE
ZNRD The abbreviation for J.ZNRD and JP.ZNRD
ZNWR The abbreviation for J.ZNWR and JP.ZNWR
Intelligent function module A module that has functions other than an input or output, such as an A/D converter module and
D/A converter module
Subnet mask
A number used to logically divide one network into multiple subnetworks and manage them easily.
The following Ethernet network systems can be configured:
• A small-scale Ethernet network system in which multiple network devices are connected
• A medium- or large-scale network system in which multiple small-scale network systems are
connected via routers or other network communication devices
Device A device (X, Y, M, D, or others) in a CPU module
Buffer memory A memory in an intelligent function module, where data (such as setting values and monitoring
values) exchanged with a CPU module are stored
Buffer memory address An address that indicates the storage location of data assigned to the buffer memory in an
intelligent function module
Programming tool Another term for GX Works2
Dedicated Instruction An instruction that simplifies programming for using functions of intelligent function modules
Term Description

18
PACKING LIST
The following items are included in the package of this product. Before use, check that all the items are included.
LJ71E71-100
LJ71E71-100 Before Using the Product