Hitachi EH-150 Series Instructions for use

HITACHI PROGRAMMABLE CONTROLLER
Serial Communication Module (EH-SIO)
APPLICATION MANUAL
NJI-443F(X)

Warranty period and coverage
The warranty period is the shorter period either 18 months from the date of manufacture or 12 months from the
date of installation.
However within the warranty period, the warranty will be void if the fault is due to;
(1) Incorrect use as directed in this manual and the application manual.
(2) Malfunction or failure of external other devices than this unit.
(3) Attempted repair by unauthorized personnel.
(4) Natural disasters.
The warranty is for the PLC only, any damage caused to third party equipment by malfunction of the PLC is not
covered by the warranty.
Repair
Any examination or repair after the warranty period is not covered. And within the warranty period any repair and
examination which results in information showing the fault was caused by any of the items mentioned above, the
repair and examination cost are not covered. If you have any questions regarding the warranty please contact either
your supplier or the local Hitachi Distributor. (Depending on failure part, examination might be impossible.)
Ordering parts or asking questions
When contacting us for repair, ordering parts or inquiring about other items, please have the following details
ready before contacting the place of purchase.
(1) Model
(2) Manufacturing number (MFG no.)
(3) Details of the malfunction
Warning
(1) This manual may not be reproduced in its entirety or any portion thereof without prior
consent.
(2) The content of this document may be changed without notice.
(3) This document has been created with utmost care. However, if errors or questionable areas
are found, please contact us.
MS-DOS, Windows, and Windows NTare registered trademarks of America and other
registered countries of Microsoft Corp. of the United States.

Safety Precautions
Read this manual and related documents thoroughly before installing, operating, performing preventive maintenance or
performing inspection, and be sure to use the unit correctly. Use this product after acquiring adequate knowledge of
the unit, all safety information, and all cautionary information. Also, make sure this manual enters the possession of
the chief person in charge of safety maintenance.
Safety caution items are classified as “Danger” and “Caution” in this document.
DANGER
: Cases where if handled incorrectly a dangerous circumstance may be created, resulting in
possible death or severe injury.
CAUTION
: Cases where if handled incorrectly a dangerous circumstance may be created, resulting in
possible minor to medium injury to the body, or only mechanical damage.
However, depending on the circumstances, items marked with may result in major accidents.
In any case, they both contain important information, so please follow them closely.
Icons for prohibited items and required items are shown below:
: Indicates prohibited items (items that may not be performed). For example, when open flames are prohibited,
is shown.
: Indicates required items (items that must be performed). For example, when grounding must be performed,
is shown.
CAUTION

1. Attachments
CAUTION
• To be used in environments stipulated in the catalogue and in this document.
Usage in environments that subject the equipment to high temperatures, high humidity,
dirt and dust, corrosive gas, vibrations and shocks may result in electric shocks, the
outbreak of fire and malfunctions.
• Ensure that all attachments are made in accordance with the instructions provided in
the instruction manual. If the attachment procedures are ill-prepared, it may result in
dropped equipment, damage and malfunctions.
• Ensure that cable clippings and other foreign objects do not enter the equipment.
Failure to observe this may result in the outbreak of fire, damage and malfunctions.
2. Wiring
CAUTION
• Ensure that the equipment is connected to a rated power supply.
Connecting the equipment to non-rated power supplies may result in the outbreak of
fire.
• Ensure that all wiring procedures are performed by qualified technicians.
Wrong wiring may result in the outbreak of fire, damage and electric shocks.
• Ensure that the coaxial cable is shielded when installing the link module.
As only one side of the shielded cable is to be earthed as a basic principle, attach the
earth to the RXD (receiving side.)
• Cover coaxial cables for transmitting between CPU link modules with cloth using a different route
than that used by other dynamic or signal cables. If it is not possible to establish a different route, use
metal pipes when connecting the wiring.
3. Maintenance
PROHIBITED
• Never dismantle or remodel the equipment.
Failure to observe this may result in the outbreak of fire, damage and malfunctions.
CAUTION
• Ensure that the power supply to the modules and unit s that are to be disconnected has
been switched off.
Failure to observe this may result in electric shocks, malfunctions and damage.

REVISION TABLE
REV
DATE
CONTENTS
-
2004.03
First release
A
2004.07
The function supported by Software Ver. 2.0 was added.
- Modbus (ASCII mode)
- Modbus Slave mode (I/O mapping)
- Hi-Protocol mode
- Simple data link mode
B
2004.11
The function supported by Software Ver. 2.1 was added.
- Hi-Protocol mode (Transmission control procedure 2)
- Self-check mode
C
2004.12
Free-protocol Mode
- The sample program of initial setting is corrected.
- Notes about TRNS 9 command are added.
Modbus master Mode
- The sample program of initial setting is corrected.
- The sample program of query transmitting is added.
D
2008.09
Description to use EH-SIO by EHV-CPU is added
Writing errors on the wire connection of the loop back cable used in the
self-diagnosis mode are modified
Modbus Slave Mode
- The query example and response of function code 0x03 are corrected.
E
2014.09
Example of cable connection for RS-422/485 is corrected.
Add expansion communication setting function
Simple data link Mode
- The sample program of initial setting for EHV is corrected.
F
2019.10
The functions supported by Software Ver. 2.0 / Hardware Rev. 10 are added.
- Communication interface for Port1 can be selectable (RS-232C / RS-422,485)
- XRS1 / XRS2 bit are added to status register
- In Modbus slave mode, Internal output which is accessed by function code 06
can be selectable. (WM /WR)
Corrected errors in some sentence and words.

Contents
Chapter 1 Introduction.......................................................................................................1-1 to 1-6
1.1 Before use .......................................................................................................................................................1-2
1.2 Feature ............................................................................................................................................................1-3
1.3 Supported CPU module ..................................................................................................................................1-5
1.4 Confirm software version of EH-SIO .............................................................................................................1-6
Chapter 2 Specification......................................................................................................2-1 to 2-2
2.1 General specification.......................................................................................................................................2-1
2.2 Communication specification..........................................................................................................................2-2
Chapter 3 Name and function of each part ........................................................................3-1 to 3-2
Chapter 4 Installation.......................................................................................................4-1 to 4-10
4.1 Setup of communication setting switch ..........................................................................................................4-1
4.2 Installation of module .....................................................................................................................................4-3
4.3 Connection of communication port.................................................................................................................4-4
4.3.1 Connection of RS-232C interface...........................................................................................................4-4
4.3.2 Connection of RS-422 / 485 interface ....................................................................................................4-6
Chapter 5 Control of EH-SIO...........................................................................................5-1 to 5-12
5.1 EH-SIO Control command (TRNS 9).............................................................................................................5-1
5.1.1 Function of command.............................................................................................................................5-1
5.1.2 TRNS 9 Command format......................................................................................................................5-3
5.2 Input / Output register.....................................................................................................................................5-8
5.2.1 Register configuration ............................................................................................................................5-9
5.2.2 Detail of input register..........................................................................................................................5-10
5.2.3 Detail of output register........................................................................................................................5-12
Chapter 6 Communication Mode...................................................................................6-1 to 6-102
6.1 Introduction.....................................................................................................................................................6-1
6.2 Free protocol mode .........................................................................................................................................6-3
6.2.1 Overview ................................................................................................................................................6-3
6.2.2 User project structure..............................................................................................................................6-5
6.2.3 Initial setting...........................................................................................................................................6-6
6.2.4 Communication start.............................................................................................................................6-15
6.2.5 Receive data..........................................................................................................................................6-16
6.2.6 Send data...............................................................................................................................................6-21
6.2.7 Error detection in free protocol mode...................................................................................................6-27

6.3 Modbus master mode....................................................................................................................................6-29
6.3.1 Overview ..............................................................................................................................................6-29
6.3.2 User project structure............................................................................................................................6-30
6.3.3 Initial setting.........................................................................................................................................6-31
6.3.4 Send Query, Receive Response ............................................................................................................6-35
6.3.5 Error detection in modbus master mode ...............................................................................................6-49
6.4 Modbus slave mode ......................................................................................................................................6-50
6.4.1 Overview ..............................................................................................................................................6-50
6.4.2 User project structure............................................................................................................................6-53
6.4.3 Initial setting.........................................................................................................................................6-54
6.4.4 Response...............................................................................................................................................6-63
6.4.5 Error detection in modbus slave mode..................................................................................................6-72
6.5 Hi-Protocol mode..........................................................................................................................................6-74
6.5.1 Basic function.......................................................................................................................................6-74
6.5.2 Performance..........................................................................................................................................6-76
6.5.3 User project structure............................................................................................................................6-77
6.5.4 Initial setting.........................................................................................................................................6-78
6.5.5 Error detection in Hi-Protocol mode.....................................................................................................6-84
6.6 Simple data link mode...................................................................................................................................6-86
6.6.1 Abstract of simple data link..................................................................................................................6-87
6.6.2 Performance specification.....................................................................................................................6-89
6.6.3 User project structure............................................................................................................................6-91
6.6.4 Master configuration (Initial setting of EH-SIO)..................................................................................6-92
6.6.5 Configuration of slave station...............................................................................................................6-99
6.6.6 Error detection in simple data link mode............................................................................................6-101
Chapter 7 System setup..................................................................................................7-1 to 7-12
7.1 Trial Run.........................................................................................................................................................7-1
7.2 Error indication...............................................................................................................................................7-2
7.3 Troubleshooting ..............................................................................................................................................7-4
Chapter 8 Daily and Periodic Inspection............................................................................8-1 to 8-8
8.1 Daily inspection ..............................................................................................................................................8-1
8.2 Periodic inspection ........................................................................................................................................8-2
8.3 Self-check mode ............................................................................................................................................8-3
8.3.1 Check item..............................................................................................................................................8-3
8.3.2 Preparation before self-check .................................................................................................................8-4
8.3.3 Starting of self-check mode....................................................................................................................8-5
8.3.4 Result of self-check ................................................................................................................................8-6

Appendix .......................................................................................................................A-1 to A-30
A.1 ASCII code list...............................................................................................................................................A-1
A.2 Outline of Modbus protocol...........................................................................................................................A-2
A.2.1 Modbus message configuration .............................................................................................................A-3
A.2.2 Function code ........................................................................................................................................A-3
A.2.3 Error check ............................................................................................................................................A-4
A.2.4 Response message .................................................................................................................................A-6
A.3 H series protocol (Hi-Protocol)......................................................................................................................A-7
A.3.1 Outline ...................................................................................................................................................A-7
A.3.2 Hi-Protocol message configuration .......................................................................................................A-8
A.3.3 Basic specification of transmission control procedure.........................................................................A-10
A.3.4 EH-SIO support task code details........................................................................................................A-12
A.3.5 I/O Code list.........................................................................................................................................A-27
A.4 TRNS 9 Command list.................................................................................................................................A-28
A.5 TRNS 9 Return code....................................................................................................................................A-29

M E M O

1 - 1
Chapter 1 Introduction
Thank you for using the Hitachi EH-150 Programmable Controller series (It abbreviates to PLC after this.)
This manual explains how to use the serial communication module (It abbreviates to EH-SIO after this.) with the
Hitachi EH-150 Programmable Controller. Read this manual thoroughly and keep for installation operations,
maintenance checks and other procedures. The following documentation related to PLC is also available and should be
used together with this manual.
Table 1.1 List of explanatory documentation
Items
Related manuals
Manual
number *
EHV
series
EHV-CPU
EH-150 EHV-CPU Application manual
NJI-481*(X)
EH-150 EHV-CPU Programming manual
NJI-482*(X)
Programming
software
EH-150 EHV series MICRO-EHV series Ladder Programming Software
Control Editor Instruction manual
NJI-537*(X)
Control Editor Polynomials Edit Manual
NJI-640*(X)
Control Editor Simulator Manual
NJI-641*(X)
EH-150
series
EH-150 CPU
EH-150 Application manual
NJI-281*(X)
Programming
software
LADDER EDITOR for Windows® Instruction manual
NJI-342*(X)
HX
series
HX CPU
HX series APPLICATION MANUAL (Hardware)
NJI-637*(X)
HX series APPLICATION MANUAL (Software)
NJI-638*(X)
HX series APPLICATION MANUAL (Motion)
NJI-650*(X)
HX series APPLICATION MANUAL (Hybrid)
NJI-653*(X)
“* ”is version starting from A, B, .

Chapter 1 Introduction
1 - 2
1.1 Before use
Great care has been taken in the manufacture of this product, but it is advised that the following points are checked
immediately after purchase.
1. Is the model the same one that you ordered?
2. Has the product been damaged in any way?
3. Are any of the accessories listed in table 1.2 missing?
Contact your dealer in the event of any defects being discovered.
Table 1.2 List of accessories supplied with the EH-SIO
No.
Products name
Model name
Outlook
Pcs
Remarks
1
Serial I/O Interface
Module
EH-SIO
1
2
Connector for
RS-422 / 485 Port
(Cable side)
BL3.5/6F
1
Widemuller
production
3
Instruction manual
NJI-442
1
« Note »
In order to use EH-SIO, HX series (Ver. 3.5.8.26 or newer) / EHV series / EH-CPU548 (Ver. E402 or
newer) / EH-CPU516 (Ver. E202 or newer) is needed. Please confirm the ROM version (software
version) of your CPU module before using EH-SIO. (The terms “CPU module”and“CPU”in this
manual mean both EH-CPU and EHV-CPU.)
If the CPU module of ROM version (software version) other than the above is used, EH-SIO does not
work. Please refer to "1.3 Supported CPU module" for details.

Chapter 1 Introduction
1 - 3
1.2 Feature
EH-SIO is the serial communication module with the following features.
2 communication ports
There are two communication ports in EH-SIO. The port 1* and 2 can be used as RS-232C, RS-422 or 485 interface.
Two communication ports can be operated independently and can assign a different function each other.
* The hardware before Rev. 10 supports RS-232C only.
Communication operation by user program
Communication with external device is performed by user program. It is controlled by special command "TRNS 9".
Figure 1.1 System configuration of general-purpose communication
Exclusive protocol is supported.
Modbus protocol is supported by EH-SIO.
Since EH-SIO can be configured as master or slave, application range of EH-150 will be expanded, such as
supervising by host computer or controlling modbus slave.
Figure.1.2 System configuration of Modbus protocol application
Reference: What isModbus?
The Modbus protocol is a communication protocol developed by Modicon Inc. (AEG Schneider Automation
International S.A.S.). Only the communication protocol is defined as the modbus protocol. And physical layers,
such as a communication medium, are not specified. Please refer to the appendix in the end of this book about a
Modbus protocol outline. Please refer to "Modbus Protocol Reference Guide" (PI-MBUS -300) of Modicon Inc.
issue for further information.
RS-485
Max. 32 units
RS-232C
Bar-code
Reader
Personal
computer
RS-422

Chapter 1 Introduction
1 - 4
Exclusive protocol for H / EH series (Hi-Protocol) is supported.
EH-SIO can communicate with HMI (Human Machine Interface) which is supports H / EH series communication
procedure (transmission control procedure 1).
For example, it is convenient when using two or more touch panels to be connected. Moreover, since EH-SIO can be
mounted also in an expansion base, system expansion is very flexible.
* Transmission control procedures 2 is supported by the software version 2.1 or newer.
Figure.1.3 System configuration of Hi-Protocol application
« Note »
Programming tools, such as the LADDER EDITOR, are not connectable with EH-SIO.
Simple Data Link function
The simple data link is the function to make EH-SIO into a master and to exchange I/O information for the slave by
communication.
The models of PLC used as the slave is PLC which is supporting transmission control procedure 2 (with station No.).
Completion of initial setting of EH-SIO which becomes a master updates I/O area automatically by the system.
Figure.1.4 System configuration of Simple Data Link
St.No. 01
St.No. 02
St.No. 31
RS-485
Max. 31 units
St.No. 18

Chapter 1 Introduction
1 - 5
1.3 Supported CPU module
The function of EH-SIO depends on software version of CPU shown in the following table. The function of EH-SIO
and the software version of EH-CPU which can be responded are shown in the following table.
And all software version for EHV-CPU can use all functions for EH-SIO.
Table.1.3 The function of EH-SIO and correspondence CPU module
Supported CPU module *
Function of EH-SIO
Software version
EHV-CPU series
1.0
2.0
2.1
2.3
or newer
EH-CPU516 (Ver. E2.02 - E2.06)
EH-CPU516 (Ver. E2.07 or newer)
EH-CPU548 (Ver. E4.02 - E4.05)
EH-CPU548 (Ver. E4.06 or newer)
Free-Protocol






Modbus Master
(RTU )






Modbus Master
(ASCII )





Modbus Slave
(RTU )






Modbus Slave
(ASCII)





Modbus Slave
(I/O mapping)





Hi-Protocol
(procedure 1)




Hi-Protocol
(procedure 2)



Hi-Protocol
(Expansion setting)


Simple data link




Self-check


Not depend on the software version of CPU.
* HX-CPU (Software ver. 3.5.8.26 or newer) supports EH-SIO. However, how to make the program is totally different from
EH / EHV-CPU series. As to the program for EH-SIO by using HX-CPU, please refer to HX Series APPLICATION MANUAL.
« Remark »
As for the operating of combining with the EH-CPU which is not supporting the function of EH-SIO, please refer to
"Combination with EH-CPU" of "7.3 Troubleshooting".

Chapter 1 Introduction
1 - 6
1.4 Confirm software version of EH-SIO
The software version is indicated in the main label of the module side.
In addition, it can be monitored in WXus3 before initial setting is completed.
* u : Unit No., s : Slot No.
Ex.) WXus3 : H0010 Software ver. 1.0
WXus3 : H0020 Software ver. 2.0
« Note »
Software version cannot be monitored after initial setting is completed. The following procedures are required to
confirm a version after initial setting completion. (in the status of the waiting for initial setting.)
Free protocol mode  To stop CPU module
Modbus master mode  To stop CPU module
Modbus slave mode  To reset EH-SIO
Hi-Protocol mode  To reset EH-SIO
Simple data link mode  To reset EH-SIO
Reference: Description of I/ONo.
In this book, the sign "u" and "s" is used for expressing arbitrary I/O number. "u" means unit number and "s" means
slot number.
I/O assignment of EH-SIO is WORD 4W/4W. For example, if EH-SIO is mounted in the unit 1 and the slot 7, I/O No.
is set to WX170-WX173 and WY174-WY177.
(In this book, it is expressed as WXus0 - WXus3 and WYus4 - WYus7.)

2 - 1
Chapter 2 Specification
The general specification and transmission specification of EH-SIO are shown below.
2.1 General specification
Table 2.1 General Specification
ITEM
SPECIFICATION
Operating temperature
0 to 55C
Preserving temperature
–10 to 75C
Operating humidity
No condensation 5 to 95% RH
Preserving humidity
No condensation 5 to 95% RH
Current consumption
5V DC Approx. 250 mA
Mounted slot position
Basic base, Expansion base
(Not possible on remote base. (EH-IOCD(2), EH-IOCP(2), EH-IOCA))
The number of mounting
With no restrictions until maximum of I/O numbers.
(In case of Modbus slave mode, Hi-Protocol mode*1*2, Simple Data Link
mode*1, Max. 8 units)
Number of occupation permitted
I/O points.
128 points.
I/O assignment
LADDER EDITOR Word 4W/4W
Control Editor X4Y4W(SIO)
Unusual detection
Processor abnormal, Watch dog timer error, System ROM/RAM abnormal,
Communication data error ( parity error, framing error, over run, and so on.)
Supported communication mode
Free protocol, Modbus (RTU/ASCII*1) master / slave,
Hi-Protocol (Transmission control procedure 1*1/ 2*2),
Simple Data Link*1
*1 : This function supported from software ver. 2.0.
*2 : This function supported from software ver. 2.1.
« Note »
Total current consumption can be over the capacity of power supply module depending on module configuration. Be
sure to check that the total current is less than the maximum output current of power supply module.
In order to use a part of function of EH-SIO supported by software ver. 2.0, CPU module corresponding to this
function is required. Please refer to "1.3 Supported CPU module" for details.

Chapter 2 Specification
2 - 2
2.2 Communication specification
Table 2.2 Communication specification
ITEM
SPECIFICATION
Port 1 *1
Port 2 *2
Interface
Conforms to
RS-232C
Conforms to
RS-422 / 485
Conforms to
RS-232C
Conforms to
RS-422 / 485
Transmission speed
300, 600, 1,200, 2,400, 4,800, 9,600, 19,200, 38,400, 57,600 bps
Startup method
One-sided startup using the host side command
Transmission method
Serial transmission ( bit serial transmission )
Transmission code
ASCII, binary
Transmission format
configuration
Input buffer
1,024 byte/Port
Output buffer
1,024 byte/Port
Error control
Vertical parity check, framing check, overrun check,
Input buffer full check, Message error check, Timeout error check
Connection mode
1:1
1:N
(Max.32 units.)
1:1
1:N
(Max.32 units.)
Max cable length
15 m
500 m
15 m
500 m
Body side connector
TM5RSB-1616
8-pin modular connector
SL3.5/6/90F
Pitch 3.5, 6-poles
with screw
*1 Communication interface of Port 1 is selectable in hardware Rev. 10 or newer. The hardware before Rev. 10 supports
RS-232C only. Communication interface can be selected either a RS-232C port or RS-422/485 port by DIP Sw.
RS-422 and RS-485 are switched by wiring.
*2 Port 2 chooses either a RS-232C port or RS-422/485 port by DIP Sw. RS-422 and RS-485 are switched by wiring.
20
21
22
23
24
25
26
27
Transmission data 7 or 8 bits
a
b
c
a: Start bit
b: Parity bit (Even, Odd, None)
c: Stop bit ( 1 or 2 )

3 - 1
Chapter 3 Name and function of each part
Name and function of each part
Type
EH-SIO
Mass
Approx. 0.13 kg
Dimensions
(mm (in.))
No.
Name
Function
Remark
[1]
Lock button
When dismounting the module from a base unit, press
this button and lift up the module.
The module can be fixed firmly by a screw (M4, 10 mm
(0.39 in.)).
[2]
State display LED
This LED displays the status of module.
[3]
Reset switch
Resets when the module is abnormal.
[4]
Connector
RS-232C Port
Used to connect the RS-232C I/F.
Selection with
Communication
Setting Switch
for Port 1
RS-422/485 Port *
Used to connect the RS-422 I/F or RS-485 I/F.
[5]
Connector
RS-232C Port
Used to connect the RS-232C I/F.
Selection with
Communication
Setting Switch
[6]
for Port2
RS-422/485 Port
Used to connect the RS-422 I/F or RS-485 I/F.
[7]
Communication setting switch
The communication specification is configured by this
switch.
Please set according to connected devices after the power
off and dismounting from a base unit.
* Communication interface of Port 1 is selectable in hardware Rev. 10 or newer. The hardware before Rev. 10 supports
RS-232C only.
[1] Lock button
[2] State display LED
[3] Reset switch
[4] Connector for Port1
(RS-232C or RS-422/485)
[5] Connector for Port2
(RS-232C)
[6] Connector for Port2
(RS-422/485)
[7] Communication setting switch
Selectable
30 (1.18)
100 (3.94)
95 (3.74)

Chapter 3 Name and function of each part
3 - 2
Display of LED
Table 3.1 Contents of LED display
Appearance
LED
Contents of display
Details
Color
Hard Rev. 04 or before
SERIAL I/O
EH-SIO
MDE
CDE
SD2
RD2
WDE
MB1
HP1
MB2
HP2
MS1
MS2
422
LNK
SD1
RD1
Hard Rev. 10 or newer
SERIAL I/O
EH-SIO
MDE
CDE
SD2
RD2
WDE
MB1
HP1
MB2
HP2
MS1
4221
MS2
4222
LNK
SD1
RD1
LNK
Simple Data Link Mode *1
Lighting when the simple data link mode setting
Green
WDE
Watchdog Timer Error
Lighting when MPU error (Serious failure)
Port 1, Port 2 combined use
Red
MDE
Module Error
Lighting when module error (Serious failure)
Port 1, Port 2 combined use
Red
CDE
Command Error
Lighting when the command error and so on
(Minor failure) Port 1, Port 2 combined use
Red
SD1
Send Data
Flickering when sending data (Port1)
Green
RD1
Receive Data
Flickering when receiving data (Port1)
Green
MB1
During Modbus Mode
Lighting on Modbus mode setting (Port1)
Green
HP1
During Hi-Protocol
Mode *1
Lighting on Hi-Protocol mode setting (Port1)
Green
MS1
During Modbus Master
Mode
Lighting on Modbus Master mode setting (Port1)
Green
4221
Select RS-422 / 485 I/F*2
Lighting when select the RS-422 / 485 I/F (Port1)
Green
SD2
Send Data
Flickering when sending data (Port2)
Green
RD2
Receive Data
Flickering when receiving data (Port2)
Green
MB2
During Modbus Mode
Lighting on Modbus mode setting (Port2)
Green
HP2
During Hi-Protocol
Mode *1
Lighting on Hi-Protocol mode setting (Port2)
Green
MS2
During Modbus Master
Mode
Lighting on Modbus Master mode setting (Port2)
Green
4222
Select RS-422 / 485 I/F*2
Lighting when select the RS-422 / 485 I/F (Port2)
Green
*1 “Hi-Protocol” and “Simple data link” mode are supported by software ver. 2.0 or newer.
*2 Added / Changed from hardware Rev. 10.
When power supply turned on, state display LED except ERR, RD, SD are turned on. ("4221", "4222" are turned on or
off according to the state of a communication setting switch.) By executing initial setting, LED other than the set-up
communication mode turned off.
Please refer to "Chapter 7 System setup" about error LED (WDE, MDE, CDE).