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JAPANESE

ENGLISH

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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.

HEAD OFFICE
HIMEJI WORKS

 : TOKYO BUILDING, 2-7-3 MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
 : 840, CHIYODA CHO, HIMEJI, JAPAN

FX

2N

-232-BD

USER’S GUIDE

JY992D63201E

This manual contains text, diagrams and explanations which will guide the reader in the correct 
installation, safe use and operation of the FX

2N

-232-BD (hereafter abbreviated to "232BD") and should be

read and understood before attempting to install or use the unit. Further information can be found in the
associated manuals mentioned below.
Specifications are subject to change without notice

Safety guidelines for the user and protection of the FX

2N

-232-BD.

This manual has been written to be used by trained and competent personnel. The definition of such a
person or persons is as follows:

a) Any engineer using the product associated with this manual, should be of a competent nature,

trained and qualified to the local and national standards. These engineers should be fully aware of
all aspects of safety with regards to automated equipment.

b) Any commissioning or service engineer must be of a competent nature, trained and qualified to

the local and national standards.

c)

All operators of the completed equipment should be trained to use this product in a safe and
coordinated manner in compliance to established safety practices.

Note:

The term ‘completed equipment’ refers to a third party constructed device which contains or uses
the product associated with this manual.

Notes on the Symbols Used in this Manual

At various times throughout this manual certain symbols will be used to highlight points of information
which are intended to ensure the users personal safety and protect the integrity of equipment.

1) Indicates that the identified danger 

WILL

 cause physical and property damage.

2) Indicates that the identified danger could 

POSSIBLY

 cause physical and property

damage.

Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential damage
that may arise as a result of the installation or use of this equipment.

All examples and diagrams shown in this manual are intended only as an aid to understanding the
text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for the actual use of
the product based on these illustrative examples.

Please contact a Mitsubishi distributor for more information concerning applications in life critical
situations or high reliability.

Associated Manuals

PROGRAMMING MANUAL 

ΙΙ

, or FX Series User's Manual - Data Communication Edition mentioned

below are not provided in sets with a product.
Contact our agent where the product was purchased to request the manuals accordingly

Indispensable manual

Manual name

Manual No.

Description

FX Series User's 
Manual - Data 
Communication 
Edition

JY997D16901

Describes contents related to communication available 
in FX Series PLC such as wiring, communication 
setting and program examples. 
(Make sure to read this manual.)

FX

2N

 Series 

Hardware Manual

JY992D66301

Describes contents related to hardware of FX

2N

 Series 

PLC such as specifications, wiring and installation.

FX

 

Programming 

Manual 

II

JY992D88101

Describes instructions in FX

1S

/FX

1N

/FX

2N

/FX

2NC

 

Series.

This manual describes the installation and specifications of the 232BD. 
For details on wiring with communication equipment, system configuration and communication setting, and program 
examples, refer to the "FX Series User's Manual - Data Communication Edition".

1. Outline of Product

The 232BD is an RS-232C communication board with a 9-Pin D-Sub. It is an insulated unit for signal
exchange. Connected to the main unit of the FX

2N

 Series PLC, 

it enables serial data transfer between the PLC and equipment via an RS-232C port.

1.1 Communication Functions and Applicable PLC 

(Available in indicated version or later)

1.2 Outside dimensions and name of each part

The communication connector of the 232BD is the D-sub, 9-pin socket type. The table below shows the
pin arrangement.

1.3 System configuration

Only one function expansion board can be used for one main unit of FX

2N

FX

2N

-232-BD cannot be used by the plural. Other expansion boards cannot be used together with 

FX

2N

-232-BD. For the system configuration, refer to the FX Series User's Manual - Data Communication

Edition offered separately.

2. Installation

Caution

• Use in the environments specified under the general specification in the manual. 

Do not use the product in environments with excessive or conductive dust, corrosive or
flammable gas, oily smoke, moisture or rain, excessive heat, regular impact shocks or
excessive vibration, as it may result in electrical shock, fire, malfunction, damage or
deterioration on the product.

• Make sure to shut off the power outside the product before installing or wiring it. 

Otherwise, electric shock or serious damage to on the product may occur.

• Never drop wire chips or shavings into the vent slits when drilling screw holes or performing

wiring, as they may cause fire, breakdown, or malfunction.

Securely install the 232BD to the designated port. 
Poor connection may cause malfunction.

Communication 

type

FX

2N

Function

Computer link

V1.06

Data transfer via link protocol between PLC and computer
 (specified as the master station).

No protocol 
communication

V1.06

Serial communication without protocol between PLC and equipment via RS-232C 
interface.

Optional 
programming port

First 

product

Optional port available for suitable programming tool when 232ADP is connected to 
PLC.

Remote 
maintenance

First 

product

Program transfer or monitoring enabled via modem and phone line connected to serial 
port of PLC.

Unit: mm (inches)

Mounting hole (2-

φ

3.5)

RXD LED: Lit during receive.

TXD LED: Lit during send.

Connector for RS-232C equipment 
The top face of this connector is higher than the top face
of the PLC panel cover by approximately 7 mm (0.27").

Hole for connector fixing screw (#4-40UNC)

Connector for PLC 

Accessories: Top cover for board   1

M3 screw to mount board   2
M3 screw to fix top cover   1

54(2.13"

)

46(1.81"

)

39(1.54"

)

35(1.38")

2 3

1

4

1

5

24.99(0.98"

)

±

0

.3(0.012"

)

6

Pin No.

Signal

Name

Function

1

CD

Receive carrier 
detection

Turns ON when carrier for data 
receive is detected.

2

RD(RXD)

Receive data 
input

Receive data 
(RS-232C equipment 

 232BD)

3

SD(TXD)

Send data input

Send data 
(232BD 

 RS-232C equipment)

4

ER(DTR)

Send request

Turns ON when RS-232C equipment 
becomes ready for receive.

5

SG(GND)

Signal ground

Signal ground

6

DR(DSR)

Send enabled

Turns ON when send request is given 
to RS-232C equipment

7,8,9

Not used

1

2

3

4

5

6

7

8

9

2.1 Installation procedure

Turn OFF the power of the programmable controller, and mount the 232BD using the following procedure.

Remove the panel cover from the top face of the main unit.

Connect the 232BD to the board mounting connector provided on the
base unit.

Fix the 232BD to the main unit using the M3 self-tapping screws
provided, fitting the mounting bracket and the round crimp-style terminal
with the ground cable as shown in the figure on the right.
Make sure that the crimp-style terminal is attached in the direction
shown in the figure on the right, and that the ground cable extends from
the unit shown in the figure below.
Tightening torque: 0.3 to 0.6 N

y

m

Cut out the hole provided on the left portion of the panel cover using a tool such as nippers and cutter
so that the terminal block can be seen. The top face of this connector is higher than the top face of the
panel cover of the programmable controller by approximately 7 mm (0.27").

3. Specifications

3.1 Environmental specifications

The environmental specifications are equivalent to those of the PLC main unit. (Refer to the manual of the
PLC main unit.)

3.2 Power supply specifications

5V DC, 20 mA is supplied as the power from the PLC.

3.3 Performance specifications

4. CAUTION FOR USE

1) When programming tool is connected the 232BD, do not use any other communication format or

parameters. If communication format or parameters is set, programming is not possible.

2) Only one programming tool (such as FX-10P, FX-20P, etc.) should be connected to either the pro-

gramming port or the port provided on the 232BD. If a programming tool is connected to both connec-
tors, the following may occur.

a) The program inside the programmable controller may not be consistent with the program inside

the programming tool. If the program is modified or the set value for the timer or the counter is
modified, a part of the program may be damaged and the programmable controller may
malfunction.

b) When the sampling trace function of the programmable controller is used from both ports, the

correct sampling trace result cannot be obtained.

Item

Description

Transmission standard

In conformance to RS-232C

Maximum transmission 
distance

15 m (49ft) maximum

External equipment 
connection method

D-sub, 9-pin type (pin socket: manufactured by JST Mfg.) with JES-9P-
2A3A (#4-40UNC, inch screw thread type)

Indication (LED)

RXD, TXD

Communication method

Full-duplex (When the version of PLC(FX

2N

) is Ver. 2.00 or later) / 

Half-duplex (When the version of PLC(FX

2N

) is earlier than Ver. 2.00) 

Communication 
procedure

Non-procedure, dedicated protocol 1 procedure, dedicated protocol 4 
procedure, protocol for programming tool 

Baud rate

Following baud rate can be specified when using computer link or no 
protocol communication: 300/600/1200/2400/4800/9600/19200 bps

Insulation

Not insulated

232BD

5.5mm(0.22") 

or less

For M3(0.14")

16mm(0.63") or less

Grounding
Cable

Manual number : JY992D63201

Manual revision : E

Date

:  AUGUST 2006

Summary of Contents for Melsec-FX2N-232-BD

Page 1: ...sive or flammable gas oily smoke moisture or rain excessive heat regular impact shocks or excessive vibration as it may result in electrical shock fire malfunction damage or deterioration on the product Make sure to shut off the power outside the product before installing or wiring it Otherwise electric shock or serious damage to on the product may occur Never drop wire chips or shavings into the ...

Page 2: ...sive or flammable gas oily smoke moisture or rain excessive heat regular impact shocks or excessive vibration as it may result in electrical shock fire malfunction damage or deterioration on the product Make sure to shut off the power outside the product before installing or wiring it Otherwise electric shock or serious damage to on the product may occur Never drop wire chips or shavings into the ...

Page 3: ...sive or flammable gas oily smoke moisture or rain excessive heat regular impact shocks or excessive vibration as it may result in electrical shock fire malfunction damage or deterioration on the product Make sure to shut off the power outside the product before installing or wiring it Otherwise electric shock or serious damage to on the product may occur Never drop wire chips or shavings into the ...

Page 4: ...sive or flammable gas oily smoke moisture or rain excessive heat regular impact shocks or excessive vibration as it may result in electrical shock fire malfunction damage or deterioration on the product Make sure to shut off the power outside the product before installing or wiring it Otherwise electric shock or serious damage to on the product may occur Never drop wire chips or shavings into the ...

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