Installation Manual for Analog Input/
Output Special Function Modules
Art-no.: 202745 ENG, Version A, 17012007
For qualified staff only
This manual is only intended for use by properly trained and qualified elec-
trical technicians who are fully acquainted with automation technology
safety standards. All work with the hardware described, including system
design, installation, setup, maintenance, service and testing, may only be
performed by trained electrical technicians with approved qualifications
who are fully acquainted with the applicable automation technology safety
standards and regulations.
Proper use of equipment
The programmable controllers (PLC) of the MELSEC FX
series are only
intended for the specific applications explicitly described in this manual or
the manuals listed below. Please take care to observe all the installation
and operating parameters specified in the manual. All products are
designed, manufactured, tested and documentated in agreement with the
safety regulations. Any modification of the hardware or software or disre-
garding of the safety warnings given in this manual or printed on the prod-
uct can cause injury to persons or damage to equipment or other property.
Only accessories and peripherals specifically approved by MITSUBISHI
ELECTRIC may be used. Any other use or application of the products is
deemed to be improper.
Relevant safety regulations
All safety and accident prevention regulations relevant to your specific
application must be observed in the system design, installation, setup,
maintenance, servicing and testing of these products.
In this manual special warnings that are important for the proper and safe
use of the products are clearly identified as follows:
Personnel health and injury warnings.
Failure to observe the precautions described here
can result in serious health and injury hazards.
Equipment and property damage warnings.
Failure to observe the precautions described here
can result in serious damage to the equipment or
The following manuals contain further information about the modules:
Series User´s Manual – Hardware Edition, manual
Series User´s Manual – Analog Control Edition, manual
Series Programming Manual, manual No. JY997D16601
These manuals are available free of charge through the internet
If you have any questions concerning the programming and operation of
the equipment described in this manual, please contact your relevant sales
office or department.
External Dimensions and Part Names
The view on the left shows a analog
input/output module with front cover removed.
Weight: approx. 0.2 kg (0.44 lbs)
All dimensions are in "mm".
POWER LED (green):
Lit when 5 V DC is supplied from the PLC.
Direct mounting hole:
2 holes of 4.5 mm diameter (mounting screw: M4 screw)
DIN rail mounting groove (DIN rail: DIN46277)
DIN rail mounting hook
24 V LED (red):
Lit when 24 V DC power is supplied properly to the terminals
"24+" and "24-".
A/D LED (red):
Flashes during A/D conversion
D/A LED (red):
Flashes during D/A conversion
Terminal block for power supply (24 V DC)
Terminal block for analog input
(FX3U-4AD) or analog output (FX3U-4DA)
The modules of the MELSEC FX
series comply with the EC Directive
(EMC Directive) and UL standards (UL, cUL)
Installation and Wiring
Cut off all phases of the power source externally before starting
the installation or wiring work, thus avoiding electric shock or
damages to the product.
b Use the product in the environment within the general specifi-
cations described in the Hardware manual. Never use the prod-
uct in areas with dust, oily smoke, conductive dusts, corrosive
or flammable gas, vibrations or impacts, or expose it to high
temperature, condensation, or wind and rain.
If the product is used in such a place described above, electri-
cal shock, fire, malfunction, damage, or deterioration may be
b When drilling screw holes or wiring, cutting chips or wire chips
should not enter ventilation slits. Such an accident may cause
fire, failure or malfunction.
b Be sure to remove the dust proof sheet from the PLC's ventila-
tion port when the installation work is completed. Failure to do
so could can cause fires, equipment failure, and malfunctions.
b Do not touch the conductive parts of the product directly.
b Install the product securely using the DIN rail or screws.
b Install the product on a flat surface to prevend twisting.
b Fix the extension cable securely to the specified connector.
Contact failures may cause malfunction.
A special function module of the MELSEC FX
series can be used in com-
bination with a base unit of the FX
series only. It can be mounted on the
right side of either a PLC base unit, extension unit or an other special func-
tion module. Up to eight special function modules can be used in one PLC
of the FX
For further information of installation arrangements, please refer to the
Hardware Manual of the FX
The special function moduless FX
-4AD and FX
-4DA can be mounted
in two different ways:
Direct mounting e.g. in a switch cabinet
DIN rail mounting
The special function modules can be mounted with M4 screws by using the
two direct mounting holes. The mounting hole pitch is 80 mm. An interval
space between each unit of 1 to 2 mm is necessary. For further information
of direct mounting, also refer to the Hardware Manual of the FX
DIN Rail Mounting
The special function modules can also be mounted on a DIN rail
(DIN46227, 35 mm width).
Fit the upper edge of the DIN rail
mounting groove (Right fig. „A")
onto the DIN rail.
Press the special function module
against the DIN rail.
Connect the extension cable
(Right fig. „B") to the base unit,
input/output extension unit or spe-
cial function module. For details of
the extension cable connection,
refer to the Hardware Manual of
b Do not lay signal cables close to the main circuit, high-voltage
power lines, or load lines. Otherwise effects of noise or surge
induction are likely to take place. Keep a safe distance of more
than 100 mm from the above when wiring.
b Ground the shield wire or shield of a shielded cable at one
point on the PLC. However, do not ground at the same point as
high voltage lines.
Applicable Cables and Terminal Tightening Torque
Use a 2-core twisted shield cable for analog signals and separate it from
power lines or inductive lines (e.g. for servo motors).
Use commercially available terminal ends for M3 screws for connection of
the power supply and the analog signals.
max. 6,2 mm
for M3 ( 3, 2 mm)
max. 6,2 mm
Tighten the terminal screws to a torque of 0.5 to 0.8 Nm.
The grounding resistance should be 100
The grounding point should be close to the PLC. Keep the grounding
wires as short as possible.
Independent grounding should be performed for best results. When
independent grounding is not performed, perform "shared ground-
ing" of the following figure
The ground wire size should be at least 2 mm
Mitsubishi Electric Europe B.V. /// FA - European Business Group ///
Germany /// Tel.: +49(0)2102-4860 /// Fax: +49(0)2102-486112 ///