Mitsubishi FX3U Series User manual

FX3U SERIES PROGRAMMABLE
CONTROLLERS
HARDWARE MANUAL
This manual describes the part names, dimensions, mounting,
cabling and specifications for the product. This manual is extracted
from FX3U Series User's Manual - Hardware Edition. Refer to FX3U
Series User's Manual - Hardware Edition for more details. Before
use, read this manual and manuals of relevant products fully to
acquire proficiency in the handling and operating the product. Make
sure to learn all the product information, safety information, and
precautions.
And, store this manual in a safe place so that you can take it out and
read it whenever necessary. Always forward it to the end user.
Registration
The company name and the product name to be described in this
manual are the registered trademarks or trademarks of each
company.
Effective May 2005
Specifications are subject to change without notice.
 2005 Mitsubishi Electric Corporation
Safety Precaution(Read these precautions before use.)
This manual classifies the safety precautions into two categories:
and .
Depending on circumstances, procedures indicated by
may also be linked to serious results.
In any case, it is important to follow the directions for usage
.
Manual Number JY997D18801
Revision B
Date June 2005
Indicates that incorrect handling may cause
hazardous conditions, resulting in death or
severe injury.
Indicates that incorrect handling may cause
hazardous conditions, resulting in medium or
slight personal injury or physical damage.
STARTUP AND
MAINTENANCE
PRECAUTIONS
•Do not touch any terminal while the PLC’s power is on.
Doing so may cause electrical shock or malfunctions.
•Before cleaning or retightening terminals, externally cut off all
phases of the power supply.
Failure to do so may expose you to shock hazard.
•Correctly connect the battery for memory backup.
Do not charge, disassemble, heat or short-circuit the battery.
Do not throw it into the fire.
Doing so may rupture or ignite it.
•Before modifying the program under operation or performing
operation for forcible output, running or stopping, carefully read
the manual, and sufficiently ensure the safety.
An operation error may damage the machine or cause
accidents.
STARTUP AND
MAINTENANCE
PRECAUTIONS
•Before attaching or detaching the memory cassette, turn off
power. If it is attached or detached while PLC’s power is on,
the data in the memory may be destroyed, or the memory
cassette may be damaged.
•Do not disassemble or modify the PLC.
Doing so may cause failures, malfunctions or fire.
* For repair, contact your local Mitsubishi Electric distributor.
•Before connecting or disconnecting any extension cable, turn
off power.
Failure to do so may cause unit failure or malfunctions.
•Before attaching or detaching the following devices, turn off
power.
Failure to do so may cause device failure or malfunctions.
- Peripheral devices, display module and expansion boards
- Extension blocks, connector conversion adapter and special
adapters
- Battery and memory cassette
DISPOSAL
PRECAUTIONS
•Please contact a company certified in the disposal of electronic
waste for environmentally safe recycling and disposal of your
device.
TRANSPORT AND
STORAGE
PRECAUTIONS
•Before transporting the PLC, turn on power to the PLC to check
that the BATT LED lamp is off and check the battery life.
If the PLC is transported with the BATT LED lamp on or the
battery exhausted, the backed up data may be unstable during
transportation.
•During transportation, avoid impact larger than that is specified
in section 2.1 as the unit is a precision instrument.
After transportation, check the operations of the unit.
Certification of UL, cUL standards
FX3U main units and input/output extension units/blocks supporting
UL, cUL standards are as follows:
UL, cUL registration number :E95239
Models : MELSEC FX3U series manufactured
FX3U-ËËMR/ES(-A)
Where ËË indicates:16,32,48,64,80
FX3U-232ADP FX3U-485ADP
FX3U-4AD-ADP FX3U-4DA-ADP
FX3U-4AD-PT-ADP FX3U-4AD-TC-ADP
FX3U-4HSX-ADP FX3U-2HSY-ADP
Models : MELSEC FX2N series manufactured
FX2N-ËËER-ES/UL FX2N-ËËET-ESS/UL
Where ËË indicates:32,48
FX2N-16EX-ES/UL FX2N-16EYR-ES/UL
FX2N-16EYT-ESS/UL FX2N-48ER-UA1/UL
Compliance with EC directive(CE Marking)
This note does not guarantee that an entire mechanical module
produced in accordance with the contents of this note will comply
with the following standards.
Compliance to EMC directive and LVD directive of the entire
mechanical module should be checked by the user / manufacturer.
For more details please contact the local Mitsubishi Electric sales
site.
Requirement for Compliance with EMC directive
The following products have shown compliance through direct
testing (of the identified standards below) and design analysis
(through the creation of a technical construction file) to the European
Directive for Electromagnetic Compatibility (89/336/EEC) when used
as directed by the appropriate documentation.
Type : Programmable Controller (Open Type Equipment)
Models : MELSEC FX3U series manufactured
from May 1st, 2005 FX3U-ËËMR/ES(-A)
Where ËË indicates:16,32,48,64,80
FX3U-4HSX-ADP FX3U-2HSY-ADP
FX3U-FLROM-16 FX3U-FLROM-64L
FX3U-7DM
from June 1st, 2005 FX3U-232ADP FX3U-485ADP
FX3U-4AD-ADP FX3U-4DA-ADP
FX3U-4AD-PT-ADP FX3U-232-BD
FX3U-422-BD FX3U-485-BD
FX3U-USB-BD
FX3U-FLROM-64
Models : MELSEC FX2N series manufactured
from July 1st, 1997 FX2N-ËËER-ES/UL FX2N-ËËET-ESS/UL
Where ËË indicates:32,48
FX2N-16EX-ES/UL FX2N-16EYR-ES/UL
FX2N-16EYT-ESS/UL
from August 1st, 1998 FX2N-48ER-UA1/UL
to March 31st, 2002 [compliance with EN50081-2 (EN61000-6-4)
and EN50082-2]
from April 1st 2002: Above mentioned products [compliance with
EN50081-2 (EN61000-6-4) and EN61131-2]
Standard Remark
EN61131-2:2003
Programmable controllers
-Equipment
requirements and tests
Compliance with all relevant aspects
of the standard.
•Radiated Emissions
•Mains Terminal Voltage Emissions
•RF immunity
•Fast Transients
•ESD
•Conducted
•Surge
•Power magnetic fields
Standard Remark
EN50081-2:1993
Electromagnetic
compatibility
EN61000-6-4:2001
- Generic emission
standard
Industrial environment
Compliance with all relevant aspects
of the standard.
•Radiated Emissions
•Mains Terminal Voltage Emissions
EN50082-2:1995
Electromagnetic
compatibility
- Generic immunity
standard
Industrial environment
Compliance with all relevant aspects
of the standard.
•RF immunity
•Fast Transients
•ESD
•Conducted
•Power magnetic fields
EN61131-2:1994
/A11:1996
/A12:2000
Programmable controllers
- Equipment
requirements and tests
Compliance with all relevant aspects
of the standard.
•RF Immunity
•Fast Transients
•ESD
•Damped oscillatory wave
JY997D18801B(ENGLISH)

Requirement for Compliance with LVD directive
The following products have shown compliance through direct
testing (of the identified standards below) and design analysis
(through the creation of a technical construction file) to the European
Directive for Low Voltage (73/23/EEC) when used as directed by the
appropriate documentation.
Type : Programmable Controller (Open Type Equipment)
Models : MELSEC FX3U series manufactured
from May 1st, 2005 FX3U-ËËMR/ES(-A)
Where ËË indicates:16,32,48,64,80
Models : MELSEC FX2N series manufactured
from July 1st, 1997 FX2N-ËËER-ES/UL FX2N-ËËET-ESS/UL
Where ËË indicates:32,48
FX2N-16EYR-ES/UL
from August 1st, 1998 FX2N-48ER-UA1/UL
to March 31st,2002 (compliance with IEC1010-1)
from April 1st 2002: Above mentioned products
(compliance with EN61131-2)
Caution for compliance with EC Directive
Installation in Enclosure
Please use FX3U PLCs while installed in a shielded enclosure. PLCs
are open type equipment should be installed in enclosures when
used. This is not only for safety but for the shielding of noise. The
effect of noise-shielding by enclosures is important.
Caution for Analog Products in use
The analog special adapters(FX3U-4AD-ADP, FX3U-4DA-ADP,
FX3U-4AD-PT-ADP, FX3U-4AD-TC-ADP) have been found to be
compliant to the European standards in the aforesaid manual and
directive. However, for the very best performance from what are in
fact delicate measuring and controlled output device Mitsubishi
Electric would like to make the following points;
As analog devices are sensitive by nature, their use should be
considered carefully. For users of proprietary cables (integral with
sensors or actuators), these users should follow those
manufacturers installation requirements.
Mitsubishi Electric recommend that shielded cables should be used.
If NO other EMC protection is provided, then users may experience
temporary induced errors not exceeding +10%/-10% in very heavy
industrial areas.
However, Mitsubishi Electric suggest that if adequate EMC
precautions are followed with general good EMC practice for the
users complete control system, users should expect normal errors
as specified in this manual.
- Sensitive analog cable should not be laid in the same trunking
or cable conduit as high voltage cabling. Where possible users
should run analog cables separately.
- Good cable shielding should be used. When terminating the
shield at Earth - ensure that no earth loops are accidentally
created.
- When reading analog values, EMC induced errors can be
smoothed out by averaging the readings. This can be achieved
either through functions on the analog special adapters or
through a users program in the FX3U Series PLC main unit.
Standard Remark
EN61131-2:2003
Programmable controllers
- Equipment
requirements and tests
The equipment has been assessed
as a component for fitting in a
suitable enclosure which meets the
requirements of EN61131-2:2003
Standard Remark
IEC1010-1:1990
/A1:1992
Safety requirements for
electrical equipment for
measurement, control, and
laboratory use
- General requirements
The equipment has been assessed
as a component for fitting in a
suitable enclosure which meets the
requirements of IEC 1010-1:
1990+A1:1992
EN61131-2:1994
/A12:2000
/A11:1996
Programmable controllers
- Equipment
requirements and tests
The equipment has been assessed
as a component for fitting in a
suitable enclosure which meets the
requirements of EN61131-2:
1994+A11:1996+A12:2000
Associated manuals
Associated manuals
FX3U Series PLC (main unit) comes with this document (hardware
manual).
For a detailed explanation of the FX3U Series hardware and
information on instructions for PLC programming and special
extension unit/block, refer to the relevant documents.
How to obtain manuals
For the necessary product manuals or documents, consult with the
Mitsubishi Electric dealer from where you purchase your product.
Incorporated Items
Check if the following product and items are included in the package:
1. Outline
1.1 Part names
With terminal cover open
Manual name Manual No. Description
FX3U Series
User's Manual
- Hardware
Edition
JY997D16501
MODEL CODE:
09R516
Explains FX3U Series PLC
specification details for I/O,
wiring, installation, and
maintenance.
FX3U/FX3UC
Series
Programming
Manual
- Basic & Applied
Instruction Edition
JY997D16601
MODEL CODE:
09R517
Describes PLC
programming for basic/
applied instructions STL/
SFC programming and
devices.
FX Series User’s
Manual - Data
Communication
Edition
JY997D16901
MODEL CODE:
09R715
Explains N:N link, parallel
link, computer link, no
protocol communication by
RS instructions/FX2N-
232IF.
FX3U / FX3UC
Series
User's Manual
- Analog Control
Edition
JY997D16701
MODEL CODE:
09R619
Describes specifications for
analog control and
programming methods for
FX3U / FX3UC Series PLC.
FX3U / FX3UC
Series
User's Manual
- Positioning
Control Edition
JY997D16801
MODEL CODE:
09R620
Explains the specifications
for positioning control of
FX3U / FX3UC Series and
programming procedures
Product Manual Dust Proof sheet
(1 sheet)
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
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10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
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Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
This
manual
No. Name
[1] Top cover
[2] Battery cover
[3] Special adapter connecting hooks (2 places)
[4] Expansion board dummy cover
[5] RUN/STOP switch
[6] Peripheral device connecting connector
[7] DIN rail mounting hooks
[8] Model name (abbreviation)
[9] Input display LEDs (Red)
[10] Terminal block covers
[11] Extension device connecting connector cover
[12]
Operation status display LEDs
POWER Green On while power is on the PLC.
RUN Green On while the PLC is running.
BATT Red Lights when the battery voltage drops.
ERROR Red Flashing when a program error occurs.
Red Lights when a CPU error occurs.
[13] Output display LEDs (Red)
No. Name
[1] Protective terminal covers (FX3U-M/-A is excluded)
[2] Power supply, Input (X) terminals
[3] Terminal block mounting screws
(FX3U-16Mcannot be installed/removed)
[4] Terminal names
[5] Output (Y) terminals
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
[1]
[2]
[3]
[9]
[10]
[11]
[12]
[13]
[8]
[4]
[5]
[6]
[7]
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625 27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
[2]
[5]
[3]
[3]
[1]
[4]

1.2 External dimensions and weight
2. Installation (general specifications)
As for installation of the input/output extension blocks, special
adapters and expansion boards, refer to FX3U Series User's Manual
- Hardware Edition.
2.1 General specifications [Main unit]
Model name W:
mm (inches)
W1:
mm (inches)
Direct mounting
hole pitches
MASS
(Weight)
:
kg (lbs)
FX3U-16M130 (5.12”) 103 (4.06”) 0.6 (1.32lbs)
FX3U-32M150 (5.91”) 123 (4.85”) 0.65 (1.43lbs)
FX3U-48M182 (7.17”) 155 (6.11”) 0.85 (1.87lbs)
FX3U-64M220 (8.67”) 193 (7.6”) 1.00 (2.2lbs)
FX3U-80M285 (11.23”) 258 (10.16”) 1.20 (2.64lbs)
Installation
•35-mm-wide DIN rail or Direct (screw) mounting (M4)
INSTALLATION
PRECAUTIONS
•Use the product in the environment within the general
specifications described in section 2.1 of this manual.
Never use the product in areas with dust, oily smoke,
conductive dusts, corrosive gas (salt air, Cl2, H2S, SO2or NO2),
flammable gas, vibration or impacts, or expose it to high
temperature, condensation, or wind and rain.
If the product is used in such a place described, electrical
shock, fire, malfunctions, damage, or deterioration may be
caused.
•Do not touch the conductive parts of the product directly, thus
avoiding failure or malfunctions.
•Install the product securely using the DIN rail or screws.
•Install the product on a flat surface.
If the mounting surface is rough, undue force will be applied to
the PC board, thereby causing nonconformities.
•When drilling screw holes or wiring, cutting chips or wire chips
should not enter ventilation slits. such an accident may cause
fire, failures or malfunctions.
• Be sure to remove the dust proof sheet from the PLC's
ventilation port when the installation work is completed. Failure
to do so could cause fires, equipment failures, and malfunctions.
FX 3U -48MR/ES
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48MFX 3U
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
W
W1
22
(0.87")
Unit:mm(inches)
90(3.55")
80(3.15")
86(3.39")
2- 4.5-diam mounting holes (FX
3U -16M , FX 3U -32M )
4- 4.5-diam mounting holes (FX
3U -48M , FX 3U -64M ,FX 3U -80M )
FX
3U -16M and FX 3U -32M do not have the (*)-marked mounting holes.
9(0.36")
Mounting hole pitches
*
*
•Fit the extension cables, peripheral device connecting cables,
input/output cables and battery connecting cable securely to
the designated connectors.
Contact failures may cause malfunctions.
•Before attaching or detaching the following devices, turn off
power.
Failure to do so may cause device failures or malfunctions.
- Peripheral devices, display module and expansion boards
- Extension units/blocks and special adapters
- Battery and memory cassette
Notes
•When a dust proof sheet is supplied with an extension unit/
block, keep the sheet applied to the ventilation slits during
installation and wiring work.
•To prevent temperature rise, do not install the PLC on a floor, a
ceiling or a vertical surface.
Install it horizontally on a wall as shown in section 2.2.
•Keep a space of 50 mm (1.97”) or more between the unit main
body and another device or structure (part A). Install the unit as
far away as possible from high-voltage lines, high-voltage
devices and power equipment.
WIRING
PRECAUTIONS
•Cut off all phases of the power source externally before
installation or wiring work in order to avoid electric shock or
damage of product.
Item Specification
Ambient
temperature
0 to 55°C (32 to 131°F) when operating and -25 to
75°C (-13 to 167°F) when stored
Ambient
humidity 5 to 95%RH (no condensation) when operating
Vibration
resistance
Conforms to EN 68-2-6
Fre-
quency
(Hz)
Accele-
ration
(m/s2)
Half
amplitude
(mm) Sweep Count
for X, Y, Z: 10
times
(80 min in
each direction)
When
installed
on DIN
rail
10 to 57 - 0.035
57 to 150 4.9 -
When
installed
directly
10 to 57 - 0.075
57 to 150 9.8 -
Shock
resistance
Conforms to EN 68-2-27
(147 m/s2Acceleration, Action time: 11ms,
3 times in each direction X, Y, and Z)
Noise
resistance
By noise simulator at noise voltage of 1,000 Vp-p,
noise width of 1 µs, rise time of 1 ns and period of 30
to 100 Hz
Dielectric
withstand
voltage*1
1.5kV AC for one
minute Conforming to JEM-1021
Between terminals*1 and ground
terminal
500V AC for one
minute
Insulation
resistance*1
5MΩor more by
500V DC megger
INSTALLATION
PRECAUTIONS
*1
For dielectric with stand voltage test and insulation resistance
test of each product, refer to the following manual.
→Refer to FX3U Series User's Manual - Hardware Edition.
*2 For common grounding, refer to section 3.3.
*3 The PLC cannot be used at a pressure higher than the
atmospheric pressure to avoid damage.
2.2 Installation location
Install the PLC in an environment conforming to the general
specifications (section 2.1), installation precautions and notes.
For more details, refer to FX 3U Series User's Manual - Hardware
Edition.
Installation location in enclosure
Space in enclosure
2.2.1 Affixing The Dust Proof Sheet
The dust proof sheet should be affixed to the ventilation port before
beginning the installation and wiring work.
→For the affixing procedure, see the instructions on the dust
proof sheet.
Be sure to remove the dust proof sheet when the installation
and wiring work is completed.
2.3 Procedures for installing to and detaching from
DIN rail
The main unit can be installed on a DIN46277 rail [35 mm (1.38”)
wide].
2.3.1 Installation
1) Connect the expansion boards and special adapters to the main
unit.
2) Push out all DIN rail mounting
hooks (right fig.A)
3) Fit the upper edge of the DIN rail
mounting groove (right fig.C)
onto the DIN rail.
Grounding
Class D grounding (grounding resistance: 100 Ωor
less) <Common grounding with a heavy electrical
system is not allowed.>*2
Working
atmosphere
Free from corrosive or flammable gas and excessive
conductive dusts
Working
altitude Conforms to IEC61131-2 (<2000m)*3
Terminal Dielectric
strength
Insulation
resistance
Between power supply
terminal and ground
terminal
1.5 kV AC for
one minute
5MΩor more by
500V DC megger
Between input terminal
(24 VDC) and ground
terminal
500 V AC for one
minute
Between output terminal
(relay) and ground
terminal
1.5 kV AC for
one minute
Item Specification
FX 3U -48MFX 3U -48M
FX 3U Series
main unit
FX
2N
-16EX
FX
2N
-16EYT
A
A A
A
Configuration without extension cable
A = 50 mm (1.97") or more
Other device
Other
device
A
A
A
Input/output
extension unit A
Extension cable
- FX
0N -65EC
- FX
0N -30EC
Other
device
A
FX
2N
-16EYR
-ES/UL
A = 50 mm (1.97") or more
FX 3U Series
main unit
FX
2N
-16EX
FX
2N
-16EYT
FX
2N
-16EX
FX
2N
-10PG
A
FX
2N
-8AD
FX
2N
-4AD
Configuration in 2 stages with extension cable
A
FX
2N
-CNV-BC
FX
3U
-4AD
-ADP
A2)2)
2)
A
2)
C
C
RUN
STOP
FX
FX
3U
3U
-48MR/ES
-48MR/ES
FX
FX
3U
3U
-48M
-48M
FX
3U
-48M
ERROR
RUN
BATT
POWER
03
12
IN
6
45
21
7
2024
22232625
101113
1216
141517
27
OUT
03
126
45
21
7
2024
222326
25
101113
1216
141517
27

4) Lock the DIN rail mounting hooks (below fig.B) while pressing the
PLC against the DIN rail.
2.4 Procedures for installing directly (with M4
screws)
The product can be installed directly on the panel (with screws).
2.4.1 Mounting hole pitches
Refer to the External Dimensions (section 1.2) for the product's
mounting hole pitch information.
As for the details of the mounting hole pitches for extension unit/
block and special adapters, refer to the following manual.
→Refer to FX3U Series User's Manual - Hardware Edition.
2.4.2 Installation
1) Make mounting holes in the
mounting surface referring to
the external dimensions
diagram.
2) Fit the main unit (A in the right
figure) based on the holes, and
secure it with M4 screws (B in
the right figure).
The mounting hole pitches and
number of screws depend on
the product. See the external
dimensions diagram.
3. Power supply/input/output specifications
and examples of external wiring
As for the details of the power supply wiring and input/output wiring,
refer to FX3U Series User's Manual - Hardware Edition.
DESIGN
PRECAUTIONS
•Provide a safety circuit on the outside of the PLC so that the
whole system operates to ensure the safety even when external
power supply trouble or PLC failure occurs.
Otherwise, malfunctions or output failures may result in an
accident.
1) An emergency stop circuit, a protection circuit, an interlock
circuit for opposite movements, such as normal and
reverse rotations, and an interlock circuit for preventing
damage to the machine at the upper and lower positioning
limits should be configured on the outside of the PLC.
2) When the PLC CPU detects an error, such as a watch dog
timer error, during self-diagnosis, all outputs are turned off.
When an error that cannot be detected by the PLC CPU
occurs in an input/output control block, output control may
be disabled.
Design external circuits and mechanisms to ensure safe
operations of the machine in such a case.
FX 3U -48M
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48M
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 24
22 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX
FX
3U
3U
-48M
-48M
ERROR
RUN
BATT
BATT
POWER
R
0 31 2
IN
OUT
64 5 21
21
7 20
20
24
24
22
22
23
23
26
26
25
25
10
10
11
11
13
13
12
12
16
16
14
14
15
15
17
17
27
27
0 31 2 64 5 21
21
7 20
20
24
24
22
22
23
23
26
26
25
25
10
10
11
11
13
13
12
12
16
16
14
14
15
15
17
17
27
27
Y12
Y12
Y10
Y10
Y16
Y16
Y14
Y14
Y22
Y22
Y20
Y20
Y26
Y26
COM5
COM5
COM1
COM1
Y24
Y24
Y6
Y6
Y4
Y4
Y2
Y2
Y0
Y0
Y7
Y7
Y11
Y11
Y13
Y13
Y5
Y5
COM2
COM2
Y3
Y3
Y1
Y1
COM3
COM3
Y15
Y15
Y17
Y17
COM4
COM4
Y23
Y23
Y25
Y25
Y27
Y27
Y21
Y21
X5
X5
X0
X0
X1
X1
X2
X2
X3
X3
X7
X7
X11
X11
X13
X13
X4
X4
0V
0V
S/S
S/S
N24V
24V
X6
X6
X10
X10
X12
X12
X14
X14
X16
X16
X20
X20
LX27
X27
X23
X23
X25
X25
X15
X15
X17
X17
X21
X21
X24
X24
X26
X26
X22
X22
FX
FX
3U
3U
-48M
-48M
ERROR
RUN
BATT
BATT
POWER
R
0 31 2
IN
OUT
64 5 21
21
7 20
20
24
24
22
22
23
23
26
26
25
25
10
10
11
11
13
13
12
12
16
16
14
14
15
15
17
17
27
27
0 31 2 64 5 21
21
7 20
20
24
24
22
22
23
23
26
26
25
25
10
10
11
11
13
13
12
12
16
16
14
14
15
15
17
17
27
27
Y12
Y12
Y10
Y10
Y16
Y16
Y14
Y14
Y22
Y22
Y20
Y20
Y26
Y26
COM5
COM5
COM1
COM1
Y24
Y24
Y6
Y6
Y4
Y4
Y2
Y2
Y0
Y0
Y7
Y7
Y11
Y11
Y13
Y13
Y5
Y5
COM2
COM2
Y3
Y3
Y1
Y1
COM3
COM3
Y15
Y15
Y17
Y17
COM4
COM4
Y23
Y23
Y25
Y25
Y27
Y27
Y21
Y21
X5
X5
X0
X0
X1
X1
X2
X2
X3
X3
X7
X7
X11
X11
X13
X13
X4
X4
0V
0V
S/S
S/S
N24V
24V
X6
X6
X10
X10
X12
X12
X14
X14
X16
X16
X20
X20
LX27
X27
X23
X23
X25
X25
X15
X15
X17
X17
X21
X21
X24
X24
X26
X26
X22
X22
FX 3U -48M
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
FX 3U -48M
ERROR
RUN
BATT
POWER
R
0312
IN
OUT
645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
0312 645 21 7 20 2422 23 2625
10 11 1312 1614 15 17
27
Y12Y10 Y16Y14 Y22Y20 Y26 COM5
COM1
Y24Y6
Y4Y2Y0
Y7 Y11 Y13Y5
COM2
Y3
Y1 COM3 Y15 Y17COM4 Y23 Y25 Y27Y21
X5
X0
X1
X2
X3 X7 X11 X13
X40VS/S
N 24V
X6 X10 X12 X14 X16 X20
LX27X23 X25X15 X17 X21
X24 X26X22
D4) D4)
FX
3U
-48M
FX
3U
RUN
POWER
ERROR
BATT
FX
3U
-48M
FX
3U
ERROR
RUN
BATT
POWER
03
12
IN
OUT
6
45
21
7
2024
222326
25
101113
1216
141
51
7
27
03
126
45
21
7
2024
222326
25
101113
1216
141517
27
B
A
B
3) When some sort of error occurs in a relay, triac or transistor
of the output unit/block, output may be kept on or off.
For output signals that may lead to serious accidents,
design external circuits and mechanisms to ensure safe
operations of the machine in such cases.
DESIGN
PRECAUTIONS
•Do not bundle the control line together with the main circuit or
power line. Do not lay the control line near them.As a rule, lay
the control line at least 100mm(3.94") or more away from the
main circuit or power line.
Noise may cause malfunctions.
•Install in a manner which prevents excessive force from being
applied to the connectors for peripheral device connections.
Failure to do so may result in wire breakage or failure of the
PLC.
Notes
•Simultaneously turn on and off the power supplies of the main
unit and extension devices.
•Even if the power supply causes an instantaneous power failure
for less than 10 ms, the PLC can continue to operate.
•If a long-time power failure or an abnormal voltage drop occurs,
the PLC stops, and output is turned off. When the power
supply is restored, it will automatically restart (when the RUN
input is on).
WIRING
PRECAUTIONS
•Cut off all phases of the power source externally before
installation or wiring work in order to avoid electric shock or
damage of product.
WIRING
PRECAUTIONS
•Connect the AC power supply wiring to the power supply
terminal as stated in this manual.
If an AC power supply is connected to a DC input/output
terminal (connector) or power supply terminal, the PLC will be
burnt out.
•Do not wire vacant terminals externally.
Doing so may damage the product.
•The main unit requires a class D ground (grounding resistance:
100Ωor less), with a 2mm2or larger wire used at the ground
terminal.
Do not connect the terminal to a ground wire common to a
heavy electrical system (refer to section 3.3).
•When drilling screw holes or wiring, cutting chips or wire chips
should not enter ventilation slits. such an accident may cause
fire, failures or malfunctions.
Notes
•Input/output wiring 50 to 100 m (164’1” to 328’1”) long will
cause almost no problems of noise, but, generally, the wiring
length should be less than 20 m (65’7”) to ensure the safety.
•Extension cables are easily affected by noise. Lay the cables
at a distance of at least 30 to 50 mm (1.19” to 1.97”) away from
the PLC output and other power lines.
DESIGN
PRECAUTIONS
3.1 Cable end treatment and tightening torque
For the terminals of FX3U series PLC, M3 screws are used.
The electric wire ends should be treated as shown below.
Tighten the screws to a torque of 0.5 N.m to 0.8 N.m.
•When one wire is connected to one terminal
•When two wires are connected to one terminal
3.2 Power supply specifications and example of
external wiring
→Refer to FX3U Series User's Manual - Hardware Edition.
3.2.1 Power supply specifications
The specifications for the power supply of the main unit are
shown in the following table.
*1 Does not include the power consumption of extension units /
special extension units, and of the extension blocks / special
extension blocks connected to those units.
For the power (current) consumed by the extension units/
blocks for input/output, refer to FX3U Series User's Manual -
Hardware Edition.
For the power consumed by the special extension blocks/
units, refer to refer to the appropriate manual.
*2 When input/output extension blocks are connected, the 24V
DC service power supply is consumed by the blocks, and
the current value to be used by the main unit is reduced.
*3 Cannot be used to supply power to an external destination.
The power is supplied to input/output extension blocks,
special extension blocks, special adapters and expansion
boards.
3.2.2 Example of external wiring (power supply)
100 to 240 V AC power is supplied to the main unit. For the details
of wiring work, refer to section 3.1.
3.3 Grounding
Ground the PLC as stated below.
• Perform class D grounding. (Grounding resistance: 100 Ω or less)
• Ground the PLC independently if possible.
If it cannot be grounded independently, ground it jointly as shown
below.
•Use ground wires thicker than AWG14 (2 mm2).
•Position the grounding point as close to the PLC as possible to
decrease the length of the ground wire.
Item Specification
Supply voltage 100 - 240V AC (+10%,-15%)
Allowable supply voltage range 85 - 264V AC
Rated frequency 50/60Hz
Allowable instantaneous power
failure time
Operation can be continued
upon occurrence of
instantaneous power failure for
10 ms or less.
When the supply voltage is 200
V AC, the time can be changed
to 10 to 100 ms by editing the
user program.
Power
fuse
FX3U-16Mto 32M250V AC 3.15A
FX3U-48Mto 80M250V AC 5A
Rush current 30 A max. 5 ms or less/100 V AC
65 A max. 5 ms or less/200 V AC
Consumed
power*1
FX3U-16M30W
FX3U-32M35W
FX3U-48M40W
FX3U-64M45W
FX3U-80M50W
24-VDC
service
power
supply*2
FX3U-16Mto 32M400 mA or less
FX3U-48Mto 80M600 mA or less
5-VDC built-in power supply*3 500 mA or less
φ 3.2 (0.13")
6.2 mm (0.24")
or less
’[Žq
Terminal
screw Solderless
terminal
Terminal
6.2 mm (0.24")
or less
φ 3.2 (0.13")
6.3 mm(0.25")
or more
6.3 mm(0.25")
or more
Terminal
screw Solderless
terminal
Terminal
6.2 mm (0.24")
or less
6.2 mm (0.24")
or less
φ 3.2 (0.13")
φ 3.2 (0.13")
AC power supply of
100 - 240 V AC
PL
Power on Emer-
gency
stop
MC
MC
DC power
supply
Power supply for loads connected
to PLCoutput terminals
DC AC
MCMC
*
Fuse
L
N
PLC
*Class D grounding
See section 3.3 for
details.
PLC Other
device PLC Other device PLC Other device
Joint grounding
(acceptable) Common grounding (unacceptable)
Independent
grounding (best)

3.4 Input specifications and external wiring
→Refer to FX3U Series User's Manual - Hardware Edition.
Input specifications
*1 FX3U-16Mcannot be installed/removed
3.4.1 Examples of input wiring
3.4.2 Instructions for connecting input devices
1) In the case of no-voltage contact:
The input current of this PLC is 5 to 7 mA/24 VDC.
Use input devices applicable to this minute current.
If no-voltage contacts (switches) for large current are used,
contact failure may occur.
<Example> Products of OMRON
2) In the case of input device with built-in series diode:
The voltage drop of the series diode should be approx. 4 V or
less.
When lead switches with a series LED are used, up to two
switches can be connected in series.
Item Specification
Number of
input
points
FX 3U -16M  8 points
FX 3U -32M  16 points
FX 3U -48M  24 points
FX 3U -64M  32 points
FX 3U -80M  40 points
Input connecting type Removable terminal block (M3 screw)*1
Input form Sink/source
Input signal voltage 24V DC +10%, -10%
Input
impedance
X000 to
X005 3.9kΩ
X006, X007 3.3kΩ
X010 or
more
4.3kΩ
(Does not apply to FX3U-16M
 .)
Inputsignal
current
X000 to
X005 6mA/DC24V
X006, X007 7mA/DC24V
X010 or
more
5mA/DC24V
(Does not apply to FX3U-16M.)
ON input
sensitivity
current
X000 to
X005 3.5 mA or more
X006, X007 4.5 mA or more
X010 or
more
3.5 mA or more
(Does not apply to FX3U-16M
 .)
OFF input sensitivity
current 1.5 mA or less
Input response time Approx. 10 ms
Input signal form
•Sink input:
No-voltage contact input
NPN open collector transistor
•Source input:
No-voltage contact input
PNP open collector transistor
Input circuit insulation Photocoupler insulation
Input operation display LED on panel lights when photocoupler
is driven.
Type Model
name Type Model name
Microswitch Models Z, V
and D2RV
Operation
switch Model A3P
Proximity
switch Model TL Photoelectric switch Model E3S
*
100 to 240V AC
Fuse
L
N
S/S
0V
24V
X000
X001
X002
X003
3-wire type
sencer
*
100 to 240V AC
Fuse
L
N
S/S
0V
24V
X000
X001
X002
X003
3-wire type
sencer
(sink input)PLC (source input)PLC
*Class D grounding
See section 3.3 for details.
X
0V
LED
24V
S/S
(sink input)PLC
X
24V
LED
0V
S/S
(source input)PLC
3) In the case of input device with built-in parallel resistance:
Use a device having a parallel resistance, Rp, of 15 kΩ or more.
When the resistance is less than 15 kΩ, connect a bleeder
resistance, Rb, obtained from the formula as shown in the
following figure.
4) In the case of 2-wire proximity switch:
Use a two-wire proximity switch whose leakage current, , is
1.5 mA or less when the switch is off.
When the current is 1.5 mA or more, connect a bleeder
resistance, Rb, obtained from formula as shown in the following
figure.
3.5 Output specifications and example of external
wiring
→Refer to FX3U Series User's Manual - Hardware Edition.
3.5.1 Relay output specifications
*1 FX3U-16Mcannot be installed/removed
Number of output points per common terminal
•On FX3U-16M, one common terminal is used for 1 output point.
•On models other than FX3U-16M, 1 common terminal is used
for 4 or 8 output points.
3.5.2 Life of relay output contact
The standard life of the contact used for Inductive loads, such as
contactors and solenoid valves, is 500 thousand times at 20 VA.
The following table shows the approximate life of the relay based on
the results of our life test.
X
24V
0V
S/S
(source input)PLC
Rp
Rb
X
0V
24V
S/S
Rp
Rb
(sink input)PLC
15 k
Ω
or more 15 k
Ω
or more
Rb 4Rp
15-Rp (k
Ω )
I
X
24V
0V
S/S
(source input)PLC
Rb
X
0V
24V
S/S
Rb
(sink input)PLC
2-wire
proximity
sensor
2-wire
proximity
sensor
II
Rb 6
I -1.5 (k
Ω )
Item Specification
Number
of
output
points
FX3U-16MR/  8 points
FX3U-32MR/  16 points
FX3U-48MR/  24 points
FX3U-64MR/  32 points
FX3U-80MR/  40 points
Output connecting type
Removable terminal block (M3
screw) *1
Output form Relay
External power supply
30 VDC or less
240 VAC or less ("250 VAC or less"
if not a CE, UL, cUL compliant item)
Max.
load
Resistance load 2 A
/point
The total load current of
resistance loads per
common terminal should be
the following value or less.
•1 output point/common
terminal: 2 A
•4 output point/common
terminal: 8 A
•8 output point/common
terminal: 8 A
Inductive load 80VA
Min. load 5 V DC, 2 mA (reference value)
Open circuit leakage current -
Respon
se time
OFF→ON Approx. 10 ms
ON→OFF Approx. 10 ms
Circuit insulation Mechanical insulation
Display of output operation LED lights when power is applied to
relay coil.
Load capacity Contact
life
Example of applicable
loads (magnetic
switches made by us)
20VA 0.2A/100V AC 3 million
times S-K10 to S-K95
0.1A/200V AC
35VA 0.35A/100V AC 1 million
times S-K100 to S-K150
0.17A/200V AC
80VA
0.8A/100V AC 2 hundred
thousand
times
S-K180,S-K400
0.4A/200V AC

3.5.3 Example of output wiring
3.5.4 Cautions in external wiring
Protection circuit for load short-circuiting
When a load connected to the output terminal short-circuits, the
printed circuit board may be burnt out. Fit a protective fuse on the
output circuit.
Protection circuit of contact when inductive load is used
The relay output circuit does not have a protection circuit.
When an inductive load is connected, a surge-absorbing contact
protection circuit should be inserted to prolong life and reduce noise.
1) DC circuit
Connect a diode in parallel with the load.
Use a diode (for commutation) having the following
specifications.
2) AC circuit
Connect a surge absorbing element (CR composite part, i.e
surge killer and spark killer), such as a surge absorber, having
the following specifications in parallel with the load.
Reference
Mechanical interlock
Loads, such as contactors for normal and reverse rotations, that
must not be turned on simultaneously should be provided with an
interlock in the PLC program and an external interlock as shown
below.
Common mode
Use output contacts (*) of the PLC in the common mode.
Item Standard
Reverse dielectric strength Over 5 times the load voltage
Forward current Load current or more
Item Standard
Rated voltage 240V AC or less ("250 VAC or less"
if not a CE, UL, cUL compliant item)
Electrostatic capacity Approx. 0.1µF
Resistance value Approx. 100 to 200Ω
PLC
24V DC
Fuse
Y000
100V AC
COM1
Y001
Load
Fuse
Y010
COM2
Y011
Load
PLC
100V AC
Load
Fuse Y
COM
Inductive
load
PLC output
contact
Diode
(for commutation)
Manufacturer Model name
Marcon Electronics Co., Ltd. Model RFD2E104K
Okaya Electric Industries Co.,
Ltd. CR-10201
Rubycon Corporation Model 250MCRA104100M B0325
Surge absorber
PLC output
contact
Inductive
load
Interlock
PLC output
contact
Limit of
normal
rotation
Limit of
reverse
rotation
PLC output
contact
*
*
*
*
Bad
Good
4. Terminal block layouts
FX 3U -48MR/
X7X5X3X124VNL
X6X4X2X00VS/S
Y7Y5Y1
Y10Y6Y4Y2
Y3 Y11
Y12
Y13
X17X15X13X11
X16X14X12X10
COM1
Y0
COM2 COM3 COM4
Y14
Y15
Y16
Y17
X27X25X23X21
X26X24X22X20
Y20
Y21
Y22
Y23
Y24
Y25
Y26
Y27
COM5

FX 3U -32MR/
X7X5X3X124VNL
X6X4X2X00VS/S
Y7Y5Y1
Y10Y6Y4Y2
Y3 Y11
Y12
Y13
X17X15X13X11
X16X14X12X10
COM1
Y0
COM2 COM3 COM4
Y14
Y15
Y16
Y17

FX 3U -64MR/
X7X5X3X124VNL
X6X4X2X00VS/S
Y7Y5Y1
Y10Y6Y4Y2
Y3 Y11
Y12
Y13
X17X15X13X11
X16X14X12X10
COM1
Y0
COM2 COM3 COM4
Y14
Y15
Y16
Y17
X27X25X23X21
X26X24X22X20
Y20
Y21
Y22
Y23
Y24
Y25
Y26
Y27
COM6
24V
0V
X31
X30
X33
X32
X35
X34
X37
X36
Y30
Y31
Y32
Y33
Y34
Y35
Y36
Y37
COM5

FX 3U -80MR/
X7X5X3X124VNL
X6X4X2X00VS/S
Y7Y5Y1
Y10Y6Y4Y2
Y3 Y11
Y12
Y13
X17
X15X13X11
X16X14X12X10
COM1
Y0
COM2 COM3 COM4
Y14
Y15
Y16
Y17
X27X25X23X21
X26X24X22X20
Y20
Y21
Y22
Y23
Y24
Y25
Y26
24V
0V
X31
X30
X33
X32
X35
X34
X37
X36
COM5
X41
X40
X43
X42
X45
X44
X47
X46
Y27
COM7
Y30
Y31
Y32
Y33
Y34
Y35
Y36
Y37
COM6
Y40
Y41
Y42
Y43
Y44
Y45
Y46
Y47

FX 3U -16MR/
X7X5X324VNL
X6X4X2X00VS/S
Y5Y3Y2Y0 Y6Y1 Y4 Y7
Y5Y3Y2Y0 Y6Y1 Y4 Y7
X1


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.
Warranty
Mitsubishi will not be held liable for damage caused by factors found not to be
the cause of Mitsubishi; machine damage or lost profits caused by faults in the
Mitsubishi products; damage, secondary damage, accident compensation
caused by special factors unpredictable by Mitsubishi; damages to products
other than Mitsubishi products; and to other duties.
For safe use
This product has been manufactured as a general-purpose part for general
industries, and has not been designed or manufactured to be incorporated in
a device or system used in purposes related to human life.
Before using the product for special purposes such as nuclear power, electric
power, aerospace, medicine or passenger movement vehicles, consult with
Mitsubishi Electric.
This product has been manufactured under strict quality control. However,
when installing the product where major accidents or losses could occur if the
product fails, install appropriate backup or failsafe functions in the system.
•
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