Mitsubishi MELSEC Q4ARCPU User manual

Q4ARCPU
Mitsubishi Programmable Logic Controller
User's Manual
(Hardware)
Thank you for purchasing the Mitsubishi programmable logic controller
MELSEC-QnA Series.
Prior to use, please read both this and relevant manuals
thoroughly to fully understand the product.
MODEL Q4ARCPU-U(H/W)-E
MODEL
CODE 13J851
IB(NA)-66684-G(0705)MEE
©1996 MITSUBISHI ELECTRIC CORPORATION

A-1
SAFETY PRECAUTIONS 
(Be sure to read these instructions before use.)
Before using the product, read this and relevant manuals carefully and handle the
product correctly with full attention to safety.
In this manual, SAFETY PRECAUTIONS are classified into 2 levels:
"DANGER" and "CAUTION".
Indicates that incorrect handling may cause hazardous
conditions, resulting in death or severe injury.
Indicates that incorrect handling may cause hazardous
conditions, resulting in minor or moderate injury and/or
property damage.
Under some circumstances, failure to observe the CAUTION level
instructions may also lead to serious results.
Be sure to observe the instructions of both levels to ensure the safety.
Please keep this manual in a safe place for future reference and also pass this
manual on to the end user.
[DESIGN PRECAUTIONS]
DANGER
Create a safety circuit outside the PLC to ensure the whole system will
operate safely even if an external power failure or a PLC failure occurs.
Otherwise, incorrect output or malfunction may cause an accident.
(1) For an emergency stop circuit, protection circuit and interlock circuit that
is designed for incompatible actions such as forward/reverse rotation or
for damage prevention such as the upper/lower limit setting in
positioning, any of them must be created outside the PLC.
(2) When the PLC detects the following error conditions, it stops the
operation and turn off all the outputs.
The overcurrent protection device or overvoltage protection device of
the power supply module is activated.
The PLC CPU detects an error such as a watchdog timer error by the
self-diagnostics function.
In the case of an error of a part such as an I/O control part that cannot
be detected by the PLC CPU, all the outputs may turn on. In order to
make all machines operate safely in such a case, set up a fail-safe circuit
or a specific mechanism outside the PLC.
Refer to "LOADING AND INSTALLATION" in this manual for example
fail safe circuits.
DANGER
CAUTION

A-2
[DESIGN PRECAUTIONS]
DANGER
(3) Depending on the failure of the output module’s relay or transistor, the
output status may remain ON or OFF incorrectly. For output signals that
may lead to a serious accident, create an external monitoring circuit.
If load current more than the rating or overcurrent due to a short circuit
in the load has flowed in the output module for a long time, it may
cause a fire and smoke. Provide an external safety device such as a
fuse.
Design a circuit so that the external power will be supplied after
power-up of the PLC.
Activating the external power supply prior to the PLC may result in an
accident due to incorrect output or malfunction.
For the operation status of each station at a communication error in
data link, refer to the respective data link manual.
The communication error may result in an accident due to incorrect
output or malfunction.
When controlling a running PLC (data modification) by connecting a
peripheral device to the CPU module or a PC to a special function module,
create an interlock circuit on sequence programs so that the whole system
functions safely all the time.
Also, before performing any other controls (e.g. program modification,
operating status change (status control)), read the manual carefully and
ensure the safety.
In these controls, especially the one from an external device to a PLC in a
remote location, some PLC side problem may not be resolved immediately
due to failure of data communications.
To prevent this, create an interlock circuit on sequence programs and
establish corrective procedures for communication failure between the
external device and the PLC CPU.
For the redundant power supply system, use the A37RHB redundant power
supply main base unit and the A68RB redundant power supply extension
base unit.
When using an old model, A3 B, A5 B or A6 B, set the output hold/reset
setting switch on the CPU module to the output reset mode. Inadvertently
using it in the output hold mode may result in an accident due to incorrect
output and/or malfunctions.
When setting up the system, do not allow any empty slot on the base unit.
If any slot is left empty, be sure to use a blank cover (A1SG60) or a dummy
module (A1SG62) for it.
When using the extension base unit, A52B, A55B or A58B, attach the
included dustproof cover to the module in slot 0.
Otherwise, internal parts of the module may be flied in the short circuit test or
when an overcurrent or overvoltage is accidentally applied to external I/O
section.

A-3
[DESIGN PRECAUTIONS]
CAUTION
Do not install the control lines or communication cables together with the
main circuit or power lines, or bring them close to each other.
Keep a distance of 100mm (3.94inch) or more between them.
Failure to do so may cause malfunctions due to noise.
If having read register R outside the allowable range with the MOV
instruction, the file register data will be FFFFH. Using this as it is may cause
malfunctions. Pay attention not to use any out-of-range file register when
designing sequence programs. For instruction details, refer to the
programming manual.
When an output module is used to control the lamp load, heater, solenoid
valve, etc., a large current (ten times larger than the normal one) may flow at
the time that the output status changes from OFF to ON. Take some
preventive measures such as replacing the output module with the one of a
suitable current rating.
[INSTALLATION PRECAUTIONS]
CAUTION
Use the PLC under the environment specified in the user’s manual.
Otherwise, it may cause electric shocks, fires, malfunctions, product
deterioration or damage.
Hold down the module loading lever at the module bottom, and securely
insert the module fixing latch into the fixing hole in the base unit.
Incorrect loading of the module can cause a malfunction, failure or drop.
When using the PLC in the environment of much vibration, tighten the
module with a screw.
Tighten the screw in the specified torque range. Undertightening can cause a
drop, short circuit or malfunction. Overtightening can cause a drop, short
circuit or malfunction due to damage to the screw or module.
Connect the extension cable to the connector of the base unit or module.
Check the cable for incomplete connection after connecting it.
Poor electrical contact may cause incorrect inputs and/or outputs.
Insert the memory card and fully press it to the memory card connector.
Check for incomplete connection after installing it.
Poor electrical contact may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the
system before mounting or removing the module. Failure to do so may
damage the module.
Do not directly touch the conductive part or electronic components of the
module.
Doing so may cause malfunctions or a failure of the module.

A-4
[WIRING PRECAUTIONS]
DANGER
Be sure to shut off all phases of the external power supply used by the
system before wiring.
Failure to do so may result in an electric shock or damage of the product.
Before energizing and operating the system after wiring, be sure to attach the
terminal cover supplied with the product.
Failure to do so may cause an electric shock.
CAUTION
Always ground the FG and LG terminals to the protective ground conductor.
Failure to do so may cause an electric shock or malfunctions.
Wire the module correctly after confirming the rated voltage and terminal
layout.
Connecting a power supply of a different voltage rating or incorrect wiring
may cause a fire or failure.
Do not connect multiple power supply modules to one module in parallel. The
power supply modules may be heated, resulting in a fire or failure.
Press, crimp or properly solder the connector for external connection with the
specified tool.
Incomplete connection may cause a short circuit, fire or malfunctions.
Tighten terminal screws within the specified torque range. If the screw is too
loose, it may cause a short circuit, fire or malfunctions.
If too tight, it may damage the screw and/or the module, resulting in a short
circuit or malfunctions.
Carefully prevent foreign matter such as dust or wire chips from entering the
module.
Failure to do so may cause a fire, failure or malfunctions.
Install our PLC in a control panel for use.
Wire the main power supply to the power supply module installed in a control
panel through a distribution terminal block.
Furthermore, the wiring and replacement of a power supply module have to
be performed by a maintenance worker who acquainted with shock
protection.
(For the wiring methods, refer to Q4ARCPU User’s Manual.)

A-5
[STARTUP AND MAINTENANCE PRECAUTIONS]
DANGER
Do not touch any terminal during power distribution.
Doing so may cause an electric shock.
Properly connect batteries. Do not charge, disassemble, heat or throw them
into the fire and do not make them short-circuited and soldered. Incorrect
battery handling may cause personal injuries or a fire due to exothermic heat,
burst and/or ignition.
Be sure to shut off all phases of the external power supply used by the
system before cleaning or retightening the terminal screws or module
mounting screws.
Failure to do so may result in an electric shock.
If they are too loose, it may cause a short circuit or malfunctions.
If too tight, it may cause damage to the screws and/or module, resulting in an
accidental drop of the module, short circuit or malfunctions.
CAUTION
When performing online operations (especially, program modification, forced
output or operating status change) by connecting a peripheral device to the
running CPU module, read the manual carefully and ensure the safety.
Incorrect operation will cause mechanical damage or accidents.
Do not disassemble or modify each of modules.
Doing so may cause failure, malfunctions, personal injuries and/or a fire.
When using a wireless communication device such as a mobile phone, keep
a distance of 25cm (9.84inch) or more from the PLC in all directions.
Failure to do so may cause malfunctions.
Be sure to shut off all phases of the external power supply used by the
system before mounting or removing the module.
Failure to do so may result in failure or malfunctions of the module.
When replacing the fuse, use a fuse specified by the manufacturer.
Using the one for the high-rated current or an electric wire may cause a fire.
Do not drop or apply any impact to the battery.
Doing so may damage the battery, resulting in electrolyte spillage inside the
battery.
If any impact has been applied, discard the battery and never use it.
Before handling modules, touch a grounded metal object to discharge the
static electricity from the human body.
Failure to do so may cause failure or malfunctions of the module.

A-6
[DISPOSAL PRECAUTIONS]
CAUTION
When disposing of the product, treat it as an industrial waste.
[TRANSPORTATION PRECAUTIONS]
CAUTION
When transporting lithium batteries, make sure to treat them based on the
transportation regulations. (Refer to Chapter 7 for details of the relevant
models.)

A-7
REVISIONS
*The manual number is given on the bottom right of the front cover.
Print Date *Manual Number Revision
Sep., 1996 IB(NA) 66684-A First edition
Nov., 2000 IB(NA) 66684-B Addition of model
AX11EU, AX21EU, AX41-S1, AX42-S1,
AX81-S1, AX81-S3, AY11AEU, AY11EEU,
AY13EU, AY15EU, AY20EU, AY42-S1,
AY42-S2, A61PN, A62PN, A67RP
Correction
Safety precautions, Section 4.1.2, 4.5.2, 6.2
Addition
Specifications, Performance specifications,
EMC standards, Low-Voltage instruction
Jun., 2003 IB(NA) 66684-C Correction
Safety precautions, Section 6.2
Dec., 2004 IB(NA) 66684-D Correction
Safety precautions, Section 1.1, Chapter 3,
Section 3.1, 3.1.1, 3.2, 4.2, 4.4, 6.2, 6.3
Addition
Section 6.1, Chapter 7, Section 7.1, 7.2
Section changes
Sections 6.1 and 6.2 are changed to Sections
6.2 and 6.3, respectively.
Jul., 2005 IB(NA) 66684-E Correction
Safety precautions, Section 3.1.1, 3.1.2, 3.1.3,
3.1.4, 3.2, 3.2.2, 3.2.3, 3.2.4, 3.2.5, 3.2.7, 4.2,
4.3.1, 4.3.3, 4.4, 4.5.1, 4.5.2, 5.1.1, 5.1.2,
5.2.1, 6.3
Oct., 2006 IB(NA) 66684-F Correction
Safety precautions, Section 1.1, 3.1.3, 3.2.4,
3.2.6, 4.3.1, 4.3.2, 4.3.3, 4.3.4, 6.3

A-8
Print Date *Manual Number Revision
May, 2007 IB(NA) 66684-G Partial Correction
Section 3.1, 3.1.1, 3.1.2, 3.1.3, 3.1.4, 3.1.6,
3.2.5, 3.2.7, 4.3.3, 4.3.4, 4.4, 6.3
Japanese Manual Version IB(NA)68613-G
This manual confers no industrial property rights or any rights of any other kind,
nor dose 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.
©1996 Mitsubishi Electric Cor
p
oration

A-9
CONTENTS
1. SPECIFICATIONS........................................................................................ 1
1.1 SPECIFICATIONS ................................................................................... 1
2. PERFORMANCE SPECIFICATIONS .......................................................... 2
2.1 Q4ARCPU Module Performance Specifications ...................................... 2
3. EMC AND LOW VOLTAGE DIRECTIVES................................................... 3
3.1 Requirements for Compliance with EMC Directive................................... 3
3.1.1 EMC Directive standards ................................................................... 3
3.1.2 Installation to the control panel .......................................................... 4
3.1.3 Cables................................................................................................ 7
3.1.4 Power supply module ...................................................................... 12
3.1.5 Base unit.......................................................................................... 12
3.1.6 Ferrite core ...................................................................................... 12
3.1.7 Noise filter (power supply line filter) ................................................. 13
3.2 Requirements for Compliance with Low Voltage Directive ..................... 14
3.2.1 Standards relevant to redundant power supply system (Q4ARCPU)
and redundant system ..................................................................... 14
3.2.2 Guidelines for use of redundant power supply system (Q4ARCPU)
and redundant system ..................................................................... 14
3.2.3 Power supply ................................................................................... 15
3.2.4 Control panel ................................................................................... 16
3.2.5 Module installation ........................................................................... 17
3.2.6 Grounding ........................................................................................ 17
3.2.7 External wiring ................................................................................. 17
4. LOADING AND INSTALLATION ............................................................... 18
4.1 Installing modules................................................................................... 18
4.1.1 Precautions for handling of modules ............................................... 18
4.1.2 Installation environment................................................................... 18
4.1.3 Precautions relating to the installation of the unit ............................ 19
4.2 Fail-Safe Circuit Concept........................................................................ 22
4.3 Power supply connection........................................................................ 29
4.3.1 Performance Specifications for Power Supply Modules .................. 29
4.3.2 Part names and settings of Power Supply Module .......................... 34
4.3.3 Wiring instructions ........................................................................... 41
4.3.4 Wiring to module terminals .............................................................. 45
4.4 Precaution when Connecting the Uninterruptive Power Supply (UPS) .. 50
4.5 Part names and Settings ........................................................................ 51
4.5.1 Part names and settings .................................................................. 51
4.5.2 Relationship between switch operation and LEDs and LED displays
......................................................................................................... 54

A-10
5. I/O MODULE SPECIFICATIONS AND CONNECTIONS........................... 59
5.1 Input Modules......................................................................................... 59
5.1.1 Input module specifications ............................................................. 59
5.1.2 Input module connections................................................................ 63
5.2 Output Modules ...................................................................................... 69
5.2.1 Output module specifications........................................................... 69
5.2.2 Output module connections ............................................................. 75
5.3 Input/Output Combined Modules............................................................ 83
5.3.1 Input/output combined module specifications.................................. 83
5.3.2 Input/output combined module connections .................................... 85
6. ERROR CODE ........................................................................................... 89
6.1 Error Code Type ..................................................................................... 89
6.2 Reading Error Code................................................................................ 90
6.3 Error Code List........................................................................................ 91
6.4 Canceling of Errors............................................................................... 253
7. TRANSPORTATION PRECAUTIONS ..................................................... 254
7.1 Relevant Models................................................................................... 254
7.2 Transportation Guidelines .................................................................... 254

A-11
This manual describes the operating precautions, input/output connections, and
error codes related to Q4ARCPU (hereafter, all are referred to simply as
"Q4ARCPU") operations.
About Manuals :
Other manuals related to Q4ARCPU operation (shown below) are also available
if necessary.
Detailed manuals
Manual Name Manual No.
Q4ARCPU User's Manual
Discusses Q4ARCPU performance, functions, and operation, and contains
the specifications for the bus switching module, system management
module, power supply, memory card, and base unit. (sold separately)
IB-66685
(13J852)
Related manuals
Manual Name Manual No.
QnACPU Guidebook
This manual is designed for first-time users of the QnACPU. It explains the
procedures for all operations from program creation, to program writing to the
CPU, and program debugging. It also explains how to use the
QnACPU special features.
IB-66606
(13JF10)
QnACPU Programming Manual (Fundamentals)
This manual explains the programming procedures required for program
creation. It also explains the device names, parameters, and program types.
(sold separately)
IB-66614
(13JF46)
QCPU(Q mode)/QnACPU Programming Manual (Common Instructions)
This manual explains how to use the sequence instructions, basic
instructions, and application instructions. (sold separately)
SH-080039
(13JF58)
QnACPU Programming Manual (Special Function Module)
This manual explains the dedicated instructions used with special function
modules at the Q4ARCPU. (sold separately)
SH-4013
(13JF56)
QnACPU Programming Manual (AD57 Instructions)
This manual explains the dedicated instructions used to operate the
AD57(S1) CRT controller module at the Q4ARCPU. (sold separately)
IB-66617
(13JF49)
QCPU(Q mode)/QnACPU Programming Manual (PID Control Instructions)
This manual explains the dedicated instructions used to execute PID control.
(sold separately)
SH-080040
(13JF59)
QCPU(Q mode)/QnACPU Programming Manual (SFC)
This manual explains the system configuration, performance specifications,
functions, programming, debugging, and error codes and others of
MELSAP3. (sold separately)
SH-080041
(13JF60)
I/O module type Building block User's Manual
This manual gives the specifications for building- block type I/O modules.
(sold separately)
IB-66140
(13J643)

1
1. SPECIFICATIONS
1.1 SPECIFICATIONS
Table 1.1 General specification
Item Specifications
Ambient operating
temperature 0 to 55 °C
Ambient storage
temperature −20 to 75 °C
Ambient operating
humidity 10 to 90 % RH, No-condensing
Ambient storage
humidity 10 to 90 % RH, No-condensing
Frequency Acceleration Amplitude
No. of
sweeps
10 to 57Hz ⎯⎯ 0.075mm
(0.003in.)
Under
intermittent
vibration 57 to 150Hz 9.8m/s2⎯⎯
10 to 57Hz ⎯⎯ 0.035mm
(0.001in.)
Vibration resistance
Conforming
to JIS B
3502, IEC
61131-2 Under
continuous
vibration 57 to 150Hz 4.9m/s2⎯⎯
10 times
each in
X, Y, Z
directions
(for 80min.)
Shock resistance Conforming to JIS B 3502, IEC 61131-2
(147 m/s2, 3 times in each of 3 directions X Y Z)
Operating ambience No corrosive gases
Operating altitude *3 2000m (6562ft.) max.
Installation location Control panel
Over voltage
category *1 II max.
Pollution degree *2 2 max.
Equipment category Class I
*1: This indicates the section of the power supply to which the equipment is
assumed to be connected between the public electrical power distribution
network and the machinery within premises. Category II applies to equipment
for which electrical power is supplied from fixed facilities. The surge voltage
withstand level for up to the rated voltage of 300 V is 2500 V.
*2: This index indicates the degree to which conductive material is generated in
terms of the environment in which the equipment is used. Pollution level 2 is
when only non-conductive pollution occurs. A temporary conductivity caused
by condensing must be expected occasionally.
*3: The PLC cannot be used or stored under pressure higher than the
atmospheric pressure of altitude 0m (0ft.). Doing so may cause malfunctions.
For use under the higher pressure, consult your local Mitsubishi
representative.

2
2. PERFORMANCE SPECIFICATIONS
2.1 Q4ARCPU Module Performance Specifications
This section gives the Performance specifications of the Q4ARCPU.
Table 2.1 Performance Specifications
Model Name
Item Q4ARCPU Remark
Control system Repeated operation (using stored program)
I/O control method Refresh mode
Direct input using
device names
possible
Language dedicated to sequence control
Programming language Relay symbol language, logic symbolic language,
MELSAP-3 (SFC)
LD 0.075 s/step
Processing speed
(sequence instruction) MOV 0.225
s/step
Constant scan (program
started at fixed time Intervals) 5 to 2000 ms (can be set in 5 ms units) Set by parameter
Memory capacity Capacity of the installed memory card
(max. 2036 k bytes)
Number of steps Max. 124 k stepsProgram
capacity Number of files 124 files
Number of I/O device points 8192 points (X/Y0 to 1FFF)
Number of points
that can be used in
programs
Number of I/O points 4096 points
(X/Y0 to FFF)
Number of points
actually accessible
with I/O modules
Clock function
Year, month, date, hour, minute, second, day of
week (automatic recognition of leap years)
Accuracy −2.3 to +4.4 s (TYP. +1.8 s)/d at 0 °C
Accuracy −1.1 to +4.4 s (TYP. +2.2 s)/d at 25°C
Accuracy −9.6 to +2.7 s (TYP. -2.4 s)/d at 55 °C
Allowable momentary power
interruption time Depends on the power supply module
Internal current consumption
for 5 VDC 1.4 A
Weight 0.9 kg
External dimensions 250 (9.84) ×79.5 (3.13) ×121 (4.76) mm (inch)

3
3. EMC AND LOW VOLTAGE DIRECTIVES
The products sold in the European countries have been required by law to comply
with the EMC and Low Voltage Directives of the EU Directives since 1996 and
1997, respectively.
The manufacturers must confirm by self-declaration that their products meet the
requirements of these directives, and put the CE mark on the products.
3.1 Requirements for Compliance with EMC Directive
The EMC Directive specifies emission and immunity criteria and requires the
products to meet both of them, i.e., not to emit excessive electromagnetic
interference (emission): to be immune to electromagnetic interference outside
(immunity).
Guidelines for complying the machinery including MELSEC-QnA series PLC with
the EMC Directive are provided in Section 3.1.1 to 3.1.6 below.
The guidelines are created based on the requirements of the regulations and
relevant standards, however, they do not guarantee that the machinery
constructed according to them will comply with the Directives.
Therefore, manufacturers must finally determine how to make it comply with the
EMC Directives.
3.1.1 EMC Directive standards
The standards relevant to EMC Directive are listed in the table below:
Specifications Test Item Test Description Standard Values
EN55011 *2
Radiated noise
Measure the emission released by
the product.
30M-230 M Hz QP: 30dBμ
V/m (30m measurement) *1
230M-1000MHz QP: 37dBμ
V/m (30m measurement) *1
EN61000-6-4
(2001)
EN55011 *2
Conduction noise
Measure the emission released by
the product to the power line.
150k-500kHz QP: 79dB,
Mean: 66dB*1
500k-30MHz QP: 73dB,
Mean: 60dB *1
EN61000-4-2 *2
Static electricity
immunity
Immunity test by applying static
electricity to the module
enclosure.
4kV contact discharge
8kV air discharge
EN61000-4-4 *2
First transient burst
noise
Immunity test by applying burst
noise to the power line and signal
line.
2kV Power line
1kv Signal line
EN61000-4-12 *2
Damped oscillatory
wave
Immunity test in which a damped
oscillatory wave is superimposed
on the power line.
1kv
EN61131-2/A12
(2000)
EN61000-4-3 *2
Radiated
electromagnetic field
Immunity test by applying a
radiated electric field to the
product.
10V/m, 26-1000MHz
EN61000-6-2
(2001)
EN61000-4-6 *2
Conduction noise
Immunity test by inducting an
electromagnetic field in the power
line signal line.
10 V/ms, 0.15-80MHZ, 80%
AM modulation@1kHz
(*1) QP: Quasi-peak value, Mean: Average value
(*2) PLCs must be installed inside the conductive control panel, as they are open-type devices (devices
to be incorporated into other equipment). The test was conducted with the PLC installed inside a
control panel.

4
3.1.2 Installation to the control panel
PLCs are open-type devices (devices to be incorporated into other equipment) and
they have to be installed inside the control panel enclosure.* This is very effective
in blocking the noise generated from the PLC with the control panel as well as
ensuring the safety.
*: Also, each network remote station needs to be installed inside the control panel.
However, the waterproof type remote station can be installed outside the control
panel.
(1) Control panel
(a) Use a conductive control panel.
(b) When fixing the top or base plate with bolts, mask the fixing area when
painting so that an electrical contact can be made.
(c) To ensure electrical contact between the control panel door and panel,
remove the paint on the contacting area of the door and panel, apply
conductive gaskets and conducting adhesive tapes and connect the
door and panel with thick crossovers.
(d) Ground the control panel with a thick wire so that a low impedance can
be ensured even at high frequencies.
(e) Holes made in the control panel must be 10cm (3.94inch) diameter or
less. If the diameter is more than 10cm (3.94inch), radio waves can be
leaked.
(f) Ensure the electric contact between the PLC and the inner plate inside
the control panel by galvanizing the inner plate (plating thickness:
10μm or more).
(g) Remove the coating of the bolt-fixing areas of the inner plate to ensure
electric contact with the control panel and conductivity in the largest
area as possible.
REMARK
The specifications and external dimensions of the control panel are provided
on the next page.

5
Example of EMC-compliant control panel
The following shows an example of the control panel concluded by Mitsubishi to be
compliant with EMC Directives. Produce a control panel by referring to the
example.
(a) Internal specifications of control panel
Increase the internal conductivity of the control panel as shown below,
in order to reduce the electromagnetic wave emitted by devices, and
protect the internal devices against the external electromagnetic wave.
Attach EMI gaskets and conducting adhesive tapes so that they will
come in contact with each other. This will increase the conductivity
of doors and control panel.
Galvanize the inner plate to increase the conductivity between the
internal device and control panel.
W
ire
Contact
Inside
of door
Coming into contact with
the doors closed
EMI gasket or the back side
(the obverse side of the door)
*1: Do not apply coating to the parts where EMI gaskets and conducting adhesive tapes are to be attached.
*2: These wires are used to strengthen conductivity between the doors and control panel.
Screw
Shows an inner plate (galvanized at a thickness of 10 m or more) which is fixed
to the control panel with screws for conductivity.
Shows EMI gaskets (STG7-13 (Takeuchi Kogyo Co., Ltd.) or equivalent.
Shows conducting adhesive tapes (TR-9 (Takeuchi Kogyo Co., Ltd.) or equivalent.
Contact
ContactContact
Contact Contact
Wire
Screw
Screw Screw
Screw Screw
Inside
of door
Inside of door Inside of door
Inside
of door
Inside
of door

6
(b) External dimensions of EMC-compliant control panel
600(23.6)
30(1.2)
1800(70.9)
1000(39.4)
Unit: mm (inch)
(2) Installing the power supply line and grounding line
Ground the PLC and install the power supply line as shown below.
(a) Position the grounding point on control panel closer to the power
supply module. Then, ground the power supply module’s LG and FG
terminals (LG: Line Ground, FG: Frame Ground) onto the panel with
the thickest and shortest wires possible. (The wire length must be
within 30cm (11.81 in.) or shorter.) As the LG and FG terminals bring
the noise generated within the PLC to the ground, it is necessary to
keep the impedance as low as possible.
Also, make sure to use the wires shortest as possible for grounding,
as they relieve the noise, i.e., include large amount of noise. Doing so
can prevent the grounding wire from being an antenna.
(b) Twist the ground wire led from the grounding point with the power
cable. By doing this, noise from the power cable can be released to
the ground. If a filter is attached to the power cable, however, this
twisting may not be needed.
(c) Attaching a ferrite core to the twisted power line (and grounding line)
reduces the radiated noise.
ZCAT3035-1330 ferrite core (TDK corporation) is recommended.
For details, refer to Section 3.1.4.

7
3.1.3 Cables
The cables pulled out of the control panel contain a high frequency noise
component. On the outside of the control panel, therefore, they serve as antennas
to emit noise.
Ensure to use shielded cables for the cables, which are connected to the I/O
modules, special modules and those pulled out to outside of the control panel.
Mounting ferrite core is not required except some types of CPU however, noise
emanated via the cable can be restrained using it.
The use of a shielded cable also increases noise resistance. The signal lines
(including common line) connected to the PLC input/output modules and intelligent
modules use shielded cables to assure noise resistance, as a condition,
standardized on EN61131-2/A12(2000).
If a shielded cable is not used or not earthed correctly, the noise resistance will be
less than the rated value
(1) Earthing of shielded of cables
(a) Earth the shield of the shielded cable as near the unit as possible taking
care so that the earthed cables are not induced electromagnetically by
the cable to be earthed.
(b) Take appropriate measures so that the shield section of the shielded
cable from which the outer cover was partly removed for exposure is
earthed to the control panel on an increased contact surface. A clamp
may also be used as shown in the figure below. In this case, however,
apply a cover to the painted inner wall surface of the control panel which
comes in contact with the clamp.
Shield sectio
n
Screw
Shielded cable
Paint mask
Clamp fitting
Note) The method of earthing by soldering a wire onto the shield section of
the shielded cable as shown below is not recommended. The high
frequency impedance will increase and the shield will be ineffective.
Shielded cable
Wire
Crimp terminal