Mitsubishi A-Melsec A1FXCPU User manual

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•SAFETY PRECAUTIONS •
(Read these precautions before using.)
Before using this product, please read this manual and the relevant manuals introduced in this manual
carefully and pay full attention to safety to handle the product correctly.
The instructions given in this manual are concerned with this product.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
Procedures which may lead to a dangerous condition and cause
death or serious injury if not carried out properly.
Procedures which may lead to a dangerous condition and cause
superficial to medium injury, or physical damage only, if not carried
out properly.
Depending on circumstances, procedures indicated by CAUTION may also be linked to serious
results.
In any case, it is important to follow the directions for usage.
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.
[Designing Instructions]
WARNING
zProvide safety circuits outside the PLC to ensure that the system operates safely if an external
power fault or PLC failure occurs.
Not doing so may cause misoutput or misoperation.
(1) Configure up circuits, e.g. an emergency stop circuit, a protective circuit, interlock circuits for
forward/reverse rotation and other opposite operations, and interlock circuits for machine
damage prevention such as upper and lower positioning limits, outside the PLC.
Refer to section 4.2 of this manual for example an interlock circuits.
(2) When the PLC detects either of the following faulty conditions, it stops operation and switches
off all outputs.
• The overcurrent or overvoltage protector of the power supply module is activated.
• The self-diagnostic function of the PLC CPU detects a fault such as a watchdog timer error.
Faults undetectable by the PLC CPU, e.g. a fault at the I/O control section may cause all
outputs to switch on. Build a fail safe circuit exterior to the PLC that will make sure the
equipment operates safely at such times.
Refer to section 4.2 of this manual for example fail safe circuits.
(3) The output current of the service power supply for sensor differs according to the model and
whether there are extension blocks or not. If overload occurs, the voltage drops automatically,
PLC inputs become inoperative, and all outputs switch off. The external circuit and
mechanism should be designed to ensure that the machine operates safely at such a time.
(4) Some failures of relays, transistors and other devices of the output module may cause
outputs to turn on or off. An external monitoring circuit should be provided to monitor output
signals which may lead to a serious accident.
DANGER
CAUTION

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[Designing Instructions]
WARNING
zIf a current higher than the rating or an overcurrent due to a load short-circuit, etc. kept on flowing
for a long time in the outputs, fuming or combustion may occur. To prevent this, provide an
external safety circuit such as a fuse.
zConfigure up a circuit so that the external supply power is switched on after the power of the PLC
is switched on.
If the external supply power is switched on first, an accident may occur due to misoutput or
misoperation.
zWhen a communication fault occurs in inter-PLC link, the faulty station retains the data prior to the
occurrence of the communication fault.
Using communication status data, make up an interlock circuit in the sequence program to ensure
that the system operates safely.
Not doing so may cause an accident due to misoutput or misoperation.
For an interlock circuit example, how to check a faulty station, and operating status at
communication fault occurrence, refer to the A1FXCPU User's Manual (Function description).
CAUTION
zDo not bundle control or communication cables with the main circuit, power or other lines or lay
them near these lines. As a guideline, separate the cables at least 100mm (3.94 inch).
A failure to do so can cause misoperation due to noise.
zWhen controlling items like lamp load, heater or solenoid valve using an output module, large
current (approximately ten times greater than that present in normal circumstances) may flow
when the output is turned OFF to ON.
Take measures such as replacing the module with one having sufficient rated current.
[Installation Precautions]
CAUTION
zUse the PLC in an environment that conforms to the general specifications given in this manual.
Not doing so can cause an electric shock, fire, misoperation or product damage or deterioration.
zCompletely turn off the external power supply before loading or unloading the module. Not doing
so could result in electric shock or damage to the product.
zDo not touch the conductive areas and electronic parts of the module directly.
Doing so can cause the module to misoperate or fail.

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[Wiring Precautions]
DANGER
zBefore starting mounting, wiring or other work, always switch power off externally in all phases.
Not doing so may cause an electric shock or product damage.
zWhen switching power on or starting operation after mounting, wiring or other work, always fit the
supplied terminal cover to the product.
Not doing so can cause an electric shock.
CAUTION
zBe sure to ground the FG terminals and LG terminals to the protective ground conductor.
Not doing so could result in electric shock or erroneous operation.
zWire the module correctly after confirming the rated voltage and terminal arrangement of the
product.
A fire or failure can occur if the power supply connected is different from the rating or wiring is
incorrect.
zDo not connect the A1FXCPU and extension module service power supply outputs in parallel.
Doing so can cause the power supply module to overheat, leading to a fire or failure.
zDo not supply external power to the +24V/24G terminals of the A1FXCPU and the 24+
terminal of the extension module.
Also, do not wire the empty terminal (NC) of the A1FXCPU and the empty terminal of
the extension module externally.
Doing so may cause product damage.
zTighten the terminal screws to the specified torque.
Undertightening can cause a short circuit, fire or misoperation.
Overtightening can cause a drop, short circuit or misoperation due to damaged screws or
module.
zEnsure that foreign matters such as chips and wire off-cuts do not enter the module.
They can cause a fire, failure or misoperation.
zDo not connect multiple power supply modules to one module in parallel.
The power supply modules may be heated, resulting in a fire or failure.

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[Starting and Maintenance Precautions]
DANGER
zDo not touch the terminals while power is on.
This can cause an electric shock or misoperation.
zConnect the battery correctly. Do not recharge, disassemble, heat, short or solder the battery or
throw it into fire.
Improper handling of the battery may result in injury or fire due to heating, burst, combustion, etc.
zBefore starting cleaning or terminal screw retightening, always switch power off externally in all
phases.
Not doing so can cause an electric shock.
Overtightening can cause a drop, short circuit or misoperation due to damaged screws or
module.
CAUTION
zBefore starting online operation with the peripheral connected to the running CPU module
(especially program modification, forced output, operating status change), carefully read the
manual and fully ensure safety.
Not doing so can cause machine damage or accident due to operational mistakes.
zUse any radio communication device such as a cellular phone or a PHS phone more than 25cm
(9.85 inch) away from the PLC. Not doing so can cause a malfunction.
zDo not disassemble or modify each module.
This can cause a failure, misoperation, injury or fire.
zCompletely turn off the external power supply before loading or unloading the module. Not doing
so could result in electric shock or damage to the product.
zDo not drop or give an impact to the battery installed in the module.
Otherwise the battery will be broken, possibly causing internal leakage of electrolyte. Do not use
but dispose of the battery if it has fallen or an impact is given to it.
zAlways make sure to touch the grounded metal to discharge the electricity charged in the
electricity charged in the body, etc., before touching the module.
Failure to do say cause a failure or malfunctions of the module.
[Disposal Precautions]
CAUTION
zWhen disposing of this product, treat it as industrial waste.
When disposing of batteries, separate them from other wastes according to the local regulations.
(For details of the battery directive in EU member states, refer to Appendix 4.)
[Transportation Precautions]
CAUTION
zWhen transporting lithium batteries, make sure to treat them based on the transport regulations.
(Refer to section Appendix 3 of this manual for details of the controlled models.)

Revisions
*The manual number is noted at the lower left of the back cover.
Print Date *Manual Number Revision
Feb., 1998 IB(NA)-66839-A First printing
Feb., 1998 IB(NA)-66839-B Correction
CONTENTS, Section 2.1.1, 2.2.2, 2.4.1, 2.4.2, 2.5.2, 2.6.2, 2.7, 2.8, 3.1,
3.2, 4.1, 4.2, 7.1, 7.3, Appendix 1, Appendix 2.1
Dec., 2005 IB(NA)-66839-C Partial correction
SAFETY PRECAUTIONS, Manual Makeup, Related Manuals,
CONTENTS, Section 1.4, 2.2.1, 2.3.2, 2.7, 2.8, 4.2, 5.1, 5.1.2, 5.1.3,
5.1.4, 5.2, 5.2.5, 6.2.2, 6.3.1, 6.5, 7.3.2, Appendix 1
Addition
Section 6.7, Appendix 3, Appendix 3.1, Appendix 3.2
Deletion
Appendix 2.2
Jul., 2007 IB(NA)-66839-D Partial correction
Section 2.8, 5.2.4
Oct., 2008 IB(NA)-66839-E Partial correction
SAFETY PRECAUTIONS, Section 6.3.1, Appendix 1
Addition
Appendix 4, Appendix 4.1, Appendix 4.2
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.
©1998 Mitsubishi Electric Corporation

[Manual Makeup]
There are three different manuals related to the A1FXCPU. setup, function
description and maintenance manuals.
Type A1FXCPU module
User's Manual (Setup)
(A5 size, included in
the packing)
(A4 size, optional)
Type A1FXCPU module
User's Manual
(Function description)
Type A1FXCPU module
User's Manual
(Maintenance)
(A5 size, optional)
1) A1FXCPU user's manual (Setup)
This manual provides procedures from product and accessory checkup to
installation and wiring to be followed after you have purchased the A1FXCPU and
unpacked the package.
The setup manual describes the following items.
·A1FXCPU performances (CPU section, power supply section, built-in functions)
·Names of parts
·Settings of parts (hardware settings)
·I/O number assignment
·EMC Directive, Low Voltage Directive
·Installation of A1FXCPU
·External wiring
·Outline dimension drawings
2) A1FXCPU user's manual (Function description)
This manual includes the explanation, data setting and programming of the built-in
functions added to the A1FXCPU, I/O number assignment needed for I/O control,
methods of communication with special modules/special blocks, error codes and
other information.
The function description manual describes the following items.
·System configuration
·Performances of A1FXCPU(CPU section, power supply section, built-in functions)
·Built-in functions of A1FXCPU(simple inter-PLC link, simple positioning,
high-speed counter, external interrupt)
·I/O number assignment
·Communication with special modules/special blocks
·Error codes
·Special relays, special registers
·Outline dimension drawings
3) A1FXCPU user's manual (Maintenance)
This manual explains the inspection of a system using the A1FXCPU and
troubleshooting at error occurrence.
The Maintenance manual describes the following items.
·Names of parts
·Settings of parts
·Maintenance and inspection
·Troubleshooting
·Special relays, special registers
Refer to ACPU/QCPU-A (A mode) programming manuals for the instructions needed
for devices and programming of the A1FXCPU, and to GX Developer operating
manuals for peripheral operation to be performed for programming.

GX Developer operating manuals
ACPU/QCPU-A (A mode)
programming manuals
(Fundamentals,Common instructions)
Type A1FXCPU CPU module
user's manual
(Setup)
1)
(A5 size, included in the packing)
Type A1FXCPU CPU module
user's manual
(Function description)
2)
(A4 size, optional)
3)
Type A1FXCPU CPU module
user's manual
(Maintenance)
(A5 size, optional)
[A1FXCPU Manuals] [Relevant Manuals]
[Operation Sequence in Time Series]
Product check
Installation
Hardware setting
Connection
Operation
Maintenance
and inspection
Troubleshooting
Disposal
Single module test
Programming
Function description

About This Manuals
The following product manuals are available. Please use this table as a reference to request
the appropriate manual as necessary.
Related Manuals
Manual Name Manual No.
(Model Code)
Type A1FXCPU module user's manual (Maintenance)
Provides maintenance/inspection and troubleshooting procedures of the module for
use of the A1FXCPU.
(Option)
SH-4003
(13JL58)
Type A1FXCPU module user's manual (Function description)
Includes the system configuration, performance specifications, functions, handling, I/O
number assignment and error codes of the A1FXCPU.
(Option)
SH-4002
(13JL59)
ACPU/QCPU-A (A mode) Programming Manual (Fundamentals)
Offers programming methods, device names, parameters, program types, memory
area makeup, etc. needed to write programs.
(Option)
IB-66249
(13J740)
ACPU/QCPU-A (A mode) Programming Manual (Common Instruction)
Gives how to use sequence, basic and application instructions and microcomputer
programs.
(Option)
IB-66250
(13J741)
Type MELSAP-II Programming Manual
Provides specifications, functions, instructions, programming methods, etc. needed
when the MELSAP-II is used for programming with SFC programs.
(Option)
IB-66361
(13JF40)
POINT
For the FX series, refer to the manual you use.