Mitsubishi Electric Melsec A Series User manual

MELSECASeries
Programmable Controllers
User's Manual
(Hardware)
AnN/AnA/AnUCPU
MITSUBISHI ELECTRIC
MITSUBISHI ELECTRIC
01 08 2003
IB(NA)66542
Version E
INDUSTRIAL AUTOMATION

A-1
zSAFETY PRECAUTIONS z
(Read these precautions before using.)
When using Mitsubishi equipment, thoroughly read this manual and the
associated manuals introduced in this manual.
Also pay careful attention to safety and handle the module properly.
These z
zz
zSAFETY PRECAUTIONS z
zz
zclassify the safety precautions into two
categories: "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.
[DESIGN PRECAUTIONS]
DANGER
Install a safety circuit external to the PLC that keeps the entire system
safe even when there are problems with the external power supply or the
PLC module. Otherwise, trouble could result from erroneous output or
erroneous operation.
(1) Outside the PLC, construct mechanical damage preventing interlock
circuits such as emergency stop, protective circuits, positioning upper
and lower limits switches and interlocking forward/reverse operations.
CAUTION
DANGER

A-2
[DESIGN PRECAUTIONS]
DANGER
(2) When the PLC detects the following problems, it will stop calculation
and turn off all output in the case of (a). In the case of (b), it will stop
calculation and hold or turn off all output according to the parameter
setting.
Note that the AnS series module will turn off the output in either of
cases (a) and (b).
(a) The power supply module has over current
protection equipment and over voltage protection equipment.
(b) The PLC CPUs self-diagnosis functions, such as the watch dog
timer error, detect problems.
In addition, all output will be turned on when there are problems that
the PLC CPU cannot detect, such as in the I/O controller. Build a fail
safe circuit exterior to the PLC that will make sure the equipment
operates safely at such times. See section 9.1 of this manual for
example fail safe circuits.
(3) Output could be left on or off when there is trouble in the outputs
module relay or transistor. So build an external monitoring circuit that
will monitor any single outputs that could cause serious trouble.
When overcurrent which exceeds the rating or caused by short-circuited
load flows in the output module for a long time, it may cause smoke or
fire. To prevent this, configure an external safety circuit, such as fuse.
Build a circuit that turns on the external power supply when the PLC main
module power is turned on. If the external power supply is turned on
first, it could result in erroneous output or erroneous operation.
When a data link results in a communication error, the faulty station
changes in operating status depending on the used data link type.
(1) For the data link data, the data prior to the communication error will be
held.
(2) The MELSECNET (II,/B,/10) remote I/O station will turn all output off.
(3) The MELSECNET/MINI-S3 remote I/O station will hold the output or
turn all output off depending on the E.C. remote setting.
Refer to the data link manuals regarding the method for setting the
communication problem station and the operation status when there are
communication problem.

A-3
[DESIGN PRECAUTIONS]
DANGER
When connecting a peripheral device to the CPU module or connecting a
personal computer or the like to the intelligent function module to
exercise control (data change) on the running PLC, configure up an
interlock circuit in the sequence program to ensure that the whole
system will always operate safely.
Also before exercising other control (program change, operating status
change (status control)) on the running PLC, read the manual carefully
and fully confirm safety.
Especially for the above control on the remote PLC from an external
device, an immediate action may not be taken for PLC trouble due to a
data communication fault.
In addition to configuring up the interlock circuit in the sequence program,
corrective and other actions to be taken as a system for the occurrence of
a data communication fault should be predetermined between the external
device and PLC CPU.
When configuring a system, do not leave any slots vacant on the base.
Should there be any vacant slots, always use a blank cover (A1SG60) or
dummy module (A1SG62).
When the extension base A1S52B, A1S55B or A1S58B is used, attach the
dustproof cover supplied with the product to the module installed in slot
0.
If the cover is not attached, the module's internal parts may be
dispersed when a short-circuit test is performed or
overcurrent/overvoltage is accidentally applied to the external I/O area.
CAUTION
Do not bunch the control wires or communication cables with the main
circuit or power wires, or install them close to each other. They should
be installed 100 mm (3.94 inch) or more from each other. Not doing so
could result in noise that would cause erroneous operation.
When 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.

A-4
[INSTALLATION PRECAUTIONS]
CAUTION
Use the PLC in an environment that meets the general specifications
contained in this manual. Using this PLC in an environment outside the
range of the general specifications could result in electric shock, fire,
erroneous operation, and damage to or deterioration of the product.
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.
When installing extension cables, be sure that the connectors of base
unit are installed correctly. After installation, check them for looseness.
Poor connections could cause an input or output failure.
Correctly connect the memory cassette installation connector to the
memory cassette. After installation, be sure that the connection is not
loose. A poor connection could cause an operation failure.
Completely 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.
Do not directly touch the module's conductive parts or electronic
components. Touching the conductive parts could cause an operation
failure or give damage to the module.

A-5
[WIRING PRECAUTIONS]
DANGER
Completely turn off the external power supply when installing or placing
wiring. Not completely turning off all power could result in electric shock
or damage to the product.
When turning on the power supply or operating the module after
installation or wiring work, be sure that the module's terminal covers are
correctly attached. Not attaching the terminal cover could result in
electric shock.
CAUTION
Be 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.
When wiring in the PLC, be sure that it is done correctly by checking the
product's rated voltage and the terminal layout. Connecting a power
supply that is different from the rating or incorrectly wiring the product
could result in fire or damage.
Do not connect multiple power supply modules in parallel. Doing so
could cause overheating, fire or damage to the power supply module.
External connections shall be crimped or pressure welded with the
specified tools, or correctly soldered. Imperfect connections could result
in short circuit, fires, or erroneous operation.
Tighten the terminal screws with the specified torque. If the terminal
screws are loose, it could result in short circuits, fire, or erroneous
operation. Tightening the terminal screws too far may cause damages to
the screws and/or the module, resulting in fallout, short circuits, or
malfunction.
Be sure there are no foreign substances such as sawdust or wiring
debris inside the module. Such debris could cause fires, damage, or
erroneous operation.
The module has an ingress prevention label on its top to prevent foreign
matter, such as wire offcuts, from entering the module during wiring.
Do not peel this label during wiring.
Before starting system operation, be sure to peel this label because of
heat dissipation.

A-6
[STARTUP AND MAINTENANCE PRECAUTIONS]
DANGER
Do not touch the terminals while power is on.
Doing so could cause shock or erroneous operation.
Correctly connect the battery.
Also, do not charge, disassemble, heat, place in fire, short circuit, or
solder the battery. Mishandling of battery can cause overheating or
cracks which could result in injury and fires.
Switch all phases of the external power supply off when cleaning the
module or retightening the terminal or module mounting screws. Not
doing so could result in electric shock.
Undertightening of terminal screws can cause a short circuit or
malfunction. Overtightening of screws can cause damages to the screws
and/or the module, resulting in fallout, short circuits, or malfunction.

A-7
[STARTUP AND MAINTENANCE PRECAUTIONS]
CAUTION
The online operations conducted for the CPU module being operated,
connecting the peripheral device (especially, when changing data or
operation status), shall be conducted after the manual has been carefully
read and a sufficient check of safety has been conducted.
Operation mistakes could cause damage or problems with of the
module.
Do not disassemble or modify the modules.
Doing so could cause trouble, erroneous operation, injury, or fire.
Use 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.
Switch all phases of the external power supply off before mounting or
removing the module. If you do not switch off the external power supply,
it will cause failure or malfunction of the module.
Do 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.
Always 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
z
zz
zWhen disposing of this product, treat it as industrial waste.
[TRANSPORTATION PRECAUTIONS]
CAUTION
z
zz
zWhen transporting lithium batteries, make sure to treat them based on
the transport regulations. (Refer to Chapter 7 for details of the controlled
models.)

A-8
REVISIONS
*The manual number is given on the bottom right of the front cover.
Print Date *Manual Number Revision
Mar., 1995 IB(NA) 66542-A First edition
Jan., 1996 IB(NA) 66542-B
Sep., 1998 IB(NA) 66542-C Correction
SAFETY PRECAUTIONS, 4.5.2
Addition
SPECIFICATIONS, PERFORMANCE
SPECIFICATIONS, EMC STANDARDS,
LOW-VOLTAGE INSTRUCTION
Deletion
I/O MODULE SPECIFICATIONS AND
CONNECTIONS
Dec., 2002 IB(NA) 66542-D Equivalent to Japanese version G
Addition
Chapter 5
Partial corrections
SAFETY PRECAUTIONS, 1.1, 2.1.1,
2.1.2, 2.1.3, Chapter 3, 4.1.3, 4.2, 4.3.1,
4.3.2,4.3.3, 4.5.2, Chapter 6
Aug., 2003 IB(NA) 66542-E Addition
Chapter 7
Partial corrections
SAFETY PRECAUTIONS, Section 6.1
Japanese Manual Version IB(NA)68438-H
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.
©1995 Mitsubishi Electric Corporation

A-9
This manual describes EMC DIRECTIVE AND LOW-VOLTAGE INSTRUCTION,
the handling precautions, and error codes of the following CPUs:
z
zz
zA1NCPU(P21(-S3)/R21), A2NCPU(P21(-S3)/R21), A2NCPU(P21/R21)-S1(-S4),
A3NCPU(P21(-S3)/R21) (abbreviated to AnNCPU in this manual)
z
zz
zA2ACPU(P21(-S3)/R21), A2ACPU(P21/R21)-S1(-S4), A3ACPU(P21(-S3)/R21)
(abbreviated to AnACPU in this manual)
z
zz
zA2UCPU, A2UCPU-S1, A3UCPU, A4UCPU (abbreviated to AnUCPU in this
manual)
AnNCPU, AnACPU, and AnUCPU are generically abbreviated to CPU in this
manual.
Manuals
The manuals related to these CPUs are listed below.
Refer to the following manuals when necessary.
Detailed manuals
z
zz
zA1N/A2N(S1)/A3NCPU User's Manual (IB-66543)
This manual describes the performance, functions, handling, etc., of the A1NCPU,
A2NCPU(S1), and A3NCPU, and the specifications and handling for the memory
cassette, power supply module, and base unit.
z
zz
zA2A/A3ACPU User's Manual (IB-66544)
This manual describes the performance, functions, handling, etc., of the
A2ACPU(S1) and A3ACPU, and the specifications and handling of the memory
cassette, power supply module, and base unit.
z
zz
zA2U(S1)/A3U/A4UCPU User's Manual (IB-66436)
This manual describes the performance, functions, handling, and so forth of
A2UCPU(S1), A3UCPU, A4UCPU, and the specifications and handling of the
memory cassette, power supply module, and base unit.
Related manuals
z
zz
zACPU/QCPU-A(A mode) Programming Manual (Fundamentals) (IB-66249)
This manual describes programming methods required to create programs,
device names, parameters, types of program, configuration of the memory area,
etc.
z
zz
zACPU/QCPU-A(A mode) Programming Manual (Common Instructions)
(IB-66250)
This manual describes how to use the sequence instructions, basic instructions,
application instructions and micro-computer programs.