Mitsubishi MELSEC A1SCPUC24-R2 Instructions for use

Type A1SCPUC24-R2/A1SHCPU/
A2SHCPU(S1)/A2ASCPU(S1/S30)/
A2USHCPU-S1
Mitsubishi Programmable Controller
User's Manual
(Hardware)
Thank you for purchasing the Mitsubishi programmable controller
MELSEC-A series.
Prior to use, please read both this and relevant manuals
thoroughly to fully understand the product.
MODEL A1S/A2S/A2ASCPU(H/W)-U-E
MODEL
CODE 13JE59
IB(NA)-66468-O(0810)MEE
©1994 MITSUBISHI ELECTRIC CORPORATION

A-1
zSAFETY PRECAUTIONS z
(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, zSAFETY PRECAUTIONS zare 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
zCreate a safety circuit outside the programmable controller to ensure the
whole system will operate safely even if an external power failure or a
programmable controller 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 programmable
controller.
Install the emergency stop switch outside the controlpanel so that
workers can operate it easily.
DANGER
CAUTION

A-2
[DESIGN PRECAUTIONS]
DANGER
(2) When the programmable controller detects the following error
conditions, it stops the operation and turn off all the outputs.
yThe overcurrent protection device or overvoltage protection device of
the power supply module is activated.
yThe programmable controller 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 programmable controller 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 programmable
controller.
Refer to "LOADING AND INSTALLATION" in this manual for example
fail safe circuits.
(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.
yIf 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.
yDesign a circuit so that the external power will be supplied after
power-up of the programmable controller.
Activating the external power supply prior to the programmable
controller may result in an accident due to incorrect output or
malfunction.
yFor 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.

A-3
[DESIGN PRECAUTIONS]
DANGER
zWhen controlling a running programmable controller (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
programmable controller in a remote location, some programmable controller
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 programmable controller CPU.
zWhen 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, A1S52B(S1), A1S55B(S1) or
A1S58B(S1), 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.
CAUTION
zDo 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.
zWhen 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.

A-4
[INSTALLATION PRECAUTIONS]
CAUTION
zUse the programmable controller under the environment specified in the
user’s manual.
Otherwise, it may cause electric shocks, fires, malfunctions, product
deterioration or damage.
zInsert the module fixing projection into the fixing hole in the base unit and
then tighten the module mounting screw within the specified torque.
When no screw is tightened, even if the module is installed correctly, it may
cause malfunctions, a failure or a drop of the module.
Tightening the screw excessively may damage the screw and/or the module,
resulting in a drop of the module, a short circuit or malfunctions.
zConnect 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.
zCorrectly 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.
zBe 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.
zDo not directly touch the conductive part or electronic components of the
module.
Doing so may cause malfunctions or a failure of the module.

A-5
[WIRING PRECAUTIONS]
DANGER
zBe 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.
zBefore 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
zAlways ground the FG and LG terminals to the protective ground conductor.
Failure to do so may cause an electric shock or malfunctions.
zWire 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.
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.
zPress, crimp or properly solder the connector for external connection with the
specified tool.
Incomplete connection may cause a short circuit, fire or malfunctions.
zTighten 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.
zCarefully prevent foreign matter such as dust or wire chips from entering the
module.
Failure to do so may cause a fire, failure or malfunctions.
zInstall our programmable controller 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 Type A1SCPUC24-R2/A1SHCPU/
A2SHCPU(S1)/A2ASCPU(S1/S30)/A2USHCPU-S1 User’s Manual (Hardware))

A-6
[STARTUP AND MAINTENANCE PRECAUTIONS]
DANGER
zDo not touch any terminal during power distribution.
Doing so may cause an electric shock.
zProperly 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.
zBe 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
zWhen 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.
zDo not disassemble or modify each of modules.
Doing so may cause failure, malfunctions, personal injuries and/or a fire.
zWhen using a wireless communication device such as a mobile phone, keep
a distance of 25cm (9.84inch) or more from the programmable controller in
all directions.
Failure to do so may cause malfunctions.
zBe 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.
zDo 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.
zDo not install/remove the terminal block more than 50 times after the first use
of the product. (IEC 61131-2 compliant)
zBefore 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-7
[DISPOSAL PRECAUTIONS]
CAUTION
zWhen disposing of the product, treat it as an 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 the
A1SCPU/A1SCPUC24-R2/A2SCPU User's manual.)
[TRANSPORTATION PRECAUTIONS]
CAUTION
zWhen transporting lithium batteries, make sure to treat them based on the
transportation regulations. (Refer to Appendix 2 for details of the relevant
models.)

A-8
REVISIONS
*The manual number is given on the bottom right of the cover.
Print Date *Manual Number Revision
Apr., 1994 IB (NA) 66468-A First edition
Dec., 1994 IB (NA) 66468-B
Jun., 1995 IB (NA) 66468-C
Oct., 1995 IB (NA) 66468-D
Jan., 1996 IB (NA) 66468-E
Apr., 1997 IB (NA) 66468-F
Aug., 1997 IB (NA) 66468-G
Sep., 1998 IB (NA) 66468-H Partial corrections
Safety precautions, 3.1, 3.2, 3.2.1, 3.2.2,
4.5, 5.1
Partial additions
Safety precautions, 4.5
Partial deletions
4.6
Additions
Performance specifications
Deletions
I/O unit specifications and connections,
Appendices
Jan., 2003 IB (NA) 66468-I Equivalent to Japanese version O
Partial additions
5.1, 5.2
Partial corrections
Safety precautions, 1.1, 3, 4.2, 4.4, 4.5.1,
4.5.2, 6.1, 6.2, 6.3
Aug., 2003 IB (NA) 66468-J Partial corrections
Safety precautions, Section 6.1, 6.3
Dec., 2003 IB (NA) 66468-K Addition of model
A1SY42P
Partial corrections
Section 4.2, 5.2.1, 5.2.2
Japanese Manual Version IB(NA)68419-P
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.
©1994 Mitsubishi Electric Corporation

A-9
Print Date *Manual Number Revision
Jul., 2005 IB (NA) 66468-L Partial corrections
Safety precautions, CONTENTS, 1.1, 2.1.1,
2.1.2, 2.1.3, 3 to 6.3,
Appendix 1 to 2.2
Additions
USER PRECAUTONS
Addition of model
A2USHCPU-S1
Oct., 2006 IB (NA) 66468-M Partial corrections
Safety precautions, Section 1.1, 3.1.3,
3.2.4, 3.2.6, 4.1.1, 4.3.2, 4.3.3, 4.3.4, 5.2.1,
5.2.2, 6.2, 6.3, 6.4
May, 2007 IB (NA) 66468-N Partial corrections
Section 3.1.1, 3.1.3, 3.2.7, 4.3.3, 4.3.4,
5.1.2, 5.2.1
Additions
Section 3.1.7
Oct., 2008 IB (NA) 66468-O Partial corrections
SAFETY PRECAUTIONS, USER
PRECAUTONS, Section 3.1, 3.1.1, 3.1.2,
3.1.3, 3.2, 3.2.1, 3.2.2, 3.2.3, 3.2.4, 3.2.5,
3.2.6, 3.2.7, 4.1.3, 4.2, 4.3.1, 4.3.3, 4.3.4,
4.4, 4.7, 5.1.1, 5.2.1
Japanese Manual Version IB(NA)68419-P
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.
©1994 Mitsubishi Electric Corporation

A-10
CONTENTS
1.SPECIFICATIONS............................................................................................................. 1
1.1 SPECIFICATIONS ....................................................................................................... 1
2.PERFORMANCE SPECIFICATIONS................................................................................ 2
2.1 Performance Specifications ......................................................................................... 2
2.1.1 A1SCPUC24-R2 Module Performance Specifications.......................................... 2
2.1.2 AnSHCPU Module Performance Specifications ................................................... 3
2.1.3 A2ASCPU(S1), A2USHCPU-S1 Module Performance Specifications.................. 4
3.EMC DIRECTIVES AND LOW VOLTAGE DIRECTIVES ................................................. 6
3.1 Requirements for Compliance with EMC Directives..................................................... 6
3.1.1 EMC standards ..................................................................................................... 7
3.1.2 Installation instructions for EMC Directive ............................................................ 8
3.1.3 Cables................................................................................................................... 9
3.1.4 Power supply module ......................................................................................... 14
3.1.5 Ferrite core ......................................................................................................... 15
3.1.6 Noise filter (power supply line filter).................................................................... 16
3.1.7 Power line for external power supply terminal .................................................... 16
3.2 Requirements for Compliance with Low Voltage Directives....................................... 17
3.2.1 Standard applied for MELSEC-AnS series programmable controller ................. 17
3.2.2 Precautions when using the MELSEC-AnS series programmable controller...... 17
3.2.3 Power supply ...................................................................................................... 18
3.2.4 Control panel ...................................................................................................... 18
3.2.5 Module installation .............................................................................................. 19
3.2.6 Grounding........................................................................................................... 19
3.2.7 External wiring .................................................................................................... 19
4. LOADING AND INSTALLATION ................................................................................... 20
4.1Installing the Module ................................................................................................... 20
4.1.1 Notes on handling the module ............................................................................ 20
4.1.2 Installation environment...................................................................................... 21
4.1.3 Notes on installing the base unit......................................................................... 22
4.2 Fail-Safe Circuit Concept ........................................................................................... 24
4.3 Wiring......................................................................................................................... 30
4.3.1 Power supply module specifications................................................................... 30
4.3.2 Parts names........................................................................................................ 32
4.3.3 Wiring instructions .............................................................................................. 34
4.3.4 Wiring to module terminals ................................................................................. 39
4.4 Precautions when Connecting the Uninterruptible Power Supply (UPS) ................... 40
4.5 Part Names ................................................................................................................ 41
4.6 RS232C Interface (A1SCPUC24-R2 only)................................................................. 47
4.7 Self-Loopback Test (A1SCPUC24-R2 only) .............................................................. 50
5. SPECIFICATION AND CONNECTION OF I/O MODULES............................................ 51
5.1 Input modules ............................................................................................................ 51
5.1.1 Input module specifications ................................................................................ 51
5.1.2 Input module connections................................................................................... 53
5.2 Output modules.......................................................................................................... 57
5.2.1 Output module specifications.............................................................................. 57
5.2.2 Output module connections................................................................................ 61
5.3 Input/output combined modules................................................................................. 69
5.3.1 Input/output combined module specifications..................................................... 69
5.3.2 Input/output composite module connections ...................................................... 71
6. ERROR CODES............................................................................................................. 74
6.1 Error Code List for A1SCPUC24-R2 .......................................................................... 74
6.2 Error Code List for A1SHCPU and A2SHCPU(S1) .................................................... 81
6.3 Error Code List for A2ASCPU(S1/S30) and A2USHCPU-S1..................................... 89
APPENDICES .................................................................................................................. 105
Appendix 1 CPU-by-CPU Startup Names...................................................................... 105
Appendix 2 Transportation Precautions......................................................................... 105
Appendix 2.1 Relevant Models .................................................................................. 105
Appendix 2.2 Transportation Guidelines.................................................................... 105

A-11
This manual describes cautions on handling, connection to I/O modules, and error
codes of A2ASCPU(S1/S30), and A1SHCPU, A2SHCPU(S1), A1SCPUC24-R2
(hereafter called "the CPU").
Manuals
The following manuals are related to this product.
Refer to the following manuals when necessary.
Detailed manuals
Manual Name Manual No.
(Model Code)
type A1SCPU/A1SCPUC24-R2/A2SCPU User's manual
This manual describes the specifications and functions of
A1S, A1SC24-R2 and A2SCPU(S1), and specifications etc.
of the memory cassettes, the power supply module and
extension base unit.
(Sold separately)
IB-66320
(13J672)
type A2ASCPU(S1/S30) User’s manual
This manual describes the specifications and functions of
A2ASCPU(S1/S30) and the specifications of the memory
cassettes, the power supply modules and extension base
units that can be used with it.
(Sold separately)
IB-66455
type A1SJH/A1SH/A2SHCPU(S1) User’s manual
This manual describes the specifications and functions of
A1SJHCPU, A1SH, and A2SHCPU(S1) and the
specifications of the memory cassettes, the power supply
modules and extension base units that can be used with it.
(Sold separately)
IB-66779
(13JL22)
Computer Link Module User's Manual (Comms. link func./ Print
func.)
This manual describes communication between the
A1SCPUC24-R2 and external devices using the dedicated
protocol, no protocol, and bidirectional modes, and the
settings, wiring, programming, troubleshooting, etc., for this
module.
(Sold separately)
SH-3511
(13JE77)
Computer Link Module Guidebook
This manual gives the basic information required to execute
data communication with external devices (computers, for
example), in each mode of the computer link function.
(Sold separately)
SH-3510
(13JE76)

A-12
Related manuals
Manual Name Manual No.
(Model Code)
ACPU Programming Manual (Fundamentals)
Describes programming methods necessary for creating
programs, device names, parameters, program types,
memory area configuration, and so on.
(Optional)
IB-66249
(13J740)
ACPU Programming Manual (Common Instructions)
Describes how to use the sequence instruction, basic
instructions, applied instructions and microcomputer
programs.
(Optional)
IB-66250
(13J741)
AnSHCPU/AnACPU/AnUCPU/QCPU-A (A mode)
Programming Manual (Dedicated Instructions)
Describes instructions that have been expanded for
A1SJHCPU/A1SHCPU/A2SHCPU(S1).
(Optional)
IB-66251
(13J742)
AnS Module type I/O User’s Manual
Describes the specification of the compact building block
type I/O module.
(Optional)
IB-66541
(13JE81)

A-13
USER PRECAUTONS
Precautions when using the AnS series
For a new CPU module, which has never used before, the contents of built-in RAM
and device data are undefined.
Make sure to clear the built-in RAM memory (PC memory all clear) in the CPU
module by peripheral devices and operate latch clear by RUN/STOP key switches.
Precautions for battery
(1) The operation after a battery is unmounted and the programmable
controller is stored.
When reoperating after a battery is uncounted and the programmable
controller is stored, the contents of built-in RAM and device data may be
undefined. For this reason, make sure to clear the built-in RAM memory (PC
memory all clear) in the CPU module by peripheral devices and operate
latch clear by RUN/STOP key switch before start the operation again.
(2) If a battery exceeded its guaranteed life is stored and reoperated.
If a battery exceeded its guaranteed life is stored and reoperated, the
contents of built-in RAM and device data may be undefined. For this reason,
make sure to clear the built-in RAM memory (PC memory all clear) in the
CPU module by peripheral devices and operate latch clear by RUN/STOP
key switches before start the operation again.
After the built-in RAM clear and latch clear of the CPU module, write the
backed-up memory contents to the CPU module before saving.
POINT
Make sure to back-up each memory contents before storing the
programmable controller.
*: Refer to the following manuals for details of built-in RAM clear (programmable
controller memory all clear) by peripheral devices.
GX Developer Operating Manual
A6GPP/A6PHP Operating Manual
SW SRX/SW NX/SW IVD-GPPA Operating Manual
Refer to Section 4.6 for latch clear operation by RUN/STOP key switch of the
CPU module.

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
intermitten
t vibration 57 to 150Hz 9.8m/s2⎯⎯
10 to 57Hz ⎯⎯ 00.35mm
(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
(147m/s2, 3 times in each of 3 directions X Y Z)
Operating
ambience No corrosive gases
Operating
elevation *3 2000m (6562ft.) max.
Installation
location Control panel
Over voltage
category *1 II max.
Pollution level *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 : Do not use or store the PC in the environment when the pressure is higher
than the atmospheric pressure at sea level. Otherwise, malfunction may
result. To use the PC in high-pressure environment, contact your nearest
Mitsubishi representative.

2
2. PERFORMANCE SPECIFICATIONS
2.1 Performance Specifications
2.1.1 A1SCPUC24-R2 Module Performance Specifications
The memory capacity, device performances and other specifications of
A1SCPUC24-R2 module are provided below.
Table 2.1 Performance specifications
Type
Item A1SCPUC24-R2
Control system Repeated operation (using stored program)
I/O control method Refresh mode/Direct mode selectable
Programming language Language dedicated to sequence control. Relay symbol type and
logic symbolic language, MELSAP-II (SFC) (for A1SCPU)
Processing speed
(sequence instruction)
Direct : 1.0 to 2.3 µs/step
Refresh : 1.0 µs/step
Number of I/O points 256 points (32 points are used for the computer link function)
Watchdog timer (WDT) 10 to 2000 ms
Memory capacity *1 (built-in RAM) 32k bytes
Main sequence Max. 8 k steps
Program capacity Sub sequence None
Self-diagnostics functions Watchdog error monitor, Memory error detection, CPU error
detection, I/O error detection, Battery error detection, etc.
Operation mode at the time of error STOP/CONTINUE
Start method at the time of RUN
Initial start
(Automatic restart by turning on the "RUN" switch of the CPU after
power-ON/recovery from power failure)
STOP →RUN output mode Output data at time of STOP restored/data output after operation
execution
Clock function
Year, month, day, hour, minute, second (Automatically recognizes
leap years.)
Accuracy −2.3 to +4.4 s (TYP. +1.8 s)/d at 0 °C
−1.1 to +4.4 s (TYP. +2.2 s)/d at 25 °C
−9.6 to +2.7 s (TYP. -2.4 s)/d at 55 °C
Allowable momentary power
interruption time 20 ms
Current consumption (5 V DC) 0.56 A
Weight 0.41 kg
Standard UL/CSA
*1 : The maximum total memory that can be used for parameters, T/C set values,
program capacity, file registers, number of comments, sampling trace, and
status latch is 32k/64k bytes.
The memory capacity is fixed. No expansion memory is available.
Section 4.1.7 shows how to calculate the memory capacity.

3
2.1.2 AnSHCPU Module Performance Specifications
The memory capacity, device performances and other specifications of AnSHCPU
modules are provided below.
Table 2.2 Performance specifications
Type
Item A1SHCPU A2SHCPU(S1)
Control system Repeated operation (using stored program)
I/O control method Refresh mode/Direct mode selectable
Programming language Language dedicated to sequence control. Relay symbol type and
logic symbolic language, MELSAP-II(SFC)
Processing speed
(sequence instruction)
Direct : 0.33 to 2.2 µs/step
Refresh : 0.33 µs/step
Direct : 0.25 to 2.15 µs/step
Refresh : 0.25 µs/step
Number of I/O device points 2048 *2
Number of I/O points 256 points A2SH : 512 points,
A2SH-S1 : 1024 points
Watchdog timer (WDT) 10 to 2000 ms
Memory capacity *1
(built-in RAM) 64k bytes A2SH : 64 k bytes, A2SH-S1 : 192 k bytes
Main sequence Max. 8 k steps A2SH : Max. 14 k steps,
A2SH-S1 : Max. 30 k steps
Program capacity
Sub sequence Unavailable
Self-diagnostics functions Watchdog error monitor, Memory error detection, CPU error
detection, I/O error detection, Battery error detection, etc.
Operation mode at the time of error STOP/CONTINUE
STOP →RUN output mode Output data at time of STOP restored/data output after operation
execution
Start method at the time of RUN
Initial start
(Automatic restart by turning on the "RUN" switch of the CPU after
power-ON/recovery from power failure)
Clock function
Year, month, day, hour, minute, second (Automatically recognizes
leap years.)
Accuracy −3.1 to +5.3 s (TYP. +1.7 s)/d at 0 °C
−1.6 to +5.3 s (TYP. +2.4 s)/d at 25 °C
−9.6 to +3.6 s (TYP. -2.1 s)/d at 55 °C
Allowable momentary power failure
period 20 ms (1 ms or less for the A1S63P only.)
Current consumption (5 V DC) 0.3 A 0.4 A
Weight 0.33 kg 0.33 kg
Standard UL/cUL UL/cUL
*1 : The maximum total memory that can be used for parameters, T/C set values,
program capacity, file registers, number of comments, sampling trace, and
status latch is 32 k/64 k bytes. The memory capacity is fixed. No expansion
memory is available. Section 4.1.7 shows how to calculate the memory
capacity.
*2 : The I/O device after the actual input points can be used as MELSECNET(/B),
MELSECNET/MINI-S3, or CC-Link.

4
2.1.3 A2ASCPU(S1), A2USHCPU-S1 Module Performance Specifications
The memory capacity, device performances and other specifications of
A2ASCPU(S1/S30) modules are provided below.
Table 2.3 Performance specifications
Performance
Item A2ASCPU A2ASCPU-S1 A2ASCPU-S30 A2USHCPU-S1 Remarks
Control system Stored program, repeated operation
I/O control method Refresh method
Instructions to
enable partial
direct I/O are
available.
Language dedicated to sequence control
Programming
language Combined use of relay symbol type, logic symbolic language
and MELSAP-II(SFC)
Processing speed
(sequence instruction) 0.2 µs/step 0.09 µs/step
Constant scan
(program start at
specified intervals)
Can be set between 10 ms and 190 ms in 10 ms increments Set in special
register D9020.
Memory capacity 64 kbytes
(built-in RAM)
256 kbytes
(built-in RAM)
Memory cassettes A2SMCA-14KP/14KE
A2SMCA-14KP/
14KE
A2SMCA-30KE
Main
sequence
program
Max. 14k steps Max. 30K steps Set in
parameters.
Program
capacity Sub
sequence
program
None None
Number of I/O device
points 8192 points (X/Y0 to 1FFF)
The number of
points usable in
the program
Number of I/O points 512 points (X/Y0 to 1FF) 1024 points (X/Y0 to 3FF)
The number of
points which
can be used for
accessibility to
I/O modules

5
Table 2.3 Performance specifications (Continued)
Performance
Item A2ASCPU A2ASCPU-S1 A2ASCPU-S30 A2USHCPU-S1 Remarks
Output mode switching
at STOP →RUN
Selection of re-output of operation state before STOP
(default)/output after operation execution
Set in
parameters.
Self-diagnostic functions
Watchdog error timer (watchdog timer 200 ms fixed) Memory
error detection, CPU error detection, I/O error detection,
battery error detection, etc.
Refer to
Section 4.3.1
for details.
Operation mode at error
occurrence Stop or continue selectable
Set in
parameters.
(Refer to
Section 4.4.1.)
Starting method at RUN
Initial start (Automatic restart when "RUN" switch is moved to
ON position at power-on, at power restoration after power
failure)
Latch (power failure
compensation) range
Defaults to L1000 to L2047 (Latch range can be set for L, B,
T, C, D and W relays.)
Set range in
parameters.
Remote RUN/PAUSE
contact
One RUN contact and one PAUSE contact can be set within
the range from X0 to X1FF (A2AS) or X3FF
(A2AS-S1/A2USH-S1)
Set range in
parameters.
Clock function
Year, month, day, hour, minute, second (Automatically
recognizes leap years.)
Accuracy
− 3.1 to +5.3 s (TYP. +1.7 s)/d at 0 ° C
− 1.6 to +5.3 s (TYP. +2.4 s)/d at 25 ° C
− 9.6 to +3.6 s (TYP. -2.1 s)/d at 55 ° C
Allowable momentary
power failure time Depends on used power supply module Refer to Section 6.1.
5 VDC internal power
consumption 0.32 A
Weight 0.41 kg 0.46 kg
External dimensions 130 ×54.5 ×93.6 (5.12 ×2.15 ×3.69) mm (inch)
CAUTION
When the existing system software package and peripheral devices are
used, the applicable device range is limited. Refer to Section 1.3 for
details.