Mitsubishi Electric A1S66ADA User manual

Mitsubishi Programmable Logic Controller
Analog Input/Output Module Type A1S66ADA
User,s Manual
MODEL
MODEL
CODE
A1S66ADA-U-E
13JL41
IB(NA)-66819-F(0410)MEE
Analog Input/Output Module Type A1S66ADA
User,s Manual
Specifications subject to change without notice.
When exported from Japan, this manual does not require application to the
Ministry of Economy, Trade and Industry for service transaction permission.
HEAD OFFICE : 1-8-12, OFFICE TOWER Z 14F HARUMI CHUO-KU 104-6212,JAPAN
NAGOYA WORKS : 1-14 , YADA-MINAMI 5-CHOME , HIGASHI-KU, NAGOYA , JAPAN

A - 1 A - 1
•SAFETY PRECAUTIONS •
(Always read these instructions before using this equipment.)
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. For the safety instructions of the
programmable controller system, please read the CPU module user's manual.
In this manual, the safety instructions are ranked as "DANGER" and "CAUTION".
!DANGER
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 medium or slight personal injury or physical damage.
Note that the !CAUTION level may lead to a serious consequence according to the circumstances.
Always follow the instructions of both levels because they are important to personal safety.
Please save this manual to make it accessible when required and always forward it to the end user.
[DESIGN PRECAUTIONS]
!DANGER
•In case of the external power supply failure or the programmable controller ( PLC ) failure, set up
a safety circuit outside the PLC so that the entire system can operate safely. The mis-output
and malfunction may cause an accident.
!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, fires, malfunctions, and damage to or deterioration of the product.
•Do not bunch the control wires 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. Failure to do so
may result in noise that would cause malfunctions.
•At power ON/OFF, voltage or current may instantaneously be output from the output terminal of
this module.
In such case, wait until the analog output becomes stable to start controlling the external device.
[INSTALLATION PRECAUTIONS]
!CAUTION
•Insert the tabs at the bottom of the module into the mounting holes in the base unit. If the
module is not properly installed, it may result in malfunctions, failure, or fallout.
•Do not directory touch the module's conductive parts. Doing so could cause malfunctions or
failure in the module.

A - 2 A - 2
[WIRING PRECAUTIONS]
!CAUTION
•Ground the AG and FG terminals to the protected grounding conductor when there are a lot of
noise. Failure to ground these terminals may cause malfunctions.
•When wiring PLC, check the rated voltage and terminal layout of the wiring, and make sure the
wiring is done correctly. Connecting a power supply that differs from the rated voltage or wiring
it incorrectly may cause fires or failure.
•Tighten the terminal screws within the range of specified torque.
If the terminal screws are loose, it may result in short circuits or malfunctions.
Tightening the screws too far may cause damage to the screw, resulting in short circuits, or
malfunctions.
•Be sure there are no foreign substances such as sawdust or wiring debris inside the module.
Such debris could cause fires, failure, malfunctions.
[STARTING AND MAINTENANCE PRECAUTIONS]
!CAUTION
•Do not touch the connector while the power is on. Doing so could cause malfunctions.
•Be sure to shut off all phases of the external power supply used by the system before cleaning
or retightening the terminal screws. If you do not switch off the external power supply, it will
cause failure or malfunctions of the module.
•Do not disassemble or modify the modules. Doing so could cause failure, malfunctions, injury, or
fires.
•Be sure to shut off all phases of the external power supply used by the system before mounting
or dismounting the module. If you do not switch off the external power supply, it will cause failure
or malfunctions of the module.
•Do not install/remove the terminal block more than 50 times after the first use of the product.
(IEC 61131-2 compliant)
•Before handling the module, always touch grounded metal, etc. to discharge static electricity
from the human body.
Failure to do so can cause the module to fail or malfunction.
[OPERATING PRECAUTIONS]
!DANGER
•Do not output (turn ON) the "usage disable" signal as an output signal to special modules from
the PLC CPU.
Outputting the "usage disable" signal may cause PLC system malfunctions.
[DISPOSAL PRECAUTIONS]
!CAUTION
•When disposing of this product, treat it as industrial waste.

A - 3 A - 3
REVISIONS
The manual number is given on the bottom left of the back cover.
Print Date Manual Number Revision
Jan., 1998 IB(NA)-66819-A First printing
Feb., 1998 IB(NA)-66819-B
Correction
Section 4.4
Apr., 2001 IB(NA)-66819-C
Addition
WARRANTY
Correction
SAFETY PRECAUTIONS, Chapter2, Section3.1, 3.2, 3.3.3, 3.4.3, 4.2,
4.5.2, 5.3
Mar., 2003 IB(NA)-66819-D
Correction
SAFETY PRECAUTIONS, Section3.1, 3.2, 5.3, Appendix1
July, 2003 IB(NA)-66819-E
Correction
Section5.3
Addition
Appendix3
Oct., 2004 IB(NA)-66819-F
Correction
SAFETY PRECAUTIONS, Section 4.5.2
June, 2005 IB(NA)-66819-G
Addition
Conformation to the EMC Directive and Low Voltage Instruction
Correction
SAFETY PRECAUTIONS, Chapter 5
Sep.,2006 IB(NA)-66819-H
Correction
SAFETY PRECAUTIONS,
Jul.,2007 IB(NA)-66819-I
Correction
Section4.4, Section4.5.2, Appendix2
Japanese Manual Version SH-3642-J
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

A - 4 A - 4
INTRODUCTION
Thank you for purchasing the Mitsubishi Graphic Operation Terminal.
Before using the equipment, please read this manual carefully to develop full familiarity with the functions
and performance of the graphic operation terminal you have purchased, so as to ensure correct use.
Please forward a copy of this manual to the end user.
CONTENTS
1 OVERVIEW 1 - 1 to 1 - 3
1.1 Features ................................................................................................................................................. 1 - 2
1.2 Comparison with A1S63ADA................................................................................................................. 1 - 3
2 SYSTEM CONFIGURATION 2 - 1 to 2- 2
3 SPECIFICATION 3 - 1 to 3 -13
3.1 General Specification............................................................................................................................. 3 - 1
3.2 Performance Specifications ................................................................................................................... 3 - 2
3.3 D/A Conversion I/O Characteristics....................................................................................................... 3 - 4
3.3.1 Voltage output characteristic........................................................................................................... 3 - 5
3.3.2 Current output characteristic........................................................................................................... 3 - 6
3.3.3 Overall accuracy.............................................................................................................................. 3 - 7
3.4 A/D Conversion I/O Characteristic ........................................................................................................ 3 - 8
3.4.1 Voltage input characteristic............................................................................................................. 3 - 9
3.4.2 Current input characteristic ............................................................................................................ 3 - 10
3.4.3 Overall accuracy............................................................................................................................. 3 - 11
3.5 I/O Signals Against the PLC CPU ........................................................................................................ 3 - 12
3.5.1 List of I/O signals ............................................................................................................................ 3 - 12
3.5.2 I/O signal functions......................................................................................................................... 3 - 13
4 PROCEDURES AND SETTINGS BEFORE OPERATION 4 - 1 to 4 -12
4.1 Procedures before Operation ................................................................................................................ 4 - 1
4.2 Handling Precautions............................................................................................................................. 4 - 2
4.3 Installation and Removal of the Shield Cover ....................................................................................... 4 - 3
4.4 Part Identification and Settings .............................................................................................................. 4 - 4
4.5 Wiring...................................................................................................................................................... 4 - 7
4.5.1 Precautions when wiring ................................................................................................................. 4 - 7
4.5.2 Wiring between the A1S66ADA and the external devices ............................................................ 4 - 8
4.6 Fine Adjustment of the Offset /Gain Values......................................................................................... 4 - 10
4.6.1 Fine adjustment methods of the offset/gain values ...................................................................... 4 - 10
4.7 Maintenance and Inspection................................................................................................................. 4 - 12

A - 5 A - 5
5 PROGRAMMING 5 - 1 to 5 - 4
5.1 Program Creation Procedures............................................................................................................... 5 - 1
5.1.1 Outputting digital values as voltage/current (D/A conversion)....................................................... 5 - 1
5.1.2 Receiving voltage/current as digital values (A/D conversion) ....................................................... 5 - 1
5.2 Basic Read and Write Programs ........................................................................................................... 5 - 2
5.3 Program Example .................................................................................................................................. 5 - 3
6 TROUBLESHOOTING 6 - 1 to 6- 2
APPENDIX App - 1 to App - 5
Appendix 1 Comparison with the Conventional Analog I/O Module (A1S63ADA) ................................App - 1
Appendix 2 External Dimensions.............................................................................................................App - 3
Appendix 3 Precautions For Reading A Digital Output Value (For Hardware Version "C" or Earlier) ...App - 4

A - 6 A - 6
Conformance to the EMC Directive/Low Voltage Directive
When incorporating the Mitsubishi PLC into other machinery or equipment and keeping compliance with
the EMC and low voltage directives, refer to Chapter 3, "EMC Directives and Low Voltage Directives" of
the User's Manual (Hardware) included with the CPU module or base unit used.
The CE logo is printed on the rating plate on the main body of the PLC that conforms to the EMC directive
and low voltage instruction.
By making this product conform to the EMC directive and low voltage instruction, it is not necessary to
make those steps individually.

1 - 1 1 - 1
MELSEC-
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1 OVERVIEW
1
1 OVERVIEW
This user's manual describes the handling, specifications and programing method of
the A1S66ADA type Analog I/O Module (hereafter referred to as A1S66ADA), which is
utilized in combination with the MELSEC-A series CPU module (hereafter referred to
as PLC CPU).The A1S66ADA is a special module with a four-channel analog input
and two-channel analog output.
(Hereinafter, D/A conversion shall mean digital to analog conversion and A/D
conversion shall mean analog to digital conversion.)
(1) D/A conversion
Digital values are converted to analog values such as voltage and current, and
output externally.
100
200
400
500
300
-100
-300
200
(V)
+
–
0
t
Digital values Analog values
(2) A/D Conversion
Analog values such as voltage and current are converted to digital values so they
can be imported into the PLC CPU.
(V)
+
–
(V)
+
–
0tt0
Digital values
Analog values
The voltage, current and digital values that the A1S66ADA may input or output
are ranged as follows:
Voltage I/O range······0 to 10 V, 1 to 5 V, -10 to 10 V, 0 to 20 mA (switched by
range)
Current I/O range······0 to 20 mA, 4 to 20 mA (switched by range)
Digital output value····0 to 4095 (12 bit binary value)
Digital input value······0 to 4000 (12 bit binary value)

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MELSEC-
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1 OVERVIEW
1
1.1 Features
(1) High-speed D/A conversion and A/D conversion are possible.
The A1S66ADA can perform conversion at high speeds, as shown below:
240 μs/2 CH or below (for D/A conversion)
400 μs/4 CH or below (for A/D conversion)
(2) High-speed sequence scan is possible
Because the reading and writing of digital and analog values is performed using
I/O signals (X/Y) instead of the buffer memory, which conventionally has been
used, the A1S66DA can reduce the sequence scan time.
Buffer memory method
TO H0 D0 K5 K1
FROM H0 K1 D1 K1
The digital value
to undergo D/A
conversion is written.
The digital value that
has been undergone
A/D conversion is read.
Processing time
Item A2USHCPU Q2ASHCPU
TO 212.1 μs 162.0 μs
Command FROM 183.5 μs 160.0 μs
Total 395.6 μs 322.0 μs
I/O signal (X/Y) format
MOV D0 K3Y0
MOV K3X0 D100
The digital value
to undergo D/A
conversion is written.
The digital value that
has been undergone
A/D conversion is read.
Processing time
Item A2USHCPU Q2ASHCPU
MOV
(D/A conversion) 0.55 μs 0.30 μs
Command MOV
(A/D conversion) 0.55 μs 0.30 μs
Total 1.10 μs 0.60 μs
(3) D/A conversion and A/D conversion may be performed with one
module.
An A1S66ADA module can perform D/A conversion at two channels and A/D
conversion at four channels.

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MELSEC-
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1 OVERVIEW
1.2 Comparison with A1S63ADA
The following is a comparison with the conventional analog I/O module (A1S63ADA).
1. Number of channels
Type A1S66ADA A1S63ADA
Output 2 channels 1 channelNumber of
channels Input 4 channels 2 channels
2. Maximum conversion speed
Type A1S66ADA A1S63ADA
D/A
conversion
240 μs/2 channels or below
(Resolution 1/4000)
Conversion speed A/D
conversion
400 μs/4 channels or below
(Resolution 1/4000)
1 μs/CH (Resolution 1/4000)
2 μs/CH (Resolution 1/8000)
3 μs/CH (Resolution 1/12000)
3. D/A conversion
A1S66ADA A1S63ADA
Type Voltage output Current output Voltage output Current output
Digital input 0 to 4000 (12 - bit binary value)
-4000 to 4000
(Resolution 1/4000)
-8000 to 8000
(Resolution 1/8000)
-12000 to 12000
(Resolution 1/12000)
0 to 4000
(Resolution 1/4000)
0 to 8000
(Resolution 1/8000)
0 to 12000
(Resolution 1/12000)
Analog output
Voltage: -10 to 10 V DC
(External load resistance 2 kΩto 1 MΩ)
Current: 0 to 20 mA DC
(External load resistance 0 Ωto 600 Ω)
Voltage: -10 to 0 to 10 V DC
(External load resistance 2 kΩto 1 MΩ)
Current: -20 to 20 mA DC
(External load resistance 0 Ωto 600 Ω)
4. A/D conversion
Type A1S66ADA A1S63ADA
Analog input
Voltage: -10 to 0 to 10 V DC
(Input resistance 1 MΩ)
Current: 0 to 20 mA DC
(Input resistance 250 Ω)
Voltage: -10 to 0 to 10 V DC (Input resistance 1 MΩ)
Current: -20 to 20 mA DC (Input resistance 250 Ω)
Digital output 0 to 4095 (12 - bit binary value)
-4096 to 4095 (Resolution 1/4000)
-8192 to 8191 (Resolution 1/8000)
-12288 to 12287 (Resolution 1/12000)
5. Accuracy
Type A1S66ADA A1S63ADA
Accuracy Within ± 1 %

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MELSEC-
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2 SYSTEM CONFIGURATION
2
2 SYSTEM CONFIGURATION
(1) Applicable CPU
· A1SCPU(S1) · A1SJCPU(S3) · A2ASCPU(S1/S30) · A2SCPU(S1) · A52GCPU(T21B)
· A1SJHCPU(S8) · A1SHCPU · A2SHCPU(S1) · A2USHCPU-S1
· Q2ASCPU(S1) · Q2ASHCPU(S1) · A1SCPU24-R2
(2) Number of modules loaded
As long as the number of I/O points for the applicable CPU is not exceeded,
there is no limit in the number of modules used.
(3) Slots for loading
The module may be loaded into any of the base module slots, expect the
following:
If the module is loaded in a slot on an extension base module that is not
equipped with a power supply module (A1S52B, A1S55B or A1S58B), the power
capacity may be insufficient to cover all the modules.
When loading to an A1S66ADA extension base module without a power supply
module, select a proper power supply module, basic base module, extension
base module and extension cable by taking the following points into
consideration:
1) Current capacity of the power supply module on the basic base module
2) Voltage drops of the basic base module
3) Voltage drops of the extension base module
4) Voltage drops in the extension cable
(4) Data link system
In a data link system, the module may be loaded to the master station, local
station or remote I/O station. Refer to the MELSECNET or MELSECNET/B Data
Link System Reference Manual for program examples for remote I/O stations.
Remark
Refer to the respective manual listed below for calculation methods for the range of
I/O points and voltage drops. This shows the system configuration when using the
graphics software to create monitor screens.
• A1SJCPU(S3) User's Manual·····························································IB(NA)-66446
• A1S/A1SC24-R2/A2SCPU(S1) User's Manual··································IB(NA)-66320
• A2ASCPU(S1/S30) User's Manual·····················································IB(NA)-66455
• A2USHCPU-S1 User's Manual···························································IB(NA)-66789
• A1SJH(S8)/A1SH/A2SHCPU(S1) User's Manual······························IB(NA)-66779
• Q2AS(H)CPU(S1) User's Manual·······················································SH(NA)-3599

2 - 2 2 - 2
MELSEC-
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2 SYSTEM CONFIGURATION
2
MEMO

3 - 1 3 - 1
MELSEC-
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3 SPECIFICATION
3
3 SPECIFICATION
This section explains the A1S66ADA the general specifications, performance
specifications and I/O signals.
3.1 General Specification
This section explains the A1SJ71PB92D general specifications.
Table 3.1 General specification
Item Specifications
Operating ambient
temperature 0 to 55 °C
Storage ambient
temperature -20 to 75 °C
Operating ambient
humidity 10 to 90 % RH, No condensation
Storage ambient
humidity 10 to 90 % RH, No condensation
Frequency Acceleration Amplitude Sweep Count
10 to 57 Hz — 0.075 mm
(0.003 in.)
When there is
intermittent
vibration 57 to 150 Hz 9.8 m/s2—
10 to 57 Hz — 0.035 mm
(0.001 in.)
Vibration
resistance
Conforming
to JIS B
3502, IEC
61131-2 When there is
continuous
vibration 57 to 150 Hz 4.9 m/s2—
10 times
each in X, Y
and Z axis
(80 minutes)
Shock resistance Conforming to JIS B3502, IEC 61131-2 (147 m/s2, 3 times each in 3 directions)
Operating
environment No corrosive gas present
Operating height 2000 m(6562 ft) or less
Installation area On the control board
Over-voltage
category 1II or less
Pollution rate 22 or less
1: Indicates the distribution area where the device is assumed to be connected, from the public power distribution network
to the local machine device.
Category II is applied to the devices to which the power is supplied from a fixed equipment.
The surge resistance voltage of a rated 300 V device is 2500 V.
2: This is an index which indicates the occurrence rate of the conductive object in the environment where the device is
used.
Pollution rate II indicates that only non-conductive pollution may occur with a possibility of generating temporary
conductivity due to accidental condensation.
3: Do not use or store the PLC under pressure higher than the atmospheric pressure of altitude 0m.
Doing so can cause a malfunction.
When using the PLC under pressure, please contact your sales representative.

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MELSEC-
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3 SPECIFICATION
3
3.2 Performance Specifications
The Table 3.2 describes the performance specifications of the A1S66ADA.
Table 3.2 Performance specification of the A1S66ADA
Item Performance specifications
— Voltage output Current output
Digital input 0 to 4000 (12-bit binary value)
Analog output -10 to 10 V DC
(External load resistance : 2 kΩto 1 MΩ)
0 to 20 mA DC
(External load resistance : 0 Ωto 600 Ω)
Analog output Analog output
Digital input 0 to 10 V
range
0 to 5 V
range
1 to 5 V
range
-10 to 10 V
range
Digital input 0 to 20 mA
range
4 to 20 mA
range
I/O characteristics 10
1000
2000
3000
4000
0 V
2.5 V
5 V
7.5 V
10 V
0 V
1.25 V
2.5 V
3.75 V
5 V
1 V
2 V
3 V
4 V
5 V
-10 V
-5 V
0 V
5 V
10 V
0
1000
2000
3000
4000
0 mA
5 mA
10 mA
15 mA
20 mA
4 mA
8 mA
12 mA
16 mA
20 mA
Maximum resolution 2.5 mV 1.25 mV 1.0 mV 5.0 mV 5 μA 4 μA
Conversion speed 2240 μs/2 channels or less (Sampling : 80 μs/1 channel)
Absolute maximum
output Voltage : ±12 V Current : +28 mA
Output short protection Present
Analog output points 2 channels
D/A conversion
Offset/gain adjustment Adjust the two channels simultaneously with the control knob on the front side of the module.
The adjustment should be done on-line.
Analog input Voltage : -10 to 0 to 10 V DC (Input resistance: 1 MΩ)
Current: 0 to 20 mA DC (Input resistance: 250 Ω)
Digital output 0 to 4095 (12-bit binary value)
Analog input (voltage) Analog input (current)
0 to 10 V
range 0 to 5 V range 1 to 5 V range -10 to10 V
range
0 to 20 mA
range
4 to 20 mA
range
Digital output
I/O characteristics 30 V
2.5 V
5 V
7.5 V
10 V
0 V
1.25 V
2.5 V
3.75 V
5 V
1 V
2 V
3 V
4 V
5 V
-10 V
-5 V
0 V
5 V
10 V
0 mA
5 mA
10 mA
15 mA
20 mA
4 mA
8 mA
12 mA
16 mA
20 mA
0
1000
2000
3000
4000
Maximum resolution 2.5 mV 1.25 mV 1.0 mV 5.0 mV 5 μA 4 μA
Conversion speed 4400 μs/4 channels or less (Sampling : 80 μs/1 channel)
Absolute maximum
input Voltage : ±15 V Current : ±30 mA
Analog input points 4 channels
D/A conversion
Offset/gain adjustment Adjust the four channels simultaneously with the control knob on the front side of the module.
Check the digital output value on-line while making the adjustments.

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MELSEC-
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3 SPECIFICATION
Table 3.2 Performance specification of the A1S66ADA (continued)
Item Performance specifications
Voltage output current output
D/A conversion
(accuracy against the
maximum value) Within ±1% (±100 mV) Within ±1% (±200 μA)
Overall
accuracy A/D conversion
(accuracy against the
scale)
Within ±1% (±40)
Insulation method Between I/O terminals and PLC power supply········Photocoupler isolation
Between each channel········No isolation
Number of occupying I/O points 64 points (Input 64 points, output 64 points) 5
Connecting terminal base 20-point terminal base (M3.5 7 screws)
Applicable wire size 0.75 to 1.25 mm2
Applicable solderless terminal R1.25 - 3 1.25 - YS3 2 - 3.5 2 - YS3A
V1.25 - M3 V1.25 -YS3A V2 - S3 V2 - YS3A
5 V DC internal current consumption 0.21 A
Voltage 21.6 to 26.4 V DC
External power
supply Current
consumption 0.16 A
Weight 0.33 kg
1 The analog output range is set commonly for CH1 to CH2.
2 The conversion speed refers to the speed between the times when a digital value is written to the
A1S66ADA and when an analog output which corresponds to the aforementioned value begins to be
outputted.
3 The analog input range is set commonly for CH3 to CH6.
4 The conversion speed refers to the speed while a change in an analog input is converted to a digital
output. (Excluding the sequence scan)
5 Inputs and outputs are assigned to the same number. Therefore, the I/O occupied points are 64.
POINT
When utilizing the peripheral device to assign the I/O numbers, set it as a 64-point
output module.

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MELSEC-
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3 SPECIFICATION
3.3 D/A Conversion I/O Characteristics
The I/O characteristic of D/A conversion will be explained below.
(1) I/O conversion characteristic
The I/O conversion characteristic refers to the angle produced by a straight line
connecting the "offset value" and "gain value" created when the digital values set
by the PLC CPU are converted to analog values (voltage or current).
(2) Offset value and gain value
Offset value and gain value are defined as follows:
(a) Offset value···The current value or voltage value that is output from the A1S66ADA
when the digital value set by the PLC CPU is "0."
(b) Gain value·····The current value or voltage value that is output from the A1S66ADA
when the digital value set by the PLC CPU is "4000."
(3) I/O conversion characteristic
Examples of A1S66ADA's I/O conversion characteristic are shown below.
(V)
10
5
0
-5
-10
Offset value
Gain value
0 2000 4000
When the offset value is -10V and gain value is 10V
Analogoutputvoltage
Digital input value
Voltage output characteristic
(mA)
10
5
0
-5
-10
Offset value
Gain value
0 2000 4000
Analogoutputcurrent
Current output characteristic
Digital input value
When the offset value is 0 mA and gain value is 20 mA

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MELSEC-
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3 SPECIFICATION
3.3.1 Voltage output characteristic
An example of voltage output characteristic graph when the offset and gain settings
are changed is shown in Fig. 3.1.
The I/O conversion characteristic when the off set
value and gain value are set, as shown in the
table below, is shown in the figure at left.
Offset value Gain value
1) 0 V 10 V
2) 0 V 5 V
3) 1 V 5 V
4) -10 V 10 V
5
0
-5
-10
10
(V)
02000 4000
Digital input value
Analogoutputvoltage
4)
2)
3)
1)
Fig. 3.1 Voltage output characteristic graph
[Example]
On the characteristic graphs 1) to 4), the analog output voltage will be as follows when
the digital input value is set to 500 and 2000:
No. Digital input value Analog output value
500 1.25 V
1) 2000 5 V
500 0.625 V
2) 2000 2.5 V
500 1.5 V
3) 2000 3 V
500 -7.5 V
4) 2000 0 V

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MELSEC-
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3 SPECIFICATION
3.3.2 Current output characteristic
An example of current output characteristic graph when the offset and gain settings are
changed is shown in Fig. 3.2.
The I/O conversion characteristic when the off set
value and gain value are set, as shown in the
table below, is shown in the figure at left.
Offset value Gain value
1) 0 mA 20 mA
2) 4 mA 20 mA
15
10
5
0
20
(m A)
02000 4000
Digital input value
Analogoutputcurrent
1)
2)
Fig. 3.2 Current output characteristic graph
[Example]
On the characteristic graphs 1) to 2), the analog output voltage will be as follows when
the digital input value is set to 1000 and 2000:
No. Digital input value Analog output value
1000 5 mA
1) 2000 10 mA
1000 8 mA
2) 2000 12 mA

3 - 7 3 - 7
MELSEC-
A
3 SPECIFICATION
3.3.3 Overall accuracy
Overall accuracy refers to the accuracy relative to the maximum analog output value.
Even if the output characteristic is altered by changing the offset/gain settings, the
overall accuracy does not change but is maintained within the performance range as
outlined in the specifications.
The overall accuracy of voltage and current output characteristics are shown in Fig. 3.3
and 3.4.
+10V
0V
-10V 0 2000 4000
Analogoutputvalue
Digital input value
Fluctuation will be within 10 V
±1% (100 mV) width due to
the operating environment
(ambient temperature, noise).
The overall accuracy of the voltage output
is the accuracy against 10V.
Fig. 3.3 Overall accuracy of voltage output characteristics
20mA
0mA0 4000
Analogoutputvalue
Di
g
ital input value
Fluctuation will be within 20 mA
±1% (200 μA) width due to
the operating environment
(ambient temperature, noise).
The overall accuracy of the current output
is the accuracy against 20 mA.
Fig. 3.4 Overall accuracy of current output characteristic