Hitachi MICRO-EHV+ OBV-AIG User manual

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NJI-669(X)
OBV-AIG / AIOG / RTD
Option board Safety Precautions
Thank you for purchasing a Hitachi Programmable Logic Controller.
To operate it safely, please read this instruction manual and all the user manuals carefully. Please be sure to
use the latest versions of user manuals and keep them at hand of end users for future reference.
Caution
1. All rights reserved.
2. The content of this manual may be changed without
notice.
3. While efforts have been made on this manual to be
accurate, please contact us if any mistakes or
unclear part is found.
Warranty period and coverage
The warranty period is either 18 months after
manufacturing date (MFG. No.) or 12 months after
installation.
Examination and repair within the warranty period is
covered. However within the warranty period, the warranty
will be void if the fault is due to ;
(1) Incorrect use from instructed in this manual and the
application manual.
(2) Malfunction or failure of external other devices than
this unit.
(3) Attempted repair by unauthorized personnel.
(4) Natural disasters.
The warranty is for the PLC only, any damage caused to third
party equipment by malfunction of the PLC is not covered by
the warranty.
Repair
Any examination or repair after the warranty period is not
covered. And within the warranty period any repair and
examination which results in information showing the fault
was caused by any of the items mentioned above, the repair
and examination cost are not covered. If you have any
questions regarding the warranty or repair cost, please
contact your supplier or the local Hitachi Distributor.
(Depending on failure part, repair might be impossible.)
Ordering spare parts and inquiries
Please contact your local suppliers for ordering
products/spare parts or any inquiries with providing the
following information.
(1) Product name
(2) Manufacturing number (MFG. No.)
(3) Details of failure
Definitions and Symbols
!
DANGER
Identifies information about practice
or circumstances, which may lead to
personal injury or death, property
damage, or economic loss.
!
CAUTION
Identifies information about practice
or circumstances, which may lead to
personal injury, property damage, or
economic loss.
Safety precautions
DANGER
- Do not touch terminals while power is ON. There is a risk
of electric shock and/or injury.
- Appropriate emergency stop circuit, interlock circuitry
and similar safety measures should be added to the PLC
system to ensure safety in the event of incorrect, missing
or abnormal signals caused by broken signal lines,
momentary power interruptions or other causes.
CAUTION
- Always use the power supply voltage listed in
specifications. Using other voltage may damage the
equipment or present a risk of fire.
- The wiring operation should be performed by a qualified
personnel. Failure to do so could result in fire, damage
or electric shock.
COMPULSION
- The PLC must be grounded. Failure to do so could result
in injury to personnel or causing it to malfunction.
PROHIBITION
- Do not attempt to disassemble, repair or modify any
part of the PLC. Electric shock, malfunction or failure
may result.
- Do not connect or disconnect cable unless power has
been switched off or the area is known to be Non-
Hazardous. (This unit is not industrial control equipment
for use in hazardous locations "class I, Division2, Groups
A,B,C,D")
CAUTION
- DO NOT CONNECT DIRECTLY TO LINE VOLTAGE.
LINE VOLTAGE MUST BE SUPPLIED BY A SUITABLE,
APPROVED ISOLATING TRANSFORMER HAVING
SHORT CIRCUIT CAPACITY NOT EXCEEDING 150VA
MAXIMUM.
MISE EN GARDE
- NE PAS CONNECTER DIRECTEMENT A LA TENSION
D'ALIMENTATION.CELLE-CI DOIT ETRE FOURNIE
PAR UN TRANSFORMATEUR D'ISOLATION
POSSEDANT UNE CAPACITE DE COURT-CIRCUIT
N'EXCEDANT PAS 150 VA.
Common precautions
-Use proper cable ferrules for terminals. Using improper
cable ferrules or connecting bare wires to terminals
directly might result in fire.
-Do not turn on power, if the unit appears damaged.
-Be sure to check all field wiring before PLC power on.
Otherwise, there is a risk of fire.
-Do not cover vent holes of the housing.
-Do not pull on cables or bend cables beyond their natural
limit. Otherwise, there is a risk of breaking of wire.
-Check carefully your PLC program before operation.
-Keep PLC modules in their boxes during storage and
transport.
!
!
!
!

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NJI-669(X)
Installation environment
Avoid the following locations to install the PLC.
- Excessive dusts, salty air, or conductive materials (iron
powder, etc.)
- Direct sunlight.
- Temperature less than 0 C or more than 55 C.
- Humidity less than 5 % or more than 95 %.
- Dew condensation.
- Direct vibration or impact to the unit.
- Corrosive, explosive or combustible gases.
- Water, chemicals or oil splashing on the PLC.
- Close to noise emission devices.
Outline
These products are option board for MICRO-EHV+ series.
Although being small size, I/O circuits are isolated from
internal circuits, and these products have equivalent
performance with analog expansion unit and RTD
expansion unit. There are three models as the following
table.
Product
name
Model
name
Specifications
Analog input
option board
OBV-AIG
・4 Channels of analog input
Analog I/O
option board
OBV-AIOG
・2 Channels of analog input
・2 Channels of analog output
RTD input
option board
OBV-RTD
・4 Channels of RTD input
(2 Channels for 3-wire)
Reference Manual
Read the following application manual carefully to use the
PLC safely and properly. Be sure to keep the latest version.
Manual name
Manual
number
MICRO-EHV+ APPLICATION MANUAL
NJI-611*(X)
The postfix of the publication number is subject to change
for revision.
Installation
!
CAUTION
- Do not attach or detach an option board with power
applied to MICRO-EHV+, otherwise this could result in
damaging module or malfunction.
(1) Remove the cover A and B.
A
C
B
A
B
C
A
B
A
(2) Set DIP switches of the back side of the option board
according to “Setting of the DIP switches” of the later
page. But there is no DIP switch in OBV-RTD, so it is no
need to do for OBV-RTD.
A
DIP switches
(3) Insert an option board to a basic unit as below picture.
Insert pressing down the connector area case of an
option board.
A
C
C
(4) Attach the cover A.
Since the cover B becomes unnecessary, please keep it.
A

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NJI-669(X)
Part names and functions
(1) OBV-AIG part names and functions
Model name
OBV-AIG
Mass
0.02 kg (0.04 lb)
[Upper side] [Back side]
1) Analog input terminal
3) DIP switches
2) Connector to
basic unit
No.
Name
Details
1)
Analog input terminal
Terminals to connect analog input signals.
Cable diameter : Single wire : 0.2 mm2to 1.5 mm2
Strand wire : 0.2 mm2to 1.0 mm2
2)
Connector to basic unit
A connector is located at the back side to connect basic unit.
3)
DIP switches
DIP switches to change voltage / current mode of analog input signals.
Please set these DIP switches before insertion of the option board.
(2) OBV-AIOG part names and functions
Model name
OBV-AIOG
Mass
0.02 kg (0.04 lb)
[Upper side] [Back side]
1) Analog input / output terminal
3) DIP switches
2) Connector to
basic unit
No.
Name
Details
1)
Analog input / output terminal
Terminals to connect analog input / output signals.
Cable diameter : Single wire : 0.2 mm2to 1.5 mm2
Strand wire : 0.2 mm2to 1.0 mm2
2)
Connector to basic unit
A connector is located at the back side to connect basic unit.
3)
DIP switches
DIP switches to change voltage / current mode of analog I/O signals.
Please set these DIP switches before insertion of the option board.
Part names and functions
Part names and functions

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NJI-669(X)
(3) OBV-RTD part names and functions
Model name
OBV-RTD
Mass
0.02 kg (0.04 lb)
[Upper side] [Back side]
1) RTD input terminal
2) Connector to
basic unit
No.
Name
Details
1)
RTD input terminal
Terminals to connect RTD input signals.
Cable diameter : Single wire : 0.2 mm2to 1.5 mm2
Strand wire : 0.2 mm2to 1.0 mm2
2)
Connector to basic unit
A connector is located at the back side to connect basic unit.
Setting of the DIP switches
Voltage / current mode can be set for each channel of analog I/O. Be sure to make setting of DIP switches and setting by
the programming tool the same. In the case of not equal, the option board does not work normally.
*1: Be careful that the setting of output is reverse to it of input about voltage / current mode.
*2: All DIP switches are set voltage I/O mode at the time of shipment from factory.
Switch No.
Setting
Figure of setting
Setting items
OBV-AIG
OBV-AIOG
SW1-1
OFF
1
2
SW2
ON
SW1
1
2
ON
IN1: Voltage input
IN1: Voltage input
ON
1
2
SW2
ON
SW1
1
2
ON
IN1: Current input
IN1: Current input
SW1-2
OFF
1
2
SW2
ON
SW1
1
2
ON
IN2: Voltage input
IN2: Voltage input
ON
1
2
SW2
ON
SW1
1
2
ON
IN2: Current input
IN2: Current input
SW2-1
OFF
1
2
SW2
ON
SW1
1
2
ON
IN3: Voltage input
OUT1: Current output *1
ON
1
2
SW2
ON
SW1
1
2
ON
IN3: Current input
OUT1: Voltage output *1
SW2-2
OFF
1
2
SW2
ON
SW1
1
2
ON
IN4: Voltage input
OUT2: Current output *1
ON
1
2
SW2
ON
SW1
1
2
ON
IN4: Current input
OUT2: Voltage output *1
Part names and functions

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NJI-669(X)
Terminal layout
(1) OBV-AIG terminal layout
Terminal layout
No.
Signal
Function
Internal circuit
IN2
＋
－
IN3
＋
－
IN4
＋
－
IN1
＋
－
[Analog input]
1
2
3
4
7
8
5
6
1
IN1+
CH1 input +
Internal circuit
IN1+
IN2+
IN1-
IN2-
120 k
250 
Voltage
Current
30 k
IN4+
IN4-
120 k
30 k
······
SW1-1
SW1-2
SW2-2
······
······
Voltage
2
1
3
4
7
8
2
IN1-
CH1 input -
3
IN2+
CH2 input +
4
IN2-
CH2 input -
5
IN3+
CH3 input +
6
IN3-
CH3 input -
7
IN4+
CH4 input +
8
IN4-
CH4 input -
(2) OBV-AIOG terminal layout
Terminal layout
No.
Signal
Function
Internal circuit
IN2
＋
－
IN1
＋
－
[Analog input]
OUT1
＋
－
OUT2
＋
－
5
6
7
8
1
2
3
4
1
IN1+
CH1 input +
Internal circuit
IN1+
IN2+
IN1-
IN2-
120 k
250 
Voltage
Current
30 k
SW1-1
SW1-2
2
1
3
4
2
IN1-
CH1 input -
3
IN2+
CH2 input +
4
IN2-
CH2 input -
[Analog output]
OUT1
＋
－
OUT2
＋
－
IN2
＋
－
IN1
＋
－
2
3
4
1
7
8
5
6
5
OUT1+
CH1 output +
Internal circuit
⑤OUT1+
⑦OUT2+
⑥OUT1-
⑧OUT2-
Voltage
Current
SW2-1
SW2-2
*1
6
OUT1-
CH1 output -
7
OUT2+
CH2 output +
8
OUT2-
CH2 output -
*1 An output method of this product is the method that current flows out from this product. If current flows from
the other equipment, the error may become large by addition to output from this product. So, please confirm
input circuit of the other equipment beforehand.
Example 1) If input circuit of the other equipment is non-isolated between channels, and the sneak
current flows from other channels.
Example 2) If a pull-up resister is inserted in input of the other equipment, and current flows out from
there.
When it becomes the circuit configuration that current flows from the other equipment into this product, you
can reduce the error by putting resistor (more than 1 k) between input terminals of the other equipment.