Hitachi EH-150 Series User manual

1 NJI-613 (X)
EH-150 series PLC HITACHI
EH-RTD8
Resistance Temperature Detective
input module
Instruction manual
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.
. 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 mistake or unclear part is
found.
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
 Warranty period and coverage
The warranty period is within 18 months after manufacturing
date (MFG NO.) or 1 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.
( ) 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.
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
 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.)
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 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
( ) Manufacturing number (MFG NO.)
(3) Details of failure
afety precautions
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 Definitions and ymbols
Indicates a potentially hazardous situation
which, if not avoided, can result in serious
injury or death.
Indicates a potentially hazardous situation
which, if not avoided, can result in minor
to moderate injury, or serious damage of
product.
: Indicates Prohibition
!
: Indicates Compulsion
DANGER
- Do not touch terminals while power ON. There is a danger of
electric shock and/or injury.
- Be sure to install external safety devices outside of the PLC
like emergency stop circuit or interlock circuit.
CAUTION
- Be sure that the rated voltage matches the power supply
voltage of the unit. Otherwise, there is a danger of breakdown
and/or injury and/or fire.
- Only qualified personnel shall carry out wiring work.
Otherwise, there is a danger of breakdown and/or injury and/or
fire.
COMPUL ION
- Be sure to ground the unit. Otherwise, there is a danger of
electric shock and/or malfunction.
PROHIBITION
- Do not attempt to modify nor disassemble the unit. There is a
danger of breakdown and/or injury and/or fire.
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 Mounting
- Mount the PLC on a metal plate and install in a cabinet as
follows.
- Be sure to ground the cabinet and the metal plate, otherwise
there is a risk of malfunction.
- Install the PLC as described in user manual.
- Take appropriate measures when the PLC system installed in
locations:
 Influenced easily due to noise or static electricity or other
forms of noise.
 Under strong electromagnetic field.
 Close to power supplies.
- Be sure to tighten mounting screws, terminal screws and
connector screws.
- Be sure to check that devices with lock mechanism, such as an
expansion cable or terminal blocks, are locked properly.
!
DANGER
CAUTION
!
!
!

2 NJI-613 (X)
Enclosure
Basic nit
Expansion nit
CP
Metal plate
Earth leakage
Breaker
Insulation transformer (recommended)
Grounding
Power
supply
AC
Grounding
Net filter
AC
AC
Figure 1 Power wiring example
Table 1 Specifications of the net filter
Item Spec.
Rated voltage (V AC) 50
Rated current (A) 5
Withstand voltage (V)
(between Terminal and case)
1,500
Insulation resistance (MΩ)
(500V DC, 1min., between terminal and case)
100 (min.)
Attenuation characteristic
(dB)
0.5 to 30 MHz Common mode
more than 40dB
0.15 to 30 MHz Differential mode
more than 40dB
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 Power Wiring
- Appropriate emergency circuitry, interlock circuitry and
similar safety measures should be added to the system.
- Appropriate safety measures should be included in the
system for unexpected breaking of wire or malsignal caused
from instantaneous power failure.
- Applied voltage must be in the range specified in the manual.
Otherwise, there is a danger of breakdown and/or injury
and/or fire.
- Install an external earth leakage breakers to avoid short
circuit accident.
- In case of the following operations, turn off power.
Otherwise, there is a danger of breakdown and/or injury
and/or fire.
 Mounting or dismounting CPU and I/O modules.
 Assembling cabinet or machine including PLC.
 Wiring.
- Install net filter specified in Table 1 or similar. The input and
output cable of the net filter should be separated as much as
possible. Be sure to ground the net filter.
- A shielded and insulated transformer is recommended.
- The basic and expansion unit should be connected to
common power source and powered up together as shown in
Figure 1.
- To install an arrester in each power wire is recommended in
order to prevent lightning damage and/or injury.
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 I/O Wiring
- Be sure that the input/output matches the specified voltage.
Otherwise, there is a danger of breakdown and/or fire.
- Use shielded cable for relay outputs modules, and connect
shields to a functional ground for one side or both sides
depending on applications.
- Route the AC power line and I/O lines separated as much as
possible. Do not route both cables in a same duct.
- Route the I/O lines and data lines as close as possible to the
grounded surfaces such as cabinet elements, metal bars and
cabinets panels.
- Refer to the following table.
Electric wire for wiring Terminal
tightening
torque
Size Material Type
-14 AWG Copper Single/twisted wire available 9in. –1bs
(1.0 Nm)
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 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 the field wiring before PLC power on.
Otherwise, there is a risk of fire.
- Do not attempt to disassemble, repair or modify any part of the
PLC.
- Do not pull on cables or bend cables beyond their natural limit.
Otherwise, there is a risk of breaking of wire.
- Keep PLC modules in their boxes during storage and transport.
- Check carefully your PLC program before operation.
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.
Reference Manual
Read the following application manual carefully depends on
series to use the PLC safely and properly. Be sure to keep the
latest version.
Manual name Manual No.
EHV-CPU APPLICATION MANUAL NJI-481* (X)
EHV-150 APPLICATION MANUAL NJI- 81* (X)
* The alphabet between 481 and (X) means version (A, B...) and
the space means the first edition.

3 NJI-613 (X)
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 General specifications
Item Specifications
Operating ambient temperature 0 to 55°C
Storage ambient temperature -10 to 75°C
Operating ambient humidity 5 to 95 % RH (no condensation)
Storage ambient humidity 5 to 95 % RH (no condensation)
Vibration resistance Conforms to IEC 60068- -6
Noise resistance ○ Noise voltage 1,500 Vpp Noise pulse width 100 ns, 1µs
(Noise created by the noise simulator is applied across the power supply module’s input terminals. This is
determined by this company’s measuring method.)
○ Based on IEC61131-
○ Static noise: 3,000 V at metal exposed area
Insulation resistance 0 MΩ or more between the AC external terminal and case ground (FE) terminal (based on 500 V DC)
Dielectric withstand voltage 1,500 V AC for 1 minute between the AC external terminal and case ground (FE) terminal
Grounding Class D grounding (ground with power supply module)
Usage environment No corrosive gases, no excessive dust
Structure Open, wall-mount type
Cooling Natural air cooling
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 Performance specification
Item Specification
Type EH-RTD8
Supported RTD type PT100 / PT1000 (3-wire or -wire)
Number of channel
Selectable by the DIP switch 6 (3-wire) or 8 ( -wire)
Temperature range
Selectable by the DIP switch - 00 to 850°C or -40 to 60°C
Resolution
Selectable by the DIP switch
○
C conversion
○
F conversion PT4 compatible
- 00 to 850
○
C : 0.1°C -3 8 to 156
○
F : 0.1
○
F -60 to 410
○
C : 15 bits
-40 to 60
○
C : 0.0 °C － - 5 to 45
○
C : 15 bits
Conversion time
Selectable by the DIP switch 1.6s (all channels) or 0.5s (all channels)
Accuracy *1 Standard accuracy ( 5
○
C) Max. ±0.5°C (measured temperature under 380°C)
Max. ±0.8°C (measured temperature over 380°C)
Temperature coefficient ±0.01% /
○
C (FS)* (±0.1°C / °C )
Measurement current 0.18mA
Diagnostic error LED LED blinking at error channel
(Wire breaking detection) Conversion value H7FFF
Input filter
Selectable by the DIP switch None or moving average 16 times
Warm-up time *3 1 minute
Isolation Channel to internal circuit Photo coupler
Between channels Not isolated
Weight Approximately 0.15 kg
External wiring Removable terminal (M3)
Internal current consumption (5 V DC) Max. 300mA
External power None
Wiring Twisted shield cable, wiring resistance Max. 5Ω (Max. 100m of AWG)
I/O assignment Selectable by the DIP switch X8W or X4W (PT4 compatible mode)
*1 Example : Measuring under 380°C in ambient temperature 35°C.(under noise-free environment)
0.5°C (standard accuracy) + 0.1°C/°C (temperature coefficient) × 10 (difference to 5°C) = ±1.5°C
* Full scale is - 00 to 850°C.
*3 It is the time for data to be stable after power on.
pecifications

4 NJI-613 (X)
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 Name and function of each part
Name and function of each part Model name EH-RTD8
Weight Approx. 0.15 kg
Consumption current
Approx. 300 mA
Dimensions (mm (in.))
30
(1.18)
100 (3.94)
95 (3.74)
No. Name Function Remarks
1] Lock button Press this button to dismount. Module can be fixed firmly by a screw of
M4 × 10 mm (0.39 in.).
] I/O cover This is the cover attached to the terminal block area.
3] Terminal This is the terminal block for connecting input signals. The terminal block is
removable.
4] Mode setting DIP switch These switches are to set wiring type, temperature range, input filter,
conversion time, temperature unit, EH-PT4 compatible mode and sensor
type.
Refer to Mode setting DIP
switch.
5] LED display The status of module and input signal are indicated in this LED.
OK : Green : Normal status
W : Green : -wire mode Off : 3-wire mode
AMB : Green : -40 to 60
○
C mode Off : - 00 to 850
○
C mode
HS : Green : High speed conversion time (0.5s)
Off : Normal conversion time (1.6s)
0 to 7 : Blinking red : Open-wire or out-of-range is detected in
corresponding channel number (0.5s cycle)
Refer to Mode setting DIP
switch.
Item Detail explanation Remarks
Explanation of operation The module receives input signals from outside.
The CPU module verifies the status of the installed module and if the I/O
assignment information matches that contained in the user program, the input
information is received according to the contents of the user program.
Terminal block The screws for the terminal block are M3 screws. Use a crimp terminal that fits the
screw diameter. The maximum thickness of the cable should be only up to 0.75
mm
. (Use 0.5 mm cable when two crimp terminals are attached to the same
terminal.)
The recommended crimp terminal is indicated below.
6
6
nit : mm
Handle very carefully since
cable could be detached
when screw is loose.
(Recommended)
4] Mode setting DIP switch
5] LED display
] I/O cover
3] Terminal
1] Lock button

5 NJI-613 (X)
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 Terminal layout and internal circuit
Terminal layout Internal circuit
No. Signal name
2-wire 3-wire
① A0 A0
② A1 b0
③ B ･B3 B1
④ A4 A
⑤ A5 b
⑥ B6･B7 B3
⑦ NC A4
⑧ NC b4
⑨ NC B5
⑩ B0･B1 B0
⑪ A A1
⑫ A3 b1
⑬ B4･B5 B
⑭ A6 A3
⑮ A7 b3
⑯ NC B4
⑰ NC A5
⑱ NC b5
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 Mode setting DIP switch
Please set the DIP switch before use. If change the DIP switch while power on, the setting is same as before.
[ Black part is factory setting ]
No. Setting Function
SW1-1 1 Wiring type
OFF 3-wire
ON -wire
SW1- Temperature range
OFF - 00 to 850
○
C,
○
F conversion: -3 8 to 156
○
F, EH-PT4 compatible:-60 to 410
○
C
ON -40 to 60
○
C,
○
F conversion: -3 8 to 156
○
F , EH-PT4 compatible: - 5 to 45
○
C
SW1-3 3 Input filter
OFF None
ON 16 times moving average
SW1-4 4 Conversion time
OFF 1.6s
ON 0.5s
SW1-5 5 Temperature unit
OFF
○
C
ON
○
F
SW1-6 6 EH-PT4 compatible mode
OFF Disable
ON Enable
SW1-7 7 For system use
OFF Set always OFF
SW1-8 8 For system use
OFF Set always OFF
SW 9 Sensor type
OFF Pt1000
ON Pt100
A0
b0
B0
A0
A1
B0・1
A5
b5
B5
Internal circuit
A6
A7
B6・7
①
②
③
④
⑤
⑥
⑦
⑧
⑨
⑩
⑪
⑫
⑬
⑭
⑮
⑯
⑰
⑱
OK 2W AMB H
0 1 2 3
4 5 6 7
PT INP T EH-RTD8

6 NJI-613 (X)
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 Conversion table
Range Input
○
C conversion
○
F conversion PT4 compatible Remarks
- 00 to 850
○
C
Under - 00
○
C
-3 768
(H8000)
-3 768
(H8000)
H7FFF
- 00
○
C - 000 -3 80 H7FFF Measurement minimum
-60
○
C -600 -760 HF666 PT4 range minimum
0
○
C 0 3 0 H0000
410
○
C 4100 7700 H4199 PT4 range maximum
850
○
C 8500 156 0 H7FFF Measurement maximum
Over 850
○
C
3 767
(H7FFF)
3 767
(H7FFF)
H7FFF
Range Input
○
C conversion
○
F conversion PT4 compatible Remarks
-40 to 60
○
C
Under -40
○
C
-3 768
(H8000)
*1
H7FFF
-40
○
C -4000 H7FFF Measurement minimum
- 5
○
C - 500 HD800 PT4 range minimum
0
○
C 0 H0000
45
○
C 4500 H4800 PT4 range maximum
60
○
C 6000 H7FFF Measurement maximum
Over 60
○
C
3 767
(H7FFF)
H7FFF
*1: Same as - 00 to 850
○
C.
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 I/O assignment and I/O addresses
The I/O assignment of EH-RTD8 is X8W. If EH-PT4 data compatible mode is enabled, it is X4W, which is same as EH-PT4.
Data table is listed as below.
Outside IO number CH Remarks
WX**0 CH0 data
WX**1 CH1 data
WX** CH data
WX**3 CH3 data
WX**4 CH4 data When EH-PT4 compatible mode is enabled, data is always 0.
WX**5 CH5 data When EH-PT4 compatible mode is enabled, data is always 0.
WX**6 CH6 data When EH-PT4 compatible or 3-wire mode is enabled, data is always 0.
WX**7 CH7 data When EH-PT4 compatible or 3-wire mode is enabled, data is always 0.
■Open-wire detection and out-of-range detection
If CPU module is EHV series, open-wire detection and out-of-range detection are monitored in the data WEX**0.
WEX**0
Out-of-range detection (ON when out of the range.)
bit 7 bit 6 bit 5 bit 4 bit 3 bit bit 1 bit 0
CH7 CH6 CH5 CH4 CH3 CH CH1 CH0
Open-wire detection (ON when open-wire is detected.)
bit 15 bit 14 bit 13 bit 1 bit 11 bit 10 bit 9 bit 8
CH7 CH6 CH5 CH4 CH3 CH CH1 CH0

7 NJI-613 (X)
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
 Caution
(1) LED indication
LED Off Blinking Lighting
OK - No power supplied.
- Module error.
(Contact your local supplier.)
Module error.
(Contact your local supplier.)
Normal operation.
W 3-wire mode. - -wire mode.
AMB - 00 to 850
○
C. - -40 to 60
○
C.
HS 1.6s conversion time. - 0.5s conversion time.
0 to 7 Normal operation. - Wire is disconnected.
- Input signal is out of the range.
-
* If no sensor is connected, open-wire is detected, LED of corresponding input number is blinking. The blinking can be avoided
by short between terminals in each channel.
[Intended terminals in 3-wire input] A*, B* and b*
[Intended terminals in -wire input] A* and B*
( ) Wiring
Since analog signal is very sensitive, be sure to use shielded cable in order to protect from noise, and route the cable apart from
other power/signal cables.
Be sure to ground the shield at one end basically. But grounding at both ends or no grounding can be more effective depending
on system environment.
3-wire input
-wire input
A0 to A5
b0 to b5
RTD
(3-wire)
Grounding at the one end
Shielded
Shielded cable
(Twisted cable)
EH
-
RTD8
B0
to B5
Grounding at the one end
A0 to A7
B0 to B7
RTD
( -wire)
Shielded
Shielded cable
(Twisted cable)
EH
-
RTD8