Hitachi EH-RTD8 Instruction Manual

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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.

Safety precautions

 Definitions and Symbols

Indicates a potentially hazardous situation

DANGER

CAUTION

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

Caution

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 mistake or unclear part is found.

 Warranty period and coverage

The warranty period is within 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

: Indicates Compulsion

- 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.

- 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.

DANGER

CAUTION

COMPULSION

- Be sure to ground the unit. Otherwise, there is a danger of

electric shock and/or malfunction.

- Do not attempt to modify nor disassemble the unit. There is a

danger of breakdown and/or injury and/or fire.

PROHIBITION

 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.

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CPU

Earth leakage

Grounding

AC AC

Metal plate

Grounding

Power

supply

Breaker

Enclosure

Basic Unit

Expansion Unit

Net filter

Figure 1 Power wiring example

Table 1 Specifications of the net filter

Insulation transformer (recommended)

Item Spec.

 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

Size Material

22-14 AWG Copper Single/twisted wire available

Type

Terminal

tightening

torque

9in. –1bs (1.02 Nm)

Rated voltage (V AC) 250

Rated current (A) 5

Withstand voltage (V)

(between Terminal and case)

Insulation resistance (MΩ)

(500V DC, 1min., between terminal and case)

Attenuation characteristic

(dB)

0.5 to 30 MHz

0.15 to 30 MHz

1,500

100 (min.)

Common mode

more than 40dB

Differential mode

more than 40dB

 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.

 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

EHV-150 APPLICATION MANUAL * The alphabet between 481 and (X) means version (A, B...) and

the space means the first edition.

NJI-481* (X) NJI-281* (X)

2 NJI-613 (X)

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Specifications

 General specifications

Item Specifications

Operating ambient temperature

Storage ambient temperature

Operating ambient humidity 5 to 95 % RH (no condensation)

Storage ambient humidity 5 to 95 % RH (no condensation)

Vibration resistance Conforms to IEC 60068-2-6 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 IEC61131-2 ○ Static noise: 3,000 V at metal exposed area

Insulation resistance 20 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

 Performance specification

Item Specification

Type EH-RTD8

Supported RTD type PT100 / PT1000 (3-wire or 2-wire)

Number of channel

Selectable by the DIP switch

Temperature range

Selectable by the DIP switch

○

Resolution

Selectable by the DIP switch

Conversion time

Selectable by the DIP switch

Accuracy *1

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

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 22AWG)

I/O assignment Selectable by the DIP switch X8W or X4W (PT4 compatible mode)

Standard accuracy (25○C)

Temperature coefficient ±0.01% / ○C (FS)*2 (±0.1°C / °C )

*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 25°C) = ±1.5°C *2 Full scale is -200 to 850°C. *3 It is the time for data to be stable after power on.

C conversion

-200 to 850○C : 0.1°C -328 to 1562○F : 0.1○F -60 to 410○C : 15 bits

-40 to 60○C : 0.02°C

Max. ±0.5°C (measured temperature under 380°C)

Max. ±0.8°C (measured temperature over 380°C)

0 to 55°C

-10 to 75°C

6 (3-wire) or 8 (2-wire)

-200 to 850°C or -40 to 60°C

○

F conversion PT4 compatible

－ -25 to 45

1.6s (all channels) or 0.5s (all channels)

None or moving average 16 times

○

C : 15 bits

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(1.18)

Handle very carefully since

 Name and function of each part

Name and function of each part

1] Lock button

5] LED display

Model name EH-RTD8

Weight

Consumption current

Dimensions (mm (in.))

Approx. 0.15 kg

Approx. 300 mA

2] I/O cover

4] Mode setting DIP switch

100 (3.94)

3] Terminal

No.

1] Lock button Press this button to dismount. Module can be fixed firmly by a screw of

2] 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

4] Mode setting DIP switch These switches are to set wiring type, temperature range, input filter,

5] LED display The status of module and input signal are indicated in this LED.

Name Function Remarks

M4 × 10 mm (0.39 in.).

removable.

conversion time, temperature unit, EH-PT4 compatible mode and sensor type.

OK : Green : Normal status

2W : Green : 2-wire mode Off : 3-wire mode

AMB : Green : -40 to 60○C mode Off : -200 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)

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

. (Use 0.5 mm2 cable when two crimp terminals are attached to the same

terminal.)

The recommended crimp terminal is indicated below.

(Recommended)

95 (3.74)

Refer to Mode setting DIP switch.

Unit : mm

cable could be detached when screw is loose.

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B0 A0

②

⑬

⑰

 Terminal layout and internal circuit

Terminal layout Internal circuit

No. Signal name

2-wire 3-wire

OK 2W AMB HS 0 1 2 3

① A0 A0

4 5 6 7

② A1 b0

PT INPUT EH-RTD8

③ B2･B3

④ A4 A2

⑤ A5 b2

⑥ B6･B7

⑦ NC A4

⑧ NC b4

⑨ NC B5

⑩ B0･B1

⑪ A2 A1

⑫ A3 b1

⑬ B4･B5

⑭ A6 A3 ⑮ A7 b3

⑯ NC B4

①

⑩

⑪

③

⑫

④

⑤

⑭

⑥

⑮

⑦

⑯

⑧

⑨

⑱

B0・1

B6・7

⑰ NC A5

⑱ NC b5

 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 2-wire

SW1-2 2 Temperature range

OFF -200 to 850○C, ○F conversion: -328 to 1562○F, EH-PT4 compatible:-60 to 410○C

ON -40 to 60○C, ○F conversion: -328 to 1562○F , EH-PT4 compatible: -25 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

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

SW2 9 Sensor type

OFF Pt1000

ON Pt100

○

Internal circuit

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 Conversion table

Range Input

Under -200

-200○C

-200 to 850○C

Over 850○C

Range Input

Under -40

-40 to 60○C

Over 60○C

*1: Same as -200 to 850○C.

○

-60○C

0○C

410○C

850○C

○

-40○C

-25○C

0○C

45○C

60○C

○

C conversion

-32768

(H8000)

-2000

32767

(H7FFF)

C conversion

-32768

(H8000)

-4000

-2500

32767

(H7FFF)

-600

4100

8500

4500

6000

○

F conversion PT4 compatible Remarks

-32768

(H8000)

-3280

-760

320

7700

15620

32767

(H7FFF)

○

F conversion PT4 compatible Remarks

H7FFF

H7FFF Measurement minimum

HF666 PT4 range minimum

H0000

H4199 PT4 range maximum

H7FFF Measurement maximum

H7FFF

H7FFF Measurement minimum

HD800 PT4 range minimum

H0000

H4800 PT4 range maximum

H7FFF Measurement maximum

H7FFF

 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

WX**0 CH0 data

WX**1 CH1 data

WX**2 CH2 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.

Remarks

■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 2 bit 1 bit 0

CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0

Open-wire detection (ON when open-wire is detected.)

bit 15 bit 14 bit 13 bit 12 bit 11 bit 10 bit 9 bit 8

CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0

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A0 to A5

b0 to b5

Grounding at the one end

Shielded

EH-RTD8

to B5 Grounding at the one end

A0 to A7

B0 to B7

Shielded

EH-RTD8

 Caution

(1) LED indication

LED Off Blinking Lighting

OK - No power supplied.

- Module error. (Contact your local supplier.)

AMB

0 to 7 Normal operation. - Wire is disconnected.

3-wire mode. - 2-wire mode.

○

-200 to 850

1.6s conversion time. - 0.5s conversion time.

C. - -40 to 60○C.

Module error. (Contact your local supplier.)

- 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 2-wire input] A* and B*

(2) 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.

Normal operation.

3-wire input

2-wire input

Shielded cable

(Twisted cable)

Shielded cable

(Twisted cable)

RTD

(3-wire)

RTD

(2-wire)

7 NJI-613 (X)