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Hitachi HIDIC EH-150 EH-PT4 Applications Manual

Resistance temperature detective input module
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HITACHI PROGRAMMABLE CONTROLLER
 
RESISTANCE TEMPERATURE DETECTIVE
INPUT MODULE(EH-PT4)
APPLICATION MANUAL
NJI-324(X)

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Summary of Contents for Hitachi HIDIC EH-150 EH-PT4

  • Page 1 HITACHI PROGRAMMABLE CONTROLLER   RESISTANCE TEMPERATURE DETECTIVE INPUT MODULE(EH-PT4) APPLICATION MANUAL NJI-324(X)
  • Page 2 Personnel who are to install and operate the equipment should carefully study this manual and any other referred to by it prior to installation and/or operation of the equipment. Hitachi Industrial Equipment Systems Co., Ltd. constantly strives to improve its products, and the equipment and the manual(s) that describe it may be different from those already in your possession.
  • Page 3 Hitachi neither assumes, nor authorizes any other person to assume for Hitachi, any other liability in connection with the sale of this PLC.
  • Page 4 Since Hitachi does not possess full access to data concerning all of the uses and applications of customer’s products, responsibility is assumed by Hitachi neither for customer product design nor for any infringement of patents or rights of others, which may result from Hitachi assistance.
  • Page 5 Safety Precautions Read this manual and related documents thoroughly before installing, operating, performing preventive maintenance or performing inspection, and be sure to use the unit correctly. Use this product after acquiring adequate knowledge of the unit, all safety information, and all cautionary information.
  • Page 6 2. About wiring REQUIRED Always perform grounding (FE terminal). If grounding is not performed, there is a risk of electric shocks and malfunctions. CAUTION Connect power supply that meets rating. If a power supply that does not meet rating is connected, fire may be caused. The wiring operation should be performed by a qualified personnel.
  • Page 7 4. About preventive maintenance DANGER Do not connect the of the battery in reverse. Also, do not charge, disassemble, heat, place in fire, or short circuit the battery. There is a risk of explosion or fire. PROHIBITED Do not disassemble or modify the unit. These actions may result in fire or malfunction.
  • Page 8 R e v i s i o n N o . C o n t e n t D a t e M a n u a l   N o .

  • Page 9: Table Of Contents

    Table of contents 1. Introduction 1-1 to 1-4 1.1 Before Use ･･････････････････････････････････････････････････････････････ 1-2 1.2 Precaution on Use ･･･････････････････････････････････････････････････････ 1-3 1.3 Features ････････････････････････････････････････････････････････････････ 1-3 1.4 Principle of Operation ･･･････････････････････････････････････････････････ 1-4 2. Structure and Nameplate 2.1 Structure and Name of Each Part ･･････････････････････････････････････････ 2-1 3.
  • Page 10 10. Example of Programming 10-1 to 10-4 10.1 Example of Programming 1 ････････････････････････････････････････････10-1 10.2 Example of Programming 2 (Offset adjustment) ･････････････････････････10-4 11. Troubleshooting 11-1 11.1 The Allocation Error “41” is indicated in CPU ･･･････････････････････････11-1 11.2 Data Error in a Specific Channel ･･･････････････････････････････････････11-1 11.3 Data Error in All Channels ････････････････････････････････････････････11-1 12.
  • Page 11 1.Introduction 1 . I n t r o d u c t i o n This manual describes how to operate the EH-PT4 (Resistance Temperature Detective input module) properly, which is one of the special function module of EH-150 Programmable Logic controller(PLC).

  • Page 12: Before Use

    1.Introduction 1 . 1 B e f o r e U s e The resistance temperature detective input module (hear after EH-PT4) has been carefully manufactured, but you are kindly advised to make the following checks on receipt of it. (1) The type and specification of the module are as specified by the order.

  • Page 13: Precaution On Use

    1.Introduction 1 . 2 P r e c a u t i o n s o n U s e (1) Before the installation and removal of the module, turn off the power. (2) Before the connection of the external wiring and removal of the terminal board, turn off the power.

  • Page 14: Structure And Nameplate

    2. Structure and Nameplate 2. Structure and Nameplate 2.1 Structure and Name of Each Part Type EH-PT4 Name and function of each part Approx. 180 g Weight Dimensions(mm) 1)  Lock Button 2)  I/O cover 4) Setting Switch 3) Terminal Block Name Function Remarks Lock button This is used when removing the module from the...

  • Page 15: Specification 3-1 To

    3.Specification 3. Specification 3.1 Specification list Table 3.1 shows the specifications of EH-PT4. Table 3.1 Specification Item Specification Type EH-PT4 Resistance temperature detective Platinum resistance temperature detective Pt100 (IEC 751) Platinum resistance temperature detective Pt1000 Temperature conversion data Signed 15 bits (In normal state the lowest bit is always “0”.) Accuracy -20 to + 40 C (Pt100)

  • Page 16: Terminal Layout And Internal Circuit

    3.Specification 3.2 Terminal layout and internal circuit Terminal layout Internal circuit Signal name ‑ PT100 IN EH-PT4 ‑ 24V DC+ 24VDC+ Internal power circui 24VDC‑ 24V DC- Note 1) Current terminals and a voltage terminals of unused channels should be wired. By this wiring read data becomes H7FFF.

  • Page 17: Block Diagram

    4. Block Diagram 4. Block Diagram 4.1 Internal Block Diagram Figure 4.1 shows the internal block diagram. EH-PT4 External wiring Line- conversion Counter arize (Note) Timing control Shielded Constant wire current External grounding circuit Each 24 V DC+ part Internal External power Power 24V DC...

  • Page 18: External Wiring

    5. External Wiring 5. External Wiring 5.1 Resistance Temperature Detective Connection Method and External Wiring × A0 to 3 : Current terminal × B0 to 3: Current terminal × b0 to 3: Voltage terminal × × × × × × External wiring(Note1) ×...

  • Page 19: Setting

    6. Setting 6. Setting 6.1 Setting of temperature range This module can be set to three temperature ranges by the dip switch shown in below. Table 6.1 Temperature rage setting Temperature Setting switch measurement range Pt100 1,2,5 ON -20 to +40 °C 1 2 3 4 5 6 7 8 Pt100 3,6 ON...

  • Page 20: Collection Of Temperature Data 7-1 To

    7. Collection of Temperature Data 7 . C o l l e c t i o n o f T e m p e r a t e D a t a 7 . 1 I / O A l l o c a t i o n The temperature data of each channel is collected in the CPU as the temperature conversion data corresponding to the temperature.

  • Page 21: Temperature Data

    7. Collection of Temperate Data 7.2 Temperature Data (1) Content of temperature conversion data [range : -50 to +400 C] (Pt100/ Pt1000) ° The meaning of the each bit( b0 to b15) of temperature conversion data (in WX**) is as shown below.
  • Page 22 7. Collection of Temperate (2) Content of temperature conversion data [range : -20 to +40 C] (Pt100) ° The meaning of the each bit( b0 to b15) of temperature conversion data (in WX**) is as shown below. The sum of the bit “1” is the measured temperature. b15 b14 b13 b12 b11 b10 b9 °...

  • Page 23: Example Of Calculation

    7. Collection of Temperate Data 7.3 Example of Calculation The program shown below as an example converts the temperature conversion data in WR0 to BCD 4 digit data in WM6. In case the temperature is minus, the bit internal output R0 will be turned on. EXT (DM000,WR0000) DM000 = DM000 S* 100 DM002 = DM000 S/ 4096...

  • Page 24: Correspondence Table Between Temperature And Temperature Data

    7.Collection of Temperature Data 7.4 Correspondence Table between Temperature and Temperature Data (1)Pt100/Pt1000 -50 to +400 ºC range Table 7.4.1 Pt100 -50 to +400 ºC range Temperature conversion data Temperature Decimal Hexadecimal Pt100 Temperature Decimal Hexadecimal Pt100 ºC data data resistance ºC data...
  • Page 25 7.Collection of Temperature Data (1)Pt100 -20 to +40℃ range T a b l e 7 . 4 . 2 P t 1 0 0 - 5 0 t o + 4 0 ºC r a n g e T e m p e r a t u r e c o n v e r s i o n d a t a Temperature Decimal Hexadecimal...

  • Page 26: Measured Temperature Range Over

    8. Error Deception Processing 8 . E r r o r D e t e c t i o n P r o c e s s i n g 8 . 1 M e a s u r e d T e m p e r a t u r e R a n g e o v e r (1)Interlock If temperate conversion data is over the measuring range or current terminal wiring is disconnected, the temperature conversion data becomes H7FFF.

  • Page 27: Treatment For Sudden Change Of Temperature Conversion Data

    8. Error Detection Processing 8 . 2 T r e a t m e n t f o r a S u d d e n C h a n g e o f T e m p e r a t u r e C o n v e r s i o n D a t a When the temperature conversion data is changed suddenly due to the disconnection of external wiring or influence of noise, the system judges it to be an abnormal condition.

  • Page 28: Installation

    9. Mounting 9 . M o u n t i n g 9 . 1 I n s t a l l a t i o n (1) EH-PT4 module can be installed on both the basic base and expansion base. (2) Precaution on installation Upon the installation of the EH-150 series, consider the operability, maintainability and environment.

  • Page 29: Precautions On External Wiring

    9. Mounting 9.4 Precautions on External Wiring Because the external wiring of the EH-PT4 handles fine signals, be sure to use a shielded wire to suppress the influence of external noise and place the wire separately from the power line and signal line of different voltage.

  • Page 30: Example Of Programming 10-1 To

    10. Example of Programming 1 0 . E x a m p l e o f P r o g r a m m i n g 1 0 . 1 E x a m p l e o f P r o g r a m m i n g 1 (1)Control contents (a) The program keeps the temperature of a liquid in a bath 10 to 12ºC higher than that of ambient air temperature.

  • Page 31: Example Of Programming 1 ････････････････････････････････････････････10-1

    10. Example of Programming (3)Program The program stores the temperature data for 4 channels in the internal DR0000 = DX0040 output. DR0002 = DX0042 Data check WM0000 = H00000 M0000 = WR0000 == H7FFF M0001 = WR0001 == H7FFF M0002 = WR0002 == H7FFF M0003 = WR0003 == H7FFF When an error is found, the program M0004 = WM0000 <>...
  • Page 32 10.Program R002 When R2 is turned on, the program (10) Y0003 = 1 turns the motor error lamp on. R001 Turn on any one of R1, R3, R4, R7 and (11) M4 to turn on the cooler and turn off Y0004 = 1 the heater.

  • Page 33: Example Of Programming 2 (Offset Adjustment) ･････････････････････････10-4

    10. Program 10.2 Example of Programming 2 (Offset adjustment) The resistance temperature detective itself has an built-in error, therefore an offset error may occur in temperature conversion data. An offset error occurs due to the change with the passage of time also.

  • Page 34: Troubleshooting

    11. Troubleshooting 11 Troubleshooting If you have some problems, please find the cause according to the following countermeasures. If the problem is not solved despite this countermeasures, contact the sales office. If a spare unit is available, replace and see the condition. 11.1 The Allocation Error “41 ”...

  • Page 35: Appendix

    Concerning the details of resistance, investigate individually for each wire. It may be slightly different from the calculated value. Reference   In the case of Hitachi twisted shielded cable (CO-DS-IREVV-SX,(10 pairs to 52)), the maximum conductor resistance in the cross section of 0.18mm under the temperature 20 C is °...

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