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HITACHI PROGRAMMABLE CONTROLLER
RESISTANCE TEMPERATURE DETECTIVE
INPUT MODULE(EH-PT4)
APPLICATION MANUAL
NJI-324(X)
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WARNING To ensure that the equipment described by this manual. As well as all equipment connected to and used with it, operate satisfactorily and safety, all applicable local and national codes that apply to installing and operating the equipment must be followed. Since codes can vary geographically and can change with time, it is the user’s responsibility to determine which standard and codes apply, and to comply with them. FAILURE TO COMPLY WITH APPLICABLE CODES AND STANDARDS CAN RESUL
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LIMITED WARRANTY AND IMITATION OF LIABILITY Hitachi Industrial Equipment Systems Co., Ltd. (Hitachi) warrants to the original purchaser that the programmable logic controller (PLC) manufactured by Hitachi is free from defects in material and workmanship under normal use and service. The obligation of Hitachi under this warranty shall be limited to the repair or exchange of any part or parts which may prove defective under normal use and service within eighteen (18) months from the date o
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Copyright 2002 by Hitachi Industrial Equipment Systems Co., Ltd. All Right Reserved – Printed in Japan The Information and/or drawing set forth in this document and all right in and to inventions disclosed herein and patent which might be granted thereon disclosing or employing and the materials, methods, techniques or apparatus described herein are the exclusive property of Hitachi Industrial Equipment Systems Co., Ltd . No copies of the information or drawings shall be made without the
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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. Also, make sure this manual enters the possession of the chief person in charge of safety maintenance. Safety caution items are classified as "Danger" and "Caution" in this docume
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2. About wiring REQUIRED l Always perform grounding (FE terminal). If grounding is not performed, there is a risk of electric shocks and malfunctions. CAUTION l Connect power supply that meets rating. If a power supply that does not meet rating is connected, fire may be caused. l The wiring operation should be performed by a qualified personnel. If wiring is performed incorrectly, it may result in fire, damage, or electric shock. 3. Precautions when using the unit DANGER l Do not touch the t
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4. About preventive maintenance DANGER l 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 l Do not disassemble or modify the unit. These actions may result in fire or malfunction. CAUTION l Turn off the power supply before removing or attaching module/unit. Electric shock, malfunction or failure may result.
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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 2.1 Structure and Name of Each Part 2-1 3. Specification 3-1 to 3-2 3.1 Specification list 3-1 3.2 Terminal layout and internal circuit 3-2 4. Block Diagram
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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. Appendix 12-1 12.1 Calculation of Exter
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1.Introduction 1. Introduction 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). Carefully read this manual to familiarize yourself with the procedures respectively of installation, operation, and maintenance and inspection. Please be sure to read the related application ma
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1.Introduction 1.1 Before Use 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. (2) No damage is caused to the equipment during transport. If any failures is found, contact the sales office. (3) The accessories listed
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1.Introduction 1.2 Precautions on Use (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. (3) The terminal board handles fine signals. Therefore upon handling the module or wiring, be careful not to apply a voltage on it by mistake or leave it under the influence by excessive static electricity.
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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 Weight Approx. 180 g Dimensions(mm) 30 95 4) Setting Switch 100 3) Terminal Block No. Name Function Remarks 1) Lock button This is used when removing the module from the base unit. After it is installed to the base unit, the fixation can be reinforced using screws. In this case, use M4x10mm scre
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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
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Internal current 3.Specification 3.2 Terminal layout and internal circuit Terminal layout Internal circuit No. Signal name RTD PT100 IN EH-PT4 1) b0 2) B0 3) b1 4) B1 5) b2 6) B2 7) b3 RTD 8) B3 9) 24V DC+ 10) A0 11) NC 12) A1 Internal 13) NC power 14) A2 circuit 15) NC 16) A3 17) NC 18) 24V DC- Note 1) Current terminals and a voltage terminals of unused channels should be wired. By this wiring read data beco
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Switch circuit 4. Block Diagram 4. Block Diagram 4.1 Internal Block Diagram Figure 4.1 shows the internal block diagram. EH-PT4 External wiring A0 RTD b0 V/F Line- conversion B0 Counter arize (Note) A3 RTD b3 B3 Timing control Shielded Constant wire current External grounding circuit Each 24 V DC+ part Internal External power Power 24V DC Supply 24 V DC- circuit Figure 4.1 Internal Block Diagram Note: V/F conversion re
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5. External Wiring 5. External Wiring 5.1 Resistance Temperature Detective Connection Method and External Wiring b0 A0 A0 to 3 : Current terminal B0 to 3: Current terminal B0 RTD b0 to 3: Voltage terminal NC b1 A1 B1 RTD NC b2 External wiring(Note1) A2 Use a shielded cable B2 Make a short-circuit on NC unused channel shown as the figure. b3 The temperature data A3 becomes H7FFF. B3 RTD NC +24V -24V Ground
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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 ON 1,2,5 ON -20 to +40 °C 1 2 3 4 5 6 7 8 OFF Pt100 ON 3,6 ON -50 to +400 °C OFF 1 2 3 4 5 6 7 8 Pt1000 ON 4,7 ON -50 to +400 °C 1 2 3 4 5
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7. Collection of Temperature Data 7. Collection of Temperate Data 7. 1 I/O Allocation The temperature data of each channel is collected in the CPU as the temperature conversion data corresponding to the temperature. (1) I/O assignment The I/O assignment shall be set as “WX4W" by your programming software or the peripheral equipment. (2) I/O allocation Depending on the module installation position, the temperature conversion data is
