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HITACHI PROGRAMMABLE CONTROLLER RESISTANCE TEMPERATURE DETECTIVE INPUT MODULE(EH-PT4) APPLICATION MANUAL NJI- 324(X).
WARNING To ensure that the equipment described by this manual. As well as all equipment connected to and used with it, operate satisf actorily and safety, all applicable local and national codes that apply to installing and operating the equipment must be followed.
LIMITED WARRANTY AND IMITATION OF LIABILITY Hitachi Industrial Equipment Syst ems Co., Ltd. (Hitachi) warrant s to the original purchaser that the programmable logic controller (PLC) manuf actured by Hitachi is free from defects in material and workmanship under normal use and serv ice.
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 di.
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.
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.
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.
Revision No. Content Date Manual No..
Table of c ontent s 1. Introduction 1-1 to 1-4 1.1 Before Use ･･････････････････････････････････････････････････････････････ 1-2 1.
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.
1.Introduction 1- 1 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).
1.Introduction 1- 2 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.
1.Introduction 1- 3 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.
2. Structure and Nameplate 2-1 2. Structure and Nameplate 2.1 Structure and Name of Each Part Name and function of each part Type EH-PT4 Weight Approx. 180 g Dimensions(mm) No. Name Function Remarks 1) Lock button This is used when removing the module from the base unit.
3.Specification 3- 1 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 Plati.
3.Specification 3- 2 3.2 Terminal layout and internal circuit Terminal layout Internal circuit No. Signal name 1) b0 2) B0 3) b1 4) B1 5) b2 6) B2 7) b3 8) B3 9) 24V DC+ 10) A0 11) NC 12) A1 13) NC 14) A2 15) NC 16) A3 17) NC 18) 24V DC- Note 1) Current terminals and a voltage terminals of unused channels should be wired.
4. Block Diagram 4-1 4. Block Diagram 4.1 Internal Block Diagram Figure 4.1 shows the internal block diagram. Figure 4.1 Internal Block Diagram Note: V/F conversion refers to the conversion of voltage(V) to frequency(F).
5. External Wiring 5-1 5. External Wiring 5.1 Resistance Temperature Detective Connection Method and External Wiring Figure 5.1 External Wiring Note 1: The external wire length shall be less than 200 m for each channel.
6. Setting 6-1 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.
7. Collection of Temperature Data 7-1 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.
7. Collection of Temperate Data 7-2 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. The sum of the bit “ 1 ” is the measured temperature.
7. Collection of Temperate 7-3 (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.
7. Collection of Temperate Data 7-4 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.
7.Collection of Temperature Data 7-5 7.4 Correspondence Table between Temperature and Temperature Data (1)Pt100/Pt1000 -50 to +400 ºC range Table 7.4.
7.Collection of Temperature Data 7-6 (1)Pt100 -20 to +40 ℃ range Table 7.4.2 Pt100 -50 to +40 ºC range Temperature conversion data Temperature ( ºC ) Note1) Decimal data Hexadecimal data Pt100 resistance ( Ω ) -25 55296 D800 90.19 -20 57344 E000 92.
8. Error Deception Processing 8-1 8. Error Detection Processing 8.1 Measured Temperature Range over (1)Interlock If temperate conversion data is over the measuring range or current terminal wiring is disconnected, the temperature conversion data becomes H7FFF.
8. Error Detection Processing 8-2 8.2 Treatment for a Sudden Change of Temperature Conversion Data 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.
9. Mounting 9-1 9. Mounting 9.1 Installation (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.
9. Mounting 9-2 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.
10. Example of Programming 10-1 10. Example of Programming 10.1 Example of Programming 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.
10. Example of Programming 10-2 (3)Program (1) (2) (3) (4) (5) (6) (7) (8) (9) Y0000 Y0003 SS0 SS0 R003 R004 R00 2 SS0 If R0 or R1 turns on, turn the motor for a minute. However, if Y3 turns on, do not turn the motor. The program stores the difference between the temperature at the upper part of the liquid and the air temperature in WR5.
10.Program 10-3 (10) (11) (12) (13) (14) R006 R005 M004 R004 R007 R004 R003 R001 R002 Turn on either R5 or R6 to turn on the heater and turn off the cooler. Turn on M4 to light the data abnormality lamp. Turn on any one of R1, R3 and R4 to light the temperature abnormality lamp.
10. Program 10-4 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.
11. Troubleshooting 11-1 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.
12. Appendix 12-1 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 2 under the temperature 20 ° C is 121.5 ohm/km (according to Hitachi ’ s Guide Book).
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