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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). 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 manuals, too.
Table 1.1 Reference Manual list
No. Document Manual No.
1 About the detailed operation method of the programming unit
1) Instruction word programmer (PGM-CHH)
Instruction word programmer manual
2) Portable indication programmer (PGM-GPH)
Portable indication programmer manual
3) LADDER EDITOR FOR WINDOWS (HLW-PC3)
Programming manual
4) LADDER EDITOR FOR DOS (HL-AT3E)
Programming manual
NB981X
*
NB982X
*
NJI-206X*
NB335X
*
2 EH-150 APPLICATION MANUAL NJI-280X*
“*” means revision of manual and up to A, B, C in order.
Reference
What is Resistance Temperature Detective(RTD)?
This is also called as “Resistance Thermometer Sensor”.
Refers to the device measuring the temperature by using the metal’s property that its
electric resistance changes with the temperature and is often made of Pt 100 ohm (platinum
with a resistance of 100 ohm at 0 °C.
As for the principle of the measurement, by feeding a constant current of 1 through 5 mA ( 2
mA in this module) to a resistance temperature detective, the change of resistance due to
that of temperature is measured as the change of voltage.
Use a resistance temperature detective complying with IEC 751 for this module.