Hitachi HIDIC EH-150 Instruction Manual page 4

1 . Introduction
This manual describes how to operate properly the EH-PT4(Temperature detective resistance module),
which is one of the special function module of EH-150 Programmable Logic controller(PLC). Please
read carefully 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.
No.
1 About the detailed operation method of the
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
Programming manual
2 EH-150 application manual
"*" means revision of manual and up to A, B, C in order.
Reference
What is Resistance Thermometer element ?
Measurement principle is based on the property of metals, that the resistance of metals changes
linear depending on the temperature. PT100 is normally used as the metal. (The resistance of
the platinum is 100 Ω at 0 ºC)
Voltage drop of the thermometer element can be measured by supplying a constant current of 1
through 5 mA ( 2 mA in this module) to the resistance thermometer element, and therefore the
temperature can be calculated by the voltage drop.
Use a resistance thermometer element complying with IEC 751 for this module.
Table 1.1 Reference Manual list
Document
programming
1-1
1.Introduction
Manual No.
H-PE02-1
H-PE01-1
NJI-299*
NB325C
NJI-280*
*
*
*