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OVERVIEW
CHAPTER1 OVERVIEW
This user's manual provides the specifications, handling instructions, programming
procedures, and other information of the Q68RD3-G channel isolated RTD (Resistance
Temperature Detector) input module (hereinafter the "Q68RD3-G"), which is designed to
use with the MELSEC-Q series CPU module.
The Q68RD3-G is a RTD module (3-wire type) and converts temperature data [ ] input
from the Pt100 or JPt100 platinum RTDs (hereinafter the "Pt100" or "JPt100") or the Ni100
nickel RTD (hereinafter the "Ni100") to measured temperature values in 16-bit signed
binary data (stored as a value rounded off to one decimal place 10) or scaling values
(ratios (%)).
* For details on scaling values, refer to Section 3.4.15.
Q68RD3-G
Initial setting
(Buffer memory)
RTD input
Setting data
Scaling value
Scaling value
Channel 8
Channel 1
*1
*1
Temperature measurement
RTD input
Programmable controller
CPU
TO
instruction
FROM
instruction
Measured
temperature
value, scaling
value reading
Measured
temperature
value
Measured
temperature
value