Chapter1 Overview - Mitsubishi Melsec-Q Series User Manual

1
OVERVIEW
CHAPTER1
This user's manual provides the specifications, handling instructions, programming
procedures and other information of the Q68TD-G-H02 or Q68TD-G-H01 channel isolated
thermocouple input module (referred to as the Q68TD-G-H02(H01)), which is designed to
use with the MELSEC-Q series CPU module (referred to as the programmable controller
CPU).
The Q68TD-G-H02(H01) is a module designed to convert thermocouple input values from
outside the programmable controller into 16-bit signed binary measured temperature
values and 16-bit signed binary scaling values (ratios).
Programmable
controller CPU
TO
instruction
FROM
instruction
OVERVIEW
(Buffer memory)
Initial setting
Set data
Measured
temperature value
Measured
Scaling value
temperature value,
scaling value
reading
Measured
temperature value
Scaling value
Figure 1.1 Overview of Q68TD-G-H02(H01)
* Refer to Section 3.4.17 for details of the scaling values.
Q68TD-G-H02(H01)
Cold junction
temperature
compensation
channel
Channel 1
*
*
Channel 8
Resistance temperature
detector input
(by cold junction temperature
compensation resistor (RTD))
Thermocouple input
Thermocouple input
1
- 1
1
2
3
4
5
6
7
8