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4. SETTING AND PROCEDURE BEFORE OPERATION
4.4
Error Compensation by the Offset Value/Gain Value Setting
The AJ65BT-64RD error compensation is a function that compensates values at arbitrary 2 points
(offset value/gain value) within the usage temperature range at system startup or when a correct
temperature cannot be detected.
The error compensation is executed by reading the detected temperature value in the remote register
using a sequence program and monitoring the values using a peripheral device.
SW
MODE
0
NORMAL
1-4
TEST CH.
9
TEST
The following shows the characteristic of detected temperature value with respect to the input
temperature.
Compensate the detected
temperature value to equal
the input temperature.
•
The error compensation can also be done by using a standard resistor instead of inputting
temperature directly to the platinum temperature-measuring resistor.
Resistive value of standard resistor = measuring resistor against the input temperature to be the
B RATE
STATION NO.
10
1
0 1
0 1
0 1
•
•
9
PW
•
2
•
2
8
2
•
3
•
3
7
3
RUN
•
4
6
4
6
4
•
5
5
L RUN
SD
MODE OFFSET
UP
RESET
RD
SET
0 1
9
L ERR.
•
2
•
3
•
4
•
GAIN
DOWN
-50 [°C]
OFFSET
OFFSET
Lower value of the two
points to be compensated
UP/DOWN adjustment of OFFSET/GAIN
80 [°C]
79.7
Characteristics before
error compensation
Characteristics after
error compensation
0
Input temperature
-49.7
-50 [°C]
Standard resistive value of the platinum temperature-
offset value/gain value (Refer to Appendix 1).
4-5
MELSEC-A
GAIN
Higher value of the two
<
points to be compensated
(offset value more than +10C°)
GAIN
Compensate the detected
temperature value to equal
the input temperature.
80 [°C]
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