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3 SPECIFICATIONS
3.4.17 CH
offset/gain temperature set value (buffer memory address 118 to 133: Un\G118
to 133)
Temperature detection
value is corrected to
be input temperature.
3 - 24
(1) Offset/gain setting (error compensation) is a function designed to compensate for
the value at any two points (offset value/gain value) within the operating range
when the proper temperature conversion value is not available at a system start or
when the measurement range type is changed.
(2) When the Offset Setting Request/Gin Setting Request (Y1 to 8) is turned on in the
offset/gain setting mode, the temperature conversion value is corrected to be the
temperature set value written to this area. (Setting in 0.001
[Example] To set to 0.3
(3) Error compensation is made by reading the temperature conversion values of the
buffer memory using a sequence program and monitoring the values on the
peripheral device.
(4) The following are the relationships between the temperature conversion value and
offset value/gain value relative to the input temperature.
Temperature conversion value
-50[
]
Offset value
POINT
• High accuracy is ensured for the offset and gain values when the minimum and
maximum temperatures within the operating range are used to make error
compensation.
• Make offset/gain value setting while simultaneously reading the temperature
conversion value.
• Always set the offset and gain values so that they will satisfy the following
conditions. An error will occur if the conditions are not satisfied.
Condition 1: Within temperature input range
Condition 2: Gain value - offset value > 0.1[ ]
• By giving the user range write request, the offset and gain values are stored into
2
the E
PROM of the Q64RD and will not be erased at power-off.
• Error compensation may also be made using general resistor or the like instead
of inputting a temperature directly to the temperature-measuring resistor.
Value of general resistor
..... Store 300.
80[
]
79.7
0
Input temperature
-49.7
-50[
]
Temperature-measuring resistance value of platinum
=
temperature-measuring resistor
MELSEC-Q
increments.)
Gain value
Temperature detection
value is corrected to
be input temperature.
80[
]
Characteristic before error compensation
Characteristic after error compensation
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