Ch Scaling Value (Un\G50 To 53) - Mitsubishi Electric Q64RD User Manual

3 SPECIFICATIONS
3.4.15 CH scaling value (Un\G50 to 53)
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(1) The measured temperature value within the scaling range set for the CH
range upper/lower limit values (buffer memory address 62 to 77: Un\G62 to 77) is
scaled to the scaling width set for the CH
(buffer memory address 78 to 85: Un\G78 to 85) and the result is stored.
(2) The following is how to calculate the scaling value.
Scaling value =
(Scaling width upper limit value - Scaling width lower limit value)
Measured Temperature value - Scaling range lower limit value
Scaling range upper limit value - Scaling range lower limit value
[Example]
To scale a temperature to a percent
When the CH1 measured temperature value of 360
value = 360000 (32bit) ) is scaled at the following settings:
Scaling range: -100 to 500
500000)
Scaling width: 0 to 100% (lower limit value = 0, upper limit value = 100)
Scaling value=
360000-(-100000)
(100-0)
500000-(-100000)
POINT
(1) If the upper limit value is less than the lower limit value in the settings of the CH
scaling range upper/lower limit values (buffer memory address 62 to 77:
Un\G62 to 77) or CH
address 78 to 85: Un\G78 to 85), it will not result in an error and the scaling
value will be output using the above calculation expression to make calculation.
(2) If the temperature measured is outside the range set by the upper and lower
limit values of the scaling range, the value set as the upper or lower limit value of
the scaling width is stored into the buffer memory.
scaling width upper/lower limit values
(lower limit value = -100000, upper limit value =
+0=76.666666
Fractional portion is rounded off.
=77[%]
Stored into buffer memory address 50.
scaling width upper/lower limit values (buffer memory
MELSEC-Q
scaling
+Scaling width lower limit value
measured temperature
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