Scaling Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Setting procedure
To execute the analog output test, in the GX Works3 device test, use the following procedure for setting.
1.
Set D/A conversion enable (0) in the buffer memory address 'CH1 D/A conversion enable/disable setting' (Un\G500).
2.
Turn offon 'Operating condition setting request' (Un\G70, b9).
3.
After checking that 'Operating condition setting completed flag' (Un\G69, b9) turns off, turn onoff 'Operating condition
setting request' (Un\G70, b9).
4.
In the buffer memory address 'CH1 Digital value' (Un\G460), set the digital value corresponding to the analog value to be
output.
5.
Turn offon 'CH1 Output enable/disable flag' (Un\G70, b1).

Scaling function

Performs scale conversion on digital values within the range from a scaling upper limit value to a scaling lower limit value,
both of which are set at desired values. This function helps reduce the man-hours taken for creating a scale conversion
program.
Operation
The set 'CH1 Digital value' (Un\G460) is scale converted using 'CH1 Scaling upper limit value' (Un\G504) and 'CH1 Scaling
lower limit value'(Un\G506). Then, the D/A conversion is executed using the scale converted value. (In conversion, values are
rounded off to the nearest whole number.)
If the relation between the values is the scaling lower limit value > the scaling upper limit value, the scale conversion can be
performed according to a negative slope.
Concept of scaling setting
The scaling lower and upper limit value settings depend on whether the factory setting or user range setting is used for the
analog output range.
■If the factory default is used for the analog output range
• For the scaling upper limit value, set the value corresponding to the upper limit value of the analog output value in the
currently set output range.
• For the scaling lower limit value, set the value corresponding to the lower limit value of the analog output value in the
currently set output range.
■If the user range is set for the analog output range
• For the scaling upper limit, set the value corresponding to the gain value.
• For the scaling lower limit, set the value corresponding to the offset value.
Calculating the scaling value
For D/A conversion, use the value converted based on the following formula.
■If the factory default is used for the output range
• If voltage: 1 to 5, 0 to 5, or 0 to 10 V
Current: 4 to 20 or 0 to 20 mA
Digital value used for D/A conversion =
• If voltage: -10 to 10 V
Digital value used for D/A conversion =
32000
× (D - S )
X L
S - S
H L
64000
× (D - S ) - 32000
X L
S - S
H L
2
2 FX5-4DA
189
2.4 Functions