Scaling Function - Mitsubishi MELSEC-Q series User Manual

3
SPECIFICATIONS
3.2.5
The digital input value range can be changed to any given range between -32000 and
32000.
To use this function, the following settings are required for each channel.
The CH
(Refer to (1) and (2) below.)
(1) When using the factory default setting for the output range
[Example] When the output range is "0 to 5V" or "1 to 5V"
Analog output value (V)
5
1
0
Scaling lower
limit value
3
- 18 3.2 Function List

3.2.5 Scaling function

Scaling function
• Enable the scaling function: Scaling enable/disable setting (Un\G53)
• Set the scaling upper and lower limit values: Scaling upper/lower limit value
(Un\G54 to Un\G65)
scaling upper/lower limit value settings vary depending on the output range.
(a) As the scaling upper and lower limit values, set digital values equivalent to the
upper and lower limit values of analog output respectively.
Digital input value
Scaling upper
limit value
(b) The D/A conversion uses values calculated from the following formula.
Digital values actually used
for D/A conversion
D : Digital input value
X
D : Maximum digital input value of the output range used
Max
D : Minimum digital input value of the output range used
Min
S : Scaling upper limit value
H
S : Scaling lower limit value
L
[Example]
When a digital input value of 7000 is input under the following setting:
Output range: -10 to 10V, High resolution mode,
Scaling upper limit value: 14000, Scaling lower limit value: 2000
Digital values actually used for D/A conversion
16000-(-16000)
=
14000-2000
= -2666.66
= -2666
Fractional part is rounded down.
[Example] When the output range is "-10 to 10V"
Analog output value (V)
10
0
-10
Scaling lower
limit value
D D
Max- Min
= (D -S )+D
X L
S S
H- L
(7000-2000) + (-16000)
Digital input value
Scaling upper
limit value
Min