Mitsubishi Electric Q66DA-G, User Manual

Page: 39 / 190

3
SPECIFICATIONS
3.2 Function List
3.2.5 Scaling function
3
- 16
1
OV
E
R
VI
EW
2
SYSTE
M
CO
N
F
IG
UR
A
T
IO
N
3
S
P
E
CI
F
ICA
T
IO
N
S
4
SE
T
U
P
AN
D
PR
OCE
D
U
R
ES
B
E
FOR
E
OP
ER
A
T
ION
5
UT
ILI
T
Y
P
ACK
AGE
(G
X CO
NFI
G
U
R
A
T
O
R
-
DA
)
6
PROGRAMMING
7
ON
LI
N
E M
O
D
U
LE
CHANGE
8
T
R
OU
B
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H
O
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IN
G
3.2.5 Scaling function
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.
• Enable the scaling function: Scaling enable/disable setting (Un\G53)
• Set the scaling upper and lower limit values: CH Scaling upper/lower limit
value (Un\G54 to Un\G65)
CH Scaling upper/lower limit value setting vary depending on the output range. (Refer to
(1) and (2) below.)
(1) When using the factory default setting for 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.
(b) The D/A conversion uses values calculated from the following formula.
D
X
: Digital input value
D
Max
: Maximum digital input value of the output range used
D
Min
: Minimum digital input value of the output range used
S
H
: Scaling upper limit value
S
L
: Scaling lower limit value
[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
[Example] When the output range is “0 to 5V” or “1 to 5V” [Example] When the output range is “-10 to 10V”
0
1
5
Digital input value
Analog output value (V)
Scaling lower
limit value Scaling upper
limit value
-10
0
10
Digital input value
Analog output value (V)
Scaling lower
limit value Scaling upper
limit value
Digital values actually used
for D/A conversion
D
Max-
D
Min
S
H-
S
L
(D
X
-S
L
)+D
Min
=
=
Digital values actually used for D/A conversion
= -2666.66
= -2666
Fractional part is rounded down.
16000-(-16000)
14000-2000
(7000-2000) + (-16000)