130
8.1.4
Temperature process value (PV) scaling function
The temperature process value (PV) is scaled up or down to the value in a set range, and can be stored into the
remote register using this function. For example, the range of -100
to 100
can be scaled into the value range of 0
to 4000.
(1) Target for scaling
Although CH
Temperature process value (PV) (RWr8 to RWrB) is usually scaled, in the temperature control
mode, the values of other analog modules (such as an A/D conversion module) in the system can be also scaled
if CH
Input range (address: 100H, 130H, 160H, 190H) is set to a 200 number. (
For details, refer to the following.
This section describes the function using CH
Temperature process value (PV) (RWr8 to RWrB) as the target for scaling. To
scale an input value from other analog modules (such as an A/D converter module), read the description replacing CH
Temperature process value (PV) (RWr8 to RWrB) with CH
Temperature process value for input with another analog
module (PV) (RWw0 to RWw3).
(2) Monitoring the scaling value
The temperature process value (PV) after scaling processing is stored into the following remote register.
• CH
Process value (PV) scaling value (RWr8 to RWrB) (
The calculation method of a scaling value is as follows:
(a) Calculation example
A calculation example to scale the temperature process value (PV) into percentage is shown below.
Set the following remote buffer memory areas as below.
• CH
Input range (address: 100H, 130H, 160H, 190H): 38 (temperature measurement range -200.0
to
400.0
)
• CH
Process value (PV) scaling lower limit value (address: 201H, 204H, 207H, 20AH): 0
• CH
Process value (PV) scaling upper limit value (address: 202H, 205H, 208H, 20BH): 100
When CH
Temperature process value (PV) is 3600 (360.0
), the scaling value can be calculated as follows:
Common
=
+
(S
H
- S
L
)
(P
X
- P
Min
)
P
Max
- P
Min
S
L
: CH□ Temperature process value (PV) (RWr8 to RWrB)
: Maximum value of CH□ Input range (address: 100H, 130H, 160H, 190H)
: Minimum value of CH□ Input range (address: 100H, 130H, 160H, 190H)
: CH□ Process value (PV) scaling upper limit value (address: 202H, 205H, 208H, 20BH)
: CH□ Process value (PV) scaling lower limit value (address: 201H, 204H, 207H, 20AH)
P
Max
P
X
P
Min
S
H
S
L
CH□ Process value (PV) scaling value
(RWr8 to RWrB)
=
=
=
+
(100 - 0)
93.333
93
(The value is rounded off to an integer.)
(3600 - (-2000))
4000 - (-2000)
0
CH□ Process value (PV) scaling value
(RWr8 to RWrB)
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