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4.11 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 buffer
memory using this function. For example, the range of -100°C to 100°C can be scaled into the value range of 0 to
4000.
(1) Objects for scaling
CH Temperature process value (PV) (Un\G9 to Un\G12) is scaled in general, but setting CH Input range
(Un\G32, Un\G64, Un\G96, Un\G128) into the 200s allows scaling for the values of other analog modules (such
as A/D converter modules) on the system. ( Page 96, Section 3.4.2 (12))
For details, refer to the following.
Page 221, Section 4.16 (1)
This section describes objects for scaling as CH Temperature process value (PV) (Un\G9 to Un\G12). When scaling input
values from other analog modules (such as A/D converter modules), substitute CH Temperature process value (PV)
(Un\G9 to Un\G12) for CH Temperature process value (PV) for input with another analog module (Un\G689 to Un\G692) to
set this.
(2) Monitoring the scaling value
The temperature process value (PV) after scaling processing is stored into the following buffer memory area.
•CH Process value (PV) scaling value (Un\G728, Un\G744, Un\G760, Un\G776) ( Page 153,
Section 3.4.2 (78))
The calculation method of a scaling value is as follows:
Common
PX: CH Temperature process value (PV) (Un\G9, Un\G10, Un\G11, Un\G12)
: A maximum value of CH Input range (Un\G32, Un\G64, Un\G96, Un\G128)
: A minimum value of CH Input range (Un\G32, Un\G64, Un\G96, Un\G128)
: CH A maximum scaling value of process value (PV) (Un\G727, Un\G743, Un\G759, Un\G775)
: CH A minimum scaling value of process value (PV) (Un\G726, Un\G742, Un\G758, Un\G774)
P
Max
PMin
SH
SL
=+
(S
H - SL)(PX - PMin)
P
Max - PMin
SL
CH Process value (PV) scaling value
(Un\G728, Un\G744, Un\G760, Un\G776)