Omron CRT1 - 10-2008 Operation Manual page 467

Analog I/O Slave Unit Functions
User Scaling
Offset Compensation
444
User scaling allows analog output values to be scaled to user-defined values.
The conversion values for 100% and 0% are set using the CX-Integrator.
Input 0 to 5 V
range
100% Set using CX-Integrator (–28,000 to 28,000)
0% Set using CX-Integrator (–28,000 to 28,000)
Discon- ---
nected
line
100% value set by user
(scaling point 2)
0% value set by user
(scaling point 1)
Note Reverse scaling, where the 0% scaling value is higher than the 100% scaling
value, is also supported.
Offset compensation is used to compensate for error that occurs during scal-
ing. The offset amount is added to the scaled line before processing, as
shown in the following diagram. The offset (error) value can be input between
28,000 and 28,000, but if underflow or overflow occurs in the scaled line, the
–
100% or 0% output will not be possible. The High Limit is 7FFE hex and the
Low Limit is 8000 hex.
Note The offset value can be set even when using default scaling.
Upper limit 7FFE hex (32766)
100% scaling value
0% scaling value
Lower limit 8000 hex (−32768)
0 to 10 V 1 to 5 V
--- 7FFF hex
Scaling value
Output conversion
0%
Cannot output 100% value
even if it is set to 7FFF.
0%
Section 11-4
–10 to 0 to
10 V 20 mA
--- --- 7FFF hex
Output signal ran
100%
Scaling line
Offset value
(–28,000 to +28,000)
Output (signal) range
100%
4 to
20 mA