Omron DRT2 SERIES DEVICENET SLAVES - OPERATION MANUAL 04-2008 Operation Manual page 359

Analog Input Terminals
Default Scaling
User Scaling
Offset Compensation
338
Analog input values (count values) are converted to the original voltage and
current values. The units used are mV or
selected, scaling is performed according to the range used, as shown in the
following table.
Input 0 to 5 V
range
100% 5,000 mV
0% 0000 mV
Off-wire ---
Analog input values (count values) are scaled to user-defined values. The
conversion values for 100% and 0% are set using the Configurator.
Input 0 to 5 V
range
100% Set using Configurator (–28,000 to 28,000)
0% Set using Configurator (–28,000 to 28,000)
Off-wire ---
Value for 100% set by user
(Scaling point 2)
Value for 0% set by user
(Scaling point 1)
Note Reverse scaling, where the 0% scaling value is higher than the 100% scaling
value, is also supported.
Scaling analog input values of linear sensors to distances produces mounting
error in the sensor. Offset compensation compensates for error that occurs
during scaling. The offset amount is added to the scaled line before process-
ing, as shown in the following diagram. The offset (error) value can be input
between 28,000 to 28,000, but make sure that underflow or overflow does
–
not occur. 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.
0 to 10 V 1 to 5 V
–
(AD04 only)
10,000 5,000 mV 10,000 mV
mV
0000 mV 1,000 mV –10,000 mV 0000
--- 7FFF hex ---
0 to 10 V 1 to 5 V
–
(AD04 only)
--- 7FFF hex ---
Scaling value
Conversion
0% 1
Section 7-4
µ
A. When default scaling is
10 to 0 to
10 V
20 mA
µ
20,000 A 20,000
µ
A 4,000
--- 7FFF hex
10 to 0 to
10 V
20 mA
--- 7FFF hex
Input signal range
00%
4 to
20 mA
µ
A
µ
A
4 to
20 mA