Scaling Function (Cs1W-Ad161 Only); Adjusting Offset And Gain; Adjustment Mode Operational Flow - Omron CS1W-AD041-V1 Operation Manual

Adjusting Offset and Gain

2-6-6

Scaling Function (CS1W-AD161 Only)

Overview
2-7 Adjusting Offset and Gain
2-7-1

Adjustment Mode Operational Flow

60
In the following example, the conversion value is read only if there is no dis-
connection at analog input number 1. (The unit number is 0.)
200901
With the CS1W-AD161, the scaling function can be used to convert data into
engineering units after A/D conversion. The scaling function can only be used
when the resolution is set to 4,000. Scaling is not supported for resolutions of
8,000.
When using a resolution of 4,000, A/D conversion data in the ranges 1 to 5 V,
0 to 5 V, 0 to 10 V, or 4 to 20 mA will be scaled to values between 0 and 4,000
(BCD), approximately. A/D conversion data in the range − 10 to +10 V will be
scaled to values between − 2,000 and +2,000 (BCD), approximately. (Actual D/
A conversion is executed up to − 5% to +105% of full scale.)
The lower limit and upper limit can be set to between − 32000 and +32000
(BCD). Actual settings in DM word m+20 to DM word m+51 are set in 4-digit
hexadecimal. (In the above example, the lower limit is 0000 and the upper
limit is 2710 hexadecimal.)
• Besides upper limit and lower limit. (Reverse scaling is supported.)
• Negative values are set as two's complement
• Scaling is not performed when the upper limit and lower limit are both set
to 0000 (default setting).
The adjustment mode enables the input of the connected devices to be cali-
brated.
The offset voltage (or current) and gain voltage (or current) at the output
device are entered as analog input conversion data 0000 and 0FA0 (07D0 if
the range is ± 10 V) respectively for a resolution of 4,000.
For example, when using in the range 1 to 5 V, the actual output may be in the
range 0.8 to 4.8 V, even though the specifications range for the external
device is 1 to 5 V. In this case, when an offset voltage of 0.8 V is output at the
external device, the conversion data at the Analog Input Unit for a resolution
of 4,000 will be FF38, and if a gain voltage of 4.8 V is output, the conversion
data will be 0EDA. The offset/gain adjustment function will, for this example,
convert 0.8 V and 4.8 V to 0000 and 0FA0 respectively and not to FF38 and
0EDA, as illustrated in the following table.
Offset/gain voltage at the
output device
0.8 V
4.8 V
Conversion data before
adjustment
FF38 (FE70)
0EDA (0DB4)
(Values in parentheses are for a resolution of 8,000.)
Section 2-7
The conver-
MOV (021)
sion value in
2001
CIO word
2001 (input
D00001
number 1) is
read to
D00001.
Conversion data after
adjustment
0000 (0000)
0FA0 (1F40)