Omron CQM1 Operation Manual page 144

Programming and Adjustment
DM 0100 4000
DM 0101 03E8
DM 0102 019A
DM 0103 03E8
DM 0104 07FF
Output data (hexadecimal)
07FF
(20 mA)
(2) 019A
(4 mA)
0
If the following DM settings are made, the scaling as shown in the following
graph will be performed.
In this example, BCD data between 0 to 1000 will be scaled in order to output
a current of 4 to 20 mA.
Polygonal coordinate points and parameter data format
(Hexadecimal) (Refer to the Analog Output Unit Operation Manual for details.)
(Hexadecimal) (1) X axis maximum value
(Hexadecimal) (2) Y axis intersection
(Hexadecimal)
Coordinate of (3)
(Hexadecimal)
It is possible to convert data into a polygonal line as shown below. Refer to the
linear approximation description for ARITHMETIC PROCESS – APR(––) in
Section 5 of the CQM1/CPM1 Programming Manual (W228) for details.
It is not possible to use the APR instruction to obtain negative output (2's com-
plement). If required, execute the APR instruction in a positive range and con-
vert it to negative output using a program. The following is an example of a
program that converts data in a range of 0000 to 0FFF to data in a range of
8000 to 07FF.
Input condition
* "n" indicates the allocated word for analog output 1.
(3)
Value of DM 0000
(Input data)
(BCD)
1000 (1)
(03E8 hexadecimal)
25505 (> flag)
25505 (> flag)
Section 3-3
CMP(20)
#0800
APR result
ORW(35)
#F800
APR result
n
MOV(21)
APR result
n
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