Omron CQM1 Operation Manual page 137

Functions
Current Output
118
The following graph shows the voltage output characteristics of the Analog
Output Unit.
Output voltage (V)
Note 1. If the setting pins are set to prohibit negative voltage output, no negative
voltage will be output.
2. In 2's complement, –1 is FFFF, by subtracting 1 continuously, the smallest
value will be F800.
Data between 0000 to 07FF (hexadecimal) for output from the CPU is con-
verted into a current of 0 to 20 mA and output.
Bits 11 to 14 of the output data have nothing to do with output current (i.e., 0
mA is output for 0000 and 7800 (hexadecimal)). Bit 15 must be always set to
0. If bit 15 is set to 1, the data conversion of the Analog Output Unit may take
longer.
MSB
15
These four bits have nothing to do with the output voltage.
The following graph shows the current output characteristics of the Analog
Output Unit.
Output current (mA)
10
5
F800 FC00
0
–5
–10
10 9 8 7 6 5 4
20
10
0
0000 0400
Section 2-2
0000 0400 07FF
Output data (hexadecimal)
LSB
3 2 1 0
MSB: Most significant bit
LSB: Least significant bit
07FF
Output data (hexadecimal)