Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 203

Analog I/O Units
Averaging Function for
Analog Inputs
Open-circuit Detection
Function for Analog
Inputs
1 to 5 V
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog volt-
age range of 1 to 5 V. The entire output range is 0.8 to 5.2 V.
5.2 V
5 V
1 V
0.8 V
0 V
FED4
0000 (0)
8000
(–300)
0 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog cur-
rent range of 0 to 20 mA. The entire output range is 0 to 21 mA.
21 mA
20 mA
0000
(0)
0 mA
8000
4 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog cur-
rent range of 4 to 20 mA. The entire output range is 3.2 to 20.8 mA.
20.8 mA
20 mA
4 mA
3.2 mA
0 mA
FED4
0000 (0)
8000
(–300)
The averaging function can be enabled for inputs using the DIP switch. The
averaging function stores the average (a moving average) of the last eight input
values as the converted value. Use this function to smooth inputs that vary at a
short interval.
The open-circuit detection function is activated when the input range is set to 1 to
5 V and the voltage drops below 0.8 V, or when the input range is set to 4 to
20 mA and the current drops below 3.2 mA. When the open-circuit detection
function is activated, the converted data will be set to 8000.
Section
Conversion
Data
Hexadecimal
1770 189C
7FFF
(Decimal)
(6000) (6300)
Conversion
Data
Hexadecimal
1770 189C
7FFF
(Decimal)
(6000) (6300)
Conversion
Data
Hexadecimal
1770 189C
7FFF
(Decimal)
(6000) (6300)
3-1
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