8 Using Expansion Units and Expansion I/O Units
8-28
CP1E CPU Unit Hardware User’s Manual(W479)
0 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog current range of 0 to 20 mA.
The entire output range is 0 to 21 mA.
4 to 20 mA
The hexadecimal values 0000 to 1770 (0 to 6000) correspond to an analog current range of 4 to 20 mA.
The entire output range is 3.2 to 20.8 mA.
z Averaging Function for Analog Inputs
The averaging function can be enabled for inputs using the DIP switch. The averaging function out-
puts 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.
z Open-circuit Detection Function for Analog Inputs
The open-circuit detection function is activated when the input range is set to 1 to 5 V and the volt-
age 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 8,000.
The time for enabling or clearing the open-circuit detection function is the same as the time for con-
verting the data.
If the input returns to the convertible range, the open-circuit detection is cleared automatically and
the output returns to the normal range.
Other Functions
0 mA
20 mA
21 mA
0000 (0)
189C
(6300)
1770
(6000)
7FFF
8000
Conversion Data
Hexadecimal (Decimal)
4 mA
20 mA
20.8 mA
3.2 mA
189C
(6300)
1770
(6000)
0 mA
7FFF
FED4
(−300)
8000
Conversion Data
Hexadecimal (Decimal)
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