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8 Using Expansion Units and Expansion I/O Units
8-46
CP1E CPU Unit Hardware User’s Manual(W479)
0 to 20 mA
The hexadecimal values 0000 to 2EE0 (0 to 12000) 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 2EE0 (0 to 12000) correspond to an analog current range of 4 to
20 mA. The entire output range is 3.2 to 20.8 mA.
Averaging Function for Analog Inputs
For analog inputs, the averaging function operates when the averaging bit is set to 1. The averaging
function outputs the average (a moving average) of the last eight input values as the converted
value. If there is only a slight variation in inputs, it is handled by the averaging function as a smooth
input.
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.
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.
0 mA
20 mA
21 mA
0000 (0)
3138
(12600)
2EE0
(12000)
7FFF
8000
Conversion Data
Hexadecimal (Decimal)
4 mA
20 mA
20.8 mA
3.2 mA
3138
(12600)
2EE0
(12000)
0 mA
7FFF
FDA8
(
−
600)
8000
Conversion Data
Hexadecimal (Decimal)
Summary of Contents for CP1E-E**D Series
Page 3: ......
Page 66: ...2 Basic System Configuration and Devices 2 22 CP1E CPU Unit Hardware User s Manual W479...
Page 318: ...Appendices A 54 CP1E CPU Unit Hardware User s Manual W479...
Page 322: ...Index 4 CP1E CPU Unit Hardware User s Manual W479...
Page 324: ...Revision 2 CP1E CPU Unit Hardware User s Manual W479...
Page 325: ......