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8 Using Expansion Units and Expansion I/O Units
8-6
CP1E CPU Unit Hardware User’s Manual(W479)
Averaging Function
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.
Use this function to smooth inputs that vary at a short interval.
Open-circuit Detection
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.
When the resolution is 1/12,000, the 0 to 20 mA
range correspond to hexadecimal values 0000 to
2EE0 (0 to 12,000). The entire data range is FDA8
to 3138 hex (-600 to 12,600). A negative voltage is
expressed as a two’s complement.
4 to 20 mA Inputs
When the resolution is 1/6,000, the 4 to 20 mA
range correspond to hexadecimal values 0000 to
1770 (0 to 6,000). The range of data that can be con-
verted is FED4 to 189C hex (-300 to 6,300). Current
in the range of 3.2 to 4 mA is expressed as a two’s
complement.
If an input is below the range (i.e., less than 3.2 mA),
the open-circuit detection function is activated and
the data becomes 8,000.
When the resolution is 1/12,000, the 4 to 20mA
range correspond to hexadecimal values 0000 to
2EE0 (0 to 12,000). The entire data range is FDA8
to 3138 hex (-600 to 12,600). Current in the range
of 3.2 to 4 mA is expressed as two's complement.
If an input is below the range (i.e., less than 3.2
mA), the open-circuit detection function is activated
and the data becomes 8,000.
0 mA
20 mA
21 mA
−
1 mA
FDA8 (
−
600)
3138 (12600)
2EE0 (12000)
0000 (0)
Converted Data
Hexadecimal (Decimal)
Converted data
Hexadecimal (Decimal)
189C (6300)
1770 (6000)
0000 (0)
FED4 (
−
300)
4 mA
20 mA 20.8 mA
3.2 mA
0 mA
4 mA
20 mA
20.8 mA
3.2 mA
FDA8 (
−
600)
3138 (12600)
2EE0 (12000)
0000 (0)
0 mA
Converted 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...
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