15-11
15 Analog I/O Function
CP1E CPU Unit Software User’s Manual(W480)
15-2 Analog Input and Output Signal Ranges
15
15-2-3 Special functions
Averaging Function for Analog Inputs
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.
Use the CX-Programmer to set the averaging function in the PLC Setup. The averaging function can
be set independently for each input.
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.
Auxiliary Area bits A434.00 to A434.01 are allocated as open-circuit detection flags.
15-2-3 Special functions
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