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Analog I/O Terminals Section 4-8
Averaging Function
Setting (DRT1-AD04 Only)
With the DRT1-AD04, the averaging function can be enabled for all inputs (0
through 3) by turning ON pin 10 of the DIP switch. The averaging function out-
puts the average (a moving average) of the last eight input values as the con-
verted value. Use this function to smooth inputs that vary like the one in the
following diagram.
Note The time required for converted data refreshing remains 2 ms/point when the
averaging function is enabled. The first communications data after the power
is turned ON will be output after averaging eight samples.
Open-circuit Detection
Function
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 detec-
tion function is activated, the converted data is set to FFFF for the DRT1-
AD04 and 7FFF for the DRT1-AD04H. In addition, with the DRT1-AD04H, the
broken wire indicator lights when the open-circuit detection function is acti-
vated.
The open-circuit detection function is enabled or cleared at the same time as
the conversion time. If the input returns to the convertible range, the open-cir-
cuit detection is cleared automatically and the output returns to the normal
range.
Converted Data The converted data is transferred to the Master as shown in the following dia-
gram.
DRT1-AD04
Note *Not used when there are two input points. At that time only two words are
occupied.
The sign bit is turned ON to indicate that the converted value is negative; the
converted value will be the absolute value (not the two’s complement).
Time
Actual input
Input after averaging
Bit
First word
First word + 1
First word + 2
First word + 3
Sign
bit
Sign
bit
Sign
bit
Sign
bit
Input 0 converted data
Input 1 converted data
Input 2 converted data*
Input 3 converted data*
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