Chapter 2 Analog Input Module AH04AD/AH08AD
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3. Average
Digital values are averaged. The number by which the sum of several digital values is divided is
between 1 and 100. The sampled values are taken as a queue, and the length of the queue is N.
Each time a new sampled value is put at the end of the queue, an original value at the start of the
queue is removed. The N values are averaged so that the periodic noise is suppressed.
4. Scale range
The analog input mode of a channel has a corresponding digital range, that is, an analog range
corresponds to a digital range. For example, if the analog range is -10 V~10 V and the digital
range is -10.0~10.0, the analog values -10 V~10 V correspond to the digital values -10.0~10.0.
5. Disconnection detection
Only if the analog rang is 4 mA~20 mA or 1 V~5 V does the disconnection detection function. If a
module which can receive inputs ranging from 4 mA to 20 mA or from1 V to 5V is disconnected,
an input signal will exceed the range of inputs which can be received by the hardware, and the
module will give an alarm or a warning. Please refer to the description below for more
information.
6. Channel detection
If an input signal exceeds a range of inputs which can be received by hardware, an error
message appears. Please refer to section 1.2.1 for more information.
a. Giving alarms or warnings
The procedure below explains how to set a module so that it gives an alarm or a warning.
Rated input range
10.0 -10.0
Analog value
Scale range
-10 V
10 V
Digital value
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