LSIS XBF-AD08A

Chapter 13 Analog Input Module (XBF-AD04C)
13.6 Functions of Analog Input Module
Functions of XBF-AD04C conversion module are as described below.
Function
Description
Channel Run/Stop
setting
● Specify Run/Stop of the channel to execute A/D conversion.
● If the unused channel is set to Stop, whole Run time can be reduced.
Input voltage/current
range setting
● Specify analog input range to be used.
● Select range in parameter setting after select Voltage/Current switch.
● Analog input module provides two kinds of current input ranges (4~20mA,
0~20mA) and four kinds of voltage input ranges (1~5V, 0~5V, 0~10V,10~10V)
Output data format
setting
● Specify digital output type.
● 4 output data formats are provided in this module.
(Unsigned value, Signed value, Precise value, Percentile value)
A/D conversion
methods
● Sampling processing
- Sampling process will be performed if A/D conversion type is not specified.
● Filter processing
- Used to delay the sudden change of input value.
● Average processing
- Outputs average A/D conversion value based on frequency or time.
● Detection alarm
- After detecting whether disconnection of the input circuit, the alarm is
displayed by a single flag.
(Input signal range : 4 ~ 20㎃, 1 ~ 5 V)
● Maintenance function of valid conversion value.
- When valid conversion value is exceeded, whether conversion value
retains will be able to set.
● Alarm function
- When exceeding valid input range, alarm and maximum /minimum flag
will be generated.
13.6.1 Sampling processing
It collects analog input sign through general A/D conversion processing at a specific interval
to convert to digital. The time required for A/D conversion of analog input sign till saved on the
memory depends on the number of channels used.
(Processing time) = (Number of channels used) X (Conversion speed)
(Ex.) If the number of channels used is 3, its process time will be
3 x 1 ㎳ = 3 ㎳
Sampling is to calculate the sampling value of continuous analog sign at a specific interval.
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