XGB Analog edition manual
6.6 Functions of Analog I/O Module
The functions of XBF-AH04A Module are as follows.
Channel
● Specify operation/stop of the channel which will perform A/D and D/A conversion.
● Specifying unused channels as Stop can shorted overall operation time.
I/O Voltage /current
range setting
● Specify desired range of analog I/O.
● Select voltage/current with external switch, and set up range with parameter.
● Analog I/O Module provides 2 ranges(4~20mA, 0~20mA) of current I/O and 3 ranges
(1~5V, 0~5V, 0~10V) of voltage I/O.
I/O data type setting
● Specify digital I/O types.
● This module provides 4 output data types (Unsigned, Signed, Precision, and
A/D input conversion
method
● Sampling Process
- If A/D conversion method has not been specified, the module processes sampling.
● Filter process
- Filters rapid changes in input value by external noise.
● Averaging process
- Outputs A/D converted value averaged by time, cycle, and moving.
D/A output status
● Sets up channel output state at transition from run to stop.
●
Provides 4 output selections (Previous, Minimum, Mean, Maximum Values)
6.6.1 Sampling Process
In popular A/D conversion process, analog input signals are collected at constant time intervals
and A/D converted. The time elapsed for the analog signals converted into digital signals and
saved in memory device depends upon the number of channels used.
(Process Time) = (No. of Channels Used) x (Conversion Rate)
(Ex.) Process time when using 3 of 4 I/O channels;
3 x 1 ㎳ = 3.0 ㎳
The term ‘sampling’ means taking analog signal values at certain time intervals.
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