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Chengdu Ebyte Electronic Technology Co., Ltd.
Chapter 4 Product function introduction
4.1AI input
4.1.1Analog range
The analog input AI measures the current signal, the acquisition range is 0-20mA or 4-20mA, the precision is
3 ‰, and the resolution is 12 bits. Single-ended input is adopted , the sampling frequency is 10Hz, and the
input impedance is 100Ω .
Set the sampling range of all AI channels, valid values are 1 and 0 (default 0).
Configured as 0: means 0~20mA
Configured as 1: means 4~20mA
[Note] AI configuration instructions
( 1) The AI sampling range of each channel can be set . When the AI channel sampling range is configured as
4-20mA sampling, if the current signal is lower than 3.5 mA is displayed as 0, and when it is higher than 3.5 mA
and lower than 4mA, it is displayed as 4 . There is no conversion limit for signals greater than 20mA, but it cannot
exceed 25mA (there will be equipment damage risk if it exceeds 25mA).
( 2) The starting address of the AI channel sampling range parameter is 0x04B2, the register type is holding
register, and the function code is 0x06, 0x10. When writing AI channel sampling range parameters, if the written
parameter value is not within the range of 0 to 1, it will automatically take the closest value and write it in. If the
sampling range parameter is 2, the device will take 1 as the sampling range parameter. And M odbus will not return
wrong command.
4.1.2 Trigger mode
( 1) Not trigger: mode off .
(2 ) Rising trigger: When the AI input value becomes greater than the set AI trigger high value, the AI trigger
is high (that is, the output state is 1), and a rising edge trigger is generated. After the trigger, as long as the AI value
is not lower than the set When the AI trigger is low, the current output value is always 1 (can be linked with DO) .
(3 ) Falling trigger: When the AI input value becomes less than the set AI trigger low value, the AI trigger is
low (that is, the output state is 0), and a falling edge trigger is generated. After the trigger, as long as the AI value is
not higher than the set When the AI trigger is at a high value, the current output value is always 0 (can be linked
with DO) .
(4 ) Bilateral trigger: When the AI input value becomes greater than the set AI trigger high value, the AI trigger
is high (that is, the output state is 1), and a rising edge trigger is generated. After the trigger, as long as the AI value
is not lower than the set When the AI trigger is low, the current output value is always 1; when the AI input value
becomes smaller than the set AI trigger low value, the AI trigger is low (that is, the output state is 0), and a falling
edge trigger is generated. After the trigger As long as the AI value is not higher than the set AI trigger high value,
the current output value is always 0 (can be matched with DO linkage) .
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ME31- XAAX0440 _User Manual
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