Chengdu Ebyte Electronic Technology Co.,Ltd.
【4AI+4DO】MA02-XACX0440
User Manual
Copyright ©2012–2021
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Chengdu Ebyte Electronic Technology Co.,Ltd.
15
4 Product Features
4.1 Analog Input AI
4.1.1 Analog input AI description
The analog input AI measures the current signal, the acquisition range is 0-20mA or 4-20mA, the
accuracy is 3‰, and the resolution is 12 bits. Adopt single-ended input, sampling frequency 10Hz,
input impedance 100Ω.
4.1.2 Analog input AI filter parameters
The filter parameters of the AI channel can be set, the effective value is 1-16, and the default is 6.
Note:
(1) AI channel filter parameter is a filter parameter shared by all AI channels. The larger the filter
parameter, the stronger the anti-interference ability of AI sampling, but at the same time it has a
delay.
(2) AI channel filter parameter address is 0x04B0, and the register type is holding register. Function
code 0x06, 0x10. When writing AI filter parameters, if the written parameter value is not within the
range of 1-16, it will automatically take the closest value to write. If the write filter parameter is 0,
the device will take 1 as the filter parameter, and Modbus will not return. Wrong instruction.
4.1.3 Analog input AI sampling range
Set the sampling range of all AI channels, valid values are 1 and 0 (default 0).
0: Represents 0
～
20mA
1: Represents 4
～
20mA
(1) The AI sampling range is shared by all channels. When the AI channel sampling range is
configured for 4-20mA sampling, if the current signal is lower than 4mA, the engineering value of
the channel is converted to 0. For signals greater than 20mA, there is no conversion limit, but it
cannot exceed 25mA (there is a risk of equipment damage if it exceeds 25mA).
(2) AI channel sampling range parameter address is 0x04B2, register type is holding register,
function code 0x06, 0x10. When writing the AI channel sampling range parameter, if the value of the
parameter written is not within the range of 0 to 1, it will automatically take the closest value to write.
If the write sampling range parameter is 2, the device will take 1 as the sampling range parameter.
And MDOBUS does not return an error command.
Summary of Contents for MA02-XACX0440
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