Detailed Function; Analog Input Ai; Analog Input Ai Collection; Analog Input Ai Filter Parameters - Ebyte MA02-AAC 2220 Series User Manual

2di + 2ai + 2do

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4 Detailed function

The analog input AI measures the current signal, with acquisition range 0-20mA or 4-20mA,

resolution 12 bits. Adopt single-ended input, sampling frequency 10Hz, input impedance 100Ω.

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 shared by all AI channels. The larger the filter parameter, the stronger the

anti-interference ability of AI sampling, while it has time delay at the same time .

(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. For example, if writing filter parameter 0, the device will take 1 as the filter

parameter, and Modbus will not return wrong instruction in this case.

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：Represent 0～20mA

1：Represent 4～20mA

(1) The AI sampling range is shared by all channels. When the AI channel sampling range is configured as 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, the 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.

【2DI+2AI+2DO】MA02-AACX2220 User Manual

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