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GXAXA0404 distributed IO expansion module Supporting Standard Modbus Protocol Freely Configurable and Easily Expandable.
[Introduction]：The distributed IO expansion module adopts an expandable design in structure and needs to be used with our M31 series distributed IO host.
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| silk screen | name | illustrate |
| AI1 | AI1 analog input | AI1 analog input interface, used in conjunction with GND1 |
| GND1 | AI1 analog input ground | AI1 analog input ground interface |
| AI2 | AI2 analog input | AI2 analog input interface, used in conjunction with GND2 |
| GND2 | COM terminal of AI2 | AI2 analog input ground interface |
| AI3 | AI3 analog input | AI3 analog input interface, used in conjunction with GND3 |
| GND3 | COM terminal of AI3 | AI3 analog input ground interface |
| AI4 | AI4 analog input | AI4 analog input interface, used in conjunction with GND4 |
| GND4 | COM terminal of AI4 | AI4 analog input ground interface |
| AO1 | AO1 analog output (positive pole) | AO1 analog output (positive) interface, used in conjunction with GND1 |
| GND1 | AO1 analog output (negative pole) | Analog output (negative pole) interface of AO1 |
| AO2 | AO2 analog output (positive pole) | AO2 analog output interface, used in conjunction with GND2 |
| GND2 | AO2 analog output (negative pole) | AO2’s analog output (negative pole) interface |
| AO3 | AO3 analog output (positive pole) | AO3 analog output interface, used in conjunction with GND3 |
| GND3 | AO3 analog output (negative pole) | AO3’s analog output (negative pole) interface |
| AO4 | AO4 analog output (positive pole) | AO4 analog output interface, used in conjunction with GND4 |
| GND4 | AO4 analog output (negative pole) | Analog output (negative pole) interface of AO4 |
| VO+ | Power output positive pole | The positive pole of the power supply output is the same as the power supply voltage of the device. |
| VO+ | Power output positive pole | The positive pole of the power supply output is the same as the power supply voltage of the device. |
| VO- | Power output negative pole | The negative pole of the power supply output is the same as the power supply voltage of the device. |