[Introduction]:The distributed IO expansion module adopts an scalable design in structure and needs to be used with our M31 series distributed IO host.
| Symbol | name | Function/ Description |
| Dll | Dll switch input | Dll switch input interface, used in conjunction with COM1 |
| COM1 | COM terminal of Dll | COM terminal of Dll |
| DI2 | DI2 switch input | DI2 switch input interface, used in conjunction with COM2 |
| COM2 | COM side ofDI2 | COM2 end ofDI2 |
| DI3 | DI3 switch input | DI3 switch input interface, used in conjunction with COM3 |
| COM3 | COM side ofDI3 | COM side ofDI3 |
| DI4 | DI4 switch input | DI4 switch input interface, used in conjunction with COM4 |
| COM4 | COM side ofDI4 | COM side ofDI4 |
| DI5 | DI5 switch input | Dll switch input interface, used in conjunction with COM5 |
| COM5 | COM side ofDI5 | COM side ofDI5 |
| DI6 | DI6 switch input | DI6 switch input interface, used in conjunction with COM6 |
| COM6 | COM side ofDI6 | COM side ofDI6 |
| DI7 | DI7 switch input | DI7 switch input interface, used in conjunction with COM7 |
| COM7 | COM side ofDI7 | COM side ofDI7 |
| DI8 | DI8 switch input | DI8 switch input interface, used in conjunction with COM8 |
| COM8 | COM side ofDI8 | COM side ofDI8 |
| 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. |