[Introduction]:The M31 series distributed IO host supports Modbus TCP protocol and Modbus RTU protocol for acquisition control. The device supports simultaneous access by 5 clients and supports function codes 01/02/03/04/05/06/15/16. The product adopts an scalable design in structure. During use, if the user finds that the current device has some functions When the needs cannot be met, you can select the corresponding IO expansion modules according to the missing functions and splice them together to achieve the functions. There is no need to purchase the whole machine. This saves costs and facilitates customers to access the current on-site environment; the modules are self-contained. With status diagnosis function, it can monitor the communication status of IO modules in real time; it can support a maximum of 16 IO expansion modules.
| Symbol | name | Function /Description |
| Dll | Dll switch input | Dll switch input interface, used in conjunction with C0M1 |
| C0M1 | COM terminal of Dll | COM side ofDIl |
| DI2 | DI2 switch input | DI2 switch input interface, used in conjunction with COM2 |
| COM2 | COM side of DI2 | COM2 end ofDI2 |
| DI3 | DI3 switch input | DI3 switch input interface, used in conjunction with COM3 |
| COM3 | COM side of DI3 | COM side of DI3 |
| DI4 | DI4 switch input | DI4 switch input interface, used in conjunction with COM4 |
| COM4 | COM side of DI4 | COM side of DI4 |
| DI5 | DI5 switch input | Dll switch input interface, used in conjunction with COMS |
| COM5 | COM side of DI5 | COM side of DI5 |
| DI6 | DI6 switch input | DI6 switch input interface, used in conjunction with CO\I6 |
| C0M6 | COM side of DI6 | COM side of DI6 |
| DI7 | DI7 switch input | DI7 switch input interface, used in conjunction with C0M7 |
| COM7 | COM side of DI7 | COM side of DI7 |
| DI8 | DIS switch input | DI8 switch input interface, used in conjunction with C0M8 |
| COM8 | COM side of DI8 | COM side of DIS |
| VO+ | Power output positive pole | The positive pole of the power supply output is consistent with the power supply voltage of the device. |
| VO+ | Power output positive pole | The positive pole of the power supply output is consistent with 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. |
| Reload | Factory reset auto-negotiation | Press and hold for 5-10 seconds to restore factor}- settings; double-click within 2 seconds to automatically negotiate the expansion module |
| A(RS485) | RS485 A interface | RS485 A interface |
| B(RS485) | RS485 B interface | RS485 B interface |
| G(RS485) | RS485G interface | RS485G interface |
| PE | ground | ground |
| V-(DC9-36 V) | Negative pole of power supply | DC (9-3 6V) power supply negative interface |
| V+ (DC9-36 V) | Positive pole of power supply | DC (9-3 6V) power supply positive interface |
| LAN1 | Network port | Standard RJ45 network cable interface |