PP8.1
Modbus Registers
Below is a list of available MODBUS registers. The same register numbers are also used by the MIOS-2 protocol.
Modbus Read / Write (0x17) Function
METEL IO modules have implemented the MODBUS function (0x17) Read/Write of Multiple registers. Typically it is required to have two separate requests (and responses) for:
1. Writing of outputs via MODBUS function (0x16) Writing Multiple Registers
2. Reading of inputs via MODBUS function (0x03) Read Holding Registers
This requires a total of 4 frames to be sent over MODBUS. If using 0x17 function only one request is needed for the reading and writing of outputs. This requires a total of 2 frames to be sent over MODBUS.
Default Settings of Communication
Device ID: 1
Baudrate: 115 200
Parity: None
Data bits: 8
Stop bits: 1
| Subject | Channel | Type | R/W | Value | Offset | |
|---|---|---|---|---|---|---|
| States of Digital Inputs and Relay Outputs |
Digital Input 1 | DI#01 | bit | R | 0 = inactive 1 = active |
3001 |
| Digital Input 2 | DI#02 | bit | R | 3002 | ||
| Digital Input 3 | DI#03 | bit | R | 3003 | ||
| Digital Input 4 | DI#04 | bit | R | 3004 | ||
| Balanced Input 1 | DI#05 | bit | R | 3005 | ||
| Balanced Input 2 | DI#06 | bit | R | 3006 | ||
| Balanced Input 3 | DI#07 | bit | R | 3007 | ||
| COIL Relay 1 | DI#08 | bit | R | 3008 | ||
| Inputs | DI#16 - DI#01 | u16 | R | 0x0000 - 0x00FF | 3001 | |
| States of Balanced Inputs |
Balanced Input 1 | AI#05 | u16 | R | 1000 = 1000Ω 0 = 0Ω |
5005 |
| Balanced Input 2 | DI#06 | u16 | R | 5006 | ||
| Balanced Input 3 | DI#07 | u16 | R | 5007 | ||
| Subject | Channel | Type | R/W | Value | Offset | |
|---|---|---|---|---|---|---|
| Input Mode |
Digital Input 1 | DI#01 mode | u16 | RW | 0 = None 1 = Falling Edge 2 = Rising Edge 3 = Change Edge |
3101 |
| Digital Input 2 | DI#02 mode | u16 | RW | 3102 | ||
| Digital Input 3 | DI#03 mode | u16 | RW | 3103 | ||
| Digital Input 4 | DI#04 mode | u16 | RW | 3104 | ||
| Balanced Input 1 | DI#05 mode | u16 | RW | 3105 | ||
| Balanced Input 2 | DI#06 mode | u16 | RW | 3106 | ||
| Balanced Input 3 | DI#07 mode | u16 | RW | 3107 | ||
| Counter | Digital Input 1 | DI#01 counter | u16 | R | 3201 - 02 | |
| Digital Input 2 | DI#02 counter | u16 | R | 3203 - 04 | ||
| Digital Input 3 | DI#03 counter | u16 | R | 3205 - 06 | ||
| Digital Input 4 | DI#04 counter | u16 | R | 3207 - 08 | ||
| Balanced Input 1 | DI#05 counter | u16 | R | 3209 - 10 | ||
| Balanced Input 2 | DI#06 counter | u16 | R | 3211 - 12 | ||
| Balanced Input 3 | DI#07 counter | u16 | R | 3213 - 14 | ||
| Subject | Channel | Type | R/W | Value | Offset | |
|---|---|---|---|---|---|---|
| Push-Pull and Relay Outputs |
Push-Pull Output 1 | DO#01 | bit | RW | 0 = inactive 1 = active |
4001 |
| Push-Pull Output 2 | DO#02 | bit | RW | 4002 | ||
| Push-Pull Output 3 | DO#03 | bit | RW | 4003 | ||
| Push-Pull Output 4 | DO#04 | bit | RW | 4004 | ||
| Push-Pull Output 5 | DO#05 | bit | RW | 4005 | ||
| Push-Pull Output 6 | DO#06 | bit | RW | 4006 | ||
| Push-Pull Output 7 | DO#07 | bit | RW | 4007 | ||
| Push-Pull Output 8 | DO#08 | bit | RW | 4008 | ||
| Relay Output 1 | DO#09 | bit | RW | 4009 | ||
| Outputs | DO#16 - DI#01 | u16 | RW | 0x0000 - 0x000F | 4001 | |
| Modes of Outputs |
Push-Pull Output 1 | DO#01 mode | u16 | RW | 0 = None (default) 1 = Push (PNP) 2 = Push (NPN) |
4101 |
| Push-Pull Output 2 | DO#02 mode | u16 | RW | 4102 | ||
| Push-Pull Output 3 mode | DO#03 | u16 | RW | 4103 | ||
| Push-Pull Output 4 mode | DO#04 | u16 | RW | 4104 | ||
| Push-Pull Output 5 mode | DO#05 | u16 | RW | 4105 | ||
| Push-Pull Output 6 mode | DO#06 | u16 | RW | 4106 | ||
| Push-Pull Output 7 mode | DO#07 | u16 | RW | 4107 | ||
| Push-Pull Output 8 mode | DO#08 | u16 | RW | 4108 | ||
Note: To activate the bootloader, it is necessary to write a value 617 into the registry with an offset 1204 and restart the device.
