IF-15
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
Note: The MODBUS address is the same as the address of the main device of which the IF module is part.
| Subject | Channel | Type | R/W | Value | Offset | |
|---|---|---|---|---|---|---|
| IF-15(G) States of Inputs |
Open Collector 1 | DO#33 | bit | RW | 0 = inactive 1 = active |
4033 |
| Open Collector 2 | DO#34 | bit | RW | 4034 | ||
| Open Collector 3 | DO#35 | bit | RW | 4035 | ||
| Open Collector 4 | DO#36 | bit | RW | 4036 | ||
| Outputs | DI#33 - DI#48 | u16 | R | 0x0000 - 0x000F | ||
