Modbus driver
Observe these guidelines when working with Modbus controllers.
Protocols
The Modbus communication driver supports these protocols:
- Modbus TCP. TCP Socket access mode.
- Modbus RTU. Serial port access mode.
Data types
The Modbus communication driver supports these data types:
Data type | Length |
|---|---|
Bool | 1 bit |
Byte | 1 byte |
SByte | 1 byte |
UInt16 | 2 bytes |
Int16 | 2 bytes |
UIn32 | 4 bytes |
Int32 | 4 bytes |
Uint64 | 8 bytes |
Int64 | 8 bytes |
Float | 4 bytes |
Double | 8 bytes |
String | 80 characters by default |
Array |
Data areas
The Modbus communication driver supports these data areas:
Area | Modbus Function Code (Hex) | Addressing | Data Type | Access | Ranges |
|---|---|---|---|---|---|
Single Coils | 01 Read 05 Write (Single) | Coil Status | Boolean | Read/Write | 0-65535 |
Coils | 01 Read 15 Write (multiple) | Coil Status | Boolean | Read/Write | 0-65535 |
Discrete Inputs | 02 Read | Input Status | Boolean | Read Only | 0-65535 |
Single Register | 03 Read 06 Write | Holding Register | Word | Read/Write | 0-65535 |
Multiple Register | 03 Read 10 Write | Holding Register | Word | Read/Write | 0-65535 |
Input Register | 04 Read | Input Register | Word | Read Only | 0-65535 |
TIP:
The addressing may differ from device to device. For more information, refer to the device documentation.
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