Modbus ethernet

thumb|Logo of Modbus-IDA, the older name of the industry consortium

Key facts

Technology standard.title: Modbus
Technology standard.image: Logo of Modbus.svg
Technology standard.status: Active
Technology standard.version: Modbus application protocol specification V1.1b3
Technology standard.version_date: April 26, 2012
Technology standard.domain: Fieldbus

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Commons category: Modbus

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~29 min read

Article

26 sections

Contents

Protocol description
PDU and ADU
Modbus transaction and PDU
Modbus data model
Function code
Public function codes
Function code 01 (read coils) as an example of public function code
User-defined function codes
Reserved function codes
Exception responses
Modbus over Serial Line protocol
Modbus RTU
Modbus ASCII
Modbus messaging on TCP/IP
Modbus TCP
Example of a Modbus TCP/IP ADU/Modbus TCP frame in hexadecimal
Other Modbus protocol versions over TCP/IP
Other Modbus protocol versions
JBUS mapping
Limitations
See also
References
Works cited
External links
Official
Other

thumb|Logo of Modbus-IDA, the older name of the industry consortium

Modbus, sometimes stylized as MODBUS, is a fieldbus, an industrial computer networking protocol. It was originally designed for use with programmable logic controllers (PLCs), but has become a de facto standard communication protocol for communication between industrial electronic devices in a wide range of buses and networks.