Glossary · Industrial communication
Modbus TCP integration
Also known as: Modbus TCP connection, Modbus TCP interfacing
German: Modbus-TCP-Integration
In automation engineering, Modbus TCP integration is the task of connecting a device or system to a controller, SCADA or IT application over Modbus TCP, including network setup, register mapping, data type conversion, polling configuration and error handling.
- Industrial communication
In one sentence
Modbus TCP integration connects a device to a controller or SCADA over Modbus TCP: network, register mapping, data types and error handling.
Example
To integrate a new chiller, the engineer maps its 40 holding registers to PLC tags, sets a 1-second poll rate and raises an alarm after three failed requests.
How it applies
- Engineering: The integration starts from the device's register map and the Communication matrix. Each register is mapped to a tag with the correct data type, byte and word order, and scaling.
- Commissioning: Values are checked against the device display or a reference measurement. Typical errors are shifted addresses, swapped words in 32-bit values and wrong scaling factors.
- Operation: The integration defines what happens when the device doesn't answer: Timeout, retries, and how the application marks Stale data instead of showing the last value as current.
- Documentation: The documentation team records the mapping table, poll rates, connection parameters and error behavior as part of the Interface specification, so the integration can be maintained by someone who didn't build it.
Integration vs. protocol
Modbus TCP is the protocol. Integration is the project work around it: agreeing on meanings, mapping data and handling failures. Most integration effort goes into the data, not the transport.