Fieldbus & networking
Modbus TCP
Simple, widely supported Ethernet protocol for exchanging registers between a robot controller and PLCs, sensors, or third-party equipment.
Modbus TCP wraps the original Modbus RTU register model in standard TCP/IP packets, so almost any device with an Ethernet port can act as a client or server. Robot controllers often expose Modbus TCP as a lightweight option when the PLC or plant system doesn't support the robot vendor's native protocol.
The protocol only defines a handful of function codes for reading and writing coils and registers, so integrators build their own data map to represent robot status, part counts, and recipe selection. Every installation needs its own documentation of what each register means.
Modbus TCP has no built-in security, so it is normally kept inside a trusted plant network segment rather than exposed more broadly.
Common questions
- What does Modbus TCP do?
- Simple, widely supported Ethernet protocol for exchanging registers between a robot controller and PLCs, sensors, or third-party equipment.
- What does Modbus TCP work with?
- It works with Generic PLCs, Third party sensors, SCADA link, Cell controller.
- What should I watch for with Modbus TCP?
- No native security, keep on an isolated network segment. Register maps are custom per installation and must be documented. Polling-based exchange is slower than implicit I/O protocols.