PROFINET
What is PROFINET?
PROFINETAn industrial Ethernet protocol standardized by PROFIBUS & PROFINET International for real-time communication between PLCs, drives, and field devices.
PROFINET is the dominant industrial-Ethernet standard in discrete manufacturing, defined by PROFIBUS & PROFINET International (PI) and IEC 61158. It runs cyclic real-time (RT) traffic alongside isochronous real-time (IRT) and standard TCP/IP traffic on the same Ethernet wire, connecting PLCs, drives, I/O blocks, robots, and HMIs. Most legacy deployments expose plain unauthenticated frames, leaving them vulnerable to spoofing, ARP-based hijacking, and configuration-frame attacks that can stop production. PROFINET Security Class 1-3 and the new PROFINET Security profile add device authentication and integrity, but adoption is gradual; defenders typically rely on switch-level isolation, deep-packet-inspection firewalls, and 802.1X port security.
● Examples
- 01
A Siemens S7-1500 PLC controlling distributed I/O and Sinamics drives via PROFINET RT.
- 02
An automotive paint shop using PROFINET IRT for synchronized robotic motion.
● Frequently asked questions
What is PROFINET?
An industrial Ethernet protocol standardized by PROFIBUS & PROFINET International for real-time communication between PLCs, drives, and field devices. It belongs to the OT / ICS / IoT category of cybersecurity.
What does PROFINET mean?
An industrial Ethernet protocol standardized by PROFIBUS & PROFINET International for real-time communication between PLCs, drives, and field devices.
How does PROFINET work?
PROFINET is the dominant industrial-Ethernet standard in discrete manufacturing, defined by PROFIBUS & PROFINET International (PI) and IEC 61158. It runs cyclic real-time (RT) traffic alongside isochronous real-time (IRT) and standard TCP/IP traffic on the same Ethernet wire, connecting PLCs, drives, I/O blocks, robots, and HMIs. Most legacy deployments expose plain unauthenticated frames, leaving them vulnerable to spoofing, ARP-based hijacking, and configuration-frame attacks that can stop production. PROFINET Security Class 1-3 and the new PROFINET Security profile add device authentication and integrity, but adoption is gradual; defenders typically rely on switch-level isolation, deep-packet-inspection firewalls, and 802.1X port security.
How do you defend against PROFINET?
Defences for PROFINET typically combine technical controls and operational practices, as detailed in the full definition above.
What are other names for PROFINET?
Common alternative names include: PROFINET IO, PROFINET RT/IRT.
● Related terms
- ot-iot№ 864
Programmable Logic Controller (PLC)
A ruggedized industrial computer that executes deterministic control logic to read sensors and drive actuators in real-time processes.
- ot-iot№ 529
Industrial Control System (ICS)
An umbrella term for systems that automate and supervise industrial processes, including SCADA, DCS, PLCs, RTUs, and safety controllers.
- ot-iot№ 702
Modbus
A simple, openly documented industrial protocol for polling registers and coils on PLCs, RTUs, and field devices, available over serial (RTU/ASCII) and TCP.
- ot-iot№ 758
OPC UA
OPC Unified Architecture, a service-oriented industrial protocol with built-in authentication and encryption used to exchange semantic data across OT and IT systems.
- ot-iot№ 762
Operational Technology (OT)
Hardware and software that monitor and control physical processes, devices, and infrastructure such as factories, power plants, and utilities.
- ot-iot№ 513
IEC 62443
The IEC family of standards for the cybersecurity of industrial automation and control systems, addressing asset owners, integrators, and product suppliers.