Communication Protocols

Advanced Message Queuing Protocol for reliable message-oriented middleware.

Simple two-wire bus system for connecting binary sensors and actuators at lowest field level.

Building Automation and Control network protocol for HVAC and building management systems.

Wireless protocol for battery-powered sensors and mobile integration.

High-level protocol based on CAN bus used in embedded systems and industrial automation.

Mitsubishi-developed open fieldbus for high-speed control and information networking.

Constrained Application Protocol for simple IoT devices with limited resources.

Deterministic network for real-time control applications with scheduled and unscheduled messaging.

Data Distribution Service for real-time, scalable, and interoperable data exchange.

CAN-based network protocol for industrial automation connecting PLCs to devices like sensors and actuators.

Allen-Bradley serial protocol for point-to-point communication with SLC/MicroLogix PLCs.

Data Highway 485, multi-drop network for Allen-Bradley SLC 500 and MicroLogix PLCs.

Data Highway Plus, proprietary Allen-Bradley token-passing network for PLC-5 systems.

Distributed Network Protocol used in SCADA systems for electric and water utilities.

Ethernet for Control Automation Technology, ultra-fast industrial Ethernet by Beckhoff.

Industrial Ethernet protocol using standard TCP/IP and CIP (Common Industrial Protocol), primarily used with Rockwell Automation/Allen-Bradley systems.

Safety protocol extension of EtherNet/IP for fail-safe communication.

Omron's Factory Interface Network Service protocol for communication with Omron PLCs.

All-digital protocol for process automation with distributed control capabilities.

Protocol for establishing communication and verifying data transfer readiness.

Highway Addressable Remote Transducer protocol combining 4-20mA analog with digital communication.

Telecontrol protocol standard used primarily in European electrical and water systems.

Standard for electrical substation automation and communication between IEDs.

Phoenix Contact ring-based fieldbus with automatic addressing and diagnostics.

Point-to-point serial communication protocol for intelligent sensors and actuators.

Wireless standard for industrial automation and control.

Vehicle bus standard based on CAN for heavy-duty vehicles.

Worldwide standard for home and building automation supporting multiple physical media.

Networking platform for building automation and control applications using LonTalk protocol.

Long-range wireless protocol for IoT devices with low power consumption.

Meter-Bus protocol for remote reading of utility meters.

Panasonic's proprietary protocol for communication with FP series PLCs.

An open serial communication protocol developed in 1979, widely used for connecting industrial electronic devices, available in RTU (serial) and TCP/IP (Ethernet) variants.

ASCII-encoded Modbus variant, less efficient but human-readable for debugging.

Proprietary token-passing variant of Modbus for peer-to-peer communication.

Binary implementation of Modbus protocol over serial lines using compact data representation.

TLS-secured version of Modbus TCP for encrypted communication.

Lightweight publish-subscribe messaging protocol ideal for IIoT and remote monitoring.

Open standard for manufacturing equipment data exchange and CNC machine monitoring.

OPC Alarms & Events for standardized alarm and event notification.

Original OPC specification based on Microsoft COM/DCOM for Windows-based data exchange.

OPC Data Access for real-time data exchange between control devices and HMI/SCADA.

OPC Historical Data Access for retrieving archived process data from historians.

Platform-independent service-oriented architecture for industrial communication, providing secure, reliable data exchange between PLCs, SCADA, MES, and enterprise systems.

Master device sequentially requesting data from slave devices.

Ethernet-based real-time protocol using time-slot mechanism for deterministic communication.

Decentralized Periphery variant of PROFIBUS for high-speed factory automation.

Process Automation variant of PROFIBUS for intrinsically safe process industries.

Industrial Ethernet standard developed by Siemens/PROFIBUS International for real-time automation, supporting standard and isochronous real-time communication.

Isochronous Real-Time PROFINET for motion control with cycle times under 1ms.

Messaging pattern where publishers send data to subscribers via broker.

Communication pattern where client requests data and server responds.

Representational State Transfer architecture for web services integration with PLCs.

Standard serial communication interface for point-to-point connections up to 50 feet.

Differential serial standard supporting longer distances and higher speeds than RS-232.

Multi-drop serial standard supporting up to 32 devices over 4000 feet.

Semiconductor Equipment Communication Standard for fab automation.

Serial Real-time Communication System for high-performance motion control over Ethernet.

Seamless Message Protocol by Mitsubishi for communication with MELSEC PLCs.

IEEE standards for deterministic Ethernet enabling real-time communication over standard networks.

Full-duplex communication protocol over TCP for real-time web-based HMI applications.

Wireless extension of HART protocol for process instrumentation.