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2. Remote terminal unit - Wikipedia

   en.wikipedia.org/wiki/Remote_Terminal_Unit

   A remote terminal unit (RTU) is a microprocessor-controlled electronic device that interfaces objects in the physical world to a distributed control system or SCADA (supervisory control and data acquisition) system by transmitting telemetry data to a master system, and by using messages from the master supervisory system to control connected objects. [1]

3. IO-Link - Wikipedia

   en.wikipedia.org/wiki/IO-Link

   IO-Link is a short distance, bi-directional, digital, point-to-point, wired (or wireless), industrial communications networking standard (IEC 61131-9) used for connecting digital sensors and actuators to either a type of industrial fieldbus or a type of industrial Ethernet. [1]

4. Profinet - Wikipedia

   en.wikipedia.org/wiki/PROFINET

   The IO-Controller, which controls the automation task. The IO-Device, which is a field device, monitored and controlled by an IO-Controller. An IO-Device may consist of several modules and sub-modules. The IO-Supervisor is software typically based on a PC for setting parameters and diagnosing individual IO-Devices.

5. CompactRIO - Wikipedia

   en.wikipedia.org/wiki/CompactRIO

   The CompactRIO system is a combination of a real-time controller chassis, reconfigurable IO Modules (RIO), an FPGA module and an Ethernet expansion chassis. [2] Third-party modules are also available, and are generally compatible with NI-produced chassis controllers.

6. Modbus - Wikipedia

   en.wikipedia.org/wiki/Modbus

   Modbus or MODBUS is a client/server data communications protocol in the application layer. [1] It was originally designed for use with programmable logic controllers (PLCs), [2] but has become a de facto standard communication protocol for communication between industrial electronic devices in a wide range of buses and networks.

7. Highway Addressable Remote Transducer Protocol - Wikipedia

   en.wikipedia.org/wiki/Highway_Addressable_Remote...

   The HART Communication Protocol (Highway Addressable Remote Transducer) is a hybrid analog+digital industrial automation open protocol. Its most notable advantage is that it can communicate over legacy 4–20 mA analog instrumentation current loops, sharing the pair of wires used by the analog-only host systems.