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2. DF-1 Protocol - Wikipedia

   en.wikipedia.org/wiki/DF-1_Protocol

   DF-1 / DF1 protocol is an asynchronous byte-oriented protocol that is used to communicate with most Allen Bradley RS-232 interface modules. DF1 protocol consists of link layer and application layer formats. DF1 works over half duplex and full duplex modes of communication.

3. Programmable logic controller - Wikipedia

   en.wikipedia.org/wiki/Programmable_logic_controller

   The input/output arrangements may be built into a simple PLC, or the PLC may have external I/O modules attached to a fieldbus or computer network that plugs into the PLC. The functionality of the PLC has evolved over the years to include sequential relay control, motion control, process control, distributed control systems, and networking.

4. List of automation protocols - Wikipedia

   en.wikipedia.org/wiki/List_of_automation_protocols

   ControlNet – an implementation of CIP, originally by Allen-Bradley; DeviceNet – an implementation of CIP, originally by Allen-Bradley; DF-1 - used by Allen-Bradley ControlLogix, CompactLogix, PLC-5, SLC-500, and MicroLogix class devices; DNP3 - a protocol used to communicate by industrial control and utility SCADA systems

5. Allen-Bradley - Wikipedia

   en.wikipedia.org/wiki/Allen-Bradley

   Allen-Bradley is the brand-name of a line of factory automation equipment owned by Rockwell Automation.The company, with revenues of approximately US $6.4 billion in 2013, manufactures programmable logic controllers (), human-machine interfaces, sensors, safety components and systems, software, drives and drive systems, contactors, motor control centers, and systems of such products.

6. DeviceNet - Wikipedia

   en.wikipedia.org/wiki/DeviceNet

   DeviceNet was originally developed by American company Allen-Bradley (now owned by Rockwell Automation). It is an application layer protocol on top of the CAN (Controller Area Network) technology, developed by Bosch. [2] DeviceNet adapts the technology from the Common Industrial Protocol into an open standard. [3]

7. Rockwell Automation - Wikipedia

   en.wikipedia.org/wiki/Rockwell_Automation

   In 1985, Rockwell International purchased Allen-Bradley for $1.651 billion; this was the largest acquisition in Wisconsin's history to date. [3] For all intents and purposes, Allen-Bradley took over Rockwell's industrial automation division. The 1990s featured continued technology development, including the company's launch of its software ...