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Modbus. A community for the Modbus communications protocol - data communication between devices over TCP/IP and over serial line – open and royalty-free since 1979. Visit Modbus.org to download the Modbus protocol specification and implementation guides.
Relays are magnetic electromechanical devices with two primary purposes: to isolate different circuit voltages, and to form larger complex networks of logic to run machines without digital controllers. An electromechanical relay is an electrical switch actuated by an electromagnet coil. As switching devices, they exhibit simple “on” and ...
Valve packing is a sealant that prevents fluid leaks from entering the stem and body of the valve, keeping it contained to the closed system. It usually consists of string with polymer or graphite lubricant. Regardless of valve type, all stem-actuated control valves require some form of seal allowing motion of the stem from some external device ...
Sep 25, 2024 · Motion, Vision, and Control: The Whole Automation Package at Beckhoff. Join Control Automation for a visit to Beckhoff USA in Minneapolis, MN, as we learn about cabinet-free controls, high-speed motion, and magnetic conveyance working to drive the future of the industry. September 10, 2024 by David Peterson.
Cascade Control - Nested Feedback Loops. To cascade controllers means to connect the output signal of one controller to the setpoint of another controller, with each controller sensing a different aspect of the same process. The first controller (called the primary, or archaically, master) essentially “gives orders” to the second controller ...
Control valves are comprised of two major parts: the valve body, containing all the mechanical components necessary to influence fluid flow; and the valve actuator, providing the mechanical power necessary to move the valve body components. Often times, the major difference between an on/off control valve and a throttling control valve is the ...
Aug 7, 2022 · Grounding for Control Transformers. August 07, 2022 by David Peterson. Grounding transformer connections presents its own set of challenges. This article addresses these challenges and several common configurations for control transformer grounding. Any electrical control equipment schematic reveals a large number of bonded ground connections.
Control valves configured to follow the command of the same controller are said to be split-ranged, or sequenced. Split-ranged control valves may take different forms of sequencing. A few different modes of control valve sequencing are commonly seen in the industry: complementary, exclusive, and progressive. Complementary valve sequencing
Feedforward Control. “Feedforward” is a rather under-used control strategy capable of managing a great many types of process problems. It is based on the principle of preemptive load counter-action: that if all significant loads on a process variable are monitored, and their effects on that process variable are well-understood, a control ...
