Articles & News on Process Automation and Control

Ziegler-Nichols Tuning Rules And Limitations

  • by John Gerry, P.E.
  • News

The standard reference for PID tuning seems to be the Ziegler-Nichols tuning rules developed in 1942 on a pneumatic controller.

Water Security: The Role of the SCADA System

  • by Kevin Finnan
  • News

With security assessments and implementation of appropriate measures receiving the full attention of the water industry, we have been exploring how technology can contribute to these efforts. 

The Fast Way to Tune Slow Loops

  • by John Gerry, P.E.
  • News

To tune a control loop, analysis software must process some loop data. You must test or bump the loop somehow. For example a setpoint change in automatic or a controller output change in manual mode. 

Buhler’s Grain Milling Automation Relies on OPC Technology

  • Case Study

Buhler, a provider of grain milling solutions, standardized on Softing’s industry-hardened S7/S5 OPC Server to provide reliable connectivity between Buhler’s “WinCoS.r2” automation system and multiple S7-400 PLC’s

Arbonne International Automates Distribution Center

  • by Thomas R. Cutler
  • News

Network marketing is a distribution system, or form of marketing, which channels goods or services from the manufacturer to the consumer through a "network" of independent distributors or consultants. 

Derivative Action - The Good, Bad, and Ugly

  • by John Gerry, P.E.
  • News

The reason to use derivative (or D) is that you can use more Proportional and especially more Integral action. The result can be a much faster reacting control loop.

Five factors that can affect your weighing system's accuracy

  • by Ted Kopczynski and Dave Ness
  • Opinion

This article discusses five factors that can affect the weighing system's accuracy and provides advice on selecting, installing, and operating the system to handle these factors.