What functionality/features are today's programmable logic controller (PLC) users seeking? How are they applying PLCs? Is any other technology, such as personal computers, taking away market share from PLCs? Control Engineering wanted to know, so we asked a random sampling of 1,500 readers to participate in a survey about today's PLC.
How is redundancy implemented for PC-based control? The first step is defining a physical interface to the real world that will provide multiple computers controlling the same I/O system.One way to provide multiple "controllers" is to implement a "mirroring backup" so that another system also collects all data.
In your recent "How Software Tools Simplify Loop Tuning" article [Control Engineering, Nov. 1997, p. 89] you imply that ExperTune connects only to PLCs. ExperTune has a DDE connection that connects directly to Fisher/Provox (via SIU, HDL), Honeywell TDC systems (using GUS workstations), and Bailey DCS (via SIU).
More users, system integrators, and manufacturers of control hardware and software are realizing the benefits of digital networks at the sensor, device, and fieldbus levels.In this kickoff of the "Year of the Network" series, Control Engineering asked leaders associated with 12 major industrial networks to reveal growth projections, ideal applications, views on standards, and future out...
The southern tip of California's Marin county is separated from the city of San Francisco by the most famous mile-long strip of steel and concrete in the world. Yet, within a 10-minute walk of the Golden Gate's Marin terminus begins a county-wide network of California Wildlife Service signs warning against mountain lion attacks.
OPC on the ISA TECH/97 Floor OLE for Process Control (OPC) was demonstrated on the floor at ISA TECH/97. Based on Microsoft’s component object model technology, OPC allows components in a networked system to share process data. The Microsoft and OPC booths demonstrated the interoperability of products from 16 foundation members. The booth demonstrations show real-time data flowing between hardware such as programmable logic controllers and distributed I/O from various manufacturers to human-machine interface and supervisory control and data acquisition software systems over Ethernet using TCP/IP.
Boeing Explores Development of ‘Smart’ Transducer Bus Lee Eccles of Boeing Commercial Airplane Co. began his presentation in the ‘Use of Automation to Enhance Productivity in the Aerospace Industry’ by asking the question ‘why bother?’ In structural sensing and testing of airplane wings and fuselages at Boeing, a lot of effort goes into simply setting up the test. Structures for destructive testing of a wing or testing flight-control actuators require huge setup times.
Keynote Speaker Caspar Weinberger Stresses Security for Global Growth In his keynote address to the ISA TECH/97 crowd, former defense secretary Caspar Weinberger stressed security issues as a key in the growth of the global economy. Using the example of how the recent examples of the devaluation of Mexico’s currency and the recession in Japan and it’s effects on other countries, he stressed that events in one country ‘ripples through the world quickly.’ He also emphasized that the US’ role in global security is vital to fostering global growth. Mr.
Control Engineering editors— in the 14th annual process—highlighted the best products of the year, based on technological advancement, impact on the market, and service to industry.Editors selected from among thousands of products mentioned in Control Engineering and Control Engineering Online during year 2000, in nine product categories: Control components; Human-machine interface...