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Ladder Logic Programming

Posted: 3 July 2007

Those who have written PLC code for controlling motors and other automation may think “structured Ladder” is an oxymoron, believing Ladder code is inherently unstructured or worse. Even so, Ladder, li....... More >

RFID: A Technology Primer

Posted: 26 June 2007

Radio frequency identification (RFID) is a contactless identification method that doesn’t require direct line of sight. The "ID" comes in the form of a portable database on a coded tag that can store ....... More >

When is a System Obsolete?

Posted: 11 June 2007

In an era of light-speed technology development, we’ve grown to expect that equipment will end up in the trash bin long before it stops working. Sometimes a technology works so well that it’s impossib....... More >

Pressure Transducer Selection

Posted: 30 May 2007

Selecting the right pressure transducers for an application requires a close look at the following criteria: Need for isolation. One of the first questions to be asked is whether the transdu....... More >

The Five Sources of Sensor Error

Posted: 29 May 2007

Sensors, like all other devices suffer from certain errors. To maintain consistency, error is defined as the “difference between the measured value and the true value.” Although the full range of poss....... More >

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Choose the Right Cable for Power, Comms, Control

Posted: 15 May 2007

Selecting cable used to be easy. Users picked wire for communications and control or to supply power. They added accessories, trays and tracks, and connectors to fit their layout and facilities, and s....... More >

Selecting the Right Embedded Computer Form Factor

Posted: 7 May 2007

Form factor selection is not always simple. Each bus has its own set of advantages for certain types of applications: Single-board Computer Single-board computer (SBC) is the most cost-ef....... More >

Choosing Between a PLC and a PAC

Posted: 2 April 2007

The term “programmable automation controller” (PAC) has been around since the mid 1980s. Over the past five years or so, PACs have been offered by an increasing number of control vendors and are now c....... More >

Getting Access to HART Instrument Data

Posted: 23 March 2007

One of the great lost resources is the fact that so few pieces of HART enabled instrumentation can deliver all their capabilities. HART instrument....... More >

Protecting Network Connectors

Posted: 12 March 2007

Myriad industrial network options are only exceeded by the styles and brands of rugged connectors — designed to protect the points linking measurements, logic, actuation, and points in-between and bey....... More >

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