It's All About the Outputs

May 4, 2016 9:43:30 AM | Posted by Jay Griffin

Inputs are nice to look at, but if you're not turning on outputs, you're not doing anything.

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A control system is only as good as the input/output (I/O) attached to it. The I/O is the pipeline to instrumentation in the field and is how the control system visualizes and manipulates the process.

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Safety instrumented systems: Tips from the trenches: Part II

Aug 5, 2015 11:08:20 AM | Posted by Jay Griffin

The two-part installment introduces safety instrumented systems (SIS) and outlines specific tips on designing, developing, and verifying SIS applications.

Part one of this article outlined the purpose and application of the safety instrumentedsystem (SIS) as well as specific nuances with the safety integrity layer (SIL) calculations and general tips to consider when designing, developing and verifying a safety instrumented system. Keep in mind that the SIS is used for safety, not basic control. While the basic process control system (BPCS) is the workhorse of automation, the SIS is the last line of defense for the process and intended as a critical shutdown system. This second and final installment of the article wraps up by exploring tips for SIS hardware and the control system interface.

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Safety instrumented systems: Tips from the trenches: Part I

Jul 30, 2015 9:25:25 AM | Posted by Jay Griffin

The two-part installment introduces safety instrumented systems (SIS) and outlines specific tips on designing, developing, and verifying SIS applications.

Today’s article focuses on the purpose and application of the SIS as well as safety integrity layer (SIL) calculations. The second installment will finish up with exploring tips for SIS hardwarde and the control system interface. 

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Control system documentation: Don’t trust, field verify

Feb 20, 2015 4:43:00 AM | Posted by Jay Griffin

When referring to control systems, the only things that engineers can rely on are what is in the field and the live configuration running in a controller.

It would be nice if control system documentation could be trusted. It would also be nice if pigs could fly. Both scenarios are equally as likely.

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