January 2006

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HP Automation Safety: What about the valve?

For a long time, the focus of safety instrumented system design has been on the logic solver. For many, including myself, this started when I first heard about a "certified" safety programmable logic ..

Goble, W., exida LLC

For a long time, the focus of safety instrumented system design has been on the logic solver. For many, including myself, this started when I first heard about a "certified" safety programmable logic controller (PLC) in the late 1980s. I remember magazine articles and advertisements featuring the new TMR PLCs. The clear implication was that designs done with conventional PLC logic solvers were not safe. So, what are the differences between special "purpose-built" machines and normal PLC/DCS designs that I had understood so well? This attention soon escalated as different architectures appeared on the market. The "dual" vs. "triple" vs. "quad" reinforced the message that the logic solvers w

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