In this section we try to explain many basic concepts about design of control systems that are not always clear and recommend some good practices on how to make the design. There are many aspects we treat: the control panel, options for redundant architectures, design of a fail safe system, different types of logics (1oo2, 2oo2, 2oo3,…), some tips when selecting I/O modules, etc. Let us know if you are interested in a specific topic.

Why Cpt is so important?

Why Cpt is so important? In the process industry when we calculate the Probability of Failure on Demand (PFDavg) of a Safety Instrumented Function (SIF) we …
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Dangerous failures in the SIS

Dangerous failures of the SIS When calculating Probability of Failure of a Safety Instrumented Function (SIF), the most important are the dangerous failures, as we see …
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The diagnostics in the SIS

The importance of diagnostics in the SIS The diagnostics in an Safety Instrumented System (SIS) are of crucial importance because they are the key to reduce …
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Common cause failures

The importance of common cause failures When designing a control system, we should paid special attention to common cause failures, that is, to the factors that …
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SIL requirements

SIL requirements – Systematic Capability, Failure Probability and Architectural Constraints. The designer of the safety instrumented function must verify that the 3 SIL requirements of the …
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Power Supply (phase 6)

Phase 6: Power Supply and Circuit Breakers In this article we discuss the design of 24 VDC power supply and circuit breakers (index of design phases). 6-Power …
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HMI / SCADA (phase 5)

Phase 5: Selection of HMI In this article we discuss the selection of the HMI / SCADA (index of design phases). 5-Selection of HMI or SCADA In medium …
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