Month: June 2016

Input/Output Architectures

Input/Output Architecture in the control system We will give an overview of most common input/output architectures in a control system, depending on whether the priority is “Safety” or “Availability“. 1-Architectures of Inputs The following image shows the most common configurations. The letter “D” in yellow stands for “Diagnosis” and usually is associated with the Safety …

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Relay Redundant System

Relay Redundant System Let’s see a simple example of how we can increase the safety of our design using conventional electromechanical relays. Suppose we have a high pressure steam line with three safety pressure switches wired to an intermediate relay. We also make a wired 2 out of 3 logic, so that the circuit is …

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