Month: May 2016

Availability versus Safety

Availability versus Safety This is an important point to be considered when designing a control system with a programmable logic controller. The analysis must be performed with all the elements involved: the PLC, field instruments, valves, motors, dampers, etc. In addition, it is essential to analyze the process or machine. The design will be very …

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What’s a safety PLC?

What is a safety PLC? Let’s try to explain it in a simple way for non-experts. The fundamental difference with a general purpose PLC is summed up in one word “Diagnosis”. In addition, there are differences in terms of internal architecture, software and firmware, and certification for applications where compliance with a certain SIL level …

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Why range 4 – 20 mA

Why range 4 – 20 mA? Since a lot of years the use of 4-20 mA standard range has been popularized because it has many advantages that we are going to discuss in this article. At the end you will understand why we use this range. Many of its advantages are the consequence of raising …

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