normally open

EMR Contacts in Applications

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electro-mechanical contacts (EMC) in applications

This EMR Applications article was written by Chris Urban, an automation educator and PLC trainer with over 40 years of hands-on experience. Find Chris on YouTube and LinkedIn. — CU In the complex world of automation, reliability often boils down to a single, fundamental component: the electromechanical relay (EMR) contact. Whether you are troubleshooting a legacy system or … Read more

Relay Symbols and Abbreviations Glossary

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Do you really understand relays?

This article was written by Chris Urban, an automation educator and PLC trainer with over 40 years of hands-on experience. Find Chris on YouTube and LinkedIn. — CU This is the fourth article in the relay series. If you missed the previous one, start here:The Relay Obituary? Not So Fast! Before diving into how relay contacts are used in … Read more

Ladder Logic (NO) Contact – 3 Things to Know

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Ladder Logic Normally Open (NO) Contact - 3 Things to Know

Normally open (NO) contacts or inputs in the PLC ladder logic program do not mean the same as a wired normally open switch. NO contacts on the ladder logic provide the logic condition for the rung to turn on the output. We will be looking at three things about the normally open (NO) contact on … Read more