![]() ![]() ![]() The most fundamental symbol of ladder logic programming is the Normally Open Contact or the Examine If Closed XIC Instruction. Normally Open (NO) Contact / Examine if Closed (XIC) In this tutorial, we will discuss each symbol, the functionality it brings to the ladder logic plc programming language as well as illustrate two examples where they may be used. They’re essential to know if you plan to do any work with this PLC programming language. Ladder Logic symbols are foundational elements that are memorized by every plc programmer. However, official documentation of the ladder logic symbols isn’t easy to digest and doesn’t provide concrete examples of each one. The standards of the language are well documented by the International Electromechanical Commission (IEC) in the exhibit 61131-3. ![]() Ladder Logic is one of the most common PLC programming languages. ![]()
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