title: What is cyclic and acyclic communication?
body: <p>So I've already searched if there was a question like this posted before, but I wasn't able to find the answer I liked.</p>
  
  <p>I've been working with some PLCs and variable frequency drives lately and thought it was about time I finally found out what cyclic and non-cyclic communication is.</p>
  
  <p>So correct me if I'm wrong, but when I think of cyclic data, I think of data that is continuously being updated and is able to be sent/sampled to other devices. With relation to what I'm doing, I'm thinking that the variable frequency drive is able to update information such as speed and frequency that can be sampled/read from a PLC. This is what I would consider cyclic communication, something that is always updating a certain type of information that can be sent as data. </p>
  
  <p>So I might be completely wrong with this assumption, and that leaves me with the question of what exactly would be considered non-cyclic or acyclic communication.</p>
  
  <p>Any help?</p>