Recent posts to How to access the value of a variable held in the previous cycle in ST?https://forge.codesys.com/forge/talk/Engineering/thread/2158b6f2cc/2021-09-01T15:50:01.226000ZRecent posts to How to access the value of a variable held in the previous cycle in ST?How to access the value of a variable held in the previous cycle in ST?2021-09-01T15:50:01.226000Z2021-09-01T15:50:01.226000Zsean-bartonhttps://forge.codesys.com/u/sean-barton/https://forge.codesys.com862b7c1f1a7672efaad1d8b2972602b7ec956695<div class="markdown_content"><p>Right, this is what I typically do to compare past and present values as well.</p></div>How to access the value of a variable held in the previous cycle in ST?2021-08-31T11:19:47.285000Z2021-08-31T11:19:47.285000Zi-campbellhttps://forge.codesys.com/u/i-campbell/https://forge.codesys.comc420794c1d72a7aa43f923a30fbed14cbc66616b<div class="markdown_content"><p>therr is no special command for this, you would need create a new variable called "previous_x" and do <br/>
previous_x := x;</p></div>How to access the value of a variable held in the previous cycle in ST?2021-08-31T10:17:44.635000Z2021-08-31T10:17:44.635000Zpcs-1282https://forge.codesys.com/u/pcs-1282/https://forge.codesys.com5c195d84c3402e0d499c523eb36638bc8c1ce7d4<div class="markdown_content"><p>Hi, pardon my ignorance, I am a bit new to this, but to compare the Old & New values, I would need to have access to them. My doubt is, for a particular variable, say X, how do I go about getting the value of X:Old (as in the value it held in the previous scan cycle)? Thank you!</p></div>How to access the value of a variable held in the previous cycle in ST?2021-08-31T09:14:47.195000Z2021-08-31T09:14:47.195000Zph0010421https://forge.codesys.com/u/ph0010421/https://forge.codesys.comdee80fbfc6713ef45d31d7f50ea48437e57c9fc4<div class="markdown_content"><p>Changed := Old <> New;<br/>
Old := New;</p></div>How to access the value of a variable held in the previous cycle in ST?2021-08-31T05:52:08.780000Z2021-08-31T05:52:08.780000Zpcs-1282https://forge.codesys.com/u/pcs-1282/https://forge.codesys.com516972440cbb17424b2281758a17ed782f96f9b1<div class="markdown_content"><p>Is it possible in CODESYS to access the value that a variable held in the previous cycle and compare it with it's present value? I am used to working with ABB's tool, which had the option of defining an attribute called <em>STATE</em> to a variable, which helps in accessing it's previous cycle value in the ST code. Thank you!</p></div>