https://forge.codesys.com/forge/talk/CODESYS-V2/thread/a3f61fbfad/2020-02-27T22:52:35.128000ZRecent posts to Modbus Memory Mapping2020-02-27T22:52:35.128000Z2020-02-27T22:52:35.128000Zshooterhttps://forge.codesys.com/u/shooter/https://forge.codesys.comdc39c17f46598c70596a2fcdc2b384d36a79b977

<div class="markdown_content"><p>Markers are not retained, only when you tell it in VAR RETAIN</p></div>

2020-02-27T22:52:33.521000Z2020-02-27T22:52:33.521000Zcpetzhttps://forge.codesys.com/u/cpetz/https://forge.codesys.comb28fcdc970186c4d00c3b908a1c9a8e436f7c42f

<div class="markdown_content"><p>What I would like to do is adjust part of the Modbus memory map without implementing additional Modbus.lib's. Basically, I want to utilize the Modbus address range from 12288-24575, but not actual have the memory stored on the WAGO NOVRAM. By default, that modbus address range is mapped to the Wago 16K 'retain flag' memory segment, starting with address %MW0. </p> <p>I have a 5,000 Word Array that I would like to be able to easily access via modbus, but this array will change frequently and will likely destroy the controller's NOVRAM quite fast.</p> <p>An alternative solution would be to adjust the starting point of the 'retain flag' segment without altering the current map of Modbus:12288 -&gt; Wago:%MW0.</p> <p>Another alternative solution would be to shrink the 'retain flag' segment, and start my array at an address of %MW1000 or similar. Although, I fear this solution will not work as expected.</p> <p>Any ways to do this using only configuration changes?</p> <p>Using Wago 750-880 PFC.</p></div>