https://forge.codesys.com/forge/talk/Runtime/thread/b46f6f2b2a/2020-02-27T16:57:02.840000ZRecent posts to Two Master PLC Redundancy2020-02-27T16:57:02.840000Z2020-02-27T16:57:02.840000ZM4Automationhttps://forge.codesys.com/u/m4automation/https://forge.codesys.comb9f4bf2fc6cb85804d9270b47e59cd59534df2e9

<div class="markdown_content"><p>I have tried doing this with Modbus TCP, but i didn't a get satisfactory result.<br/> Modbus TCP communication is not the most reliable.<br/> I usally solve this by hardwireing a digital output from the primary master to an input on the secondary master.</p></div>

2020-02-27T16:57:00.067000Z2020-02-27T16:57:00.067000Zmurdemonhttps://forge.codesys.com/u/murdemon/https://forge.codesys.coma423cff71bad3fc9ee215ff02d22dad530138b1c

<div class="markdown_content"><p>Hello,</p> <p>Somebody have experience with it on Codesys V3. It is possible to do it with software PLC programm? (just send all time with tcp/ip Master image to Slave) and when master going down start Slave program from same state as Master was (working with Ethercat IO or Modbus TCP IO for example)?</p></div>