https://forge.codesys.com/forge/talk/Engineering/thread/68fa79ca81/2021-10-23T12:16:23.393000ZRecent posts to Struct FB Input, type coercion2021-10-23T12:16:23.393000Z2021-10-23T12:16:23.393000Zsomlioyhttps://forge.codesys.com/u/somlioy/https://forge.codesys.com832309f08843a09e0367ff377e5bc8102c8b3f5a

<div class="markdown_content"><p>Hi</p> <p>I have 16 modbus slaves which have an idiotic modbus register layout, so I can't do 1 single query for several registers, but 1 query for each register I want.</p> <p>This means I have to do a lot of manual mapping on the function block for the devices, usually I have 2 variables per device like this, which are mapped to the modbus data:</p> <div class="codehilite"><pre><span></span><span class="err">VAR_INPUT </span> <span class="err"> awDataIn : ARRAY[0..20] OF WORD; </span> <span class="err">END_VAR</span> <span class="err">VAR_OUTPUT</span> <span class="err"> awDataOut : ARRAY[0..5] OF WORD;</span> <span class="err">END_VAR</span> </pre></div> <p>And the arrays are mapped internally in the function block.</p> <p>Since I cant do this with the stupid modbus slaves, I was thinking I could pass the modbus struct directly to the function block instead, however, each modbus device will have their own struct (typPump_1_tcp, typPump_2_tcp etc...), but with the same content. These structs are created automatically in e!cockpit by the modbus configurator.</p> <p>How can I have an "universal" input on my function block and do some sort of type coercion on the modbus structs?</p></div>