Search the Community

Showing results for tags 'union'.

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Found 3 results

  1. Union

    Hello! I am trying to get hold of the bits in a word, i have read that union is the way to go. My problem is that i cant figure out how union works. I have made a union between a word (16bit) and an array(0...15). The way I understood this was that the word now automaticly updates the array so that when the least significant bit in the word should update array[00] and so on. This is not happening. When I monitor the variables I can see the word change, but nothing happens with the array. Have I misunderstood the consept and what should I do to get hold of the bits?
  2. Hey all, I am having some issues with a Keyence IV2 camera which has Ethernet/IP functionality.  To summarize briefly, it has been configured and reading the data into my PLC (NJ501) into a structure data type.  The issue I'm having is that I cannot control this on a bit level for triggering the camera, etc.  I was reading that a Union type is the way to go, but unfortunately, I stopped getting data into the PLC when setting it up that way.  According to the configuration guide for Rockwell and setting it up in the Network Configurator, I needed to go with the SINT type.  When registering the device, the 8-bit option was necessary since the Input/Output sizes needed to match.  This was predetermined by the EDS file for the IV2. I am stumped as to how to get the data to read into the Union Type, and any suggestions would be greatly appreciated. Thanks, -K  
  3. I am having problem converting a DWORD variable to a floating point decimal.  I've tried using the DWORD_TO_REAL function. Having the hex value "41E9B814" as an input I was expecting to get "29.2148819" as an output. However, I'm getting "1.110194.." as the output. Any ideas?