It seems like a simple question (I don’t know how to do it, so I’m asking for help from everyone)
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Question: When one silo was full, unloading began; unloading stopped after 9,450 tons had been unloaded. The material level changes, and it seems that ordinary function blocks cannot handle this. If there is anyone who can do it, please let me know (with detailed instructions). I’m using Siemens PCS7. Additional info: the element used for detection is a scale. Last edited by wopale3 on 2009-3-11 at 13:22
Additional note: The original sample for testing is weighed
The unloading process is controlled using SFC; comparison based on weight is used to trigger the execution of this control logic. Siemens PCS7 has a function block called DOSING that seems to be capable of achieving this purpose. You might want to check the relevant documentation – if it can be used, then there’s no need for SFC, as it’s quite complicated
Thank you to the person above; I’ve already finished it – I just need to add the pulse and selection blocks