During the same time, the other slaves do the same and will clear the buffer. Slave 1 take a time to process his buffer. 2) All slave receives the request : the message Q01 are in each slave buffer. I changed MB_Init block with SM0.1 and also check everything you told me. 1) The master send a request to a specific slave 01 : Q01. Also functionality test of that converter can be made for sure, no luck without it's functionality! Sry, don't work with that Modscan SW so no help here about functionality. You can also set some Delay time for sure, make tests. In case you not send or recv and some LED on converter is permanently on, this is problem with swapped wires on 485 side, you need change them. Do you have LED indications on that RS-485 to RS-232 converter? In not SEND/RECV time, that LEDs can be off, only if PC application send requests or PLC responds, the exact LED will be on. As I've sugested, this init block can be executed only once, on first scan - SM0.1 bit enable this block, look to help. Look pls again to help about MB_Init block.
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