External Moderators tmoulder Posted July 1, 2011 External Moderators Report Share Posted July 1, 2011 Greetings all, I've got a system with a V280 and 4 devices communicating over modbus TCP. Each requires a TCP connect, so each has it's own socket init, it's own IP Config block, it's own modbus busy bit. I'm trying to optimize the communication traffic pattern. In CanOpen, the PDOs are buffered, and comms are handled at the chip level. The socket arrangment in Modbus TCP seems to bear some resemblance to this. So here's a question: If I were to send a PHR message on all four sockets within the same ladder scan, what would happen? 1. The socket traffic is independent and buffered in OS/hardware, ala CanOpen. Concurrent messages are not an issue. 2. The first message gets through and the rest get dumped. 3. Strange behavior and error messages. 4. V280 screen displays "Self-Destruct Sequence Initiated". Evacuate immediately. Thanks, TM Quote Link to comment Share on other sites More sharing options...
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