External Moderators tmoulder Posted November 9, 2010 External Moderators Report Share Posted November 9, 2010 Vision 280, Visilogic 8.6.3, serial modbus with Trio 206x When I use NO and NC contacts on the RHR and PHR commands, it works. No errors in the status operand. When I use P and N transisiton bits, it doesn't. All error 5. I don't get it. At a ladder scan rate of 5mS, with a square wave being produced by SB7, logically, the one that works must be repeatedly sending 10 RHR and 10 PHR per seconds, pretty much non-stop. But if I use a pulse, to give a nice leisurely 50mS for the Trio to respond to each command, it reports that communication cannot be established. Whadaheck is going on? TM Quote Link to comment Share on other sites More sharing options...
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