milf os Posted August 18, 2011 Report Share Posted August 18, 2011 Hi I am trying to use the M91-ra22 as a modbus master and using i to poll a 3rd party device (ciat connect2 HVAC controller) I have set up the com port initialisation and the timed polling logic to access different sections of info on the connect2. This works fine if I'm not trying to access the M91 using the dbug function of U90. As soon as I do the connection to my laptop gets severed and I then have to reset the PLC in order to resume comms. The polling logic is user initiated and uses cascading timers (4 of) set at 2 seconds each. I am connecting to the PLC using a 232/485 converter to get onto the 485 bus. this works fine on its own. Any ideas how I can access the PLC and it still poll the 3rd party device simultaniously?? Quote Link to comment Share on other sites More sharing options...
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