this tutorial gives you step-by-step instructions on how to use schneider unity pro softplc to control factory i/o through modbus tcp/ip. press f4 to open the driver window. note that i/o points are already setup with 17 digital inputs (sensors), 13 digital outputs (actuators) adn 1 input register (number shown by the display: counter). read operations can be performed on coils or inputs according to settings chosen in the configuration panel. we are setting an offset of 17 to outputs in order to have the first 17 addresses available for coils (sensors). on this sample, digital input i/o points (sensors) are written to %m0 up to %m16, and digital outputs (actuators) are read from %m17 up to %m29. the project has been created and you are now ready to start writing the plc program.
these will be the variables used for sensor values. on the comment fields type in the name of the factory i/o points they represent so you can easily relate one to another. these will be the variables used for actuators. at last, create 1 int variable named counter0 (which is to be used by the counter display). for factory i/o to work together with unity pro you must assign memory values to internal variables. you must do the same for actuator variables by creating an outputs_fio_writing section and assigning the 13 actuators (%m17 up to %m29) and the counter0 variable to an int memory %mw. on the other hand, outputs_fio_writing should be placed last, so actuator values are assigned to memories after the program is executed. next, connect to the soft plc by clicking on plc > connect and download the program by clicking on plc > transfer project to plc.
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