When the contact screen is connected with the PLC, in fact, the memory of the PLC is used, (the contact screen also has a small amount of memory, which is only used to store system data, that is, the screen, controls, etc.), the contact screen and the PLC communication is generally a master/slave relationship, that is, the contact screen reads the data from the PLC, and the judgment is displayed after the judgment, the contact screen and the PLC communication is generally not a separate communication module, and the PLC generally reads and integrates the port of communication with the contact screen, but this depends on the type of contact screen and PLC, Specifically, after the contact screen and PLC type are selected, it can be solved by checking the echo materials
Communication between the touch screen and the PLC is not difficult. The main result of the connection between the contact screen and the PLC is that the hardware such as buttons and indicator lights are omitted. The PLC does not require any separate functional modules. You only need to make an internal button (middle bit M) on the PLC control program, and the contact button configured on the contact screen corresponds to the middle bit.
Connection method between PLC and contact screen:
Way:
The GP37W2 of Proface is connected to the programming port of the PLC
The PLC has added an FX1N-422BD module to connect the modules
Eview's MT4300L touch screen (both ports COM0COM1 are capable)
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