How the PLC Device and HMI Touch Screen communicates !???

Abu-Abdullah

Hello Everybody

I am new member in this Great Forum

so, sorr if my thread is not in its right froum

I just need to ask about the processing of the signals (input&output) between the PLC Device & the HMI touch screen

I mean :

I need to know everything about the processing; such as :

how the HMI send the signal to the plc ( fixed or variable ) ?

how the signal will be understood to the PLC ?

how the PLC will recieve the signal from the HMI and understand it ?

how the PLC will send the indication signal to the HMI touch creen to show it ?

how the HMI will receive the indication signal which sent by PLC and how it will will be shown to us ?

.... etc

sorrybut I need the signal processing steps by details

and thanx a lot for your help and cooperation