Whether this fits comes down to what runs between your HMI and your PLC.
Send whatever you already know — feasibility is usually clear within an
email or two.
helpful to include
— HMI make and model
— PLC make and model
— How they are wired (RS-232 / RS-422 / RS-485 / Ethernet)
— Any known protocol or parameters (unknown is fine)
— What you want to see: output? utilisation? temperature? alarms?
— Number of machines, and whether brief downtime for installation is acceptable