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operating-systemplcrtos

Should HMI devices have RTOS on them?

I know that PLC devices must have RTOS such as VxWorks, but is the same true with HMI devices that connect with PLC?

Solution

  • This depends on the hardware of the HMI. PLCs use RTOSs for the compactness and guaranteed latency. Typical HMIs are delayed by user input and therefore, do not need the strict timing provided by an RTOS, unless the hardware is not capable of running a full OS.

    A full OS can communicate with a PLC.