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M580 application triggers a HSBY command (swap/stop/run/application transfer), and this command is triggered with HMI application. What precautions are needed.

The commands coming from the HMI is received at the beginning of the MAST cycle, before the MAST application is  evaluated. Hence, the application may override the commands written by the HMI, and not be executed (if HMI requests the command and the PLC application forecs the bits to zero).
Therefore, the PLC application must not set the command bit to 0 (each cycle when it doesn't trigger the command)
It must evaluate the condition for the command ("if" statement) and set the bit to 1 if the condition is true.
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