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The Master must be able to recognize a communication interrupt, so he can react with a new general request. This is why no process commands will be executed until the Master has caused a reset.
Everytime there is a chance of data loss (value changes were lost), a reset will be triggered.
All commands will be rejected until the function code for reset (0) has been received. The code causes a reset in the link layer and the application layer.
When the connection is interrupted, the Master immediately reacts and restarts the initialization process. The reset will be caused if a Master connects.
By creating an IO of type C_RP_NA_1 with IOA 0, you can enable the control system to recognize received commands.
The value of the variable is set to '0' and then to the value of QRP.