6.2.2 BPD (Background Process Data Block):
Internal Data Base is a concept wherein the data for the registers mapped in the project is
fetched internally (or to say in the background) and the values are maintained internally by
the Master Drivers.
If background communication is enabled, master driver will use inputs from internal
database (IDB) and continuously start-fetching data for defined registers in IDB,
independent to other side driver. This data is stored in internal data memory. When request
comes from other end external master for mapped registers in gateway projects then data
is given from internal memory so time for data fetching from slave device is minimized.
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