Manual BG41/BG42/BG43 Interface building blocks
Rev. 99/49 2-1
2 Interface building blocks
2.1 Principle of data transmission
Data, which is written into the corresponding data channel from the PLC, is recorded by the
building block in the appropriate transmission buffer (256 Byte) and from there is sent through the
interface. In the other direction (Interface → PLC) the data received is recorded in the appropriate
receiving buffer and can be read by the PLC over the data channel.
back
plane
bus
Fig. 2-1:Data transfer via interface ( Example Module BG41)
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