Introduction to Industrial Automation

Figure 8.6  Communication collision in a network with carrier sense.

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  Introduction to Industrial Automation

the end of the transmission, passes the token to the next PLC in the sequence. Subsequently, the 

process is repeated cyclically along the logical ring, while the station that has the token is the only 

one that can transmit data on the bus. Finally, it should be noted that in industrial networks, the 

hybrid method of multiple master PLCs is commonly encountered, which combines the features 

of the token passing method on a bus and master/slave method.