Access Techniques - Siemens SIMATIC NET PROFIBUS Owner's Manual

PROFIBUS NETWORKS
1.2.2

Access Techniques

TOKEN BUS/Master-Slave Method
Network access on PROFIBUS corresponds to the method specified in EN 50170,
Volume 2 "Token Bus" for active and "Master-Slave" for passive stations.
Master
Slave
Master = active node
Slave = passive node
Figure 1-1
1-8
Master Master
Slave
Principle of the PROFIBUS Medium Access Technique
Token rotation
(logical ring)
Master
Master
Slave
Slave
Logical token ring
Master-slave relationship
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
Slave