Case B
(option)
As soon as the actuator is switched off (motor voltage), the FO connection board of
this actuator is no longer available. As a consequence, communication with the
subsequent actuators is lost. To prevent this, the complete ACExC 01.2 can be
externally supplied with 24 V DC.
3.2
Star topology
Figure 8:
Structure for star topology
Max. FO cable range in km (observe technical data!)
[1]
FO PP-coupler within electrical connection of ACExC 01.2
[2]
LWL Stich-Koppler in der Leittechnik (zwingend erforderlich)
[3]
LWL Stich-Koppler für Beliebiges Profibus DP Feldgerät
[4]
Any Profibus DP field device
Table 3:
Number of FO devices (actuators) connected in series
Maximum number of FO devices
Baud rate [kbit/s]
36
9.6
36
19.2
36
45.45
36
93.75
18
187.5
9
500
4
1,500
Special features of star topology
Failure of an FO cable section or of an actuator's FO connection board has no impact
on the operability of the remaining actuators.
9
Network topologies
